targets/esp32: add .rxring and .wifibss sections to DRAM1

Place espradio's RX ring buffer and WiFi-only BSS (ISR tables, timer slots, ISR ring) in SRAM1 pool 7/6 ahead of the arena. Frees ~14 KB of SRAM2 for the Go GC heap. The arena assertion still guarantees ≥32 KB remains for WiFi DMA buffers. Signed-off-by: deadprogram <ron@hybridgroup.com>
runtime: prevent timer starvation in cores scheduler
2026-07-27 07:08:42 +00:00 · 2026-07-25 17:42:01 +02:00 · 2026-07-25 10:02:09 +02:00 · 2026-07-25 07:14:00 +02:00 · 2026-07-25 07:14:00 +02:00 · 2026-07-24 20:50:26 +02:00
916 changed files with 56711 additions and 15825 deletions
@@ -1,127 +0,0 @@
-version: 2.1
-
-commands:
-  submodules:
-    steps:
-      - run:
-          name: "Pull submodules"
-          command: git submodule update --init
-  llvm-source-linux:
-    steps:
-      - restore_cache:
-          keys:
-            - llvm-source-19-v1
-      - run:
-          name: "Fetch LLVM source"
-          command: make llvm-source
-      - save_cache:
-          key: llvm-source-19-v1
-          paths:
-            - llvm-project/clang/lib/Headers
-            - llvm-project/clang/include
-            - llvm-project/compiler-rt
-            - llvm-project/lld/include
-            - llvm-project/llvm/include
-  hack-ninja-jobs:
-    steps:
-      - run:
-          name: "Hack Ninja to use less jobs"
-          command: |
-            echo -e '#!/bin/sh\n/usr/bin/ninja -j3 "$@"' > /go/bin/ninja
-            chmod +x /go/bin/ninja
-  build-binaryen-linux:
-    steps:
-      - restore_cache:
-          keys:
-            - binaryen-linux-v3
-      - run:
-          name: "Build Binaryen"
-          command: |
-            make binaryen
-      - save_cache:
-          key: binaryen-linux-v3
-          paths:
-            - build/wasm-opt
-  test-linux:
-    parameters:
-      llvm:
-        type: string
-      fmt-check:
-        type: boolean
-        default: true
-    steps:
-      - checkout
-      - submodules
-      - run:
-          name: "Install apt dependencies"
-          command: |
-            echo 'deb https://apt.llvm.org/bullseye/ llvm-toolchain-bullseye-<<parameters.llvm>> main' > /etc/apt/sources.list.d/llvm.list
-            wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | apt-key add -
-            apt-get update
-            apt-get install --no-install-recommends -y \
-                llvm-<<parameters.llvm>>-dev \
-                clang-<<parameters.llvm>> \
-                libclang-<<parameters.llvm>>-dev \
-                lld-<<parameters.llvm>> \
-                cmake \
-                ninja-build
-      - hack-ninja-jobs
-      - build-binaryen-linux
-      - restore_cache:
-          keys:
-            - go-cache-v4-{{ checksum "go.mod" }}-{{ .Environment.CIRCLE_PREVIOUS_BUILD_NUM }}
-            - go-cache-v4-{{ checksum "go.mod" }}
-      - llvm-source-linux
-      - run: go install -tags=llvm<<parameters.llvm>> .
-      - restore_cache:
-          keys:
-            - wasi-libc-sysroot-systemclang-v7
-      - run: make wasi-libc
-      - save_cache:
-          key: wasi-libc-sysroot-systemclang-v7
-          paths:
-            - lib/wasi-libc/sysroot
-      - when:
-          condition: <<parameters.fmt-check>>
-          steps:
-          - run:
-              # Do this before gen-device so that it doesn't check the
-              # formatting of generated files.
-              name: Check Go code formatting
-              command: make fmt-check lint
-      - run: make gen-device -j4
-      # TODO: change this to -skip='TestErrors|TestWasm' with Go 1.20
-      - run: go test -tags=llvm<<parameters.llvm>> -short -run='TestBuild|TestTest|TestGetList|TestTraceback'
-      - run: make smoketest XTENSA=0
-      - save_cache:
-          key: go-cache-v4-{{ checksum "go.mod" }}-{{ .Environment.CIRCLE_BUILD_NUM }}
-          paths:
-            - ~/.cache/go-build
-            - /go/pkg/mod
-
-jobs:
-  test-llvm15-go119:
-    docker:
-      - image: golang:1.19-bullseye
-    steps:
-      - test-linux:
-          llvm: "15"
-          # "make lint" fails before go 1.21 because internal/tools/go.mod specifies packages that require go 1.21
-          fmt-check: false
-    resource_class: large
-  test-llvm19-go123:
-    docker:
-      - image: golang:1.23-bullseye
-    steps:
-      - test-linux:
-          llvm: "19"
-    resource_class: large
-
-workflows:
-  test-all:
-    jobs:
-      # This tests our lowest supported versions of Go and LLVM, to make sure at
-      # least the smoke tests still pass.
-      - test-llvm15-go119
-      # This tests LLVM 19 support when linking against system libraries.
-      - test-llvm19-go123
@@ -1,5 +1,4 @@
 build/
 llvm-*/
 .github
-.circleci

@@ -16,36 +16,37 @@ jobs:
    name: build-macos
    strategy:
      matrix:
-        # macos-13: amd64 (oldest supported version as of 18-10-2024)
-        # macos-14: arm64 (oldest arm64 version)
-        os: [macos-13, macos-14]
+        # macos-14: arm64 (oldest supported version as of 18-11-2025)
+        # macos-15-intel: amd64 (last intel version to be supported by github runners)
+        # See https://github.com/actions/runner-images/issues/13046
+        os: [macos-14, macos-15-intel]
        include:
-          - os: macos-13
-            goarch: amd64
          - os: macos-14
            goarch: arm64
+          - os: macos-15-intel
+            goarch: amd64
    runs-on: ${{ matrix.os }}
    steps:
      - name: Install Dependencies
        run: |
          HOMEBREW_NO_AUTO_UPDATE=1 brew install qemu binaryen
      - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
        with:
          submodules: true
      - name: Extract TinyGo version
        id: version
        run: ./.github/workflows/tinygo-extract-version.sh | tee -a "$GITHUB_OUTPUT"
      - name: Install Go
-        uses: actions/setup-go@v5
+        uses: actions/setup-go@v6
        with:
-          go-version: '1.23'
+          go-version: '1.27.0-rc.2'
          cache: true
      - name: Restore LLVM source cache
-        uses: actions/cache/restore@v4
+        uses: actions/cache/restore@v5
        id: cache-llvm-source
        with:
-          key: llvm-source-19-${{ matrix.os }}-v1
+          key: llvm-source-22-${{ matrix.os }}-v1
          path: |
            llvm-project/clang/lib/Headers
            llvm-project/clang/include
@@ -56,7 +57,7 @@ jobs:
        if: steps.cache-llvm-source.outputs.cache-hit != 'true'
        run: make llvm-source
      - name: Save LLVM source cache
-        uses: actions/cache/save@v4
+        uses: actions/cache/save@v5
        if: steps.cache-llvm-source.outputs.cache-hit != 'true'
        with:
          key: ${{ steps.cache-llvm-source.outputs.cache-primary-key }}
@@ -67,10 +68,10 @@ jobs:
            llvm-project/lld/include
            llvm-project/llvm/include
      - name: Restore LLVM build cache
-        uses: actions/cache/restore@v4
+        uses: actions/cache/restore@v5
        id: cache-llvm-build
        with:
-          key: llvm-build-19-${{ matrix.os }}-v1
+          key: llvm-build-22-${{ matrix.os }}-v1
          path: llvm-build
      - name: Build LLVM
        if: steps.cache-llvm-build.outputs.cache-hit != 'true'
@@ -79,29 +80,20 @@ jobs:
          rm -rf llvm-project
          make llvm-source
          # install dependencies
-          HOMEBREW_NO_AUTO_UPDATE=1 brew install cmake ninja
+          HOMEBREW_NO_AUTO_UPDATE=1 brew install ninja
          # build!
          make llvm-build
          find llvm-build -name CMakeFiles -prune -exec rm -r '{}' \;
      - name: Save LLVM build cache
-        uses: actions/cache/save@v4
+        uses: actions/cache/save@v5
        if: steps.cache-llvm-build.outputs.cache-hit != 'true'
        with:
          key: ${{ steps.cache-llvm-build.outputs.cache-primary-key }}
          path: llvm-build
-      - name: Cache wasi-libc sysroot
-        uses: actions/cache@v4
-        id: cache-wasi-libc
-        with:
-          key: wasi-libc-sysroot-${{ matrix.os }}-v1
-          path: lib/wasi-libc/sysroot
-      - name: Build wasi-libc
-        if: steps.cache-wasi-libc.outputs.cache-hit != 'true'
-        run: make wasi-libc
      - name: make gen-device
        run: make -j3 gen-device
      - name: Test TinyGo
-        run: make test GOTESTFLAGS="-short"
+        run: make test GOTESTFLAGS="-only-current-os"
      - name: Build TinyGo release tarball
        run: make release -j3
      - name: Test stdlib packages
@@ -109,16 +101,11 @@ jobs:
      - name: Make release artifact
        run: cp -p build/release.tar.gz build/tinygo${{ steps.version.outputs.version }}.darwin-${{ matrix.goarch }}.tar.gz
      - name: Publish release artifact
-        # Note: this release artifact is double-zipped, see:
-        # https://github.com/actions/upload-artifact/issues/39
-        # We can essentially pick one of these:
-        # - have a double-zipped artifact when downloaded from the UI
-        # - have a very slow artifact upload
-        # We're doing the former here, to keep artifact uploads fast.
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
        with:
          name: darwin-${{ matrix.goarch }}-double-zipped-${{ steps.version.outputs.version }}
          path: build/tinygo${{ steps.version.outputs.version }}.darwin-${{ matrix.goarch }}.tar.gz
+          archive: false
      - name: Smoke tests
        run: make smoketest TINYGO=$(PWD)/build/tinygo
  test-macos-homebrew:
@@ -126,10 +113,10 @@ jobs:
    runs-on: macos-latest
    strategy:
      matrix:
-        version: [16, 17, 18, 19]
+        version: [16, 17, 18, 19, 20]
    steps:
      - name: Set up Homebrew
-        uses: Homebrew/actions/setup-homebrew@master
+        uses: Homebrew/actions/setup-homebrew@main
      - name: Fix Python symlinks
        run: |
          # Github runners have broken symlinks, so relink
@@ -138,20 +125,21 @@ jobs:
      - name: Install LLVM
        run: |
          brew install llvm@${{ matrix.version }}
+          brew link llvm@${{ matrix.version }}
      - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
      - name: Install Go
-        uses: actions/setup-go@v5
+        uses: actions/setup-go@v6
        with:
-          go-version: '1.23'
+          go-version: '1.27.0-rc.2'
          cache: true
      - name: Build TinyGo (LLVM ${{ matrix.version }})
        run: go install -tags=llvm${{ matrix.version }}
      - name: Check binary
        run: tinygo version
      - name: Build TinyGo (default LLVM)
-        if: matrix.version == 19
+        if: matrix.version == 20
        run: go install
      - name: Check binary
-        if: matrix.version == 19
+        if: matrix.version == 20
        run: tinygo version
@@ -0,0 +1,72 @@
+# This CI job checks whether at least the smoke tests pass for the oldest
+# Go/LLVM version we claim to support.
+
+name: Version compatibility test
+
+on:
+  pull_request:
+  push:
+    branches:
+      - dev
+      - release
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  test-compat:
+    runs-on: ubuntu-22.04 # this must be a specific version for the apt install below
+    env:
+      # Oldest versions currently supported by TinyGo
+      LLVM: "15"
+      Go: "1.25" # when updating this, also update minorMin in builder/config.go
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v6
+        with:
+          submodules: true
+      - name: Install Go
+        uses: actions/setup-go@v6
+        with:
+          go-version: ${{ env.Go }}
+          cache: true
+      - name: Install LLVM
+        run: |
+          echo 'deb https://apt.llvm.org/jammy/ llvm-toolchain-jammy-${{ env.LLVM }} main' | sudo tee /etc/apt/sources.list.d/llvm.list
+          wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add -
+          sudo apt-get update
+          sudo apt-get install --no-install-recommends -y \
+              llvm-${{ env.LLVM }}-dev \
+              clang-${{ env.LLVM }} \
+              libclang-${{ env.LLVM }}-dev \
+              lld-${{ env.LLVM }} \
+              binaryen
+      - name: Restore LLVM source cache
+        uses: actions/cache/restore@v5
+        id: cache-llvm-source
+        with:
+          key: llvm-source-22-linux-compat
+          path: llvm-project/compiler-rt
+      - name: Download LLVM source
+        if: steps.cache-llvm-source.outputs.cache-hit != 'true'
+        run: make llvm-source
+      - name: Save LLVM source cache
+        uses: actions/cache/save@v5
+        if: steps.cache-llvm-source.outputs.cache-hit != 'true'
+        with:
+          key: ${{ steps.cache-llvm-source.outputs.cache-primary-key }}
+          path: llvm-project/compiler-rt
+      - name: Go cache
+        uses: actions/cache@v5
+        with:
+          path: |
+            ~/.cache/go-build
+            ~/go/pkg/mod
+          key: go-build-${{ env.Go }}-llvm${{ env.LLVM }}-${{ hashFiles('go.sum') }}
+      - name: Build TinyGo
+        run: go install -tags=llvm${{ env.LLVM }}
+      - run: tinygo version
+      - run: make gen-device -j4
+      - run: go test -tags=llvm${{ env.LLVM }} -short -skip=TestErrors
+      - run: make smoketest XTENSA=0
@@ -31,14 +31,14 @@ jobs:
          sudo rm -rf /usr/local/share/boost
          df -h
      - name: Check out the repo
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
        with:
          submodules: recursive
      - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
+        uses: docker/setup-buildx-action@v4
      - name: Docker meta
        id: meta
-        uses: docker/metadata-action@v5
+        uses: docker/metadata-action@v6
        with:
          images: |
            tinygo/tinygo-dev
@@ -47,18 +47,18 @@ jobs:
            type=sha,format=long
            type=raw,value=latest
      - name: Log in to Docker Hub
-        uses: docker/login-action@v3
+        uses: docker/login-action@v4
        with:
          username: ${{ secrets.DOCKER_HUB_USERNAME }}
          password: ${{ secrets.DOCKER_HUB_ACCESS_TOKEN }}
      - name: Log in to Github Container Registry
-        uses: docker/login-action@v3
+        uses: docker/login-action@v4
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}
      - name: Build and push
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v7
        with:
          context: .
          push: true
@@ -66,45 +66,3 @@ jobs:
          labels: ${{ steps.meta.outputs.labels }}
          cache-from: type=gha
          cache-to: type=gha,mode=max
-      - name: Trigger Drivers repo build on Github Actions
-        run: |
-          curl -X POST \
-          -H "Authorization: Bearer ${{secrets.GHA_ACCESS_TOKEN}}" \
-          -H "Accept: application/vnd.github.v3+json" \
-          https://api.github.com/repos/tinygo-org/drivers/actions/workflows/build.yml/dispatches \
-          -d '{"ref": "dev"}'
-      - name: Trigger Bluetooth repo build on Github Actions
-        run: |
-          curl -X POST \
-          -H "Authorization: Bearer ${{secrets.GHA_ACCESS_TOKEN}}" \
-          -H "Accept: application/vnd.github.v3+json" \
-          https://api.github.com/repos/tinygo-org/bluetooth/actions/workflows/linux.yml/dispatches \
-          -d '{"ref": "dev"}'
-      - name: Trigger TinyFS repo build on Github Actions
-        run: |
-          curl -X POST \
-          -H "Authorization: Bearer ${{secrets.GHA_ACCESS_TOKEN}}" \
-          -H "Accept: application/vnd.github.v3+json" \
-          https://api.github.com/repos/tinygo-org/tinyfs/actions/workflows/build.yml/dispatches \
-          -d '{"ref": "dev"}'
-      - name: Trigger TinyFont repo build on Github Actions
-        run: |
-          curl -X POST \
-          -H "Authorization: Bearer ${{secrets.GHA_ACCESS_TOKEN}}" \
-          -H "Accept: application/vnd.github.v3+json" \
-          https://api.github.com/repos/tinygo-org/tinyfont/actions/workflows/build.yml/dispatches \
-          -d '{"ref": "dev"}'
-      - name: Trigger TinyDraw repo build on Github Actions
-        run: |
-          curl -X POST \
-          -H "Authorization: Bearer ${{secrets.GHA_ACCESS_TOKEN}}" \
-          -H "Accept: application/vnd.github.v3+json" \
-          https://api.github.com/repos/tinygo-org/tinydraw/actions/workflows/build.yml/dispatches \
-          -d '{"ref": "dev"}'
-      - name: Trigger TinyTerm repo build on Github Actions
-        run: |
-          curl -X POST \
-          -H "Authorization: Bearer ${{secrets.GHA_ACCESS_TOKEN}}" \
-          -H "Accept: application/vnd.github.v3+json" \
-          https://api.github.com/repos/tinygo-org/tinyterm/actions/workflows/build.yml/dispatches \
-          -d '{"ref": "dev"}'
@@ -12,43 +12,61 @@ concurrency:
  cancel-in-progress: true

 jobs:
+  go-mod-tidy:
+    # Check that go.sum is up to date.
+    runs-on: ubuntu-slim
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v6
+        with:
+          submodules: true
+      - name: Install Go
+        uses: actions/setup-go@v6
+        with:
+          go-version: '1.27.0-rc.2'
+          cache: true
+      - name: Run go mod tidy
+        run: go mod tidy
+      - name: Check go.mod and go.sum are up to date
+        run: git diff --exit-code
+
  build-linux:
    # Build Linux binaries, ready for release.
    # This runs inside an Alpine Linux container so we can more easily create a
    # statically linked binary.
    runs-on: ubuntu-latest
    container:
-      image: golang:1.23-alpine
+      image: golang:1.27rc2-alpine
    outputs:
      version: ${{ steps.version.outputs.version }}
    steps:
      - name: Install apk dependencies
-        # tar: needed for actions/cache@v4
+        # tar: needed for actions/cache@v5
        # git+openssh: needed for checkout (I think?)
        # ruby: needed to install fpm
-        run: apk add tar git openssh make g++ ruby-dev
+        run: apk add tar git openssh make g++ ruby-dev mold
      - name: Work around CVE-2022-24765
        # We're not on a multi-user machine, so this is safe.
        run: git config --global --add safe.directory "$GITHUB_WORKSPACE"
      - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
        with:
          submodules: true
      - name: Extract TinyGo version
        id: version
        run: ./.github/workflows/tinygo-extract-version.sh | tee -a "$GITHUB_OUTPUT"
      - name: Cache Go
-        uses: actions/cache@v4
+        uses: actions/cache@v5
        with:
-          key: go-cache-linux-alpine-v1-${{ hashFiles('go.mod') }}
+          key: go-cache-linux-alpine-v2-${{ hashFiles('go.mod') }}
          path: |
            ~/.cache/go-build
            ~/go/pkg/mod
      - name: Restore LLVM source cache
-        uses: actions/cache/restore@v4
+        uses: actions/cache/restore@v5
        id: cache-llvm-source
        with:
-          key: llvm-source-19-linux-alpine-v1
+          key: llvm-source-22-linux-alpine-v1
          path: |
            llvm-project/clang/lib/Headers
            llvm-project/clang/include
@@ -59,7 +77,7 @@ jobs:
        if: steps.cache-llvm-source.outputs.cache-hit != 'true'
        run: make llvm-source
      - name: Save LLVM source cache
-        uses: actions/cache/save@v4
+        uses: actions/cache/save@v5
        if: steps.cache-llvm-source.outputs.cache-hit != 'true'
        with:
          key: ${{ steps.cache-llvm-source.outputs.cache-primary-key }}
@@ -70,10 +88,10 @@ jobs:
            llvm-project/lld/include
            llvm-project/llvm/include
      - name: Restore LLVM build cache
-        uses: actions/cache/restore@v4
+        uses: actions/cache/restore@v5
        id: cache-llvm-build
        with:
-          key: llvm-build-19-linux-alpine-v1
+          key: llvm-build-22-linux-alpine-v1
          path: llvm-build
      - name: Build LLVM
        if: steps.cache-llvm-build.outputs.cache-hit != 'true'
@@ -88,31 +106,22 @@ jobs:
          # Remove unnecessary object files (to reduce cache size).
          find llvm-build -name CMakeFiles -prune -exec rm -r '{}' \;
      - name: Save LLVM build cache
-        uses: actions/cache/save@v4
+        uses: actions/cache/save@v5
        if: steps.cache-llvm-build.outputs.cache-hit != 'true'
        with:
          key: ${{ steps.cache-llvm-build.outputs.cache-primary-key }}
          path: llvm-build
      - name: Cache Binaryen
-        uses: actions/cache@v4
+        uses: actions/cache@v5
        id: cache-binaryen
        with:
-          key: binaryen-linux-alpine-v1
+          key: binaryen-linux-alpine-v3
          path: build/wasm-opt
      - name: Build Binaryen
        if: steps.cache-binaryen.outputs.cache-hit != 'true'
        run: |
          apk add cmake samurai python3
          make binaryen STATIC=1
-      - name: Cache wasi-libc
-        uses: actions/cache@v4
-        id: cache-wasi-libc
-        with:
-          key: wasi-libc-sysroot-linux-alpine-v2
-          path: lib/wasi-libc/sysroot
-      - name: Build wasi-libc
-        if: steps.cache-wasi-libc.outputs.cache-hit != 'true'
-        run: make wasi-libc
      - name: Install fpm
        run: |
          gem install --version 4.0.7 public_suffix
@@ -127,37 +136,42 @@ jobs:
          make release deb -j3 STATIC=1
          cp -p build/release.tar.gz /tmp/tinygo${{ steps.version.outputs.version }}.linux-amd64.tar.gz
          cp -p build/release.deb    /tmp/tinygo_${{ steps.version.outputs.version }}_amd64.deb
-      - name: Publish release artifact
-        uses: actions/upload-artifact@v4
+      - name: "Publish release artifact: tarball"
+        uses: actions/upload-artifact@v7
        with:
-          name: linux-amd64-double-zipped-${{ steps.version.outputs.version }}
-          path: |
-            /tmp/tinygo${{ steps.version.outputs.version }}.linux-amd64.tar.gz
-            /tmp/tinygo_${{ steps.version.outputs.version }}_amd64.deb
+          name: tinygo${{ steps.version.outputs.version }}.linux-amd64.tar.gz
+          path: /tmp/tinygo${{ steps.version.outputs.version }}.linux-amd64.tar.gz
+          archive: false
+      - name: "Publish release artifact: Debian package"
+        uses: actions/upload-artifact@v7
+        with:
+          name: tinygo_${{ steps.version.outputs.version }}_amd64.deb
+          path: /tmp/tinygo_${{ steps.version.outputs.version }}_amd64.deb
+          archive: false
  test-linux-build:
    # Test the binaries built in the build-linux job by running the smoke tests.
    runs-on: ubuntu-latest
    needs: build-linux
    steps:
      - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
        with:
          submodules: true
      - name: Install Go
-        uses: actions/setup-go@v5
+        uses: actions/setup-go@v6
        with:
-          go-version: '1.23'
+          go-version: '1.27.0-rc.2'
          cache: true
      - name: Install wasmtime
        uses: bytecodealliance/actions/wasmtime/setup@v1
        with:
-          version: "19.0.1"
+          version: "29.0.1"
      - name: Install wasm-tools
        uses: bytecodealliance/actions/wasm-tools/setup@v1
      - name: Download release artifact
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v8
        with:
-          name: linux-amd64-double-zipped-${{ needs.build-linux.outputs.version }}
+          name: tinygo${{ needs.build-linux.outputs.version }}.linux-amd64.tar.gz
      - name: Extract release tarball
        run: |
          mkdir -p ~/lib
@@ -165,14 +179,15 @@ jobs:
          ln -s ~/lib/tinygo/bin/tinygo ~/go/bin/tinygo
      - run: make tinygo-test-wasip1-fast
      - run: make tinygo-test-wasip2-fast
+      - run: make tinygo-test-wasm
      - run: make smoketest
  assert-test-linux:
    # Run all tests that can run on Linux, with LLVM assertions enabled to catch
    # potential bugs.
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-latest
    steps:
      - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
        with:
          submodules: true
      - name: Install apt dependencies
@@ -187,25 +202,25 @@ jobs:
              simavr \
              ninja-build
      - name: Install Go
-        uses: actions/setup-go@v5
+        uses: actions/setup-go@v6
        with:
-          go-version: '1.23'
+          go-version: '1.27.0-rc.2'
          cache: true
      - name: Install Node.js
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v6
        with:
-          node-version: '18'
+          node-version: '22'
      - name: Install wasmtime
        uses: bytecodealliance/actions/wasmtime/setup@v1
        with:
-          version: "19.0.1"
+          version: "29.0.1"
      - name: Setup `wasm-tools`
        uses: bytecodealliance/actions/wasm-tools/setup@v1
      - name: Restore LLVM source cache
-        uses: actions/cache/restore@v4
+        uses: actions/cache/restore@v5
        id: cache-llvm-source
        with:
-          key: llvm-source-19-linux-asserts-v1
+          key: llvm-source-22-linux-asserts-v1
          path: |
            llvm-project/clang/lib/Headers
            llvm-project/clang/include
@@ -216,7 +231,7 @@ jobs:
        if: steps.cache-llvm-source.outputs.cache-hit != 'true'
        run: make llvm-source
      - name: Save LLVM source cache
-        uses: actions/cache/save@v4
+        uses: actions/cache/save@v5
        if: steps.cache-llvm-source.outputs.cache-hit != 'true'
        with:
          key: ${{ steps.cache-llvm-source.outputs.cache-primary-key }}
@@ -227,10 +242,10 @@ jobs:
            llvm-project/lld/include
            llvm-project/llvm/include
      - name: Restore LLVM build cache
-        uses: actions/cache/restore@v4
+        uses: actions/cache/restore@v5
        id: cache-llvm-build
        with:
-          key: llvm-build-19-linux-asserts-v1
+          key: llvm-build-22-linux-asserts-v1
          path: llvm-build
      - name: Build LLVM
        if: steps.cache-llvm-build.outputs.cache-hit != 'true'
@@ -243,13 +258,13 @@ jobs:
          # Remove unnecessary object files (to reduce cache size).
          find llvm-build -name CMakeFiles -prune -exec rm -r '{}' \;
      - name: Save LLVM build cache
-        uses: actions/cache/save@v4
+        uses: actions/cache/save@v5
        if: steps.cache-llvm-build.outputs.cache-hit != 'true'
        with:
          key: ${{ steps.cache-llvm-build.outputs.cache-primary-key }}
          path: llvm-build
      - name: Cache Binaryen
-        uses: actions/cache@v4
+        uses: actions/cache@v5
        id: cache-binaryen
        with:
          key: binaryen-linux-asserts-v1
@@ -257,15 +272,6 @@ jobs:
      - name: Build Binaryen
        if: steps.cache-binaryen.outputs.cache-hit != 'true'
        run: make binaryen
-      - name: Cache wasi-libc
-        uses: actions/cache@v4
-        id: cache-wasi-libc
-        with:
-          key: wasi-libc-sysroot-linux-asserts-v6
-          path: lib/wasi-libc/sysroot
-      - name: Build wasi-libc
-        if: steps.cache-wasi-libc.outputs.cache-hit != 'true'
-        run: make wasi-libc
      - run: make gen-device -j4
      - name: Test TinyGo
        run: make ASSERT=1 test
@@ -277,7 +283,9 @@ jobs:
        run: make tinygo-test
      - run: make smoketest
      - run: make wasmtest
-      - run: make tinygo-baremetal
+      - run: make tinygo-test-baremetal
+      - name: Check Go code formatting
+        run: make fmt-check lint
  build-linux-cross:
    # Build ARM Linux binaries, ready for release.
    # This intentionally uses an older Linux image, so that we compile against
@@ -297,11 +305,11 @@ jobs:
          - goarch: arm
            toolchain: arm-linux-gnueabihf
            libc: armhf
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04 # note: use the oldest image available! (see above)
    needs: build-linux
    steps:
      - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
      - name: Get TinyGo version
        id: version
        run: ./.github/workflows/tinygo-extract-version.sh | tee -a "$GITHUB_OUTPUT"
@@ -313,15 +321,15 @@ jobs:
              g++-${{ matrix.toolchain }} \
              libc6-dev-${{ matrix.libc }}-cross
      - name: Install Go
-        uses: actions/setup-go@v5
+        uses: actions/setup-go@v6
        with:
-          go-version: '1.23'
+          go-version: '1.27.0-rc.2'
          cache: true
      - name: Restore LLVM source cache
-        uses: actions/cache/restore@v4
+        uses: actions/cache/restore@v5
        id: cache-llvm-source
        with:
-          key: llvm-source-19-linux-v1
+          key: llvm-source-22-linux-v1
          path: |
            llvm-project/clang/lib/Headers
            llvm-project/clang/include
@@ -332,7 +340,7 @@ jobs:
        if: steps.cache-llvm-source.outputs.cache-hit != 'true'
        run: make llvm-source
      - name: Save LLVM source cache
-        uses: actions/cache/save@v4
+        uses: actions/cache/save@v5
        if: steps.cache-llvm-source.outputs.cache-hit != 'true'
        with:
          key: ${{ steps.cache-llvm-source.outputs.cache-primary-key }}
@@ -343,10 +351,10 @@ jobs:
            llvm-project/lld/include
            llvm-project/llvm/include
      - name: Restore LLVM build cache
-        uses: actions/cache/restore@v4
+        uses: actions/cache/restore@v5
        id: cache-llvm-build
        with:
-          key: llvm-build-19-linux-${{ matrix.goarch }}-v2
+          key: llvm-build-22-linux-${{ matrix.goarch }}-v1
          path: llvm-build
      - name: Build LLVM
        if: steps.cache-llvm-build.outputs.cache-hit != 'true'
@@ -361,16 +369,16 @@ jobs:
          # Remove unnecessary object files (to reduce cache size).
          find llvm-build -name CMakeFiles -prune -exec rm -r '{}' \;
      - name: Save LLVM build cache
-        uses: actions/cache/save@v4
+        uses: actions/cache/save@v5
        if: steps.cache-llvm-build.outputs.cache-hit != 'true'
        with:
          key: ${{ steps.cache-llvm-build.outputs.cache-primary-key }}
          path: llvm-build
      - name: Cache Binaryen
-        uses: actions/cache@v4
+        uses: actions/cache@v5
        id: cache-binaryen
        with:
-          key: binaryen-linux-${{ matrix.goarch }}-v4
+          key: binaryen-linux-${{ matrix.goarch }}-v5
          path: build/wasm-opt
      - name: Build Binaryen
        if: steps.cache-binaryen.outputs.cache-hit != 'true'
@@ -387,9 +395,9 @@ jobs:
        run: |
          make CROSS=${{ matrix.toolchain }}
      - name: Download amd64 release
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v8
        with:
-          name: linux-amd64-double-zipped-${{ needs.build-linux.outputs.version }}
+          name: tinygo${{ needs.build-linux.outputs.version }}.linux-amd64.tar.gz
      - name: Extract amd64 release
        run: |
          mkdir -p build/release
@@ -401,12 +409,17 @@ jobs:
      - name: Create ${{ matrix.goarch }} release
        run: |
          make release deb RELEASEONLY=1 DEB_ARCH=${{ matrix.libc }}
-          cp -p build/release.tar.gz /tmp/tinygo${{ steps.version.outputs.version }}.linux-${{ matrix.goarch }}.tar.gz
-          cp -p build/release.deb    /tmp/tinygo_${{ steps.version.outputs.version }}_${{ matrix.libc }}.deb
-      - name: Publish release artifact
-        uses: actions/upload-artifact@v4
+          cp -p build/release.tar.gz /tmp/tinygo${{ needs.build-linux.outputs.version }}.linux-${{ matrix.goarch }}.tar.gz
+          cp -p build/release.deb    /tmp/tinygo_${{ needs.build-linux.outputs.version }}_${{ matrix.libc }}.deb
+      - name: "Publish release artifact: tarball"
+        uses: actions/upload-artifact@v7
        with:
-          name: linux-${{ matrix.goarch }}-double-zipped-${{ steps.version.outputs.version }}
-          path: |
-            /tmp/tinygo${{ steps.version.outputs.version }}.linux-${{ matrix.goarch }}.tar.gz
-            /tmp/tinygo_${{ steps.version.outputs.version }}_${{ matrix.libc }}.deb
+          name: linux-${{ matrix.goarch }}-double-zipped-${{ needs.build-linux.outputs.version }}
+          path: /tmp/tinygo${{ needs.build-linux.outputs.version }}.linux-${{ matrix.goarch }}.tar.gz
+          archive: false
+      - name: "Publish release artifact: Debian package"
+        uses: actions/upload-artifact@v7
+        with:
+          name: linux-${{ matrix.goarch }}-double-zipped-${{ needs.build-linux.outputs.version }}
+          path: /tmp/tinygo_${{ needs.build-linux.outputs.version }}_${{ matrix.libc }}.deb
+          archive: false
@@ -25,18 +25,18 @@ jobs:
      contents: read
    steps:
      - name: Check out the repo
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
        with:
          submodules: recursive
      - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
+        uses: docker/setup-buildx-action@v4
      - name: Docker meta
        id: meta
-        uses: docker/metadata-action@v5
+        uses: docker/metadata-action@v6
        with:
          images: |
-            tinygo/llvm-19
-            ghcr.io/${{ github.repository_owner }}/llvm-19
+            tinygo/llvm-20
+            ghcr.io/${{ github.repository_owner }}/llvm-20
          tags: |
            type=sha,format=long
            type=raw,value=latest
@@ -46,13 +46,13 @@ jobs:
          username: ${{ secrets.DOCKER_HUB_USERNAME }}
          password: ${{ secrets.DOCKER_HUB_ACCESS_TOKEN }}
      - name: Log in to Github Container Registry
-        uses: docker/login-action@v3
+        uses: docker/login-action@v4
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}
      - name: Build and push
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v7
        with:
          target: tinygo-llvm-build
          context: .
@@ -21,28 +21,28 @@ jobs:
        # See: https://github.com/tinygo-org/tinygo/pull/4516#issuecomment-2416363668
        run: sudo apt-get remove llvm-18
      - name: Checkout
-        uses: actions/checkout@v4
-      - name: Pull musl
+        uses: actions/checkout@v6
+      - name: Pull musl, bdwgc
        run: |
-            git submodule update --init lib/musl
+            git submodule update --init lib/musl lib/bdwgc
      - name: Restore LLVM source cache
-        uses: actions/cache/restore@v4
+        uses: actions/cache/restore@v5
        id: cache-llvm-source
        with:
-          key: llvm-source-19-linux-nix-v1
+          key: llvm-source-22-linux-nix-v1
          path: |
            llvm-project/compiler-rt
      - name: Download LLVM source
        if: steps.cache-llvm-source.outputs.cache-hit != 'true'
        run: make llvm-source
      - name: Save LLVM source cache
-        uses: actions/cache/save@v4
+        uses: actions/cache/save@v5
        if: steps.cache-llvm-source.outputs.cache-hit != 'true'
        with:
          key: ${{ steps.cache-llvm-source.outputs.cache-primary-key }}
          path: |
            llvm-project/compiler-rt
-      - uses: cachix/install-nix-action@v22
+      - uses: cachix/install-nix-action@v31
      - name: Test
        run: |
          nix develop --ignore-environment --keep HOME --command bash -c "go install && ~/go/bin/tinygo version && ~/go/bin/tinygo build -o test ./testdata/cgo"
@@ -2,11 +2,11 @@
 # still works after checking out the dev branch (that is, when going from LLVM
 # 16 to LLVM 17 for example, both Clang 16 and Clang 17 are installed).

-echo 'deb https://apt.llvm.org/noble/ llvm-toolchain-noble-19 main' | sudo tee /etc/apt/sources.list.d/llvm.list
+echo 'deb https://apt.llvm.org/noble/ llvm-toolchain-noble-20 main' | sudo tee /etc/apt/sources.list.d/llvm.list
 wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add -
 sudo apt-get update
 sudo apt-get install --no-install-recommends -y \
-    llvm-19-dev \
-    clang-19 \
-    libclang-19-dev \
-    lld-19
+    llvm-20-dev \
+    clang-20 \
+    libclang-20-dev \
+    lld-20
@@ -19,25 +19,29 @@ jobs:
      - name: Add GOBIN to $PATH
        run: |
          echo "$HOME/go/bin" >> $GITHUB_PATH
+      - name: Install Go
+        uses: actions/setup-go@v6
+        with:
+          go-version: '~1.25'
      - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
        with:
          fetch-depth: 0 # fetch all history (no sparse checkout)
          submodules: true
      - name: Install apt dependencies
        run: ./.github/workflows/sizediff-install-pkgs.sh
      - name: Restore LLVM source cache
-        uses: actions/cache@v4
+        uses: actions/cache@v5
        id: cache-llvm-source
        with:
-          key: llvm-source-19-sizediff-v1
+          key: llvm-source-22-sizediff-v1
          path: |
            llvm-project/compiler-rt
      - name: Download LLVM source
        if: steps.cache-llvm-source.outputs.cache-hit != 'true'
        run: make llvm-source
      - name: Cache Go
-        uses: actions/cache@v4
+        uses: actions/cache@v5
        with:
          key: go-cache-linux-sizediff-v2-${{ hashFiles('go.mod') }}
          path: |
@@ -17,21 +17,14 @@ jobs:
    outputs:
      version: ${{ steps.version.outputs.version }}
    steps:
-      - name: Configure pagefile
-        uses: al-cheb/configure-pagefile-action@v1.4
-        with:
-          minimum-size: 8GB
-          maximum-size: 24GB
-          disk-root: "C:"
-      - uses: brechtm/setup-scoop@v2
-        with:
-          scoop_update: 'false'
+      - uses: MinoruSekine/setup-scoop@v4
      - name: Install Dependencies
        shell: bash
        run: |
+          scoop config use_external_7zip true
          scoop install ninja binaryen
      - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
        with:
          submodules: true
      - name: Extract TinyGo version
@@ -39,15 +32,15 @@ jobs:
        shell: bash
        run: ./.github/workflows/tinygo-extract-version.sh | tee -a "$GITHUB_OUTPUT"
      - name: Install Go
-        uses: actions/setup-go@v5
+        uses: actions/setup-go@v6
        with:
-          go-version: '1.23'
+          go-version: '1.27.0-rc.2'
          cache: true
      - name: Restore cached LLVM source
-        uses: actions/cache/restore@v4
+        uses: actions/cache/restore@v5
        id: cache-llvm-source
        with:
-          key: llvm-source-19-windows-v1
+          key: llvm-source-22-windows-v3
          path: |
            llvm-project/clang/lib/Headers
            llvm-project/clang/include
@@ -58,7 +51,7 @@ jobs:
        if: steps.cache-llvm-source.outputs.cache-hit != 'true'
        run: make llvm-source
      - name: Save cached LLVM source
-        uses: actions/cache/save@v4
+        uses: actions/cache/save@v5
        if: steps.cache-llvm-source.outputs.cache-hit != 'true'
        with:
          key: ${{ steps.cache-llvm-source.outputs.cache-primary-key }}
@@ -69,10 +62,10 @@ jobs:
            llvm-project/lld/include
            llvm-project/llvm/include
      - name: Restore cached LLVM build
-        uses: actions/cache/restore@v4
+        uses: actions/cache/restore@v5
        id: cache-llvm-build
        with:
-          key: llvm-build-19-windows-v1
+          key: llvm-build-22-windows-v1
          path: llvm-build
      - name: Build LLVM
        if: steps.cache-llvm-build.outputs.cache-hit != 'true'
@@ -86,35 +79,27 @@ jobs:
          # Remove unnecessary object files (to reduce cache size).
          find llvm-build -name CMakeFiles -prune -exec rm -r '{}' \;
      - name: Save cached LLVM build
-        uses: actions/cache/save@v4
+        uses: actions/cache/save@v5
        if: steps.cache-llvm-build.outputs.cache-hit != 'true'
        with:
          key: ${{ steps.cache-llvm-build.outputs.cache-primary-key }}
          path: llvm-build
-      - name: Cache wasi-libc sysroot
-        uses: actions/cache@v4
-        id: cache-wasi-libc
-        with:
-          key: wasi-libc-sysroot-v5
-          path: lib/wasi-libc/sysroot
-      - name: Build wasi-libc
-        if: steps.cache-wasi-libc.outputs.cache-hit != 'true'
-        run: make wasi-libc
      - name: Cache Go cache
-        uses: actions/cache@v4
+        uses: actions/cache@v5
        with:
-          key: go-cache-windows-v1-${{ hashFiles('go.mod') }}
+          key: go-cache-windows-v3-${{ hashFiles('go.mod') }}
          path: |
            C:/Users/runneradmin/AppData/Local/go-build
            C:/Users/runneradmin/go/pkg/mod
      - name: Install wasmtime
        run: |
-          scoop install wasmtime@14.0.4
+          scoop config use_external_7zip true
+          scoop install wasmtime@29.0.1
      - name: make gen-device
        run: make -j3 gen-device
      - name: Test TinyGo
        shell: bash
-        run: make test GOTESTFLAGS="-short"
+        run: make test GOTESTFLAGS="-only-current-os"
      - name: Build TinyGo release tarball
        shell: bash
        run: make build/release -j4
@@ -123,50 +108,35 @@ jobs:
        working-directory: build/release
        run: 7z -tzip a tinygo${{ steps.version.outputs.version }}.windows-amd64.zip tinygo
      - name: Publish release artifact
-        # Note: this release artifact is double-zipped, see:
-        # https://github.com/actions/upload-artifact/issues/39
-        # We can essentially pick one of these:
-        # - have a dobule-zipped artifact when downloaded from the UI
-        # - have a very slow artifact upload
-        # We're doing the former here, to keep artifact uploads fast.
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
        with:
-          name: windows-amd64-double-zipped-${{ steps.version.outputs.version }}
+          name: tinygo${{ steps.version.outputs.version }}.windows-amd64.zip
          path: build/release/tinygo${{ steps.version.outputs.version }}.windows-amd64.zip
+          archive: false

  smoke-test-windows:
    runs-on: windows-2022
    needs: build-windows
    steps:
-      - name: Configure pagefile
-        uses: al-cheb/configure-pagefile-action@v1.4
-        with:
-          minimum-size: 8GB
-          maximum-size: 24GB
-          disk-root: "C:"
-      - uses: brechtm/setup-scoop@v2
-        with:
-          scoop_update: 'false'
+      - uses: MinoruSekine/setup-scoop@v4
      - name: Install Dependencies
        shell: bash
        run: |
+          scoop config use_external_7zip true
          scoop install binaryen
      - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
      - name: Install Go
-        uses: actions/setup-go@v5
+        uses: actions/setup-go@v6
        with:
-          go-version: '1.23'
+          go-version: '1.27.0-rc.2'
          cache: true
      - name: Download TinyGo build
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v8
        with:
-          name: windows-amd64-double-zipped-${{ needs.build-windows.outputs.version }}
+          name: tinygo${{ needs.build-windows.outputs.version }}.windows-amd64.zip
          path: build/
-      - name: Unzip TinyGo build
-        shell: bash
-        working-directory: build
-        run: 7z x tinygo*.windows-amd64.zip -r
+        # This build is already unzipped.
      - name: Smoke tests
        shell: bash
        run: make smoketest TINYGO=$(PWD)/build/tinygo/bin/tinygo
@@ -175,28 +145,19 @@ jobs:
    runs-on: windows-2022
    needs: build-windows
    steps:
-      - name: Configure pagefile
-        uses: al-cheb/configure-pagefile-action@v1.4
-        with:
-          minimum-size: 8GB
-          maximum-size: 24GB
-          disk-root: "C:"
      - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
      - name: Install Go
-        uses: actions/setup-go@v5
+        uses: actions/setup-go@v6
        with:
-          go-version: '1.23'
+          go-version: '1.27.0-rc.2'
          cache: true
      - name: Download TinyGo build
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v8
        with:
-          name: windows-amd64-double-zipped-${{ needs.build-windows.outputs.version }}
+          name: tinygo${{ needs.build-windows.outputs.version }}.windows-amd64.zip
          path: build/
-      - name: Unzip TinyGo build
-        shell: bash
-        working-directory: build
-        run: 7z x tinygo*.windows-amd64.zip -r
+        # This build is already unzipped.
      - name: Test stdlib packages
        run: make tinygo-test TINYGO=$(PWD)/build/tinygo/bin/tinygo

@@ -204,34 +165,24 @@ jobs:
    runs-on: windows-2022
    needs: build-windows
    steps:
-      - name: Configure pagefile
-        uses: al-cheb/configure-pagefile-action@v1.4
-        with:
-          minimum-size: 8GB
-          maximum-size: 24GB
-          disk-root: "C:"
-      - uses: brechtm/setup-scoop@v2
-        with:
-          scoop_update: 'false'
+      - uses: MinoruSekine/setup-scoop@v4
      - name: Install Dependencies
        shell: bash
        run: |
-          scoop install binaryen && scoop install wasmtime@14.0.4
+          scoop config use_external_7zip true
+          scoop install binaryen wasmtime@29.0.1
      - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
      - name: Install Go
-        uses: actions/setup-go@v5
+        uses: actions/setup-go@v6
        with:
-          go-version: '1.23'
+          go-version: '1.27.0-rc.2'
          cache: true
      - name: Download TinyGo build
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v8
        with:
-          name: windows-amd64-double-zipped-${{ needs.build-windows.outputs.version }}
+          name: tinygo${{ needs.build-windows.outputs.version }}.windows-amd64.zip
          path: build/
-      - name: Unzip TinyGo build
-        shell: bash
-        working-directory: build
-        run: 7z x tinygo*.windows-amd64.zip -r
+        # This build is already unzipped.
      - name: Test stdlib packages on wasip1
        run: make tinygo-test-wasip1-fast TINYGO=$(PWD)/build/tinygo/bin/tinygo
@@ -16,13 +16,13 @@
 	url = https://github.com/WebAssembly/wasi-libc
 [submodule "lib/picolibc"]
 	path = lib/picolibc
-	url = https://github.com/keith-packard/picolibc.git
+	url = https://github.com/picolibc/picolibc.git
 [submodule "lib/stm32-svd"]
 	path = lib/stm32-svd
 	url = https://github.com/tinygo-org/stm32-svd
 [submodule "lib/musl"]
 	path = lib/musl
-	url = git://git.musl-libc.org/musl
+	url = https://github.com/tinygo-org/musl-libc.git
 [submodule "lib/binaryen"]
 	path = lib/binaryen
 	url = https://github.com/WebAssembly/binaryen.git
@@ -35,7 +35,9 @@
 [submodule "src/net"]
 	path = src/net
 	url = https://github.com/tinygo-org/net.git
-	branch = dev
 [submodule "lib/wasi-cli"]
 	path = lib/wasi-cli
 	url = https://github.com/WebAssembly/wasi-cli
+[submodule "lib/bdwgc"]
+	path = lib/bdwgc
+	url = https://github.com/ivmai/bdwgc.git
@@ -85,11 +85,17 @@ Try running TinyGo:

    ./build/tinygo help

-Also, make sure the `tinygo` binary really is statically linked. Check this
-using `ldd` (not to be confused with `lld`):
+Also, make sure the `tinygo` binary really is statically linked. The command to check for 
+dynamic dependencies differs depending on your operating system.
+
+On Linux, use `ldd` (not to be confused with `lld`):

    ldd ./build/tinygo

+On macOS, use otool -L:
+
+    otool -L ./build/tinygo
+
 The result should not contain libclang or libLLVM.

 ## Make a release tarball
@@ -1,3 +1,530 @@
+0.41.1
+---
+* **machine**
+  - esp32c3: correct pin interrupt setup call that was overlooked from #5320
+* **runtime**
+  - esp32s3: wait for TIMG0 update register to clear before reading timer registers
+* **net**
+  - update net module to a version that is backwards compatible with Go 1.25.x to fix #5332
+
+0.41.0
+---
+* **general**
+  - go.mod, compiler: bump minimum Go version to 1.23
+  - builder: support Go 1.26 now
+  - feat: add inheritable-only field to filter processor-level targets (#5270)
+  - feature: add esp32flash flash method for esp32s3/esp32c3/esp32/esp8266
+  - flashing: introduce flash method 'esp32jtag' for esp32c3/esp32s3 targets
+  - fashing: add "adb" flash method using Android Debug Bridge
+  - main: auto-use best available flashing options on esp32
+  - espflasher: update to espflasher 0.6.0
+* **compiler**
+  - implement method-set based AssignableTo and Implements (#5304)
+  - simplify createObjectLayout
+  - implement copy directly
+  - fix min/max on floats by using intrinsics
+  - add element layout to sliceAppend
+  - add intrinsic for crypto/internal/constanttime.boolToUint8
+  - fix SyscallN handling for Windows on Go 1.26+
+* **core**
+  - reflect: add TypeAssert
+  - reflect: fix TypeAssert for structs
+  - sync: add WaitGroup.Go
+  - os: add UserCacheDir and UserConfigDir
+  - os: implement Lchown function for changing file ownership (#5161)
+  - testing: add b.ReportMetric()
+  - errors: add errors package to passing list
+  - internal/gclayout: use correct lengths
+  - internal/abi: add EscapeNonString, EscapeToResultNonString
+  - internal, runtime: add internal fips bool
+  - internal/itoa: resurrect from Go stdlib
+  - internal/syscall/unix: implement GetRandom for WASI targets
+  - interp: make ptrtoint size mismatch a recoverable error
+  - loader: support "all:" prefix in //go:embed patterns
+  - loader, crypto/internal/entropy: fix 32 MiB RAM overflow on microcontrollers
+  - loader, unicode/utf8: fix hiBits overflow on 16-bit AVR targets
+  - builder: order embedded files deterministically
+  - builder: fix panic in findPackagePath when using -size short
+  - builder: fix SIGSEGV when stripping duplicate function definitions
+  - builder, runtime: fix duplicate symbol error with Go 1.26+ on Windows
+  - builder: use target-specific -march for RISC-V library compilation
+  - transform: modify output format from the -print-allocs flag to match the go coverage tool format
+  - cgo: allow for changes to 'short-enums' flag
+  - wasm: add more stubbed file operations
+* **machine**
+  - esp32c3: implement BlockDevice for esp32c3 flash
+  - esp32c3: clear GPIO STATUS before dispatching pin callbacks
+  - esp32c3: implement USBDevice using interrupts
+  - esp32c3: add Enable stub for QEMU test target
+  - esp32c3: fix interrupt disable handling
+  - esp32c3: clear MCAUSE after handling interrupt
+  - esp32c3: map missing IRAM sections in linker script
+  - esp32c3: fix to use PROVIDE() for WiFi/BLE ROM function addresses to allow blob overrides
+  - esp32c3: add WiFi/BLE ROM linker support
+  - esp32c3: use TIMG0 alarm interrupt for sleepTicks instead of busy-waiting
+  - esp32s3: implement Pin.SetInterrupt for GPIO pin change interrupts
+  - esp32s3: use edge-triggered CPU interrupt for GPIO pin interrupts
+  - esp32s3: add interrupt support (#5244)
+  - esp32s3: switch USB implementation to use interrupts instead of polling
+  - esp32s3: replace inline ISR with full interrupt vector handler
+  - esp32s3: use TIMG0 alarm interrupt for sleepTicks
+  - esp32s3: improve exception handlers, add procPin/procUnpin, and linker wrap flags
+  - esp32s3: fix Xtensa register window spill using recursive call4 in task switching
+  - esp32s3: update linker script and boot assembly for multi-page flash XIP mapping
+  - esp32s3: add flash XIP boot assembly with cache/MMU init
+  - esp32s3: implement SPI (#5169)
+  - esp32s3: implement I2C interface (#5210)
+  - esp32s3: implement RNG based on onboard hardware random number generator
+  - esp32s3,esp32c3: add USB serial support
+  - esp32s3,esp32c3: add txStalled flag to skip USB serial spin when no host
+  - esp32s3,esp32c3: make USB Serial/JTAG writes non-blocking when FIFO is full
+  - esp32c3/esp32s3: refactor ADC implementation to reduce code duplication
+  - esp32s3,esp32c3: add ADC support (#5231)
+  - esp32s3,esp32c3: add PWM support (#5215)
+  - esp32c3/esp32s3: refactoring and corrections for SPI implementation
+  - esp32xx: add WASM simulator support for ESP32-C3/ESP32-S3 targets
+  - esp32: default SPI CS pin to NoPin when unset
+  - esp: fix tinygo_scanCurrentStack to spill register windows
+  - stm32: fix UART interrupt storm caused by uncleared overrun error
+  - stm32: fix PWM problem due to register shifting
+  - stm32: add STM32U585 target definition and runtime
+  - stm32: add STM32U5 GPIO, pin interrupts, and UART support
+  - stm32: add STM32U5 I2C support
+  - stm32: add STM32U5 SPI support
+  - stm32u585: implement ADC
+  - stm32g0b1: add support (#5150)
+  - stm32g0b1: add Watchdog + ADC support (#5158)
+  - stm32l0: add flash support
+  - stm32l0x1,l0x2: TIM: adapt to 32-bit register access
+  - stm32g0: sync with updated stm32 device files
+  - attiny85: add USI-based SPI support (#5181)
+  - attiny85: add PWM support (#5171)
+  - rp: add Close function to UART to allow for removing all system resources/power usage
+  - rp: use blockReset() and unresetBlockWait() helper functions for peripheral reset/unreset
+  - rp2: prevent PWM Period method overflow
+  - rp2: add per-byte timeout budget for I2C (#5189)
+  - feather-m0: export UART0 and pins
+  - usb/cdc: better ring buffer implementation (#5209)
+  - fix: replace ! with ~ for register mask
+  - atmega328p_simulator: add correct build tag for arduino_uno after renaming
+* **net**
+  - update to Go 1.26.2 net package with UDP and JS improvements
+* **runtime**
+  - implement fminimum/fmaximum
+  - make timeoffset atomic
+  - add MemStats.HeapObjects
+  - handle GODEBUG on wasip2 (#5312)
+  - fix Darwin syscall return value truncation and lost arguments
+  - add syscall.runtimeClearenv for Go 1.26
+  - split syscall functions for darwin changes for 1.26
+  - fix: init heap before random number seed on wasm platforms
+* **targets**
+  - add esp32s3-supermini board target
+  - add support for Seeedstudio Xiao-RP2350 board
+  - add Shrike Lite board (#5170)
+  - rename arduino target to arduino-uno
+  - add pins/setup for Arduino UNO Q board QWIIC connector
+  - correct pin mapping for Arduino UNO Q STM32 MCU
+  - add stm32u585 openocd commands for flashing on Arduino UNO Q
+  - correct name/tag use for esp32s3-wroom1 board
+  - modify esp32, esp32s3, esp32c3, & esp8266 targets to use built-in esp32flash
+  - switch rp2040/rp2350 to default to tasks scheduler
+  - change default stack size for esp32c3 and esp32s3 to 8196
+  - swan: rename group build tag stm32l4x5 => stm32l4y5 to avoid clash with stm32 device name
+  - nucleo-f722ze: add build-tag stm32f722
+  - fix: set stm32u5x clock rate to default
+  - create generic targets for esp32 boards
+* **libs**
+  - stm32-svd: update submodule
+  - update tools/gen-device-svd for recent changes to stm32-svd file structure (#5212)
+* **build/test**
+  - build: use Golang 1.26 for all builds
+  - build: actually use the version of llvm we are supposed to be testing by using brew link command
+  - build: let scoop run updates to resolve binaryen install failures on Windows
+  - ci: don't double zip release artifacts
+  - test: increase default timeout from 1 to 2 minutes to prevent spurious CI fails
+  - testdata: fix flaky timers test by draining ticker channel after Stop
+  - testdata: more corpus entries (#5182)
+  - add soypat/lneto to corpus
+  - GNUmakefile: add context and expvar to stdlib tests
+  - GNUmakefile: add encoding/xml to stdlib tests on Linux
+  - main (test): skip mipsle test if the emulator is missing
+  - make: remove machine without board from smoketest
+  - stm32: add Arduino UNO Q to smoketests
+  - flake: bump to nixpkgs 25.11
+  - chore: update all github actions to latest versions
+  - fix: use external 7zip for scoop installs on Windows
+
+0.40.1
+---
+* **machine**
+  - nrf: fix flash writes when SoftDevice is enabled
+* **runtime**
+  - runtime: avoid fixed math/rand sequence on RP2040/RP2350 (#5124)
+  - runtime: add calls to initRand() during run() for all schedulers
+  - runtime: call initRand() before initHeap() during initialization
+  - runtime: use rand_hwrng hardwareRand for RP2040/RP2350 (#5135)
+* **libs**
+  - picolibc: use updated location for git repo
+
+0.40.0
+---
+* **general**
+  - all: add full LLVM 20 support
+  - core: feat: enable //go:linkname pragma for globals
+  - core: feature: Add flag to ignore go compatibility matrix (#5078)
+  - chore: update version for 0.40 development cycle
+* **compiler**
+  - emit an error when the actual arch doesn't match GOARCH
+  - mark string parameters as readonly
+  - use Tarjan's SCC algorithm to detect loops for defer
+  - lower "large stack" limit to 16kb
+* **core**
+  - shrink bdwgc library
+  - Fix linker errors for runtime.vgetrandom and crypto/internal/sysrand.fatal
+  - fix: add TryLock to sync.RWMutex
+  - fix: correct linter issues exposed by the fix in #4679
+  - fix: don't hardcode success return state
+  - fix: expand RTT debugger compatibility
+  - internal/task (threads): save stack bounds instead of scanning under a lock
+  - internal/task: create detached threads and fix error handling
+  - interp: better errors when debugging interp
+  - transform (gc): create stack slots in callers of external functions
+  - internal/task: prevent semaphore resource leak for threads scheduler
+* **machine**
+  - cortexm: optimize code size for the HardFault_Handler
+  - fe310: add I2C pins for the HiFive1b
+  - clarify WriteAt semantics of BlockDevice
+  - fix deprecated AsmFull comment (#5005)
+  - make sure DMA buffers do not escape unnecessarily
+  - only enable USB-CDC when needed
+  - use larger SPI MAXCNT on nrf52833 and nrf52840
+  - fix: update m.queuedBytes when clamping output to avoid corrupting sentBytes
+  - fix: use int64 in ReadTemperature to avoid overflow
+  - fix(rp2): disable DBGPAUSE on startup
+  - fix(rp2): possible integer overflow while computing factors for SPI baudrate
+  - fix(rp2): reset spinlocks at startup
+  - fix(rp2): switch spinlock busy loop to wfe
+  - fix(rp2): use side-effect-free spinlocks
+  - nrf: add ADC_VDDH which is an ADC pin for VDDH
+  - nrf: don't block SPI transfer
+  - nrf: don't set PSELN, it's ignored in single ended mode anyway
+  - nrf: fix typo in ADC configuration
+  - nrf: refactor SoftDevice enabled check
+  - nrf: rename pwmPin to adcPin
+  - nrf: support flash operations while the SoftDevice is enabled
+  - rp2040: allow writing to the UART inside interrupts
+  - machine,nrf528: stop the bus only once on I2C bus error and ensures the first error is returned
+* **net**
+  - update submodule to latest commits
+* **runtime**
+  - (avr): fix infinite longjmp loop if stack is aligned to 256 bytes
+  - (gc_blocks.go): clear full size of allocation
+  - (gc_blocks.go): make sweep branchless
+  - (gc_blocks.go): simplify scanning logic
+  - (gc_blocks.go): use a linked stack to scan marked objects
+  - (gc_blocks.go): use best-fit allocation
+  - (gc_boehm.go): fix world already stopped check
+  - (wasm): scan the system stack
+  - fix sleep duration for long sleeps
+  - remove copied code for nrf52840
+  - src/syscall: update src buffer after write
+  - wasm: fix C realloc and optimize it a bit
+* **targets**
+  - add xiao-esp32s3 board target
+  - Add ESP32-S3 support (#5091)
+  - Added Gopher ARCADE board
+  - Create "pico2-ice" target board (#5062)
+* **build/test**
+  - Add testing.T.Context() and testing.B.Context()
+  - create separate go.mod file for testing dependencies for wasm tests that use Chromium headless browser to avoid use of older incompatible version.
+  - go back to normal scheduler instead of tasks scheduler for macos CI
+  - update CI to use Go 1.25.5
+  - update macOS GH actions builds to handle sunset of macOS 13
+  - use task scheduler on macOS builds to avoid test race condition lockups
+  - update all CI builds to use latest stable Go release. Also update some of the actions to their latest releases.
+  - update GH actions builds to use Go 1.25.4
+  - uninstall cmake before install
+  - fix: point the submodule for musl-lib to a mirror in the TinyGo GitHub org
+  - fix: remove macOS 15 from CI build matrix (conflicts with macOS 14 build)
+  - fix: separate host expected bytes from device intended bytes
+  - fix/typo: makeESPFirmwareImage
+  - make: GNUmakefile: shrink TinyGo binaries on Linux
+  - move the directory list into a variable
+  - several improvements to the macOS GH actions build
+  - Fix for #4678: top-level 'make lint' wasn't working
+  - fix: increase the timeout for chromedp to connect to the headless browser used for running the wasm tests.
+  - testdata: some more packages for the test corpus
+
+0.39.0
+---
+* **general**
+  - all: add Go 1.25 support
+  - net: update to latest tinygo net package
+  - docs: clarify build verification step for macOS users
+  - Add flag to skip Renesas SVD builds
+* **build**
+  - Makefile: install missing dlmalloc files
+  - flash: add -o flag support to save built binary (Fixes #4937) (#4942)
+  - fix: update version of clang to 17 to accommodate latest Go 1.25 docker base image
+* **ci**
+  - chore: update all CI builds to test Go 1.25 release
+  - fix: disable test-newest since CircleCI seems unable to download due to rate-limits on Dockerhub
+  - ci: rename some jobs to avoid churn on every Go/LLVM version bump
+  - ci: make the goroutines test less racy
+  - tests: de-flake goroutines test
+* **compiler**
+  - compiler: implement internal/abi.Escape
+* **main**
+  - main: show the compiler error (if any) for `tinygo test -c`
+  - chore: correct GOOS=js name in error messages for WASM
+* **machine**
+  - machine: add international keys
+  - machine: remove some unnecessary "// peripherals:" comments
+  - machine: add I2C pin comments
+  - machine: standardize I2C errors with "i2c:" prefix
+  - machine: make I2C usable in the simulator
+  - fix: add SPI and I2C to teensy 4.1 (#4943)
+  - `rp2`: use the correct channel mask for rp2350 ADC; hold lock during read (#4938)
+  - `rp2`: disable digital input for analog inputs
+* **runtime**
+  - runtime: ensure time.Sleep(d) sleeps at least d
+  - runtime: stub out weak pointer support
+  - runtime: implement dummy AddCleanup
+  - runtime: enable multi-core scheduler for rp2350
+  - `internal/task`: use -stack-size flag when starting a new thread
+  - `internal/task`: add SA_RESTART flag to GC interrupts
+  - `internal/task`: a few small correctness fixes
+  - `internal/gclayout`: make gclayout values constants
+  - darwin: add threading support and use it by default
+* **standard library**
+  - `sync`: implement sync.Swap
+  - `reflect`: implement Method.IsExported
+* **testing**
+  - testing: stub out testing.B.Loop
+* **targets**
+  - `stm32`: add support for the STM32L031G6U6
+  - add metro-rp2350 board definition (#4989)
+  - `rp2040/rp2350`: set the default stack size to 8k for rp2040/rp2350 based boards where this was not already the case
+
+
+0.38.0
+---
+* **general**
+  - `go.*`: upgrade `golang.org/x/tools` to v0.30.0
+  - `all`: add support for LLVM 20
+* **build**
+  - go back to using MinoruSekine/setup-scoop for Windows CI builds
+  - `flake.*`: upgrade to nixpkgs 25.05, LLVM 20
+  - `Makefile`: only detect ccache command when needed
+  - `Makefile`: create random filename inside rule
+  - `Makefile`: don't set GOROOT
+  - `Makefile`: call uname at most once
+  - `Makefile`: only read NodeJS version when it is needed
+* **compiler**
+  - add support for `GODEBUG=gotypesalias=1`
+  - `interp`: fix `copy()` from/to external buffers
+  - add `-nobounds` (similar to `-gcflags=-B`)
+  - `compileopts`: add library version to cached library path
+  - `builder`: build wasi-libc inside TinyGo
+  - `builder`: simplify bdwgc libc dependency
+  - `builder`: don't use precompiled libraries
+  - `compileopts`: enable support for `GOARCH=wasm` in `tinygo test`
+* **fixes**
+  - `rp2350`: Fix DMA to SPI transmits on RP2350 (#4903)
+  - `microbit v2`: use OpenOCD flash method on microbit v2 when using Nordic Semi SoftDevice
+  - `main`: display all of the current GC options for the `-gc` flag
+  - Remove duplicated error handling
+  - `sync`: fix `TestMutexConcurrent` test
+  - fix race condition in `testdata/goroutines.go`
+  - fix build warnings on Windows ARM
+* **machine**
+  - `usb`: add USB mass storage class support
+  - implement usb receive message throttling
+  - declare usb endpoints per-platform
+  - `samd21`: implement watchdog
+  - `samd51`: write to flash memory in 512 byte long chunks
+  - `samd21`: write to flash memory in 64 byte long chunks
+  - don't inline RTT `WriteByte` everywhere
+  - `rp2`: unexport machine-specific errors
+  - `rp2`: discount scheduling delays in I2C timeouts (#4876)
+  - use pointer receiver in simulated PWM peripherals
+  - add simulated PWM/timer peripherals
+  - `rp2`: expose usb endpoint stall handling
+  - `arm`: clear pending interrupts before enabling them
+  - `rp2`: merge common usb code (#4856)
+* **main**
+  - add "cores" and "threads" schedulers to help text
+  - add `StartPos` and `EndPos` to `-json` build output
+  - change `-json` flag to match upstream Go
+* **runtime**
+  - don't lock the print output inside interrupts
+  - don't try to interrupt other cores before they are started
+  - implement `NumCPU` for the multicore scheduler
+  - add support for multicore scheduler
+  - refactor obtaining the system stack
+  - `interrupt`: add `Checkpoint` type
+  - add `exportedFuncPtr`
+  - avoid an allocation in `(*time.Timer).Reset`
+  - stub runtime signal functions for `os/signal` on wasip1
+  - move `timeUnit` to a single place
+  - implement `NumCPU` for `-scheduler=threads`
+  - move `mainExited` boolean
+  - `internal/task`: rename `tinygo_pause` to `tinygo_task_exit`
+  - map every goroutine to a new OS thread
+  - refactor `timerQueue`
+  - make conservative and precise GC MT-safe
+  - `internal/task`: implement atomic primitives for preemptive scheduling
+  - Use diskutil on macOS to extract volume name and path for FAT mounts #4928
+* **standard library**
+  - `net`: update submodule to latest commits
+  - `runtime/debug`: add GC related stubs
+  - `metrics`: flesh out some of the metric types
+  - `reflect`: Chan related stubs
+  - `os`: handle relative and abs paths in `Executable()`
+  - `os`: add `os.Executable()` for Darwin
+  - `sync`: implement `RWMutex` using futexes
+  - `reflect`: Add `SliceOf`, `ArrayOf`, `StructOf`, `MapOf`, `FuncOf`
+* **targets**
+  - `rp2040`: add multicore support
+  - `riscv32`: use `gdb` binary as a fallback
+  - add target for Microbit v2 with SoftDevice S140 support for both peripheral and central
+  - `windows`: use MSVCRT.DLL instead of UCRT on i386
+  - `windows`: add windows/386 support
+  - `arm64`: remove unnecessary `.section` directive
+  - `riscv-qemu`: actually sleep in `time.Sleep()`
+  - `riscv`: define CSR constants and use them where possible
+  - `darwin`: support Boehm GC (and use by default)
+  - `windows`: add support for the Boehm-Demers-Weiser GC
+  - `windows`: fix wrong register for first parameter
+* **wasm**
+  - add Boehm GC support
+  - refactor/modify stub signal handling
+  - don't block `//go:wasmexport` because of running goroutines
+  - use `int64` instead of `float64` for the `timeUnit`
+* **boards**
+  - Add board support for BigTreeTech SKR Pico (#4842)
+
+
+0.37.0
+---
+* **general**
+  - add the Boehm-Demers-Weiser GC on Linux
+* **ci**
+  - add more tests for wasm and baremetal
+* **compiler**
+  - crypto/internal/sysrand is allowed to use unsafe signatures
+* **examples**
+  - add goroutine benchmark to examples
+* **fixes**
+  - ensure use of pointers for SPI interface on atsam21/atsam51 and other machines/boards that were missing implementation (#4798)
+  - replace loop counter with hw timer for USB SetAddressReq on rp2040 (#4796)
+* **internal**
+  - update to go.bytecodealliance.org@v0.6.2 in GNUmakefile and internal/wasm-tools
+  - exclude certain files when copying package in internal/cm
+  - update to go.bytecodealliance.org/cm@v0.2.2 in internal/cm
+  - remove old reflect.go in internal/reflectlite
+* **loader**
+  - use build tags for package iter and iter methods on reflect.Value in loader, iter, reflect
+  - add shim for go1.22 and earlier in loader, iter
+* **machine**
+  - bump rp2040 to 200MHz (#4768)
+  - correct register address for Pin.SetInterrupt for rp2350 (#4782)
+  - don't block the rp2xxx UART interrupt handler
+  - fix RP2040 Pico board on the playground
+  - add flash support for rp2350 (#4803)
+* **os**
+  - add stub Symlink for wasm
+* **refactor**
+  - use *SPI everywhere to make consistent for implementations. Fixes #4663 "in reverse" by making SPI a pointer everywhere, as discussed in the comments.
+* **reflect**
+  - add Value.SetIter{Key,Value} and MapIter.Reset in reflect, internal/reflectlite
+  - embed reflectlite types into reflect types in reflect, internal/reflectlite
+  - add Go 1.24 iter.Seq[2] methods
+  - copy reflect iter tests from upstream Go
+  - panic on Type.CanSeq[2] instead of returning false
+  - remove strconv.go
+  - remove unused go:linkname functions
+* **riscv-qemu**
+  - add VirtIO RNG device
+  - increase stack size
+* **runtime**
+  - only allocate heap memory when needed
+  - remove unused file func.go
+  - use package reflectlite
+* **transform**
+  - cherry-pick from #4774
+
+
+0.36.0
+---
+* **general**
+  - add initial Go 1.24 support
+  - add support for LLVM 19
+  - update license for 2025
+  - make small corrections for README regarding wasm
+  - use GOOS and GOARCH for building wasm simulated boards
+  - only infer target for wasm when GOOS and GOARCH are set correctly, not just based on file extension
+  - add test-corpus-wasip2
+  - use older image for cross-compiling builds
+  - update Linux builds to run on ubuntu-latest since 20.04 is being retired
+  - ensure build output directory is created
+  - add NoSandbox flag to chrome headless that is run during WASM tests, since this is now required for Ubuntu 23+ and we are using Ubuntu 24+ when running Github Actions
+  - update wasmtime used for CI to 29.0.1 to fix issue with install during CI tests
+  - update to use `Get-CimInstance` as `wmic` is being deprecated on WIndows
+  - remove unnecessary executable permissions
+  - `goenv`: update to new v0.36.0 development version
+* **compiler**
+  - `builder`: fix parsing of external ld.lld error messages
+  - `cgo`: mangle identifier names
+  - `interp`: correctly mark functions as modifying memory
+  - add buildmode=wasi-legacy to support existing base of users who expected the older behavior for wasi modules to not return an exit code as if they were reactors
+* **standard library**
+  - `crypto/tls`: add Dialer.DialContext() to fix websocket client
+  - `crypto/tls`: add VersionTLS constants and VersionName(version uint16) method that turns it into a string, copied from big go
+  - `internal/syscall/unix`: use our own version of this package
+  - `machine`: replace hard-coded cpu frequencies on rp2xxx
+  - `machine`: bump rp2350 CPUFrequency to 150 MHz
+  - `machine`: compute rp2 clock dividers from crystal and target frequency
+  - `machine`: remove bytes package dependency in flash code
+  - `machine/usb/descriptor`: avoid bytes package
+  - `net`: update to latest submodule with httptest subpackage and ResolveIPAddress implementation
+  - `os`: add File.Chdir support
+  - `os`: implement stub Chdir for non-OS systems
+  - `os/file`: add file.Chmod
+  - `reflect`: implement Value.Equal
+  - `runtime`: add FIPS helper functions
+  - `runtime`: manually initialize xorshift state
+  - `sync`: move Mutex to internal/task
+  - `syscall`: add wasip1 RandomGet
+  - `testing`: add Chdir
+  - `wasip2`: add stubs to get internal/syscall/unix to work
+* **fixes**
+  - correctly handle calls for GetRNG() when being made from nrf devices with SoftDevice enabled
+  - fix stm32f103 ADC
+  - `wasm`: correctly handle id lookup for finalizeRef call
+  - `wasm`: avoid total failure on wasm finalizer call
+  - `wasm`: convert offset as signed int into unsigned int in syscall/js.stringVal in wasm_exec.js
+* **targets**
+  - rp2350: add pll generalized solution; fix ADC handles; pwm period fix
+  - rp2350: extending support to include the rp2350b
+  - rp2350: cleanup: unexport internal USB and clock package variable, consts and types
+  - nrf: make ADC resolution changeable
+  - turn on GC for TKey1 device, since it does in fact work
+  - match Pico2 stack size to Pico
+* **boards**
+  - add support for Pimoroni Pico Plus2
+  - add target for pico2-w board
+  - add comboat_fw tag for elecrow W5 boards with Combo-AT Wifi firmware
+  - add support for Elecrow Pico rp2350 W5 boards
+  - add support for Elecrow Pico rp2040 W5 boards
+  - add support for NRF51 HW-651
+  - add support for esp32c3-supermini
+  - add support for waveshare-rp2040-tiny
+* **examples**
+  - add naive debouncing for pininterrupt example
+
+
 0.35.0
 ---
 * **general**
@@ -1,8 +1,8 @@
 # tinygo-llvm stage obtains the llvm source for TinyGo
-FROM golang:1.23 AS tinygo-llvm
+FROM golang:1.27rc2 AS tinygo-llvm

 RUN apt-get update && \
-    apt-get install -y apt-utils make cmake clang-15 ninja-build && \
+    apt-get install -y apt-utils make cmake clang-17 ninja-build && \
    rm -rf \
        /var/lib/apt/lists/* \
        /var/log/* \
@@ -33,7 +33,7 @@ RUN cd /tinygo/ && \

 # tinygo-compiler copies the compiler build over to a base Go container (without
 # all the build tools etc).
-FROM golang:1.23 AS tinygo-compiler
+FROM golang:1.27rc2 AS tinygo-compiler

 # Copy tinygo build.
 COPY --from=tinygo-compiler-build /tinygo/build/release/tinygo /tinygo
@@ -8,13 +8,20 @@ LLVM_PROJECTDIR ?= llvm-project
 CLANG_SRC ?= $(LLVM_PROJECTDIR)/clang
 LLD_SRC ?= $(LLVM_PROJECTDIR)/lld

+ifeq ($(OS),Windows_NT)
+    # avoid calling uname on Windows
+    uname := Windows_NT
+else
+    uname := $(shell uname -s)
+endif
+
 # Try to autodetect LLVM build tools.
 # Versions are listed here in descending priority order.
 LLVM_VERSIONS = 19 18 17 16 15
 errifempty = $(if $(1),$(1),$(error $(2)))
 detect = $(shell which $(call errifempty,$(firstword $(foreach p,$(2),$(shell command -v $(p) 2> /dev/null && echo $(p)))),failed to locate $(1) at any of: $(2)))
 toolSearchPathsVersion = $(1)-$(2)
-ifeq ($(shell uname -s),Darwin)
+ifeq ($(uname),Darwin)
 	# Also explicitly search Brew's copy, which is not in PATH by default.
 	BREW_PREFIX := $(shell brew --prefix)
 	toolSearchPathsVersion += $(BREW_PREFIX)/opt/llvm@$(2)/bin/$(1)-$(2) $(BREW_PREFIX)/opt/llvm@$(2)/bin/$(1)
@@ -27,7 +34,6 @@ LLVM_NM ?= $(call findLLVMTool,llvm-nm)

 # Go binary and GOROOT to select
 GO ?= go
-export GOROOT = $(shell $(GO) env GOROOT)

 # Flags to pass to go test.
 GOTESTFLAGS ?=
@@ -38,14 +44,10 @@ TINYGO ?= $(call detect,tinygo,tinygo $(CURDIR)/build/tinygo)

 # Check for ccache if the user hasn't set it to on or off.
 ifeq (, $(CCACHE))
-    # Use CCACHE for LLVM if possible
-    ifneq (, $(shell command -v ccache 2> /dev/null))
-        CCACHE := ON
-    else
-        CCACHE := OFF
-    endif
+    LLVM_OPTION += '-DLLVM_CCACHE_BUILD=$(if $(shell command -v ccache 2> /dev/null),ON,OFF)'
+else
+    LLVM_OPTION += '-DLLVM_CCACHE_BUILD=$(CCACHE)'
 endif
-LLVM_OPTION += '-DLLVM_CCACHE_BUILD=$(CCACHE)'

 # Allow enabling LLVM assertions
 ifeq (1, $(ASSERT))
@@ -77,6 +79,26 @@ ifeq (1, $(STATIC))
    BINARYEN_OPTION += -DCMAKE_CXX_FLAGS="-static" -DCMAKE_C_FLAGS="-static"
 endif

+# Optimize the binary size for Linux.
+# These flags may work on other platforms, but have only been tested on Linux.
+ifeq ($(uname),Linux)
+    HAS_MOLD := $(shell command -v ld.mold 2> /dev/null)
+    HAS_LLD := $(shell command -v ld.lld 2> /dev/null)
+    LLVM_CFLAGS := -ffunction-sections -fdata-sections -fvisibility=hidden
+    LLVM_LDFLAGS := -Wl,--gc-sections
+    ifneq ($(HAS_MOLD),)
+        # Mold might be slightly faster.
+        LLVM_LDFLAGS += -fuse-ld=mold -Wl,--icf=all
+    else ifneq ($(HAS_LLD),)
+        # LLD is more commonly available.
+        LLVM_LDFLAGS += -fuse-ld=lld -Wl,--icf=all
+    endif
+    LLVM_OPTION += \
+        -DCMAKE_C_FLAGS="$(LLVM_CFLAGS)" \
+        -DCMAKE_CXX_FLAGS="$(LLVM_CFLAGS)"
+    CGO_LDFLAGS += $(LLVM_LDFLAGS)
+endif
+
 # Cross compiling support.
 ifneq ($(CROSS),)
    CC = $(CROSS)-gcc
@@ -111,7 +133,7 @@ endif

 .PHONY: all tinygo test $(LLVM_BUILDDIR) llvm-source clean fmt gen-device gen-device-nrf gen-device-nxp gen-device-avr gen-device-rp

-LLVM_COMPONENTS = all-targets analysis asmparser asmprinter bitreader bitwriter codegen core coroutines coverage debuginfodwarf debuginfopdb executionengine frontenddriver frontendhlsl frontendopenmp instrumentation interpreter ipo irreader libdriver linker lto mc mcjit objcarcopts option profiledata scalaropts support target windowsdriver windowsmanifest
+LLVM_COMPONENTS = all-targets analysis asmparser asmprinter bitreader bitwriter codegen core coroutines coverage debuginfodwarf debuginfopdb dtlto executionengine frontenddriver frontendhlsl frontendopenmp instrumentation interpreter ipo irreader libdriver linker lto mc mcjit objcarcopts option profiledata scalaropts support target windowsdriver windowsmanifest

 ifeq ($(OS),Windows_NT)
    EXE = .exe
@@ -120,6 +142,9 @@ ifeq ($(OS),Windows_NT)

    # PIC needs to be disabled for libclang to work.
    LLVM_OPTION += -DLLVM_ENABLE_PIC=OFF
+    # Statically link the C++ and GCC runtime into LLVM tools so they don't
+    # depend on MinGW DLLs that may not be on PATH when executed during the build.
+    LLVM_OPTION += '-DCMAKE_EXE_LINKER_FLAGS=-static-libgcc -static-libstdc++'

    CGO_CPPFLAGS += -DCINDEX_NO_EXPORTS
    CGO_LDFLAGS += -static -static-libgcc -static-libstdc++
@@ -127,14 +152,14 @@ ifeq ($(OS),Windows_NT)

    USE_SYSTEM_BINARYEN ?= 1

-else ifeq ($(shell uname -s),Darwin)
+else ifeq ($(uname),Darwin)
    MD5SUM ?= md5

    CGO_LDFLAGS += -lxar

    USE_SYSTEM_BINARYEN ?= 1

-else ifeq ($(shell uname -s),FreeBSD)
+else ifeq ($(uname),FreeBSD)
    MD5SUM ?= md5
    START_GROUP = -Wl,--start-group
    END_GROUP = -Wl,--end-group
@@ -147,7 +172,7 @@ endif
 MD5SUM ?= md5sum

 # Libraries that should be linked in for the statically linked Clang.
-CLANG_LIB_NAMES = clangAnalysis clangAPINotes clangAST clangASTMatchers clangBasic clangCodeGen clangCrossTU clangDriver clangDynamicASTMatchers clangEdit clangExtractAPI clangFormat clangFrontend clangFrontendTool clangHandleCXX clangHandleLLVM clangIndex clangInstallAPI clangLex clangParse clangRewrite clangRewriteFrontend clangSema clangSerialization clangSupport clangTooling clangToolingASTDiff clangToolingCore clangToolingInclusions
+CLANG_LIB_NAMES = clangAnalysis clangAnalysisLifetimeSafety clangAPINotes clangAST clangASTMatchers clangBasic clangCodeGen clangCrossTU clangDriver clangDynamicASTMatchers clangEdit clangExtractAPI clangFormat clangFrontend clangFrontendTool clangHandleCXX clangHandleLLVM clangIndex clangInstallAPI clangLex clangOptions clangParse clangRewrite clangRewriteFrontend clangSema clangSerialization clangSupport clangTooling clangToolingASTDiff clangToolingCore clangToolingInclusions
 CLANG_LIBS = $(START_GROUP) $(addprefix -l,$(CLANG_LIB_NAMES)) $(END_GROUP) -lstdc++

 # Libraries that should be linked in for the statically linked LLD.
@@ -155,7 +180,7 @@ LLD_LIB_NAMES = lldCOFF lldCommon lldELF lldMachO lldMinGW lldWasm
 LLD_LIBS = $(START_GROUP) $(addprefix -l,$(LLD_LIB_NAMES)) $(END_GROUP)

 # Other libraries that are needed to link TinyGo.
-EXTRA_LIB_NAMES = LLVMInterpreter LLVMMCA LLVMRISCVTargetMCA LLVMX86TargetMCA
+EXTRA_LIB_NAMES = LLVMDTLTO LLVMInterpreter LLVMMCA LLVMRISCVTargetMCA LLVMX86TargetMCA

 # All libraries to be built and linked with the tinygo binary (lib/lib*.a).
 LIB_NAMES = clang $(CLANG_LIB_NAMES) $(LLD_LIB_NAMES) $(EXTRA_LIB_NAMES)
@@ -172,6 +197,12 @@ NINJA_BUILD_TARGETS = clang llvm-config llvm-ar llvm-nm lld $(addprefix lib/lib,
 ifneq ("$(wildcard $(LLVM_BUILDDIR)/bin/llvm-config*)","")
    CGO_CPPFLAGS+=$(shell $(LLVM_CONFIG_PREFIX) $(LLVM_BUILDDIR)/bin/llvm-config --cppflags) -I$(abspath $(LLVM_BUILDDIR))/tools/clang/include -I$(abspath $(CLANG_SRC))/include -I$(abspath $(LLD_SRC))/include
    CGO_CXXFLAGS=-std=c++17
+ifneq ($(uname),Windows_NT)
+    # Disable GCC DWARF compression: lld built without zlib cannot link
+    # object files with ELFCOMPRESS_ZLIB debug sections.
+    CGO_CFLAGS+=-gz=none
+    CGO_CXXFLAGS+=-gz=none
+endif
    CGO_LDFLAGS+=-L$(abspath $(LLVM_BUILDDIR)/lib) -lclang $(CLANG_LIBS) $(LLD_LIBS) $(shell $(LLVM_CONFIG_PREFIX) $(LLVM_BUILDDIR)/bin/llvm-config --ldflags --libs --system-libs $(LLVM_COMPONENTS)) -lstdc++ $(CGO_LDFLAGS_EXTRA)
 endif

@@ -185,7 +216,10 @@ fmt-check: ## Warn if any source needs reformatting
 	@unformatted=$$(gofmt -l $(FMT_PATHS)); [ -z "$$unformatted" ] && exit 0; echo "Unformatted:"; for fn in $$unformatted; do echo "  $$fn"; done; exit 1


-gen-device: gen-device-avr gen-device-esp gen-device-nrf gen-device-sam gen-device-sifive gen-device-kendryte gen-device-nxp gen-device-rp gen-device-renesas ## Generate microcontroller-specific sources
+gen-device: gen-device-avr gen-device-esp gen-device-nrf gen-device-sam gen-device-sifive gen-device-kendryte gen-device-nxp gen-device-rp ## Generate microcontroller-specific sources
+ifneq ($(RENESAS), 0)
+gen-device: gen-device-renesas
+endif
 ifneq ($(STM32), 0)
 gen-device: gen-device-stm32
 endif
@@ -238,7 +272,7 @@ gen-device-renesas: build/gen-device-svd
 	GO111MODULE=off $(GO) fmt ./src/device/renesas

 $(LLVM_PROJECTDIR)/llvm:
-	git clone -b xtensa_release_19.1.2 --depth=1 https://github.com/espressif/llvm-project $(LLVM_PROJECTDIR)
+	git clone -b tinygo_22.x --depth=1 https://github.com/tinygo-org/llvm-project $(LLVM_PROJECTDIR)
 llvm-source: $(LLVM_PROJECTDIR)/llvm ## Get LLVM sources

 # Configure LLVM.
@@ -259,41 +293,35 @@ build/wasm-opt$(EXE):
 	cp lib/binaryen/bin/wasm-opt$(EXE) build/wasm-opt$(EXE)
 endif

-# Build wasi-libc sysroot
-.PHONY: wasi-libc
-wasi-libc: lib/wasi-libc/sysroot/lib/wasm32-wasi/libc.a
-lib/wasi-libc/sysroot/lib/wasm32-wasi/libc.a:
-	@if [ ! -e lib/wasi-libc/Makefile ]; then echo "Submodules have not been downloaded. Please download them using:\n  git submodule update --init"; exit 1; fi
-	cd lib/wasi-libc && $(MAKE) -j4 EXTRA_CFLAGS="-O2 -g -DNDEBUG -mnontrapping-fptoint -msign-ext" MALLOC_IMPL=none CC="$(CLANG)" AR=$(LLVM_AR) NM=$(LLVM_NM)
-
 # Generate WASI syscall bindings
-WASM_TOOLS_MODULE=github.com/bytecodealliance/wasm-tools-go
+WASM_TOOLS_MODULE=go.bytecodealliance.org
 .PHONY: wasi-syscall
 wasi-syscall: wasi-cm
-	go run -modfile ./internal/wasm-tools/go.mod $(WASM_TOOLS_MODULE)/cmd/wit-bindgen-go generate --versioned -o ./src/internal -p internal --cm internal/cm ./lib/wasi-cli/wit
+	rm -rf ./src/internal/wasi/*
+	go run $(WASM_TOOLS_MODULE)/cmd/wit-bindgen-go generate --versioned -o ./src/internal -p internal --cm internal/cm ./lib/wasi-cli/wit

 # Copy package cm into src/internal/cm
 .PHONY: wasi-cm
 wasi-cm:
-	# rm -rf ./src/internal/cm
-	rsync -rv --delete --exclude '*_test.go' $(shell go list -modfile ./internal/wasm-tools/go.mod -m -f {{.Dir}} $(WASM_TOOLS_MODULE))/cm ./src/internal/
+	rm -rf ./src/internal/cm/*
+	rsync -rv --delete --exclude go.mod --exclude '*_test.go' --exclude '*_json.go' --exclude '*.md' --exclude LICENSE $(shell go list -m -f {{.Dir}} $(WASM_TOOLS_MODULE)/cm)/ ./src/internal/cm

 # Check for Node.js used during WASM tests.
-NODEJS_VERSION := $(word 1,$(subst ., ,$(shell node -v | cut -c 2-)))
-MIN_NODEJS_VERSION=18
+MIN_NODEJS_VERSION=22

 .PHONY: check-nodejs-version
 check-nodejs-version:
-ifeq (, $(shell which node))
-	@echo "Install NodeJS version 18+ to run tests."; exit 1;
-endif
-	@if [ $(NODEJS_VERSION) -lt $(MIN_NODEJS_VERSION) ]; then echo "Install NodeJS version 18+ to run tests."; exit 1; fi
+	@# Check whether NodeJS is available.
+	@if ! command -v node 2>&1 >/dev/null; then echo "Install NodeJS version ${MIN_NODEJS_VERSION}+ to run tests."; exit 1; fi
+
+	@# Check whether the version is high enough.
+	@if [ "`node -v | sed 's/v\([0-9]\+\).*/\\1/g'`" -lt $(MIN_NODEJS_VERSION) ]; then echo "Install NodeJS version $(MIN_NODEJS_VERSION)+ to run tests."; exit 1; fi

 tinygo: ## Build the TinyGo compiler
 	@if [ ! -f "$(LLVM_BUILDDIR)/bin/llvm-config" ]; then echo "Fetch and build LLVM first by running:"; echo "  $(MAKE) llvm-source"; echo "  $(MAKE) $(LLVM_BUILDDIR)"; exit 1; fi
-	CGO_CPPFLAGS="$(CGO_CPPFLAGS)" CGO_CXXFLAGS="$(CGO_CXXFLAGS)" CGO_LDFLAGS="$(CGO_LDFLAGS)" $(GOENVFLAGS) $(GO) build -buildmode exe -o build/tinygo$(EXE) -tags "byollvm osusergo" .
-test: wasi-libc check-nodejs-version
-	CGO_CPPFLAGS="$(CGO_CPPFLAGS)" CGO_CXXFLAGS="$(CGO_CXXFLAGS)" CGO_LDFLAGS="$(CGO_LDFLAGS)" $(GO) test $(GOTESTFLAGS) -timeout=1h -buildmode exe -tags "byollvm osusergo" $(GOTESTPKGS)
+	CGO_CPPFLAGS="$(CGO_CPPFLAGS)" CGO_CFLAGS="$(CGO_CFLAGS)" CGO_CXXFLAGS="$(CGO_CXXFLAGS)" CGO_LDFLAGS="$(CGO_LDFLAGS)" $(GOENVFLAGS) $(GO) build -buildmode exe -o build/tinygo$(EXE) -tags "byollvm llvm22 osusergo" .
+test: check-nodejs-version
+	CGO_CPPFLAGS="$(CGO_CPPFLAGS)" CGO_CXXFLAGS="$(CGO_CXXFLAGS)" CGO_LDFLAGS="$(CGO_LDFLAGS)" $(GO) test $(GOTESTFLAGS) -timeout=1h -buildmode exe -tags "byollvm llvm22 osusergo" $(GOTESTPKGS)

 # Standard library packages that pass tests on darwin, linux, wasi, and windows, but take over a minute in wasi
 TEST_PACKAGES_SLOW = \
@@ -309,11 +337,9 @@ TEST_PACKAGES_FAST = \
 	container/heap \
 	container/list \
 	container/ring \
-	crypto/des \
 	crypto/ecdsa \
 	crypto/elliptic \
 	crypto/md5 \
-	crypto/rc4 \
 	crypto/sha1 \
 	crypto/sha256 \
 	crypto/sha512 \
@@ -322,14 +348,17 @@ TEST_PACKAGES_FAST = \
 	embed/internal/embedtest \
 	encoding \
 	encoding/ascii85 \
+	errors \
 	encoding/asn1 \
 	encoding/base32 \
 	encoding/base64 \
 	encoding/csv \
 	encoding/hex \
+	expvar \
 	go/ast \
 	go/format \
 	go/scanner \
+	go/token \
 	go/version \
 	hash \
 	hash/adler32 \
@@ -342,6 +371,7 @@ TEST_PACKAGES_FAST = \
 	math/cmplx \
 	net/http/internal/ascii \
 	net/mail \
+	net/url \
 	os \
 	path \
 	reflect \
@@ -355,40 +385,39 @@ TEST_PACKAGES_FAST = \
 	unique \
 	$(nil)

-# Assume this will go away before Go2, so only check minor version.
-ifeq ($(filter $(shell $(GO) env GOVERSION | cut -f 2 -d.), 16 17 18), )
-TEST_PACKAGES_FAST += crypto/internal/nistec/fiat
-else
-TEST_PACKAGES_FAST += crypto/elliptic/internal/fiat
-endif
-
 # archive/zip requires os.ReadAt, which is not yet supported on windows
 # bytes requires mmap
 # compress/flate appears to hang on wasi
-# crypto/aes fails on wasi, needs panic()/recover()
+# crypto/aes needs reflect.Type.Method(), not yet implemented
+# crypto/des fails on wasi, needs panic()/recover()
 # crypto/hmac fails on wasi, it exits with a "slice out of range" panic
 # debug/plan9obj requires os.ReadAt, which is not yet supported on windows
-# image requires recover(), which is not yet supported on wasi
+# encoding/xml takes a minute on linux and gives a stack overflow on wasi
+# image fails on wasi, needs panic()/recover()
 # io/ioutil requires os.ReadDir, which is not yet supported on windows or wasi
-# mime: fail on wasi; neds panic()/recover()
+# mime: fails on wasi, needs panic()/recover()
 # mime/multipart: needs wasip1 syscall.FDFLAG_NONBLOCK
 # mime/quotedprintable requires syscall.Faccessat
 # net/mail: needs wasip1  syscall.FDFLAG_NONBLOCK
 # net/ntextproto: needs wasip1 syscall.FDFLAG_NONBLOCK
-# regexp/syntax: fails on wasip1; needs panic()/recover()
-# strconv requires recover() which is not yet supported on wasi
-# text/tabwriter requires recover(), which is not yet supported on wasi
-# text/template/parse requires recover(), which is not yet supported on wasi
+# regexp/syntax: fails on wasip1, needs panic()/recover()
+# strconv: fails on wasi, needs panic()/recover()
+# text/tabwriter: fails on wasi, needs panic()/recover()
+# text/template/parse: fails on wasi, needs panic()/recover()
 # testing/fstest requires os.ReadDir, which is not yet supported on windows or wasi

 # Additional standard library packages that pass tests on individual platforms
 TEST_PACKAGES_LINUX := \
 	archive/zip \
 	compress/flate \
+	context \
 	crypto/aes \
+	crypto/des \
+	crypto/ecdh \
 	crypto/hmac \
 	debug/dwarf \
 	debug/plan9obj \
+	encoding/xml \
 	image \
 	io/ioutil \
 	mime \
@@ -400,22 +429,64 @@ TEST_PACKAGES_LINUX := \
 	os/user \
 	regexp/syntax \
 	strconv \
+	testing/fstest \
 	text/tabwriter \
 	text/template/parse

 TEST_PACKAGES_DARWIN := $(TEST_PACKAGES_LINUX)

+# os/user requires t.Skip() support
 TEST_PACKAGES_WINDOWS := \
 	compress/flate \
+	crypto/des \
 	crypto/hmac \
-	os/user \
+	image \
+	mime \
+	regexp/syntax \
 	strconv \
+	text/tabwriter \
 	text/template/parse \
 	$(nil)

+
+# These packages cannot be tested on wasm, mostly because these tests assume a
+# working filesystem. This could perhaps be fixed, by supporting filesystem
+# access when running inside Node.js.
+TEST_PACKAGES_WASM = $(filter-out $(TEST_PACKAGES_NONWASM), $(TEST_PACKAGES_FAST))
+TEST_PACKAGES_NONWASM = \
+	compress/lzw \
+	compress/zlib \
+	crypto/ecdsa \
+	debug/macho \
+	embed/internal/embedtest \
+	expvar \
+	go/format \
+	os \
+	testing \
+	$(nil)
+
+# These packages cannot be tested on baremetal.
+#
+# Some reasons why the tests don't pass on baremetal:
+#
+#   * No filesystem is available, so packages like compress/zlib can't be tested
+#     (just like wasm).
+#   * picolibc math functions apparently are less precise, the math package
+#     fails on baremetal.
+TEST_PACKAGES_BAREMETAL = $(filter-out $(TEST_PACKAGES_NONBAREMETAL), $(TEST_PACKAGES_FAST))
+TEST_PACKAGES_NONBAREMETAL = \
+	$(TEST_PACKAGES_NONWASM) \
+	math \
+	$(nil)
+
+TEST_PACKAGES_FAST_WASI = $(filter-out $(TEST_PACKAGES_NOWASI), $(TEST_PACKAGES_FAST))
+TEST_PACKAGES_NOWASI = \
+	crypto/ecdsa \
+	$(nil)
+
 # Report platforms on which each standard library package is known to pass tests
-jointmp := $(shell echo /tmp/join.$$$$)
 report-stdlib-tests-pass:
+	$(eval jointmp := $(shell echo /tmp/join.$$$$))
 	@for t in $(TEST_PACKAGES_DARWIN); do echo "$$t darwin"; done | sort > $(jointmp).darwin
 	@for t in $(TEST_PACKAGES_LINUX); do echo "$$t linux"; done | sort > $(jointmp).linux
 	@for t in $(TEST_PACKAGES_FAST) $(TEST_PACKAGES_SLOW); do echo "$$t darwin linux wasi windows"; done | sort > $(jointmp).portable
@@ -424,24 +495,34 @@ report-stdlib-tests-pass:
 	@rm $(jointmp).*

 # Standard library packages that pass tests quickly on the current platform
-ifeq ($(shell uname),Darwin)
+ifeq ($(uname),Darwin)
 TEST_PACKAGES_HOST := $(TEST_PACKAGES_FAST) $(TEST_PACKAGES_DARWIN)
 TEST_IOFS := true
+TEST_ENCODING_XML := true
 endif
-ifeq ($(shell uname),Linux)
+ifeq ($(uname),Linux)
 TEST_PACKAGES_HOST := $(TEST_PACKAGES_FAST) $(TEST_PACKAGES_LINUX)
 TEST_IOFS := true
+TEST_ENCODING_XML := true
 endif
 ifeq ($(OS),Windows_NT)
 TEST_PACKAGES_HOST := $(TEST_PACKAGES_FAST) $(TEST_PACKAGES_WINDOWS)
 TEST_IOFS := false
 endif

+TEST_SKIP_FLAG := -skip='TestExtraMethods|TestParseAndBytesRoundTrip/P256/Generic|TestAsValidation'
+TEST_ADDITIONAL_FLAGS ?=
+
 # Test known-working standard library packages.
 # TODO: parallelize, and only show failing tests (no implied -v flag).
 .PHONY: tinygo-test
 tinygo-test:
-	$(TINYGO) test $(TEST_PACKAGES_HOST) $(TEST_PACKAGES_SLOW)
+	@# TestExtraMethods: used by many crypto packages and uses reflect.Type.Method which is not implemented.
+	@# TestParseAndBytesRoundTrip/P256/Generic: needs Goexit to run defers on wasm.
+	$(TINYGO) test $(TEST_ADDITIONAL_FLAGS) $(TEST_SKIP_FLAG) $(filter-out encoding/xml,$(TEST_PACKAGES_HOST)) $(TEST_PACKAGES_SLOW)
+ifeq ($(TEST_ENCODING_XML),true)
+	$(TINYGO) test $(TEST_ADDITIONAL_FLAGS) $(TEST_SKIP_FLAG) -stack-size=16MB encoding/xml
+endif
 	@# io/fs requires os.ReadDir, not yet supported on windows or wasi. It also
 	@# requires a large stack-size. Hence, io/fs is only run conditionally.
 	@# For more details, see the comments on issue #3143.
@@ -449,24 +530,26 @@ ifeq ($(TEST_IOFS),true)
 	$(TINYGO) test -stack-size=6MB io/fs
 endif
 tinygo-test-fast:
-	$(TINYGO) test $(TEST_PACKAGES_HOST)
+	$(TINYGO) test $(TEST_SKIP_FLAG) $(TEST_PACKAGES_HOST)
 tinygo-bench:
 	$(TINYGO) test -bench . $(TEST_PACKAGES_HOST) $(TEST_PACKAGES_SLOW)
 tinygo-bench-fast:
 	$(TINYGO) test -bench . $(TEST_PACKAGES_HOST)

 # Same thing, except for wasi rather than the current platform.
+tinygo-test-wasm:
+	$(TINYGO) test -target wasm $(TEST_SKIP_FLAG) $(TEST_PACKAGES_WASM)
 tinygo-test-wasi:
-	$(TINYGO) test -target wasip1 $(TEST_PACKAGES_FAST) $(TEST_PACKAGES_SLOW) ./tests/runtime_wasi
+	$(TINYGO) test -target wasip1 $(TEST_SKIP_FLAG) $(TEST_PACKAGES_FAST) $(TEST_PACKAGES_SLOW) ./tests/runtime_wasi
 tinygo-test-wasip1:
-	GOOS=wasip1 GOARCH=wasm $(TINYGO) test $(TEST_PACKAGES_FAST) $(TEST_PACKAGES_SLOW) ./tests/runtime_wasi
+	GOOS=wasip1 GOARCH=wasm $(TINYGO) test $(TEST_SKIP_FLAG) $(TEST_PACKAGES_FAST) $(TEST_PACKAGES_SLOW) ./tests/runtime_wasi
 tinygo-test-wasip1-fast:
-	$(TINYGO) test -target=wasip1 $(TEST_PACKAGES_FAST) ./tests/runtime_wasi
+	$(TINYGO) test -target=wasip1 $(TEST_SKIP_FLAG) $(TEST_PACKAGES_FAST_WASI) ./tests/runtime_wasi

 tinygo-test-wasip2-slow:
-	$(TINYGO) test -target=wasip2 $(TEST_PACKAGES_SLOW)
+	$(TINYGO) test -target=wasip2 $(TEST_SKIP_FLAG) $(TEST_PACKAGES_SLOW)
 tinygo-test-wasip2-fast:
-	$(TINYGO) test -target=wasip2 $(TEST_PACKAGES_FAST) ./tests/runtime_wasi
+	$(TINYGO) test -target=wasip2 $(TEST_SKIP_FLAG) $(TEST_PACKAGES_FAST_WASI) ./tests/runtime_wasi

 tinygo-test-wasip2-sum-slow:
 	TINYGO=$(TINYGO) \
@@ -490,18 +573,19 @@ tinygo-bench-wasip2:
 tinygo-bench-wasip2-fast:
 	$(TINYGO) test -target wasip2 -bench . $(TEST_PACKAGES_FAST)

+# Run tests on riscv-qemu since that one provides a large amount of memory.
+tinygo-test-baremetal:
+	$(TINYGO) test -target riscv-qemu $(TEST_SKIP_FLAG) $(TEST_PACKAGES_BAREMETAL)
+
 # Test external packages in a large corpus.
 test-corpus:
-	CGO_CPPFLAGS="$(CGO_CPPFLAGS)" CGO_CXXFLAGS="$(CGO_CXXFLAGS)" CGO_LDFLAGS="$(CGO_LDFLAGS)" $(GO) test $(GOTESTFLAGS) -timeout=1h -buildmode exe -tags byollvm -run TestCorpus . -corpus=testdata/corpus.yaml
+	CGO_CPPFLAGS="$(CGO_CPPFLAGS)" CGO_CXXFLAGS="$(CGO_CXXFLAGS)" CGO_LDFLAGS="$(CGO_LDFLAGS)" $(GO) test $(GOTESTFLAGS) -timeout=1h -buildmode exe -tags "byollvm llvm22" -run TestCorpus . -corpus=testdata/corpus.yaml
 test-corpus-fast:
-	CGO_CPPFLAGS="$(CGO_CPPFLAGS)" CGO_CXXFLAGS="$(CGO_CXXFLAGS)" CGO_LDFLAGS="$(CGO_LDFLAGS)" $(GO) test $(GOTESTFLAGS) -timeout=1h -buildmode exe -tags byollvm -run TestCorpus -short . -corpus=testdata/corpus.yaml
-test-corpus-wasi: wasi-libc
-	CGO_CPPFLAGS="$(CGO_CPPFLAGS)" CGO_CXXFLAGS="$(CGO_CXXFLAGS)" CGO_LDFLAGS="$(CGO_LDFLAGS)" $(GO) test $(GOTESTFLAGS) -timeout=1h -buildmode exe -tags byollvm -run TestCorpus . -corpus=testdata/corpus.yaml -target=wasip1
-
-tinygo-baremetal:
-	# Regression tests that run on a baremetal target and don't fit in either main_test.go or smoketest.
-	# regression test for #2666: e.g. encoding/hex must pass on baremetal
-	$(TINYGO) test -target cortex-m-qemu encoding/hex
+	CGO_CPPFLAGS="$(CGO_CPPFLAGS)" CGO_CXXFLAGS="$(CGO_CXXFLAGS)" CGO_LDFLAGS="$(CGO_LDFLAGS)" $(GO) test $(GOTESTFLAGS) -timeout=1h -buildmode exe -tags "byollvm llvm22" -run TestCorpus -short . -corpus=testdata/corpus.yaml
+test-corpus-wasi:
+	CGO_CPPFLAGS="$(CGO_CPPFLAGS)" CGO_CXXFLAGS="$(CGO_CXXFLAGS)" CGO_LDFLAGS="$(CGO_LDFLAGS)" $(GO) test $(GOTESTFLAGS) -timeout=1h -buildmode exe -tags "byollvm llvm22" -run TestCorpus . -corpus=testdata/corpus.yaml -target=wasip1
+test-corpus-wasip2:
+	CGO_CPPFLAGS="$(CGO_CPPFLAGS)" CGO_CXXFLAGS="$(CGO_CXXFLAGS)" CGO_LDFLAGS="$(CGO_LDFLAGS)" $(GO) test $(GOTESTFLAGS) -timeout=1h -buildmode exe -tags "byollvm llvm22" -run TestCorpus . -corpus=testdata/corpus.yaml -target=wasip2

 .PHONY: testchdir
 testchdir:
@@ -523,6 +607,8 @@ smoketest: testchdir
 	# regression test for #2563
 	cd tests/os/smoke && $(TINYGO) test -c -target=pybadge && rm smoke.test
 	# test all examples (except pwm)
+	$(TINYGO) build -size short -o test.hex -target=pga2350             examples/echo
+	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=pca10040            examples/blinky1
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=pca10040            examples/adc
@@ -569,23 +655,31 @@ smoketest: testchdir
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=feather-rp2040      examples/device-id
 	@$(MD5SUM) test.hex
+	$(TINYGO) build -size short -o test.hex -target=pico2-ice           examples/blinky1
+	@$(MD5SUM) test.hex
+	$(TINYGO) build             -o test.efi -target=uefi-amd64          examples/test
+	@$(MD5SUM) test.efi
 	# test simulated boards on play.tinygo.org
 ifneq ($(WASM), 0)
-	$(TINYGO) build -size short -o test.wasm -tags=arduino              examples/blinky1
+	GOOS=js GOARCH=wasm $(TINYGO) build -size short -o test.wasm -tags=arduino_uno          examples/blinky1
 	@$(MD5SUM) test.wasm
-	$(TINYGO) build -size short -o test.wasm -tags=hifive1b             examples/blinky1
+	GOOS=js GOARCH=wasm $(TINYGO) build -size short -o test.wasm -tags=hifive1b             examples/blinky1
 	@$(MD5SUM) test.wasm
-	$(TINYGO) build -size short -o test.wasm -tags=reelboard            examples/blinky1
+	GOOS=js GOARCH=wasm $(TINYGO) build -size short -o test.wasm -tags=reelboard            examples/blinky1
 	@$(MD5SUM) test.wasm
-	$(TINYGO) build -size short -o test.wasm -tags=microbit             examples/microbit-blink
+	GOOS=js GOARCH=wasm $(TINYGO) build -size short -o test.wasm -tags=microbit             examples/microbit-blink
 	@$(MD5SUM) test.wasm
-	$(TINYGO) build -size short -o test.wasm -tags=circuitplay_express  examples/blinky1
+	GOOS=js GOARCH=wasm $(TINYGO) build -size short -o test.wasm -tags=circuitplay_express  examples/blinky1
 	@$(MD5SUM) test.wasm
-	$(TINYGO) build -size short -o test.wasm -tags=circuitplay_bluefruit examples/blinky1
+	GOOS=js GOARCH=wasm $(TINYGO) build -size short -o test.wasm -tags=circuitplay_bluefruit examples/blinky1
 	@$(MD5SUM) test.wasm
-	$(TINYGO) build -size short -o test.wasm -tags=mch2022              examples/machinetest
+	GOOS=js GOARCH=wasm $(TINYGO) build -size short -o test.wasm -tags=mch2022              examples/machinetest
 	@$(MD5SUM) test.wasm
-	$(TINYGO) build -size short -o test.wasm -tags=gopher_badge         examples/blinky1
+	GOOS=js GOARCH=wasm $(TINYGO) build -size short -o test.wasm -tags=gopher_badge         examples/blinky1
+	@$(MD5SUM) test.wasm
+	GOOS=js GOARCH=wasm $(TINYGO) build -size short -o test.wasm -tags=pico                 examples/blinky1
+	@$(MD5SUM) test.wasm
+	GOOS=js GOARCH=wasm $(TINYGO) build -size short -o test.wasm -tags=xiao_esp32s3         examples/blinky1
 	@$(MD5SUM) test.wasm
 endif
 	# test all targets/boards
@@ -599,8 +693,12 @@ endif
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=microbit-v2-s113v7  examples/microbit-blink
 	@$(MD5SUM) test.hex
+	$(TINYGO) build -size short -o test.hex -target=microbit-v2-s140v7  examples/microbit-blink
+	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=nrf52840-mdk        examples/blinky1
 	@$(MD5SUM) test.hex
+	$(TINYGO) build -size short -o test.hex -target=btt-skr-pico        examples/uart
+	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=pca10031            examples/blinky1
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=reelboard           examples/blinky1
@@ -671,6 +769,8 @@ endif
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=xiao                examples/blinky1
 	@$(MD5SUM) test.hex
+	$(TINYGO) build -size short -o test.hex -target=xiao-ble-plus       examples/blinky1
+	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=rak4631             examples/blinky1
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=circuitplay-express examples/dac
@@ -707,6 +807,10 @@ endif
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=pico                examples/blinky1
 	@$(MD5SUM) test.hex
+	$(TINYGO) build -size short -o test.hex -target=pico -gc=leaking    examples/blinky1
+	@$(MD5SUM) test.hex
+	$(TINYGO) build -size short -o test.hex -target=pico-w              examples/blinky1
+	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=nano-33-ble         examples/blinky1
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=nano-rp2040         examples/blinky1
@@ -737,16 +841,32 @@ endif
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=gopher-badge      examples/blinky1
 	@$(MD5SUM) test.hex
+	$(TINYGO) build -size short -o test.hex -target=gopher-arcade      examples/blinky1
+	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=ae-rp2040           examples/echo
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=thumby              examples/echo
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=pico2               examples/blinky1
 	@$(MD5SUM) test.hex
+	$(TINYGO) build -size short -o test.hex -target=pico2-w             examples/blinky1
+	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=tiny2350            examples/blinky1
 	@$(MD5SUM) test.hex
+	$(TINYGO) build -size short -o test.hex -target=badger2350          examples/blinky1
+	@$(MD5SUM) test.hex
+	$(TINYGO) build -size short -o test.hex -target=blinky2350          examples/blinky1
+	@$(MD5SUM) test.hex
+	$(TINYGO) build -size short -o test.hex -target=pico-plus2          examples/blinky1
+	@$(MD5SUM) test.hex
+	$(TINYGO) build -size short -o test.hex -target=metro-rp2350        examples/blinky1
+	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=waveshare-rp2040-tiny examples/echo
 	@$(MD5SUM) test.hex
+	$(TINYGO) build -size short -o test.hex -target=vicharak_shrike-lite examples/echo
+	@$(MD5SUM) test.hex
+	$(TINYGO) build -size short -o test.hex -target=xiao-rp2350        examples/blinky1
+	@$(MD5SUM) test.hex
 	# test pwm
 	$(TINYGO) build -size short -o test.hex -target=itsybitsy-m0        examples/pwm
 	@$(MD5SUM) test.hex
@@ -761,6 +881,10 @@ endif
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=feather-nrf52840    examples/usb-midi
 	@$(MD5SUM) test.hex
+	$(TINYGO) build -size short -o test.hex -target=pico    			examples/usb-storage
+	@$(MD5SUM) test.hex
+	$(TINYGO) build -size short -o test.hex -target=pico2    			examples/usb-storage
+	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=nrf52840-s140v6-uf2-generic	examples/machinetest
 	@$(MD5SUM) test.hex
 ifneq ($(STM32), 0)
@@ -774,6 +898,8 @@ ifneq ($(STM32), 0)
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=nucleo-f722ze       examples/blinky1
 	@$(MD5SUM) test.hex
+	$(TINYGO) build -size short -o test.hex -target=nucleo-h753zi       examples/blinky1
+	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=nucleo-l031k6       examples/blinky1
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=nucleo-l432kc       examples/blinky1
@@ -800,18 +926,28 @@ ifneq ($(STM32), 0)
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=mksnanov3           examples/blinky1
 	@$(MD5SUM) test.hex
+	$(TINYGO) build -size short -o test.hex -target=stm32l0x1           examples/serial
+	@$(MD5SUM) test.hex
+	$(TINYGO) build -size short -o test.hex -target=stm32u031           examples/empty
+	@$(MD5SUM) test.hex
+	$(TINYGO) build -size short -o test.hex -target=arduino-uno-q       examples/blinky1
+	@$(MD5SUM) test.hex
+	$(TINYGO) build -size short -o test.hex -target=arduino-uno-q       examples/serial
+	@$(MD5SUM) test.hex
+	$(TINYGO) build -size short -o test.hex -target=arduino-uno-q       examples/blinkm
+	@$(MD5SUM) test.hex
 endif
 	$(TINYGO) build -size short -o test.hex -target=atmega328pb         examples/blinkm
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=atmega1284p         examples/machinetest
 	@$(MD5SUM) test.hex
-	$(TINYGO) build -size short -o test.hex -target=arduino             examples/blinky1
+	$(TINYGO) build -size short -o test.hex -target=arduino-uno         examples/blinky1
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=arduino-leonardo    examples/blinky1
 	@$(MD5SUM) test.hex
-	$(TINYGO) build -size short -o test.hex -target=arduino             examples/pwm
+	$(TINYGO) build -size short -o test.hex -target=arduino-uno         examples/pwm
 	@$(MD5SUM) test.hex
-	$(TINYGO) build -size short -o test.hex -target=arduino -scheduler=tasks  examples/blinky1
+	$(TINYGO) build -size short -o test.hex -target=arduino-uno -scheduler=tasks  examples/blinky1
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=arduino-mega1280    examples/blinky1
 	@$(MD5SUM) test.hex
@@ -823,26 +959,79 @@ endif
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=digispark           examples/blinky1
 	@$(MD5SUM) test.hex
+	$(TINYGO) build -size short -o test.hex -target=digispark           examples/pwm
+	@$(MD5SUM) test.hex
+	$(TINYGO) build -size short -o test.hex -target=digispark           examples/mcp3008
+	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=digispark -gc=leaking examples/blinky1
 	@$(MD5SUM) test.hex
 ifneq ($(XTENSA), 0)
+	$(TINYGO) build -size short -o test.bin -target=esp32-generic       examples/machinetest
+	@$(MD5SUM) test.bin
+	$(TINYGO) build -size short -o test.bin -target=esp32c3-generic     examples/machinetest
+	@$(MD5SUM) test.bin
+	$(TINYGO) build -size short -o test.bin -target=esp32s3-generic     examples/machinetest
+	@$(MD5SUM) test.bin
 	$(TINYGO) build -size short -o test.bin -target=esp32-mini32      	examples/blinky1
 	@$(MD5SUM) test.bin
 	$(TINYGO) build -size short -o test.bin -target=esp32c3-supermini   examples/blinky1
 	@$(MD5SUM) test.bin
+	$(TINYGO) build -size short -o test.bin -target=esp32c3-supermini   examples/blinkm
+	@$(MD5SUM) test.bin
 	$(TINYGO) build -size short -o test.bin -target=nodemcu             examples/blinky1
 	@$(MD5SUM) test.bin
 	$(TINYGO) build -size short -o test.bin -target m5stack-core2       examples/machinetest
 	@$(MD5SUM) test.bin
 	$(TINYGO) build -size short -o test.bin -target m5stack             examples/machinetest
 	@$(MD5SUM) test.bin
+	$(TINYGO) build -size short -o test.bin -target m5stamp-s3a         examples/machinetest
+	@$(MD5SUM) test.bin
 	$(TINYGO) build -size short -o test.bin -target m5stick-c           examples/machinetest
 	@$(MD5SUM) test.bin
 	$(TINYGO) build -size short -o test.bin -target m5paper             examples/machinetest
 	@$(MD5SUM) test.bin
 	$(TINYGO) build -size short -o test.bin -target mch2022             examples/machinetest
 	@$(MD5SUM) test.bin
+	# xiao-esp32c6
+	$(TINYGO) build -size short -o test.bin -target=xiao-esp32c6      	examples/blinky1
+	@$(MD5SUM) test.bin
+	$(TINYGO) build -size short -o test.bin -target=xiao-esp32c6   		examples/blinkm
+	@$(MD5SUM) test.bin
+	# xiao-esp32s3
+	$(TINYGO) build -size short -o test.bin -target=xiao-esp32s3   		examples/blinky1
+	@$(MD5SUM) test.bin
+	$(TINYGO) build -size short -o test.bin -target=xiao-esp32s3   		examples/blinkm
+	@$(MD5SUM) test.bin
+	$(TINYGO) build -size short -o test.bin -target=xiao-esp32s3   		examples/mcp3008
+	@$(MD5SUM) test.bin
+	$(TINYGO) build -size short -o test.bin -target=xiao-esp32s3   		examples/pwm
+	@$(MD5SUM) test.bin
+	$(TINYGO) build -size short -o test.bin -target=xiao-esp32s3   		examples/adc
+	@$(MD5SUM) test.bin
+	# esp32s3-supermini
+	$(TINYGO) build -size short -o test.bin -target=esp32s3-supermini	    examples/blinky1
+	@$(MD5SUM) test.bin
+	$(TINYGO) build -size short -o test.bin -target=esp32s3-supermini	    examples/blinkm
+	@$(MD5SUM) test.bin
+	$(TINYGO) build -size short -o test.bin -target=esp32s3-supermini	    examples/mcp3008
+	@$(MD5SUM) test.bin
+	$(TINYGO) build -size short -o test.bin -target=esp32s3-supermini   	examples/adc
+	@$(MD5SUM) test.bin
+	$(TINYGO) build -size short -o test.bin -target=esp32s3-box-3       examples/blinky1
+	@$(MD5SUM) test.bin
 endif
+    # esp32c3-supermini
+	$(TINYGO) build -size short -o test.bin -target=esp32c3-supermini	    examples/blinky1
+	@$(MD5SUM) test.bin
+	$(TINYGO) build -size short -o test.bin -target=esp32c3-supermini	    examples/blinkm
+	@$(MD5SUM) test.bin
+	$(TINYGO) build -size short -o test.bin -target=esp32c3-supermini	    examples/mcp3008
+	@$(MD5SUM) test.bin
+	$(TINYGO) build -size short -o test.bin -target=esp32c3-supermini   	examples/pwm
+	@$(MD5SUM) test.bin
+	$(TINYGO) build -size short -o test.bin -target=esp32c3-supermini   	examples/adc
+	@$(MD5SUM) test.bin
+
 	$(TINYGO) build -size short -o test.bin -target=esp-c3-32s-kit      examples/blinky1
 	@$(MD5SUM) test.bin
 	$(TINYGO) build -size short -o test.bin -target=qtpy-esp32c3        examples/machinetest
@@ -855,6 +1044,7 @@ endif
 	@$(MD5SUM) test.bin
 	$(TINYGO) build -size short -o test.bin -target=esp32c3-12f         examples/blinky1
 	@$(MD5SUM) test.bin
+
 	$(TINYGO) build -size short -o test.bin -target=makerfabs-esp32c3spi35 examples/machinetest
 	@$(MD5SUM) test.bin
 	$(TINYGO) build -size short -o test.hex -target=hifive1b            examples/blinky1
@@ -867,6 +1057,10 @@ endif
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=elecrow-rp2350      examples/blinky1
 	@$(MD5SUM) test.hex
+	$(TINYGO) build -size short -o test.hex -target=hw-651              examples/machinetest
+	@$(MD5SUM) test.hex
+	$(TINYGO) build -size short -o test.hex -target=hw-651-s110v8       examples/machinetest
+	@$(MD5SUM) test.hex
 ifneq ($(WASM), 0)
 	$(TINYGO) build -size short -o wasm.wasm -target=wasm               examples/wasm/export
 	$(TINYGO) build -size short -o wasm.wasm -target=wasm               examples/wasm/main
@@ -899,15 +1093,17 @@ endif


 wasmtest:
-	$(GO) test ./tests/wasm
+	cd ./tests/wasm && $(GO) test .

-build/release: tinygo gen-device wasi-libc $(if $(filter 1,$(USE_SYSTEM_BINARYEN)),,binaryen)
+build/release: tinygo gen-device $(if $(filter 1,$(USE_SYSTEM_BINARYEN)),,binaryen)
 	@mkdir -p build/release/tinygo/bin
+	@mkdir -p build/release/tinygo/lib/bdwgc
 	@mkdir -p build/release/tinygo/lib/clang/include
 	@mkdir -p build/release/tinygo/lib/CMSIS/CMSIS
 	@mkdir -p build/release/tinygo/lib/macos-minimal-sdk
+	@mkdir -p build/release/tinygo/lib/mingw-w64/mingw-w64-crt/crt
+	@mkdir -p build/release/tinygo/lib/mingw-w64/mingw-w64-crt/math
 	@mkdir -p build/release/tinygo/lib/mingw-w64/mingw-w64-crt/lib-common
-	@mkdir -p build/release/tinygo/lib/mingw-w64/mingw-w64-crt/stdio
 	@mkdir -p build/release/tinygo/lib/mingw-w64/mingw-w64-headers/defaults
 	@mkdir -p build/release/tinygo/lib/musl/arch
 	@mkdir -p build/release/tinygo/lib/musl/crt
@@ -915,7 +1111,8 @@ build/release: tinygo gen-device wasi-libc $(if $(filter 1,$(USE_SYSTEM_BINARYEN
 	@mkdir -p build/release/tinygo/lib/nrfx
 	@mkdir -p build/release/tinygo/lib/picolibc/newlib/libc
 	@mkdir -p build/release/tinygo/lib/picolibc/newlib/libm
-	@mkdir -p build/release/tinygo/lib/wasi-libc/libc-bottom-half/headers
+	@mkdir -p build/release/tinygo/lib/wasi-libc/dlmalloc
+	@mkdir -p build/release/tinygo/lib/wasi-libc/libc-bottom-half
 	@mkdir -p build/release/tinygo/lib/wasi-libc/libc-top-half/musl/arch
 	@mkdir -p build/release/tinygo/lib/wasi-libc/libc-top-half/musl/src
 	@mkdir -p build/release/tinygo/lib/wasi-cli/
@@ -924,6 +1121,7 @@ build/release: tinygo gen-device wasi-libc $(if $(filter 1,$(USE_SYSTEM_BINARYEN
 ifneq ($(USE_SYSTEM_BINARYEN),1)
 	@cp -p  build/wasm-opt$(EXE)         build/release/tinygo/bin
 endif
+	@cp -rp lib/bdwgc/*                  build/release/tinygo/lib/bdwgc
 	@cp -p $(abspath $(CLANG_SRC))/lib/Headers/*.h build/release/tinygo/lib/clang/include
 	@cp -rp lib/CMSIS/CMSIS/Include      build/release/tinygo/lib/CMSIS/CMSIS
 	@cp -rp lib/CMSIS/README.md          build/release/tinygo/lib/CMSIS
@@ -937,6 +1135,8 @@ endif
 	@cp -rp lib/musl/crt/crt1.c          build/release/tinygo/lib/musl/crt
 	@cp -rp lib/musl/COPYRIGHT           build/release/tinygo/lib/musl
 	@cp -rp lib/musl/include             build/release/tinygo/lib/musl
+	@cp -rp lib/musl/src/conf            build/release/tinygo/lib/musl/src
+	@cp -rp lib/musl/src/ctype           build/release/tinygo/lib/musl/src
 	@cp -rp lib/musl/src/env             build/release/tinygo/lib/musl/src
 	@cp -rp lib/musl/src/errno           build/release/tinygo/lib/musl/src
 	@cp -rp lib/musl/src/exit            build/release/tinygo/lib/musl/src
@@ -951,19 +1151,29 @@ endif
 	@cp -rp lib/musl/src/math            build/release/tinygo/lib/musl/src
 	@cp -rp lib/musl/src/misc            build/release/tinygo/lib/musl/src
 	@cp -rp lib/musl/src/multibyte       build/release/tinygo/lib/musl/src
+	@cp -rp lib/musl/src/sched           build/release/tinygo/lib/musl/src
 	@cp -rp lib/musl/src/signal          build/release/tinygo/lib/musl/src
 	@cp -rp lib/musl/src/stdio           build/release/tinygo/lib/musl/src
+	@cp -rp lib/musl/src/stdlib          build/release/tinygo/lib/musl/src
 	@cp -rp lib/musl/src/string          build/release/tinygo/lib/musl/src
 	@cp -rp lib/musl/src/thread          build/release/tinygo/lib/musl/src
 	@cp -rp lib/musl/src/time            build/release/tinygo/lib/musl/src
 	@cp -rp lib/musl/src/unistd          build/release/tinygo/lib/musl/src
 	@cp -rp lib/musl/src/process         build/release/tinygo/lib/musl/src
+	@cp -rp lib/mingw-w64/mingw-w64-crt/crt/pseudo-reloc.c          build/release/tinygo/lib/mingw-w64/mingw-w64-crt/crt
 	@cp -rp lib/mingw-w64/mingw-w64-crt/def-include                 build/release/tinygo/lib/mingw-w64/mingw-w64-crt
+	@cp -rp lib/mingw-w64/mingw-w64-crt/gdtoa                       build/release/tinygo/lib/mingw-w64/mingw-w64-crt
+	@cp -rp lib/mingw-w64/mingw-w64-crt/include                     build/release/tinygo/lib/mingw-w64/mingw-w64-crt
 	@cp -rp lib/mingw-w64/mingw-w64-crt/lib-common/api-ms-win-crt-* build/release/tinygo/lib/mingw-w64/mingw-w64-crt/lib-common
+	@cp -rp lib/mingw-w64/mingw-w64-crt/lib-common/advapi32.def.in  build/release/tinygo/lib/mingw-w64/mingw-w64-crt/lib-common
 	@cp -rp lib/mingw-w64/mingw-w64-crt/lib-common/kernel32.def.in  build/release/tinygo/lib/mingw-w64/mingw-w64-crt/lib-common
-	@cp -rp lib/mingw-w64/mingw-w64-crt/stdio/ucrt_*                build/release/tinygo/lib/mingw-w64/mingw-w64-crt/stdio
+	@cp -rp lib/mingw-w64/mingw-w64-crt/lib-common/msvcrt.def.in    build/release/tinygo/lib/mingw-w64/mingw-w64-crt/lib-common
+	@cp -rp lib/mingw-w64/mingw-w64-crt/math/x86                    build/release/tinygo/lib/mingw-w64/mingw-w64-crt/math
+	@cp -rp lib/mingw-w64/mingw-w64-crt/misc                        build/release/tinygo/lib/mingw-w64/mingw-w64-crt
+	@cp -rp lib/mingw-w64/mingw-w64-crt/stdio                       build/release/tinygo/lib/mingw-w64/mingw-w64-crt
 	@cp -rp lib/mingw-w64/mingw-w64-headers/crt/                    build/release/tinygo/lib/mingw-w64/mingw-w64-headers
 	@cp -rp lib/mingw-w64/mingw-w64-headers/defaults/include        build/release/tinygo/lib/mingw-w64/mingw-w64-headers/defaults
+	@cp -rp lib/mingw-w64/mingw-w64-headers/include                 build/release/tinygo/lib/mingw-w64/mingw-w64-headers
 	@cp -rp lib/nrfx/*                   build/release/tinygo/lib/nrfx
 	@cp -rp lib/picolibc/newlib/libc/ctype       build/release/tinygo/lib/picolibc/newlib/libc
 	@cp -rp lib/picolibc/newlib/libc/include     build/release/tinygo/lib/picolibc/newlib/libc
@@ -973,18 +1183,40 @@ endif
 	@cp -rp lib/picolibc/newlib/libm/common      build/release/tinygo/lib/picolibc/newlib/libm
 	@cp -rp lib/picolibc/newlib/libm/math        build/release/tinygo/lib/picolibc/newlib/libm
 	@cp -rp lib/picolibc-stdio.c         build/release/tinygo/lib
-	@cp -rp lib/wasi-libc/libc-bottom-half/headers/public           build/release/tinygo/lib/wasi-libc/libc-bottom-half/headers
+	@cp -rp lib/wasi-libc/dlmalloc/src                              build/release/tinygo/lib/wasi-libc/dlmalloc
+	@cp -rp lib/wasi-libc/libc-bottom-half/cloudlibc                build/release/tinygo/lib/wasi-libc/libc-bottom-half
+	@cp -rp lib/wasi-libc/libc-bottom-half/headers                  build/release/tinygo/lib/wasi-libc/libc-bottom-half
+	@cp -rp lib/wasi-libc/libc-bottom-half/sources                  build/release/tinygo/lib/wasi-libc/libc-bottom-half
+	@cp -rp lib/wasi-libc/libc-top-half/headers                     build/release/tinygo/lib/wasi-libc/libc-top-half
 	@cp -rp lib/wasi-libc/libc-top-half/musl/arch/generic           build/release/tinygo/lib/wasi-libc/libc-top-half/musl/arch
 	@cp -rp lib/wasi-libc/libc-top-half/musl/arch/wasm32            build/release/tinygo/lib/wasi-libc/libc-top-half/musl/arch
+	@cp -rp lib/wasi-libc/libc-top-half/musl/include                build/release/tinygo/lib/wasi-libc/libc-top-half/musl
+	@cp -rp lib/wasi-libc/libc-top-half/musl/src/conf               build/release/tinygo/lib/wasi-libc/libc-top-half/musl/src
+	@cp -rp lib/wasi-libc/libc-top-half/musl/src/dirent             build/release/tinygo/lib/wasi-libc/libc-top-half/musl/src
+	@cp -rp lib/wasi-libc/libc-top-half/musl/src/env                build/release/tinygo/lib/wasi-libc/libc-top-half/musl/src
+	@cp -rp lib/wasi-libc/libc-top-half/musl/src/errno              build/release/tinygo/lib/wasi-libc/libc-top-half/musl/src
+	@cp -rp lib/wasi-libc/libc-top-half/musl/src/exit               build/release/tinygo/lib/wasi-libc/libc-top-half/musl/src
+	@cp -rp lib/wasi-libc/libc-top-half/musl/src/fcntl              build/release/tinygo/lib/wasi-libc/libc-top-half/musl/src
+	@cp -rp lib/wasi-libc/libc-top-half/musl/src/fenv               build/release/tinygo/lib/wasi-libc/libc-top-half/musl/src
 	@cp -rp lib/wasi-libc/libc-top-half/musl/src/include            build/release/tinygo/lib/wasi-libc/libc-top-half/musl/src
 	@cp -rp lib/wasi-libc/libc-top-half/musl/src/internal           build/release/tinygo/lib/wasi-libc/libc-top-half/musl/src
+	@cp -rp lib/wasi-libc/libc-top-half/musl/src/legacy             build/release/tinygo/lib/wasi-libc/libc-top-half/musl/src
+	@cp -rp lib/wasi-libc/libc-top-half/musl/src/locale             build/release/tinygo/lib/wasi-libc/libc-top-half/musl/src
 	@cp -rp lib/wasi-libc/libc-top-half/musl/src/math               build/release/tinygo/lib/wasi-libc/libc-top-half/musl/src
+	@cp -rp lib/wasi-libc/libc-top-half/musl/src/misc               build/release/tinygo/lib/wasi-libc/libc-top-half/musl/src
+	@cp -rp lib/wasi-libc/libc-top-half/musl/src/multibyte          build/release/tinygo/lib/wasi-libc/libc-top-half/musl/src
+	@cp -rp lib/wasi-libc/libc-top-half/musl/src/network            build/release/tinygo/lib/wasi-libc/libc-top-half/musl/src
+	@cp -rp lib/wasi-libc/libc-top-half/musl/src/stat               build/release/tinygo/lib/wasi-libc/libc-top-half/musl/src
+	@cp -rp lib/wasi-libc/libc-top-half/musl/src/stdio              build/release/tinygo/lib/wasi-libc/libc-top-half/musl/src
+	@cp -rp lib/wasi-libc/libc-top-half/musl/src/stdlib             build/release/tinygo/lib/wasi-libc/libc-top-half/musl/src
 	@cp -rp lib/wasi-libc/libc-top-half/musl/src/string             build/release/tinygo/lib/wasi-libc/libc-top-half/musl/src
-	@cp -rp lib/wasi-libc/libc-top-half/musl/include                build/release/tinygo/lib/wasi-libc/libc-top-half/musl
-	@cp -rp lib/wasi-libc/sysroot                                   build/release/tinygo/lib/wasi-libc/sysroot
+	@cp -rp lib/wasi-libc/libc-top-half/musl/src/thread             build/release/tinygo/lib/wasi-libc/libc-top-half/musl/src
+	@cp -rp lib/wasi-libc/libc-top-half/musl/src/time               build/release/tinygo/lib/wasi-libc/libc-top-half/musl/src
+	@cp -rp lib/wasi-libc/libc-top-half/musl/src/unistd             build/release/tinygo/lib/wasi-libc/libc-top-half/musl/src
+	@cp -rp lib/wasi-libc/libc-top-half/sources                     build/release/tinygo/lib/wasi-libc/libc-top-half
 	@cp -rp lib/wasi-cli/wit                                        build/release/tinygo/lib/wasi-cli/wit
-	@cp -rp llvm-project/compiler-rt/lib/builtins build/release/tinygo/lib/compiler-rt-builtins
-	@cp -rp llvm-project/compiler-rt/LICENSE.TXT  build/release/tinygo/lib/compiler-rt-builtins
+	@cp -rp ${LLVM_PROJECTDIR}/compiler-rt/lib/builtins build/release/tinygo/lib/compiler-rt-builtins
+	@cp -rp ${LLVM_PROJECTDIR}/compiler-rt/LICENSE.TXT  build/release/tinygo/lib/compiler-rt-builtins
 	@cp -rp src                          build/release/tinygo/src
 	@cp -rp targets                      build/release/tinygo/targets

@@ -1006,8 +1238,9 @@ endif

 .PHONY: tools
 tools:
-	cd internal/tools && go generate -tags tools ./
+	go generate -tags tools ./

+LINTDIRS=src/os/ src/reflect/
 .PHONY: lint
 lint: tools ## Lint source tree
 	revive -version
@@ -1015,7 +1248,10 @@ lint: tools ## Lint source tree
 	# revive.toml isn't flexible enough to filter out just one kind of error from a checker, so do it with grep here.
 	# Can't use grep with friendly formatter.  Plain output isn't too bad, though.
 	# Use 'grep .' to get rid of stray blank line
-	revive -config revive.toml compiler/... src/{os,reflect}/*.go | grep -v "should have comment or be unexported" | grep '.' | awk '{print}; END {exit NR>0}'
+	revive -config revive.toml compiler/... $$( find $(LINTDIRS) -type f -name '*.go' ) \
+		| grep -v "should have comment or be unexported" \
+		| grep '.' \
+		| awk '{print}; END {exit NR>0}'

 SPELLDIRSCMD=find . -depth 1 -type d  | egrep -wv '.git|lib|llvm|src'; find src -depth 1 | egrep -wv 'device|internal|net|vendor'; find src/internal -depth 1 -type d | egrep -wv src/internal/wasi
 .PHONY: spell
@@ -1,7 +1,8 @@
-Copyright (c) 2018-2023 The TinyGo Authors. All rights reserved.
+Copyright (c) 2018-2026 The TinyGo Authors. All rights reserved.

 TinyGo includes portions of the Go standard library.
-Copyright (c) 2009-2023 The Go Authors. All rights reserved.
+Copyright 2009 The Go Authors. All rights reserved.
+See https://github.com/golang/go/blob/master/LICENSE for license information.

 TinyGo includes portions of LLVM, which is under the Apache License v2.0 with
 LLVM Exceptions. See https://llvm.org/LICENSE.txt for license information.
@@ -1,11 +1,14 @@
 # TinyGo - Go compiler for small places

-[![Linux](https://github.com/tinygo-org/tinygo/actions/workflows/linux.yml/badge.svg?branch=dev)](https://github.com/tinygo-org/tinygo/actions/workflows/linux.yml) [![macOS](https://github.com/tinygo-org/tinygo/actions/workflows/build-macos.yml/badge.svg?branch=dev)](https://github.com/tinygo-org/tinygo/actions/workflows/build-macos.yml) [![Windows](https://github.com/tinygo-org/tinygo/actions/workflows/windows.yml/badge.svg?branch=dev)](https://github.com/tinygo-org/tinygo/actions/workflows/windows.yml) [![Docker](https://github.com/tinygo-org/tinygo/actions/workflows/docker.yml/badge.svg?branch=dev)](https://github.com/tinygo-org/tinygo/actions/workflows/docker.yml) [![Nix](https://github.com/tinygo-org/tinygo/actions/workflows/nix.yml/badge.svg?branch=dev)](https://github.com/tinygo-org/tinygo/actions/workflows/nix.yml) [![CircleCI](https://circleci.com/gh/tinygo-org/tinygo/tree/dev.svg?style=svg)](https://circleci.com/gh/tinygo-org/tinygo/tree/dev)
+[![Linux](https://github.com/tinygo-org/tinygo/actions/workflows/linux.yml/badge.svg?branch=dev)](https://github.com/tinygo-org/tinygo/actions/workflows/linux.yml) [![macOS](https://github.com/tinygo-org/tinygo/actions/workflows/build-macos.yml/badge.svg?branch=dev)](https://github.com/tinygo-org/tinygo/actions/workflows/build-macos.yml) [![Windows](https://github.com/tinygo-org/tinygo/actions/workflows/windows.yml/badge.svg?branch=dev)](https://github.com/tinygo-org/tinygo/actions/workflows/windows.yml) [![Docker](https://github.com/tinygo-org/tinygo/actions/workflows/docker.yml/badge.svg?branch=dev)](https://github.com/tinygo-org/tinygo/actions/workflows/docker.yml) [![Nix](https://github.com/tinygo-org/tinygo/actions/workflows/nix.yml/badge.svg?branch=dev)](https://github.com/tinygo-org/tinygo/actions/workflows/nix.yml)

 TinyGo is a Go compiler intended for use in small places such as microcontrollers, WebAssembly (wasm/wasi), and command-line tools.

 It reuses libraries used by the [Go language tools](https://golang.org/pkg/go/) alongside [LLVM](http://llvm.org) to provide an alternative way to compile programs written in the Go programming language.

+> [!IMPORTANT]
+> You can help TinyGo with a financial contribution using OpenCollective. Please see https://opencollective.com/tinygo for more information. Thank you!
+
 ## Embedded

 Here is an example program that blinks the built-in LED when run directly on any supported board with onboard LED:
@@ -31,10 +34,10 @@ func main() {
 }
 ```

-The above program can be compiled and run without modification on an Arduino Uno, an Adafruit ItsyBitsy M0, or any of the supported boards that have a built-in LED, just by setting the correct TinyGo compiler target. For example, this compiles and flashes an Arduino Uno:
+The above program can be compiled and run without modification on an [Arduino Uno](https://tinygo.org/docs/reference/microcontrollers/boards/arduino-uno), an [Adafruit Circuit Playground Express](https://tinygo.org/docs/reference/microcontrollers/featured/circuitplay-express), a [Seeed Studio XIAO-ESP32S3](https://tinygo.org/docs/reference/microcontrollers/featured/xiao-esp32s3) or any of the many supported boards that have a built-in LED, just by setting the correct TinyGo compiler target. For example, this compiles and flashes an Arduino Uno:

 ```shell
-tinygo flash -target arduino examples/blinky1
+tinygo flash -target arduino-uno examples/blinky1
 ```

 ## WebAssembly
@@ -48,20 +51,22 @@ Here is a small TinyGo program for use by a WASI host application:
 ```go
 package main

-//go:wasm-module yourmodulename
-//export add
+//go:wasmexport add
 func add(x, y uint32) uint32 {
 	return x + y
 }
-
-// main is required for the `wasip1` target, even if it isn't used.
-func main() {}
 ```

-This compiles the above TinyGo program for use on any WASI runtime:
+This compiles the above TinyGo program for use on any WASI Preview 1 runtime:

 ```shell
-tinygo build -o main.wasm -target=wasip1 main.go
+tinygo build -buildmode=c-shared -o add.wasm -target=wasip1 add.go
+```
+
+You can also use the same syntax as Go 1.24+:
+
+```shell
+GOOS=wasip1 GOARCH=wasm tinygo build -buildmode=c-shared -o add.wasm add.go
 ```

 ## Installation
@@ -72,7 +77,7 @@ See the [getting started instructions](https://tinygo.org/getting-started/) for

 ### Embedded

-You can compile TinyGo programs for over 94 different microcontroller boards.
+You can compile TinyGo programs for over 150 different microcontroller boards.

 For more information, please see https://tinygo.org/docs/reference/microcontrollers/

@@ -137,7 +142,7 @@ Non-goals:

 ## Why this project exists

-> We never expected Go to be an embedded language and so its got serious problems...
+> We never expected Go to be an embedded language, and so it’s got serious problems...

 -- Rob Pike, [GopherCon 2014 Opening Keynote](https://www.youtube.com/watch?v=VoS7DsT1rdM&feature=youtu.be&t=2799)

@@ -3,6 +3,7 @@ package builder
 import (
 	"bytes"
 	"debug/elf"
+	"debug/macho"
 	"debug/pe"
 	"encoding/binary"
 	"errors"
@@ -62,6 +63,20 @@ func makeArchive(arfile *os.File, objs []string) error {
 					fileIndex int
 				}{symbol.Name, i})
 			}
+		} else if dbg, err := macho.NewFile(objfile); err == nil {
+			for _, symbol := range dbg.Symtab.Syms {
+				// See mach-o/nlist.h
+				if symbol.Type&0x0e != 0xe { // (symbol.Type & N_TYPE) != N_SECT
+					continue // undefined symbol
+				}
+				if symbol.Type&0x01 == 0 { // (symbol.Type & N_EXT) == 0
+					continue // internal symbol (static, etc)
+				}
+				symbolTable = append(symbolTable, struct {
+					name      string
+					fileIndex int
+				}{symbol.Name, i})
+			}
 		} else if dbg, err := pe.NewFile(objfile); err == nil {
 			for _, symbol := range dbg.Symbols {
 				if symbol.StorageClass != 2 {
@@ -0,0 +1,91 @@
+package builder
+
+// The well-known conservative Boehm-Demers-Weiser GC.
+// This file provides a way to compile this GC for use with TinyGo.
+
+import (
+	"path/filepath"
+	"strings"
+
+	"github.com/tinygo-org/tinygo/goenv"
+)
+
+var BoehmGC = Library{
+	name: "bdwgc",
+	cflags: func(target, headerPath string) []string {
+		libdir := filepath.Join(goenv.Get("TINYGOROOT"), "lib/bdwgc")
+		flags := []string{
+			// use a modern environment
+			"-DUSE_MMAP",              // mmap is available
+			"-DUSE_MUNMAP",            // return memory to the OS using munmap
+			"-DGC_BUILTIN_ATOMIC",     // use compiler intrinsics for atomic operations
+			"-DNO_EXECUTE_PERMISSION", // don't make the heap executable
+
+			// specific flags for TinyGo
+			"-DALL_INTERIOR_POINTERS",  // scan interior pointers (needed for Go)
+			"-DIGNORE_DYNAMIC_LOADING", // we don't support dynamic loading at the moment
+			"-DNO_GETCONTEXT",          // musl doesn't support getcontext()
+			"-DGC_DISABLE_INCREMENTAL", // don't mess with SIGSEGV and such
+
+			// Use a minimal environment.
+			"-DNO_MSGBOX_ON_ERROR", // don't call MessageBoxA on Windows
+			"-DDONT_USE_ATEXIT",
+			"-DNO_GETENV",          // smaller binary, more predictable configuration
+			"-DNO_CLOCK",           // don't use system clock
+			"-DNO_DEBUGGING",       // reduce code size
+			"-DGC_NO_FINALIZATION", // finalization is not used at the moment
+
+			// Special flag to work around the lack of __data_start in ld.lld.
+			// TODO: try to fix this in LLVM/lld directly so we don't have to
+			// work around it anymore.
+			"-DGC_DONT_REGISTER_MAIN_STATIC_DATA",
+
+			// Do not scan the stack. We have our own mechanism to do this.
+			"-DSTACK_NOT_SCANNED",
+			"-DNO_PROC_STAT",  // we scan the stack manually (don't read /proc/self/stat on Linux)
+			"-DSTACKBOTTOM=0", // dummy value, we scan the stack manually
+
+			// Assertions can be enabled while debugging GC issues.
+			//"-DGC_ASSERTIONS",
+
+			// We use our own way of dealing with threads (that is a bit hacky).
+			// See src/runtime/gc_boehm.go.
+			//"-DGC_THREADS",
+			//"-DTHREAD_LOCAL_ALLOC",
+
+			"-I" + libdir + "/include",
+		}
+		return flags
+	},
+	needsLibc: true,
+	sourceDir: func() string {
+		return filepath.Join(goenv.Get("TINYGOROOT"), "lib/bdwgc")
+	},
+	librarySources: func(target string, _ bool) ([]string, error) {
+		sources := []string{
+			"allchblk.c",
+			"alloc.c",
+			"blacklst.c",
+			"dbg_mlc.c",
+			"dyn_load.c",
+			"headers.c",
+			"mach_dep.c",
+			"malloc.c",
+			"mark.c",
+			"mark_rts.c",
+			"misc.c",
+			"new_hblk.c",
+			"os_dep.c",
+			"reclaim.c",
+		}
+		if strings.Split(target, "-")[2] == "windows" {
+			// Due to how the linker on Windows works (that doesn't allow
+			// undefined functions), we need to include these extra files.
+			sources = append(sources,
+				"mallocx.c",
+				"ptr_chck.c",
+			)
+		}
+		return sources, nil
+	},
+}
@@ -14,12 +14,13 @@ import (
 	"fmt"
 	"go/types"
 	"hash/crc32"
-	"io/fs"
+	"maps"
 	"math/bits"
 	"os"
 	"os/exec"
 	"path/filepath"
 	"runtime"
+	"slices"
 	"sort"
 	"strconv"
 	"strings"
@@ -137,9 +138,7 @@ func Build(pkgName, outpath, tmpdir string, config *compileopts.Config) (BuildRe
 		if _, ok := globalValues[pkgPath]; !ok {
 			globalValues[pkgPath] = map[string]string{}
 		}
-		for k, v := range vals {
-			globalValues[pkgPath][k] = v
-		}
+		maps.Copy(globalValues[pkgPath], vals)
 	}

 	// Check for a libc dependency.
@@ -149,16 +148,17 @@ func Build(pkgName, outpath, tmpdir string, config *compileopts.Config) (BuildRe
 	var libcDependencies []*compileJob
 	switch config.Target.Libc {
 	case "darwin-libSystem":
-		job := makeDarwinLibSystemJob(config, tmpdir)
-		libcDependencies = append(libcDependencies, job)
+		libcJob := makeDarwinLibSystemJob(config, tmpdir)
+		libcDependencies = append(libcDependencies, libcJob)
 	case "musl":
-		job, unlock, err := libMusl.load(config, tmpdir)
+		var unlock func()
+		libcJob, unlock, err := libMusl.load(config, tmpdir)
 		if err != nil {
 			return BuildResult{}, err
 		}
 		defer unlock()
-		libcDependencies = append(libcDependencies, dummyCompileJob(filepath.Join(filepath.Dir(job.result), "crt1.o")))
-		libcDependencies = append(libcDependencies, job)
+		libcDependencies = append(libcDependencies, dummyCompileJob(filepath.Join(filepath.Dir(libcJob.result), "crt1.o")))
+		libcDependencies = append(libcDependencies, libcJob)
 	case "picolibc":
 		libcJob, unlock, err := libPicolibc.load(config, tmpdir)
 		if err != nil {
@@ -167,11 +167,12 @@ func Build(pkgName, outpath, tmpdir string, config *compileopts.Config) (BuildRe
 		defer unlock()
 		libcDependencies = append(libcDependencies, libcJob)
 	case "wasi-libc":
-		path := filepath.Join(root, "lib/wasi-libc/sysroot/lib/wasm32-wasi/libc.a")
-		if _, err := os.Stat(path); errors.Is(err, fs.ErrNotExist) {
-			return BuildResult{}, errors.New("could not find wasi-libc, perhaps you need to run `make wasi-libc`?")
+		libcJob, unlock, err := libWasiLibc.load(config, tmpdir)
+		if err != nil {
+			return BuildResult{}, err
 		}
-		libcDependencies = append(libcDependencies, dummyCompileJob(path))
+		defer unlock()
+		libcDependencies = append(libcDependencies, libcJob)
 	case "wasmbuiltins":
 		libcJob, unlock, err := libWasmBuiltins.load(config, tmpdir)
 		if err != nil {
@@ -180,12 +181,12 @@ func Build(pkgName, outpath, tmpdir string, config *compileopts.Config) (BuildRe
 		defer unlock()
 		libcDependencies = append(libcDependencies, libcJob)
 	case "mingw-w64":
-		job, unlock, err := libMinGW.load(config, tmpdir)
+		libcJob, unlock, err := libMinGW.load(config, tmpdir)
 		if err != nil {
 			return BuildResult{}, err
 		}
 		defer unlock()
-		libcDependencies = append(libcDependencies, job)
+		libcDependencies = append(libcDependencies, libcJob)
 		libcDependencies = append(libcDependencies, makeMinGWExtraLibs(tmpdir, config.GOARCH())...)
 	case "":
 		// no library specified, so nothing to do
@@ -213,6 +214,7 @@ func Build(pkgName, outpath, tmpdir string, config *compileopts.Config) (BuildRe
 		MaxStackAlloc:      config.MaxStackAlloc(),
 		NeedsStackObjects:  config.NeedsStackObjects(),
 		Debug:              !config.Options.SkipDWARF, // emit DWARF except when -internal-nodwarf is passed
+		Nobounds:           config.Options.Nobounds,
 		PanicStrategy:      config.PanicStrategy(),
 	}

@@ -252,6 +254,18 @@ func Build(pkgName, outpath, tmpdir string, config *compileopts.Config) (BuildRe
 		result.PackagePathMap[pkg.OriginalDir()] = pkg.Pkg.Path()
 	}

+	// Strip default initializers for -X globals from the type info before
+	// building SSA. This prevents go/ssa from emitting init stores for them,
+	// so that makeGlobalsModule can supply the correct values at final link
+	// time without any runtime init overwriting them. The -X values themselves
+	// are kept out of the per-package build cache; only the variable names
+	// appear in the cache key.
+	for _, pkg := range lprogram.Sorted() {
+		for name := range globalValues[pkg.Pkg.Path()] {
+			pkg.StripVarInitializer(name)
+		}
+	}
+
 	// Create the *ssa.Program. This does not yet build the entire SSA of the
 	// program so it's pretty fast and doesn't need to be parallelized.
 	program := lprogram.LoadSSA()
@@ -263,7 +277,6 @@ func Build(pkgName, outpath, tmpdir string, config *compileopts.Config) (BuildRe

 	var embedFileObjects []*compileJob
 	for _, pkg := range lprogram.Sorted() {
-		pkg := pkg // necessary to avoid a race condition

 		var undefinedGlobals []string
 		for name := range globalValues[pkg.Pkg.Path()] {
@@ -279,9 +292,13 @@ func Build(pkgName, outpath, tmpdir string, config *compileopts.Config) (BuildRe
 				allFiles[file.Name] = append(allFiles[file.Name], file)
 			}
 		}
-		for name, files := range allFiles {
-			name := name
-			files := files
+		// Sort embedded files by name to maintain output determinism.
+		embedNames := make([]string, 0, len(allFiles))
+		for _, files := range allFiles {
+			embedNames = append(embedNames, files[0].Name)
+		}
+		slices.Sort(embedNames)
+		for _, name := range embedNames {
 			job := &compileJob{
 				description: "make object file for " + name,
 				run: func(job *compileJob) error {
@@ -296,7 +313,7 @@ func Build(pkgName, outpath, tmpdir string, config *compileopts.Config) (BuildRe
 					sum := sha256.Sum256(data)
 					hexSum := hex.EncodeToString(sum[:16])

-					for _, file := range files {
+					for _, file := range allFiles[name] {
 						file.Size = uint64(len(data))
 						file.Hash = hexSum
 						if file.NeedsData {
@@ -449,8 +466,15 @@ func Build(pkgName, outpath, tmpdir string, config *compileopts.Config) (BuildRe
 					if global.IsNil() {
 						return errors.New("global not found: " + globalName)
 					}
+					globalType := global.GlobalValueType()
+					if globalType.TypeKind() != llvm.StructTypeKind || globalType.StructName() != "runtime._string" {
+						// Verify this is indeed a string. This is needed so
+						// that makeGlobalsModule can just create the right
+						// globals of string type without checking.
+						return fmt.Errorf("%s: not a string", globalName)
+					}
 					name := global.Name()
-					newGlobal := llvm.AddGlobal(mod, global.GlobalValueType(), name+".tmp")
+					newGlobal := llvm.AddGlobal(mod, globalType, name+".tmp")
 					global.ReplaceAllUsesWith(newGlobal)
 					global.EraseFromParentAsGlobal()
 					newGlobal.SetName(name)
@@ -463,7 +487,7 @@ func Build(pkgName, outpath, tmpdir string, config *compileopts.Config) (BuildRe
 				if pkgInit.IsNil() {
 					panic("init not found for " + pkg.Pkg.Path())
 				}
-				err := interp.RunFunc(pkgInit, config.Options.InterpTimeout, config.DumpSSA())
+				err := interp.RunFunc(pkgInit, config.Options.InterpTimeout, config.Options.InterpMaxLoopIterations, config.DumpSSA())
 				if err != nil {
 					return err
 				}
@@ -532,12 +556,38 @@ func Build(pkgName, outpath, tmpdir string, config *compileopts.Config) (BuildRe
 				if err != nil {
 					return fmt.Errorf("failed to load bitcode file: %w", err)
 				}
+				// Resolve duplicate function definitions before linking.
+				// This can happen when a newer Go version adds a function
+				// body in a standard library package that was previously
+				// just a declaration provided by //go:linkname from the
+				// runtime. In that case, keep the existing (runtime)
+				// definition by weakening the new one's linkage so the
+				// LLVM linker discards it in favor of the existing one.
+				for fn := pkgMod.FirstFunction(); !fn.IsNil(); fn = llvm.NextFunction(fn) {
+					if fn.IsDeclaration() {
+						continue
+					}
+					existing := mod.NamedFunction(fn.Name())
+					if existing.IsNil() || existing.IsDeclaration() {
+						continue
+					}
+					fn.SetLinkage(llvm.LinkOnceODRLinkage)
+				}
 				err = llvm.LinkModules(mod, pkgMod)
 				if err != nil {
 					return fmt.Errorf("failed to link module: %w", err)
 				}
 			}

+			// Insert values from -ldflags="-X ..." into the IR.
+			// This is a separate module, so that the "runtime._string" type
+			// doesn't need to match precisely. LLVM tends to rename that type
+			// sometimes, leading to errors. But linking in a separate module
+			// works fine. See:
+			// https://github.com/tinygo-org/tinygo/issues/4810
+			globalsMod := makeGlobalsModule(ctx, globalValues, machine)
+			llvm.LinkModules(mod, globalsMod)
+
 			// Create runtime.initAll function that calls the runtime
 			// initializer of each package.
 			llvmInitFn := mod.NamedFunction("runtime.initAll")
@@ -590,7 +640,7 @@ func Build(pkgName, outpath, tmpdir string, config *compileopts.Config) (BuildRe

 			// Run all optimization passes, which are much more effective now
 			// that the optimizer can see the whole program at once.
-			err := optimizeProgram(mod, config, globalValues)
+			err := optimizeProgram(mod, config)
 			if err != nil {
 				return err
 			}
@@ -604,6 +654,11 @@ func Build(pkgName, outpath, tmpdir string, config *compileopts.Config) (BuildRe
 		},
 	}

+	// Create the output directory, if needed
+	if err := os.MkdirAll(filepath.Dir(outpath), 0777); err != nil {
+		return result, err
+	}
+
 	// Check whether we only need to create an object file.
 	// If so, we don't need to link anything and will be finished quickly.
 	outext := filepath.Ext(outpath)
@@ -667,6 +722,16 @@ func Build(pkgName, outpath, tmpdir string, config *compileopts.Config) (BuildRe
 		ldflags = append(ldflags, "--no-entry")
 	}

+	if config.Options.BuildMode == "wasi-legacy" {
+		if !strings.HasPrefix(config.Triple(), "wasm32-") {
+			return result, fmt.Errorf("buildmode wasi-legacy is only supported on wasm")
+		}
+
+		if config.Options.Scheduler != "none" {
+			return result, fmt.Errorf("buildmode wasi-legacy only supports scheduler=none")
+		}
+	}
+
 	// Add compiler-rt dependency if needed. Usually this is a simple load from
 	// a cache.
 	if config.Target.RTLib == "compiler-rt" {
@@ -678,6 +743,16 @@ func Build(pkgName, outpath, tmpdir string, config *compileopts.Config) (BuildRe
 		linkerDependencies = append(linkerDependencies, job)
 	}

+	// The Boehm collector is stored in a separate C library.
+	if config.GC() == "boehm" {
+		job, unlock, err := BoehmGC.load(config, tmpdir)
+		if err != nil {
+			return BuildResult{}, err
+		}
+		defer unlock()
+		linkerDependencies = append(linkerDependencies, job)
+	}
+
 	// Add jobs to compile extra files. These files are in C or assembly and
 	// contain things like the interrupt vector table and low level operations
 	// such as stack switching.
@@ -698,7 +773,6 @@ func Build(pkgName, outpath, tmpdir string, config *compileopts.Config) (BuildRe
 	// TODO: do this as part of building the package to be able to link the
 	// bitcode files together.
 	for _, pkg := range lprogram.Sorted() {
-		pkg := pkg
 		for _, filename := range pkg.CFiles {
 			abspath := filepath.Join(pkg.OriginalDir(), filename)
 			job := &compileJob{
@@ -765,22 +839,25 @@ func Build(pkgName, outpath, tmpdir string, config *compileopts.Config) (BuildRe
 			}
 			ldflags = append(ldflags, "-mllvm", "-mcpu="+config.CPU())
 			ldflags = append(ldflags, "-mllvm", "-mattr="+config.Features()) // needed for MIPS softfloat
-			if config.GOOS() == "windows" {
-				// Options for the MinGW wrapper for the lld COFF linker.
+			switch config.LinkerFlavor() {
+			case "coff":
+				// Options for driving ld.lld in PE/COFF mode.
 				ldflags = append(ldflags,
 					"-Xlink=/opt:lldlto="+strconv.Itoa(speedLevel),
 					"--thinlto-cache-dir="+filepath.Join(cacheDir, "thinlto"))
-			} else if config.GOOS() == "darwin" {
+			case "darwin":
 				// Options for the ld64-compatible lld linker.
 				ldflags = append(ldflags,
 					"--lto-O"+strconv.Itoa(speedLevel),
 					"-cache_path_lto", filepath.Join(cacheDir, "thinlto"))
-			} else {
+			case "gnu":
 				// Options for the ELF linker.
 				ldflags = append(ldflags,
 					"--lto-O"+strconv.Itoa(speedLevel),
 					"--thinlto-cache-dir="+filepath.Join(cacheDir, "thinlto"),
 				)
+			default:
+				return fmt.Errorf("unknown linker flavor: %s", config.LinkerFlavor())
 			}
 			if config.CodeModel() != "default" {
 				ldflags = append(ldflags,
@@ -837,7 +914,7 @@ func Build(pkgName, outpath, tmpdir string, config *compileopts.Config) (BuildRe
 			}

 			// Run wasm-opt for wasm binaries
-			if arch := strings.Split(config.Triple(), "-")[0]; arch == "wasm32" {
+			if arch, _, _ := strings.Cut(config.Triple(), "-"); arch == "wasm32" {
 				optLevel, _, _ := config.OptLevel()
 				opt := "-" + optLevel

@@ -999,11 +1076,11 @@ func Build(pkgName, outpath, tmpdir string, config *compileopts.Config) (BuildRe
 		if err != nil {
 			return result, err
 		}
-	case "esp32", "esp32-img", "esp32c3", "esp8266":
+	case "esp32", "esp32-img", "esp32c3", "esp32s3", "esp32c6", "esp8266":
 		// Special format for the ESP family of chips (parsed by the ROM
 		// bootloader).
 		result.Binary = filepath.Join(tmpdir, "main"+outext)
-		err := makeESPFirmareImage(result.Executable, result.Binary, outputBinaryFormat)
+		err := makeESPFirmwareImage(result.Executable, result.Binary, outputBinaryFormat)
 		if err != nil {
 			return result, err
 		}
@@ -1130,8 +1207,8 @@ func createEmbedObjectFile(data, hexSum, sourceFile, sourceDir, tmpdir string, c
 // optimizeProgram runs a series of optimizations and transformations that are
 // needed to convert a program to its final form. Some transformations are not
 // optional and must be run as the compiler expects them to run.
-func optimizeProgram(mod llvm.Module, config *compileopts.Config, globalValues map[string]map[string]string) error {
-	err := interp.Run(mod, config.Options.InterpTimeout, config.DumpSSA())
+func optimizeProgram(mod llvm.Module, config *compileopts.Config) error {
+	err := interp.Run(mod, config.Options.InterpTimeout, config.Options.InterpMaxLoopIterations, config.DumpSSA())
 	if err != nil {
 		return err
 	}
@@ -1148,12 +1225,6 @@ func optimizeProgram(mod llvm.Module, config *compileopts.Config, globalValues m
 		}
 	}

-	// Insert values from -ldflags="-X ..." into the IR.
-	err = setGlobalValues(mod, globalValues)
-	if err != nil {
-		return err
-	}
-
 	// Run most of the whole-program optimizations (including the whole
 	// O0/O1/O2/Os/Oz optimization pipeline).
 	errs := transform.Optimize(mod, config)
@@ -1167,10 +1238,19 @@ func optimizeProgram(mod llvm.Module, config *compileopts.Config, globalValues m
 	return nil
 }

-// setGlobalValues sets the global values from the -ldflags="-X ..." compiler
-// option in the given module. An error may be returned if the global is not of
-// the expected type.
-func setGlobalValues(mod llvm.Module, globals map[string]map[string]string) error {
+func makeGlobalsModule(ctx llvm.Context, globals map[string]map[string]string, machine llvm.TargetMachine) llvm.Module {
+	mod := ctx.NewModule("cmdline-globals")
+	targetData := machine.CreateTargetData()
+	defer targetData.Dispose()
+	mod.SetDataLayout(targetData.String())
+
+	stringType := ctx.StructCreateNamed("runtime._string")
+	uintptrType := ctx.IntType(targetData.PointerSize() * 8)
+	stringType.StructSetBody([]llvm.Type{
+		llvm.PointerType(ctx.Int8Type(), 0),
+		uintptrType,
+	}, false)
+
 	var pkgPaths []string
 	for pkgPath := range globals {
 		pkgPaths = append(pkgPaths, pkgPath)
@@ -1186,24 +1266,6 @@ func setGlobalValues(mod llvm.Module, globals map[string]map[string]string) erro
 		for _, name := range names {
 			value := pkg[name]
 			globalName := pkgPath + "." + name
-			global := mod.NamedGlobal(globalName)
-			if global.IsNil() || !global.Initializer().IsNil() {
-				// The global either does not exist (optimized away?) or has
-				// some value, in which case it has already been initialized at
-				// package init time.
-				continue
-			}
-
-			// A strin is a {ptr, len} pair. We need these types to build the
-			// initializer.
-			initializerType := global.GlobalValueType()
-			if initializerType.TypeKind() != llvm.StructTypeKind || initializerType.StructName() == "" {
-				return fmt.Errorf("%s: not a string", globalName)
-			}
-			elementTypes := initializerType.StructElementTypes()
-			if len(elementTypes) != 2 {
-				return fmt.Errorf("%s: not a string", globalName)
-			}

 			// Create a buffer for the string contents.
 			bufInitializer := mod.Context().ConstString(value, false)
@@ -1214,22 +1276,20 @@ func setGlobalValues(mod llvm.Module, globals map[string]map[string]string) erro
 			buf.SetLinkage(llvm.PrivateLinkage)

 			// Create the string value, which is a {ptr, len} pair.
-			zero := llvm.ConstInt(mod.Context().Int32Type(), 0, false)
-			ptr := llvm.ConstGEP(bufInitializer.Type(), buf, []llvm.Value{zero, zero})
-			if ptr.Type() != elementTypes[0] {
-				return fmt.Errorf("%s: not a string", globalName)
-			}
-			length := llvm.ConstInt(elementTypes[1], uint64(len(value)), false)
-			initializer := llvm.ConstNamedStruct(initializerType, []llvm.Value{
-				ptr,
+			length := llvm.ConstInt(uintptrType, uint64(len(value)), false)
+			initializer := llvm.ConstNamedStruct(stringType, []llvm.Value{
+				buf,
 				length,
 			})

-			// Set the initializer. No initializer should be set at this point.
+			// Create the string global.
+			global := llvm.AddGlobal(mod, stringType, globalName)
 			global.SetInitializer(initializer)
+			global.SetAlignment(targetData.PrefTypeAlignment(stringType))
 		}
 	}
-	return nil
+
+	return mod
 }

 // functionStackSizes keeps stack size information about a single function
@@ -1292,6 +1352,14 @@ func determineStackSizes(mod llvm.Module, executable string) ([]string, map[stri
 	}
 	baseStackSize, baseStackSizeType, baseStackSizeFailedAt := functions["tinygo_startTask"][0].StackSize()

+	// Account for the bytes that tinygo_swapTask pushes onto the goroutine stack
+	// on every context switch. The static analysis correctly traces Go calls,
+	// but it cannot see into the assembly-level register push.
+	var contextSwitchOverhead uint64
+	if swapFuncs, ok := functions["tinygo_swapTask"]; ok && len(swapFuncs) == 1 {
+		contextSwitchOverhead = swapFuncs[0].FrameSize
+	}
+
 	sizes := make(map[string]functionStackSize)

 	// Add the reset handler function, for convenience. The reset handler runs
@@ -1340,6 +1408,12 @@ func determineStackSizes(mod llvm.Module, executable string) ([]string, map[stri
 			// overflow will occur even before the goroutine is started.
 			stackSize = baseStackSize
 		}
+		if stackSizeType == stacksize.Bounded {
+			// Add the overhead of context switching. This is needed because the
+			// context switch (tinygo_swapTask) pushes callee-saved registers
+			// onto the current stack, which is not seen by the static analysis.
+			stackSize += contextSwitchOverhead
+		}
 		sizes[name] = functionStackSize{
 			stackSize:        stackSize,
 			stackSizeType:    stackSizeType,
@@ -5,6 +5,7 @@ import (
 	"os"
 	"path/filepath"
 	"runtime"
+	"strings"
 	"testing"

 	"github.com/tinygo-org/tinygo/compileopts"
@@ -28,12 +29,15 @@ func TestClangAttributes(t *testing.T) {
 		"cortex-m4",
 		"cortex-m7",
 		"esp32c3",
+		"esp32c6",
+		"esp32s3",
 		"fe310",
 		"gameboy-advance",
 		"k210",
 		"nintendoswitch",
 		"riscv-qemu",
 		"tkey",
+		"uefi-amd64",
 		"wasip1",
 		"wasip2",
 		"wasm",
@@ -45,7 +49,6 @@ func TestClangAttributes(t *testing.T) {
 		targetNames = append(targetNames, "esp32", "esp8266")
 	}
 	for _, targetName := range targetNames {
-		targetName := targetName
 		t.Run(targetName, func(t *testing.T) {
 			testClangAttributes(t, &compileopts.Options{Target: targetName})
 		})
@@ -67,9 +70,9 @@ func TestClangAttributes(t *testing.T) {
 		{GOOS: "linux", GOARCH: "mipsle", GOMIPS: "softfloat"},
 		{GOOS: "darwin", GOARCH: "amd64"},
 		{GOOS: "darwin", GOARCH: "arm64"},
+		{GOOS: "windows", GOARCH: "386"},
 		{GOOS: "windows", GOARCH: "amd64"},
 		{GOOS: "windows", GOARCH: "arm64"},
-		{GOOS: "wasip1", GOARCH: "wasm"},
 	} {
 		name := "GOOS=" + options.GOOS + ",GOARCH=" + options.GOARCH
 		if options.GOARCH == "arm" {
@@ -127,8 +130,10 @@ func testClangAttributes(t *testing.T, options *compileopts.Options) {
 	defer mod.Dispose()

 	// Check whether the LLVM target matches.
-	if mod.Target() != config.Triple() {
-		t.Errorf("target has LLVM triple %#v but Clang makes it LLVM triple %#v", config.Triple(), mod.Target())
+	// Use ClangTriple since LLVM 22 normalizes wasm32-unknown-wasi to wasip1.
+	expectedTriple := compileopts.ClangTriple(config.Triple())
+	if mod.Target() != expectedTriple {
+		t.Errorf("target has LLVM triple %#v but Clang makes it LLVM triple %#v", expectedTriple, mod.Target())
 	}

 	// Check the "target-cpu" and "target-features" string attribute of the add
@@ -152,11 +157,65 @@ func testClangAttributes(t *testing.T, options *compileopts.Options) {
 			// The reason is that Debian has patched Clang in a way that
 			// modifies the LLVM features string, changing lots of FPU/float
 			// related flags. We want to test vanilla Clang, not Debian Clang.
-			t.Errorf("target has LLVM features\n\t%#v\nbut Clang makes it\n\t%#v", config.Features(), features)
+			//
+			// Rather than requiring an exact match (which breaks across LLVM
+			// versions as new features are added), check that every feature
+			// TinyGo specifies is consistent with what Clang produces:
+			//  - A "+feature" in TinyGo must appear in Clang's output.
+			//  - A "-feature" in TinyGo must not be "+feature" in Clang's output.
+			checkFeatureFlags(t, config.Features(), features)
 		}
 	}
 }

+// checkFeatureFlags verifies that all features specified by TinyGo's target
+// configuration are consistent with Clang's output. This allows Clang to add
+// new features across LLVM versions without breaking the test.
+func checkFeatureFlags(t *testing.T, targetFeatures, clangFeatures string) {
+	t.Helper()
+
+	// Build a set of Clang's features for fast lookup.
+	clangSet := make(map[string]bool) // feature name -> enabled
+	for _, f := range strings.Split(clangFeatures, ",") {
+		f = strings.TrimSpace(f)
+		if len(f) < 2 {
+			continue
+		}
+		enabled := f[0] == '+'
+		name := f[1:]
+		clangSet[name] = enabled
+	}
+
+	// Check each feature that TinyGo specifies.
+	var missing, conflicts []string
+	for _, f := range strings.Split(targetFeatures, ",") {
+		f = strings.TrimSpace(f)
+		if len(f) < 2 {
+			continue
+		}
+		wantEnabled := f[0] == '+'
+		name := f[1:]
+
+		clangEnabled, inClang := clangSet[name]
+		if wantEnabled && (!inClang || !clangEnabled) {
+			// TinyGo requires +feature but Clang doesn't enable it.
+			missing = append(missing, f)
+		} else if !wantEnabled && inClang && clangEnabled {
+			// TinyGo requires -feature but Clang enables it.
+			conflicts = append(conflicts, fmt.Sprintf("target has %q but Clang has %q", f, "+"+name))
+		}
+	}
+
+	if len(missing) > 0 {
+		t.Errorf("target specifies features not present in Clang output: %s\n\ttarget features: %s\n\tclang features:  %s",
+			strings.Join(missing, ", "), targetFeatures, clangFeatures)
+	}
+	if len(conflicts) > 0 {
+		t.Errorf("target disables features that Clang enables: %s",
+			strings.Join(conflicts, "; "))
+	}
+}
+
 // This TestMain is necessary because TinyGo may also be invoked to run certain
 // LLVM tools in a separate process. Not capturing these invocations would lead
 // to recursive tests.
@@ -3,6 +3,7 @@ package builder
 import (
 	"os"
 	"path/filepath"
+	"strings"

 	"github.com/tinygo-org/tinygo/compileopts"
 	"github.com/tinygo-org/tinygo/goenv"
@@ -201,6 +202,22 @@ var avrBuiltins = []string{
 	"avr/udivmodqi4.S",
 }

+// Builtins needed specifically for windows/386.
+var windowsI386Builtins = []string{
+	"i386/chkstk.S",  // __chkstk_ms
+	"i386/chkstk2.S", // _alloca (__alloca)
+}
+
+// Builtins needed specifically for windows/amd64.
+var windowsAMD64Builtins = []string{
+	"x86_64/chkstk.S",
+}
+
+// Builtins needed specifically for windows/arm64.
+var windowsARM64Builtins = []string{
+	"aarch64/chkstk.S",
+}
+
 // libCompilerRT is a library with symbols required by programs compiled with
 // LLVM. These symbols are for operations that cannot be emitted with a single
 // instruction or a short sequence of instructions for that target.
@@ -220,16 +237,35 @@ var libCompilerRT = Library{
 		// Development build.
 		return filepath.Join(goenv.Get("TINYGOROOT"), "lib/compiler-rt-builtins")
 	},
-	librarySources: func(target string) ([]string, error) {
+	librarySources: func(target string, _ bool) ([]string, error) {
 		builtins := append([]string{}, genericBuiltins...) // copy genericBuiltins
 		switch compileopts.CanonicalArchName(target) {
 		case "arm":
 			builtins = append(builtins, aeabiBuiltins...)
 		case "avr":
 			builtins = append(builtins, avrBuiltins...)
-		case "x86_64", "aarch64", "riscv64": // any 64-bit arch
+		case "x86_64":
 			builtins = append(builtins, genericBuiltins128...)
+			if isWindowsTriple(target) {
+				builtins = append(builtins, windowsAMD64Builtins...)
+			}
+		case "aarch64":
+			builtins = append(builtins, genericBuiltins128...)
+			if isWindowsTriple(target) {
+				builtins = append(builtins, windowsARM64Builtins...)
+			}
+		case "riscv64":
+			builtins = append(builtins, genericBuiltins128...)
+		case "i386":
+			if isWindowsTriple(target) {
+				builtins = append(builtins, windowsI386Builtins...)
+			}
 		}
 		return builtins, nil
 	},
 }
+
+func isWindowsTriple(target string) bool {
+	parts := strings.Split(target, "-")
+	return len(parts) > 2 && parts[2] == "windows"
+}
@@ -281,7 +281,7 @@ func parseDepFile(s string) ([]string, error) {
 	s = strings.ReplaceAll(s, "\\\n", " ")

 	// Only use the first line, which is expected to begin with "deps:".
-	line := strings.SplitN(s, "\n", 2)[0]
+	line, _, _ := strings.Cut(s, "\n")
 	if !strings.HasPrefix(line, "deps:") {
 		return nil, errors.New("readDepFile: expected 'deps:' prefix")
 	}
@@ -23,7 +23,7 @@
 #include "clang/Basic/Diagnostic.h"
 #include "clang/Basic/DiagnosticOptions.h"
 #include "clang/Driver/DriverDiagnostic.h"
-#include "clang/Driver/Options.h"
+#include "clang/Options/Options.h"
 #include "clang/Frontend/FrontendDiagnostic.h"
 #include "clang/Frontend/TextDiagnosticPrinter.h"
 #include "clang/Frontend/Utils.h"
@@ -35,6 +35,7 @@
 #include "llvm/MC/MCAsmInfo.h"
 #include "llvm/MC/MCCodeEmitter.h"
 #include "llvm/MC/MCContext.h"
+#include "llvm/MC/MCInstPrinter.h"
 #include "llvm/MC/MCInstrInfo.h"
 #include "llvm/MC/MCObjectFileInfo.h"
 #include "llvm/MC/MCObjectWriter.h"
@@ -67,8 +68,7 @@
 #include <optional>
 #include <system_error>
 using namespace clang;
-using namespace clang::driver;
-using namespace clang::driver::options;
+using namespace clang::options;
 using namespace llvm;
 using namespace llvm::opt;

@@ -109,7 +109,7 @@ bool AssemblerInvocation::CreateFromArgs(AssemblerInvocation &Opts,
  // Construct the invocation.

  // Target Options
-  Opts.Triple = llvm::Triple::normalize(Args.getLastArgValue(OPT_triple));
+  Opts.Triple = llvm::Triple(llvm::Triple::normalize(Args.getLastArgValue(OPT_triple)));
  if (Arg *A = Args.getLastArg(options::OPT_darwin_target_variant_triple))
    Opts.DarwinTargetVariantTriple = llvm::Triple(A->getValue());
  if (Arg *A = Args.getLastArg(OPT_darwin_target_variant_sdk_version_EQ)) {
@@ -125,8 +125,8 @@ bool AssemblerInvocation::CreateFromArgs(AssemblerInvocation &Opts,
  Opts.Features = Args.getAllArgValues(OPT_target_feature);

  // Use the default target triple if unspecified.
-  if (Opts.Triple.empty())
-    Opts.Triple = llvm::sys::getDefaultTargetTriple();
+  if (Opts.Triple.getTriple().empty())
+    Opts.Triple = llvm::Triple(llvm::sys::getDefaultTargetTriple());

  // Language Options
  Opts.IncludePaths = Args.getAllArgValues(OPT_I);
@@ -144,8 +144,6 @@ bool AssemblerInvocation::CreateFromArgs(AssemblerInvocation &Opts,
            .Default(llvm::DebugCompressionType::None);
  }

-  Opts.RelaxELFRelocations = !Args.hasArg(OPT_mrelax_relocations_no);
-  Opts.SSE2AVX = Args.hasArg(OPT_msse2avx);
  if (auto *DwarfFormatArg = Args.getLastArg(OPT_gdwarf64, OPT_gdwarf32))
    Opts.Dwarf64 = DwarfFormatArg->getOption().matches(OPT_gdwarf64);
  Opts.DwarfVersion = getLastArgIntValue(Args, OPT_dwarf_version_EQ, 2, Diags);
@@ -236,6 +234,9 @@ bool AssemblerInvocation::CreateFromArgs(AssemblerInvocation &Opts,
  Opts.EmitCompactUnwindNonCanonical =
      Args.hasArg(OPT_femit_compact_unwind_non_canonical);
  Opts.Crel = Args.hasArg(OPT_crel);
+  Opts.ImplicitMapsyms = Args.hasArg(OPT_mmapsyms_implicit);
+  Opts.X86RelaxRelocations = !Args.hasArg(OPT_mrelax_relocations_no);
+  Opts.X86Sse2Avx = Args.hasArg(OPT_msse2avx);

  Opts.AsSecureLogFile = Args.getLastArgValue(OPT_as_secure_log_file);

@@ -266,7 +267,7 @@ static bool ExecuteAssemblerImpl(AssemblerInvocation &Opts,
  std::string Error;
  const Target *TheTarget = TargetRegistry::lookupTarget(Opts.Triple, Error);
  if (!TheTarget)
-    return Diags.Report(diag::err_target_unknown_triple) << Opts.Triple;
+    return Diags.Report(diag::err_target_unknown_triple) << Opts.Triple.str();

  ErrorOr<std::unique_ptr<MemoryBuffer>> Buffer =
      MemoryBuffer::getFileOrSTDIN(Opts.InputFile, /*IsText=*/true);
@@ -294,8 +295,9 @@ static bool ExecuteAssemblerImpl(AssemblerInvocation &Opts,
  MCOptions.EmitCompactUnwindNonCanonical = Opts.EmitCompactUnwindNonCanonical;
  MCOptions.MCSaveTempLabels = Opts.SaveTemporaryLabels;
  MCOptions.Crel = Opts.Crel;
-  MCOptions.X86RelaxRelocations = Opts.RelaxELFRelocations;
-  MCOptions.X86Sse2Avx = Opts.SSE2AVX;
+  MCOptions.ImplicitMapSyms = Opts.ImplicitMapsyms;
+  MCOptions.X86RelaxRelocations = Opts.X86RelaxRelocations;
+  MCOptions.X86Sse2Avx = Opts.X86Sse2Avx;
  MCOptions.CompressDebugSections = Opts.CompressDebugSections;
  MCOptions.AsSecureLogFile = Opts.AsSecureLogFile;

@@ -325,7 +327,7 @@ static bool ExecuteAssemblerImpl(AssemblerInvocation &Opts,
      TheTarget->createMCSubtargetInfo(Opts.Triple, Opts.CPU, FS));
  assert(STI && "Unable to create subtarget info!");

-  MCContext Ctx(Triple(Opts.Triple), MAI.get(), MRI.get(), STI.get(), &SrcMgr,
+  MCContext Ctx(Opts.Triple, MAI.get(), MRI.get(), STI.get(), &SrcMgr,
                &MCOptions);

  bool PIC = false;
@@ -343,10 +345,6 @@ static bool ExecuteAssemblerImpl(AssemblerInvocation &Opts,
  // MCObjectFileInfo needs a MCContext reference in order to initialize itself.
  std::unique_ptr<MCObjectFileInfo> MOFI(
      TheTarget->createMCObjectFileInfo(Ctx, PIC));
-  if (Opts.DarwinTargetVariantTriple)
-    MOFI->setDarwinTargetVariantTriple(*Opts.DarwinTargetVariantTriple);
-  if (!Opts.DarwinTargetVariantSDKVersion.empty())
-    MOFI->setDarwinTargetVariantSDKVersion(Opts.DarwinTargetVariantSDKVersion);
  Ctx.setObjectFileInfo(MOFI.get());

  if (Opts.GenDwarfForAssembly)
@@ -392,8 +390,8 @@ static bool ExecuteAssemblerImpl(AssemblerInvocation &Opts,

  // FIXME: There is a bit of code duplication with addPassesToEmitFile.
  if (Opts.OutputType == AssemblerInvocation::FT_Asm) {
-    MCInstPrinter *IP = TheTarget->createMCInstPrinter(
-        llvm::Triple(Opts.Triple), Opts.OutputAsmVariant, *MAI, *MCII, *MRI);
+    std::unique_ptr<MCInstPrinter> IP(TheTarget->createMCInstPrinter(
+        Opts.Triple, Opts.OutputAsmVariant, *MAI, *MCII, *MRI));

    std::unique_ptr<MCCodeEmitter> CE;
    if (Opts.ShowEncoding)
@@ -402,7 +400,7 @@ static bool ExecuteAssemblerImpl(AssemblerInvocation &Opts,
        TheTarget->createMCAsmBackend(*STI, *MRI, MCOptions));

    auto FOut = std::make_unique<formatted_raw_ostream>(*Out);
-    Str.reset(TheTarget->createAsmStreamer(Ctx, std::move(FOut), IP,
+    Str.reset(TheTarget->createAsmStreamer(Ctx, std::move(FOut), std::move(IP),
                                           std::move(CE), std::move(MAB)));
  } else if (Opts.OutputType == AssemblerInvocation::FT_Null) {
    Str.reset(createNullStreamer(Ctx));
@@ -424,10 +422,17 @@ static bool ExecuteAssemblerImpl(AssemblerInvocation &Opts,
        DwoOS ? MAB->createDwoObjectWriter(*Out, *DwoOS)
              : MAB->createObjectWriter(*Out);

-    Triple T(Opts.Triple);
+    Triple T = Opts.Triple;
    Str.reset(TheTarget->createMCObjectStreamer(
        T, Ctx, std::move(MAB), std::move(OW), std::move(CE), *STI));
    Str.get()->initSections(Opts.NoExecStack, *STI);
+    if (T.isOSBinFormatMachO() && T.isOSDarwin()) {
+      Triple *TVT = Opts.DarwinTargetVariantTriple
+                        ? &*Opts.DarwinTargetVariantTriple
+                        : nullptr;
+      Str->emitVersionForTarget(T, VersionTuple(), TVT,
+                                Opts.DarwinTargetVariantSDKVersion);
+    }
  }

  // When -fembed-bitcode is passed to clang_as, a 1-byte marker
@@ -448,7 +453,7 @@ static bool ExecuteAssemblerImpl(AssemblerInvocation &Opts,
  std::unique_ptr<MCTargetAsmParser> TAP(
      TheTarget->createMCAsmParser(*STI, *Parser, *MCII, MCOptions));
  if (!TAP)
-    Failed = Diags.Report(diag::err_target_unknown_triple) << Opts.Triple;
+    Failed = Diags.Report(diag::err_target_unknown_triple) << Opts.Triple.str();

  // Set values for symbols, if any.
  for (auto &S : Opts.SymbolDefs) {
@@ -501,12 +506,12 @@ int cc1as_main(ArrayRef<const char *> Argv, const char *Argv0, void *MainAddr) {
  InitializeAllAsmParsers();

  // Construct our diagnostic client.
-  IntrusiveRefCntPtr<DiagnosticOptions> DiagOpts = new DiagnosticOptions();
+  DiagnosticOptions DiagOpts;
  TextDiagnosticPrinter *DiagClient
-    = new TextDiagnosticPrinter(errs(), &*DiagOpts);
+    = new TextDiagnosticPrinter(errs(), DiagOpts);
  DiagClient->setPrefix("clang -cc1as");
  IntrusiveRefCntPtr<DiagnosticIDs> DiagID(new DiagnosticIDs());
-  DiagnosticsEngine Diags(DiagID, &*DiagOpts, DiagClient);
+  DiagnosticsEngine Diags(DiagID, DiagOpts, DiagClient);

  // Set an error handler, so that any LLVM backend diagnostics go through our
  // error handler.
@@ -523,7 +528,7 @@ int cc1as_main(ArrayRef<const char *> Argv, const char *Argv0, void *MainAddr) {
        llvm::outs(), "clang -cc1as [options] file...",
        "Clang Integrated Assembler", /*ShowHidden=*/false,
        /*ShowAllAliases=*/false,
-        llvm::opt::Visibility(driver::options::CC1AsOption));
+        llvm::opt::Visibility(clang::options::CC1AsOption));

    return 0;
  }
@@ -20,7 +20,7 @@ struct AssemblerInvocation {
  /// @{

  /// The name of the target triple to assemble for.
-  std::string Triple;
+  llvm::Triple Triple;

  /// If given, the name of the target CPU to determine which instructions
  /// are legal.
@@ -45,10 +45,6 @@ struct AssemblerInvocation {
  LLVM_PREFERRED_TYPE(bool)
  unsigned GenDwarfForAssembly : 1;
  LLVM_PREFERRED_TYPE(bool)
-  unsigned RelaxELFRelocations : 1;
-  LLVM_PREFERRED_TYPE(bool)
-  unsigned SSE2AVX : 1;
-  LLVM_PREFERRED_TYPE(bool)
  unsigned Dwarf64 : 1;
  unsigned DwarfVersion;
  std::string DwarfDebugFlags;
@@ -111,12 +107,19 @@ struct AssemblerInvocation {
  EmitDwarfUnwindType EmitDwarfUnwind;

  // Whether to emit compact-unwind for non-canonical entries.
-  // Note: maybe overriden by other constraints.
+  // Note: maybe overridden by other constraints.
  LLVM_PREFERRED_TYPE(bool)
  unsigned EmitCompactUnwindNonCanonical : 1;

  LLVM_PREFERRED_TYPE(bool)
  unsigned Crel : 1;
+  LLVM_PREFERRED_TYPE(bool)
+  unsigned ImplicitMapsyms : 1;
+
+  LLVM_PREFERRED_TYPE(bool)
+  unsigned X86RelaxRelocations : 1;
+  LLVM_PREFERRED_TYPE(bool)
+  unsigned X86Sse2Avx : 1;

  /// The name of the relocation model to use.
  std::string RelocationModel;
@@ -139,7 +142,7 @@ struct AssemblerInvocation {

 public:
  AssemblerInvocation() {
-    Triple = "";
+    Triple = llvm::Triple();
    NoInitialTextSection = 0;
    InputFile = "-";
    OutputPath = "-";
@@ -148,7 +151,6 @@ public:
    ShowInst = 0;
    ShowEncoding = 0;
    RelaxAll = 0;
-    SSE2AVX = 0;
    NoExecStack = 0;
    FatalWarnings = 0;
    NoWarn = 0;
@@ -160,6 +162,9 @@ public:
    EmitDwarfUnwind = EmitDwarfUnwindType::Default;
    EmitCompactUnwindNonCanonical = false;
    Crel = false;
+    ImplicitMapsyms = 0;
+    X86RelaxRelocations = 0;
+    X86Sse2Avx = 0;
  }

  static bool CreateFromArgs(AssemblerInvocation &Res,
@@ -27,9 +27,9 @@ bool tinygo_clang_driver(int argc, char **argv) {
 	std::vector<const char*> args(argv, argv + argc);

 	// The compiler invocation needs a DiagnosticsEngine so it can report problems
-	llvm::IntrusiveRefCntPtr<clang::DiagnosticOptions> DiagOpts = new clang::DiagnosticOptions();
-	clang::TextDiagnosticPrinter DiagnosticPrinter(llvm::errs(), &*DiagOpts);
-	clang::DiagnosticsEngine Diags(llvm::IntrusiveRefCntPtr<clang::DiagnosticIDs>(new clang::DiagnosticIDs()), &*DiagOpts, &DiagnosticPrinter, false);
+	clang::DiagnosticOptions DiagOpts;
+	clang::TextDiagnosticPrinter DiagnosticPrinter(llvm::errs(), DiagOpts);
+	clang::DiagnosticsEngine Diags(llvm::IntrusiveRefCntPtr<clang::DiagnosticIDs>(new clang::DiagnosticIDs()), DiagOpts, &DiagnosticPrinter, false);

 	// Create the clang driver
 	clang::driver::Driver TheDriver(args[0], llvm::sys::getDefaultTargetTriple(), Diags);
@@ -17,7 +17,7 @@ import (
 var commands = map[string][]string{}

 func init() {
-	llvmMajor := strings.Split(llvm.Version, ".")[0]
+	llvmMajor, _, _ := strings.Cut(llvm.Version, ".")
 	commands["clang"] = []string{"clang-" + llvmMajor}
 	commands["ld.lld"] = []string{"ld.lld-" + llvmMajor, "ld.lld"}
 	commands["wasm-ld"] = []string{"wasm-ld-" + llvmMajor, "wasm-ld"}
@@ -25,18 +25,21 @@ func NewConfig(options *compileopts.Options) (*compileopts.Config, error) {
 	}

 	// Version range supported by TinyGo.
-	const minorMin = 19
-	const minorMax = 23
+	const minorMin = 25 // when updating the min version, also update .github/workflows/compat.yml
+	const minorMax = 27

 	// Check that we support this Go toolchain version.
 	gorootMajor, gorootMinor, err := goenv.GetGorootVersion()
 	if err != nil {
 		return nil, err
 	}
-	if gorootMajor != 1 || gorootMinor < minorMin || gorootMinor > minorMax {
-		// Note: when this gets updated, also update the Go compatibility matrix:
-		// https://github.com/tinygo-org/tinygo-site/blob/dev/content/docs/reference/go-compat-matrix.md
-		return nil, fmt.Errorf("requires go version 1.19 through 1.23, got go%d.%d", gorootMajor, gorootMinor)
+
+	if options.GoCompatibility {
+		if gorootMajor != 1 || gorootMinor < minorMin || gorootMinor > minorMax {
+			// Note: when this gets updated, also update the Go compatibility matrix:
+			// https://github.com/tinygo-org/tinygo-site/blob/dev/content/docs/reference/go-compat-matrix.md
+			return nil, fmt.Errorf("requires go version 1.%d through 1.%d, got go%d.%d", minorMin, minorMax, gorootMajor, gorootMinor)
+		}
 	}

 	// Check that the Go toolchain version isn't too new, if we haven't been
@@ -15,7 +15,7 @@ func makeDarwinLibSystemJob(config *compileopts.Config, tmpdir string) *compileJ
 	return &compileJob{
 		description: "compile Darwin libSystem.dylib",
 		run: func(job *compileJob) (err error) {
-			arch := strings.Split(config.Triple(), "-")[0]
+			arch, _, _ := strings.Cut(config.Triple(), "-")
 			job.result = filepath.Join(tmpdir, "libSystem.dylib")
 			objpath := filepath.Join(tmpdir, "libSystem.o")
 			inpath := filepath.Join(goenv.Get("TINYGOROOT"), "lib/macos-minimal-sdk/src", arch, "libSystem.s")
@@ -23,7 +23,7 @@ type espImageSegment struct {
 	data []byte
 }

-// makeESPFirmareImage converts an input ELF file to an image file for an ESP32 or
+// makeESPFirmwareImage converts an input ELF file to an image file for an ESP32 or
 // ESP8266 chip. This is a special purpose image format just for the ESP chip
 // family, and is parsed by the on-chip mask ROM bootloader.
 //
@@ -31,7 +31,7 @@ type espImageSegment struct {
 // https://github.com/espressif/esptool/wiki/Firmware-Image-Format
 // https://github.com/espressif/esp-idf/blob/8fbb63c2a701c22ccf4ce249f43aded73e134a34/components/bootloader_support/include/esp_image_format.h#L58
 // https://github.com/espressif/esptool/blob/master/esptool.py
-func makeESPFirmareImage(infile, outfile, format string) error {
+func makeESPFirmwareImage(infile, outfile, format string) error {
 	inf, err := elf.Open(infile)
 	if err != nil {
 		return err
@@ -65,15 +65,6 @@ func makeESPFirmareImage(infile, outfile, format string) error {
 	// Sort the segments by address. This is what esptool does too.
 	sort.SliceStable(segments, func(i, j int) bool { return segments[i].addr < segments[j].addr })

-	// Calculate checksum over the segment data. This is used in the image
-	// footer.
-	checksum := uint8(0xef)
-	for _, segment := range segments {
-		for _, b := range segment.data {
-			checksum ^= b
-		}
-	}
-
 	// Write first to an in-memory buffer, primarily so that we can easily
 	// calculate a hash over the entire image.
 	// An added benefit is that we don't need to check for errors all the time.
@@ -88,6 +79,86 @@ func makeESPFirmareImage(infile, outfile, format string) error {
 		chip = format[:len(format)-len("-img")]
 	}

+	// For ESP32 (original): separate RAM segments (loadable by ROM bootloader)
+	// from flash-mapped segments (DROM/IROM, require MMU setup by startup code).
+	// The ROM bootloader on ESP32 does NOT handle flash-mapped segments —
+	// it tries to memcpy to the virtual address, which crashes.
+	var flashSegments []*espImageSegment
+	if chip == "esp32" {
+		var ramSegments []*espImageSegment
+		for _, seg := range segments {
+			if (seg.addr >= 0x3F400000 && seg.addr < 0x3F800000) || // DROM
+				(seg.addr >= 0x400D0000 && seg.addr < 0x40400000) { // IROM
+				flashSegments = append(flashSegments, seg)
+			} else {
+				ramSegments = append(ramSegments, seg)
+			}
+		}
+		segments = ramSegments
+	}
+
+	// ESP32 flash XIP: compute where the DROM segment will be placed in flash
+	// (page-aligned, right after the RAM segments) and patch the
+	// _drom_flash_addr variable so the startup code can program the cache MMU.
+	// This must happen before the checksum/hash are computed so the patched
+	// value is covered by both.
+	const esp32FlashBase = 0x1000 // esptool flashes the image at 0x1000
+	// The ESP32 flash cache MMU supports configurable page sizes down to 256 B. 64 KiB is the reset/default size.
+	// If the startup code ever changes the MMU page size, this constant must change too.
+	const esp32PageSize = 0x10000 // 64KB MMU pages
+	var esp32DromFlashAddr uint32
+	if chip == "esp32" && len(flashSegments) > 0 {
+		// Compute the size of the RAM portion of the image (everything the ROM
+		// bootloader loads, up to and including the appended SHA256 hash).
+		ramImageSize := 0
+		if makeImage {
+			ramImageSize += 4096
+		}
+		ramImageSize += 24 // image header (8) + trailer fields (16)
+		for _, seg := range segments {
+			ramImageSize += 8 + len(seg.data) // segment header + data (4-aligned)
+		}
+		ramImageSize += 16 - ramImageSize%16 // footer padding + checksum byte
+		ramImageSize += 32                   // appended SHA256 hash
+
+		// DROM flash address must be 64KB page-aligned.
+		esp32DromFlashAddr = uint32(esp32FlashBase+ramImageSize+esp32PageSize-1) &^ (esp32PageSize - 1)
+
+		// Patch _drom_flash_addr in whichever RAM segment contains it.
+		syms, _ := inf.Symbols()
+		var dromSymAddr uint64
+		for _, s := range syms {
+			if s.Name == "_drom_flash_addr" {
+				dromSymAddr = s.Value
+				break
+			}
+		}
+		if dromSymAddr == 0 {
+			return fmt.Errorf("ESP32: _drom_flash_addr symbol not found")
+		}
+		patched := false
+		for _, seg := range segments {
+			if dromSymAddr >= uint64(seg.addr) && dromSymAddr+4 <= uint64(seg.addr)+uint64(len(seg.data)) {
+				off := int(dromSymAddr - uint64(seg.addr))
+				binary.LittleEndian.PutUint32(seg.data[off:], esp32DromFlashAddr)
+				patched = true
+				break
+			}
+		}
+		if !patched {
+			return fmt.Errorf("ESP32: _drom_flash_addr (0x%x) not in any RAM segment", dromSymAddr)
+		}
+	}
+
+	// Calculate checksum over the segment data. This is used in the image
+	// footer.
+	checksum := uint8(0xef)
+	for _, segment := range segments {
+		for _, b := range segment.data {
+			checksum ^= b
+		}
+	}
+
 	if makeImage {
 		// The bootloader starts at 0x1000, or 4096.
 		// TinyGo doesn't use a separate bootloader and runs the entire
@@ -100,11 +171,24 @@ func makeESPFirmareImage(infile, outfile, format string) error {
 	chip_id := map[string]uint16{
 		"esp32":   0x0000,
 		"esp32c3": 0x0005,
+		"esp32c6": 0x000d,
+		"esp32s3": 0x0009,
+	}[chip]
+
+	// SPI flash speed/size byte (byte 3 of header):
+	//   Upper nibble = flash size, lower nibble = flash frequency.
+	//   The espflasher auto-detects and patches the flash size (upper nibble),
+	//   but the frequency (lower nibble) must be correct per chip.
+	spiSpeedSize := map[string]uint8{
+		"esp32":   0x1f, // 80MHz=0x0F, 2MB=0x10
+		"esp32c3": 0x1f, // 80MHz=0x0F, 2MB=0x10
+		"esp32c6": 0x10, // 80MHz=0x00, 2MB=0x10 (C6 uses different freq encoding)
+		"esp32s3": 0x1f, // 80MHz=0x0F, 2MB=0x10
 	}[chip]

 	// Image header.
 	switch chip {
-	case "esp32", "esp32c3":
+	case "esp32", "esp32c3", "esp32s3", "esp32c6":
 		// Header format:
 		// https://github.com/espressif/esp-idf/blob/v4.3/components/bootloader_support/include/esp_app_format.h#L71
 		// Note: not adding a SHA256 hash as the binary is modified by
@@ -125,8 +209,8 @@ func makeESPFirmareImage(infile, outfile, format string) error {
 		}{
 			magic:          0xE9,
 			segment_count:  byte(len(segments)),
-			spi_mode:       2,    // ESP_IMAGE_SPI_MODE_DIO
-			spi_speed_size: 0x1f, // ESP_IMAGE_SPI_SPEED_80M, ESP_IMAGE_FLASH_SIZE_2MB
+			spi_mode:       2, // ESP_IMAGE_SPI_MODE_DIO
+			spi_speed_size: spiSpeedSize,
 			entry_addr:     uint32(inf.Entry),
 			wp_pin:         0xEE, // disable WP pin
 			chip_id:        chip_id,
@@ -178,6 +262,58 @@ func makeESPFirmareImage(infile, outfile, format string) error {
 		outf.Write(hash[:])
 	}

+	// For ESP32: append flash-mapped segments (DROM/IROM) at page-aligned flash
+	// offsets after the RAM portion. The startup code maps them via the flash
+	// cache MMU (DROM at esp32DromFlashAddr, patched into _drom_flash_addr).
+	if len(flashSegments) > 0 {
+		const flashBase = esp32FlashBase
+		const pageSize = esp32PageSize
+		dromFlashAddr := esp32DromFlashAddr
+
+		// Separate DROM and IROM segments.
+		var dromSegs, iromSegs []*espImageSegment
+		for _, seg := range flashSegments {
+			if seg.addr >= 0x3F400000 && seg.addr < 0x3F800000 {
+				dromSegs = append(dromSegs, seg)
+			} else {
+				iromSegs = append(iromSegs, seg)
+			}
+		}
+
+		// Write DROM segments at the computed page-aligned flash offset.
+		dromSize := 0
+		if len(dromSegs) > 0 {
+			targetImageOffset := int(dromFlashAddr - flashBase)
+			if outf.Len() > targetImageOffset {
+				return fmt.Errorf("ESP32: RAM segments too large (%d bytes), overlap DROM at flash 0x%x", outf.Len(), dromFlashAddr)
+			}
+			outf.Write(make([]byte, targetImageOffset-outf.Len()))
+			for _, seg := range dromSegs {
+				outf.Write(seg.data)
+				dromSize += len(seg.data)
+			}
+		}
+
+		// Write IROM segments immediately after DROM, at the next page boundary.
+		// IROM flash addr = dromFlashAddr + ceil(dromSize/pageSize)*pageSize
+		// (must match the computation in the startup assembly).
+		if len(iromSegs) > 0 {
+			dromPages := (dromSize + pageSize - 1) / pageSize
+			if dromPages == 0 {
+				dromPages = 1
+			}
+			iromFlashAddr := dromFlashAddr + uint32(dromPages)*pageSize
+			targetImageOffset := int(iromFlashAddr - flashBase)
+			if outf.Len() > targetImageOffset {
+				return fmt.Errorf("ESP32: DROM too large, overlaps IROM at flash 0x%x", iromFlashAddr)
+			}
+			outf.Write(make([]byte, targetImageOffset-outf.Len()))
+			for _, seg := range iromSegs {
+				outf.Write(seg.data)
+			}
+		}
+	}
+
 	// QEMU (or more precisely, qemu-system-xtensa from Espressif) expects the
 	// image to be a certain size.
 	if makeImage {
@@ -195,11 +195,11 @@ type intHeap struct {
 	sort.IntSlice
 }

-func (h *intHeap) Push(x interface{}) {
+func (h *intHeap) Push(x any) {
 	h.IntSlice = append(h.IntSlice, x.(int))
 }

-func (h *intHeap) Pop() interface{} {
+func (h *intHeap) Pop() any {
 	x := h.IntSlice[len(h.IntSlice)-1]
 	h.IntSlice = h.IntSlice[:len(h.IntSlice)-1]
 	return x
@@ -15,6 +15,9 @@ import (

 // Library is a container for information about a single C library, such as a
 // compiler runtime or libc.
+//
+// Note: whenever a library gets changed, the version in compileopts/config.go
+// probably also needs to be incremented.
 type Library struct {
 	// The library name, such as compiler-rt or picolibc.
 	name string
@@ -25,11 +28,17 @@ type Library struct {
 	// cflags returns the C flags specific to this library
 	cflags func(target, headerPath string) []string

+	// cflagsForFile returns additional C flags for a particular source file.
+	cflagsForFile func(path string) []string
+
+	// needsLibc is set to true if this library needs libc headers.
+	needsLibc bool
+
 	// The source directory.
 	sourceDir func() string

 	// The source files, relative to sourceDir.
-	librarySources func(target string) ([]string, error)
+	librarySources func(target string, libcNeedsMalloc bool) ([]string, error)

 	// The source code for the crt1.o file, relative to sourceDir.
 	crt1Source string
@@ -44,13 +53,8 @@ type Library struct {
 // As a side effect, this call creates the library header files if they didn't
 // exist yet.
 func (l *Library) load(config *compileopts.Config, tmpdir string) (job *compileJob, abortLock func(), err error) {
-	outdir, precompiled := config.LibcPath(l.name)
+	outdir := config.LibraryPath(l.name)
 	archiveFilePath := filepath.Join(outdir, "lib.a")
-	if precompiled {
-		// Found a precompiled library for this OS/architecture. Return the path
-		// directly.
-		return dummyCompileJob(archiveFilePath), func() {}, nil
-	}

 	// Create a lock on the output (if supported).
 	// This is a bit messy, but avoids a deadlock because it is ordered consistently with other library loads within a build.
@@ -129,7 +133,7 @@ func (l *Library) load(config *compileopts.Config, tmpdir string) (job *compileJ
 	// Note: -fdebug-prefix-map is necessary to make the output archive
 	// reproducible. Otherwise the temporary directory is stored in the archive
 	// itself, which varies each run.
-	args := append(l.cflags(target, headerPath), "-c", "-Oz", "-gdwarf-4", "-ffunction-sections", "-fdata-sections", "-Wno-macro-redefined", "--target="+target, "-fdebug-prefix-map="+dir+"="+remapDir)
+	args := append(l.cflags(target, headerPath), "-c", "-Oz", "-gdwarf-4", "-ffunction-sections", "-fdata-sections", "-Wno-macro-redefined", "--target="+compileopts.ClangTriple(target), "-fdebug-prefix-map="+dir+"="+remapDir)
 	resourceDir := goenv.ClangResourceDir(false)
 	if resourceDir != "" {
 		args = append(args, "-resource-dir="+resourceDir)
@@ -163,9 +167,9 @@ func (l *Library) load(config *compileopts.Config, tmpdir string) (job *compileJ
 		// double.
 		args = append(args, "-mdouble=64")
 	case "riscv32":
-		args = append(args, "-march=rv32imac", "-fforce-enable-int128")
+		args = append(args, "-march="+riscvMarch(config, "rv32imac"), "-fforce-enable-int128")
 	case "riscv64":
-		args = append(args, "-march=rv64gc")
+		args = append(args, "-march="+riscvMarch(config, "rv64gc"))
 	case "mips":
 		args = append(args, "-fno-pic")
 	}
@@ -181,6 +185,9 @@ func (l *Library) load(config *compileopts.Config, tmpdir string) (job *compileJ
 			args = append(args, "-mfpu=vfpv2")
 		}
 	}
+	if l.needsLibc {
+		args = append(args, config.LibcCFlags()...)
+	}

 	var once sync.Once

@@ -211,7 +218,7 @@ func (l *Library) load(config *compileopts.Config, tmpdir string) (job *compileJ
 				return err
 			}
 			// Store this archive in the cache.
-			return os.Rename(f.Name(), archiveFilePath)
+			return robustRename(f.Name(), archiveFilePath)
 		},
 	}

@@ -219,7 +226,7 @@ func (l *Library) load(config *compileopts.Config, tmpdir string) (job *compileJ

 	// Create jobs to compile all sources. These jobs are depended upon by the
 	// archive job above, so must be run first.
-	paths, err := l.librarySources(target)
+	paths, err := l.librarySources(target, config.LibcNeedsMalloc())
 	if err != nil {
 		return nil, nil, err
 	}
@@ -233,11 +240,14 @@ func (l *Library) load(config *compileopts.Config, tmpdir string) (job *compileJ
 		objpath := filepath.Join(dir, cleanpath+".o")
 		os.MkdirAll(filepath.Dir(objpath), 0o777)
 		objs = append(objs, objpath)
-		job.dependencies = append(job.dependencies, &compileJob{
+		objfile := &compileJob{
 			description: "compile " + srcpath,
 			run: func(*compileJob) error {
 				var compileArgs []string
 				compileArgs = append(compileArgs, args...)
+				if l.cflagsForFile != nil {
+					compileArgs = append(compileArgs, l.cflagsForFile(path)...)
+				}
 				compileArgs = append(compileArgs, "-o", objpath, srcpath)
 				if config.Options.PrintCommands != nil {
 					config.Options.PrintCommands("clang", compileArgs...)
@@ -248,7 +258,8 @@ func (l *Library) load(config *compileopts.Config, tmpdir string) (job *compileJ
 				}
 				return nil
 			},
-		})
+		}
+		job.dependencies = append(job.dependencies, objfile)
 	}

 	// Create crt1.o job, if needed.
@@ -257,7 +268,7 @@ func (l *Library) load(config *compileopts.Config, tmpdir string) (job *compileJ
 	// won't make much of a difference in speed).
 	if l.crt1Source != "" {
 		srcpath := filepath.Join(sourceDir, l.crt1Source)
-		job.dependencies = append(job.dependencies, &compileJob{
+		crt1Job := &compileJob{
 			description: "compile " + srcpath,
 			run: func(*compileJob) error {
 				var compileArgs []string
@@ -277,7 +288,8 @@ func (l *Library) load(config *compileopts.Config, tmpdir string) (job *compileJ
 				}
 				return os.Rename(tmpfile.Name(), filepath.Join(outdir, "crt1.o"))
 			},
-		})
+		}
+		job.dependencies = append(job.dependencies, crt1Job)
 	}

 	ok = true
@@ -285,3 +297,17 @@ func (l *Library) load(config *compileopts.Config, tmpdir string) (job *compileJ
 		once.Do(unlock)
 	}, nil
 }
+
+// riscvMarch returns the -march value for RISC-V library compilation.
+// It extracts the value from the target's cflags if present, otherwise
+// falls back to the provided default. This ensures libraries are compiled
+// with the correct ISA extensions for each target (e.g. rv32imc for
+// ESP32-C3 which lacks the atomic extension).
+func riscvMarch(config *compileopts.Config, defaultMarch string) string {
+	for _, flag := range config.Target.CFlags {
+		if strings.HasPrefix(flag, "-march=") {
+			return flag[len("-march="):]
+		}
+	}
+	return defaultMarch
+}
@@ -30,25 +30,62 @@ var libMinGW = Library{
 	sourceDir: func() string { return filepath.Join(goenv.Get("TINYGOROOT"), "lib/mingw-w64") },
 	cflags: func(target, headerPath string) []string {
 		mingwDir := filepath.Join(goenv.Get("TINYGOROOT"), "lib/mingw-w64")
-		return []string{
+		flags := []string{
 			"-nostdlibinc",
+			"-isystem", mingwDir + "/mingw-w64-crt/include",
 			"-isystem", mingwDir + "/mingw-w64-headers/crt",
+			"-isystem", mingwDir + "/mingw-w64-headers/include",
 			"-I", mingwDir + "/mingw-w64-headers/defaults/include",
 			"-I" + headerPath,
 		}
+		if strings.Split(target, "-")[0] == "i386" {
+			flags = append(flags,
+				"-D__MSVCRT_VERSION__=0x700", // Microsoft Visual C++ .NET 2002
+				"-D_WIN32_WINNT=0x0501",      // target Windows XP
+				"-D_CRTBLD",
+				"-Wno-pragma-pack",
+			)
+		}
+		return flags
 	},
-	librarySources: func(target string) ([]string, error) {
+	librarySources: func(target string, _ bool) ([]string, error) {
 		// These files are needed so that printf and the like are supported.
-		sources := []string{
-			"mingw-w64-crt/stdio/ucrt_fprintf.c",
-			"mingw-w64-crt/stdio/ucrt_fwprintf.c",
-			"mingw-w64-crt/stdio/ucrt_printf.c",
-			"mingw-w64-crt/stdio/ucrt_snprintf.c",
-			"mingw-w64-crt/stdio/ucrt_sprintf.c",
-			"mingw-w64-crt/stdio/ucrt_vfprintf.c",
-			"mingw-w64-crt/stdio/ucrt_vprintf.c",
-			"mingw-w64-crt/stdio/ucrt_vsnprintf.c",
-			"mingw-w64-crt/stdio/ucrt_vsprintf.c",
+		var sources []string
+		if strings.Split(target, "-")[0] == "i386" {
+			// Old 32-bit x86 systems use msvcrt.dll.
+			sources = []string{
+				"mingw-w64-crt/crt/pseudo-reloc.c",
+				"mingw-w64-crt/gdtoa/dmisc.c",
+				"mingw-w64-crt/gdtoa/gdtoa.c",
+				"mingw-w64-crt/gdtoa/gmisc.c",
+				"mingw-w64-crt/gdtoa/misc.c",
+				"mingw-w64-crt/math/x86/exp2.S",
+				"mingw-w64-crt/math/x86/trunc.S",
+				"mingw-w64-crt/misc/___mb_cur_max_func.c",
+				"mingw-w64-crt/misc/lc_locale_func.c",
+				"mingw-w64-crt/misc/mbrtowc.c",
+				"mingw-w64-crt/misc/strnlen.c",
+				"mingw-w64-crt/misc/wcrtomb.c",
+				"mingw-w64-crt/misc/wcsnlen.c",
+				"mingw-w64-crt/stdio/acrt_iob_func.c",
+				"mingw-w64-crt/stdio/mingw_lock.c",
+				"mingw-w64-crt/stdio/mingw_pformat.c",
+				"mingw-w64-crt/stdio/mingw_vfprintf.c",
+				"mingw-w64-crt/stdio/mingw_vsnprintf.c",
+			}
+		} else {
+			// Anything somewhat modern (amd64, arm64) uses UCRT.
+			sources = []string{
+				"mingw-w64-crt/stdio/ucrt_fprintf.c",
+				"mingw-w64-crt/stdio/ucrt_fwprintf.c",
+				"mingw-w64-crt/stdio/ucrt_printf.c",
+				"mingw-w64-crt/stdio/ucrt_snprintf.c",
+				"mingw-w64-crt/stdio/ucrt_sprintf.c",
+				"mingw-w64-crt/stdio/ucrt_vfprintf.c",
+				"mingw-w64-crt/stdio/ucrt_vprintf.c",
+				"mingw-w64-crt/stdio/ucrt_vsnprintf.c",
+				"mingw-w64-crt/stdio/ucrt_vsprintf.c",
+			}
 		}
 		return sources, nil
 	},
@@ -63,27 +100,41 @@ var libMinGW = Library{
 func makeMinGWExtraLibs(tmpdir, goarch string) []*compileJob {
 	var jobs []*compileJob
 	root := goenv.Get("TINYGOROOT")
-	// Normally all the api-ms-win-crt-*.def files are all compiled to a single
-	// .lib file. But to simplify things, we're going to leave them as separate
-	// files.
-	for _, name := range []string{
-		"kernel32.def.in",
-		"api-ms-win-crt-conio-l1-1-0.def",
-		"api-ms-win-crt-convert-l1-1-0.def.in",
-		"api-ms-win-crt-environment-l1-1-0.def",
-		"api-ms-win-crt-filesystem-l1-1-0.def",
-		"api-ms-win-crt-heap-l1-1-0.def",
-		"api-ms-win-crt-locale-l1-1-0.def",
-		"api-ms-win-crt-math-l1-1-0.def.in",
-		"api-ms-win-crt-multibyte-l1-1-0.def",
-		"api-ms-win-crt-private-l1-1-0.def.in",
-		"api-ms-win-crt-process-l1-1-0.def",
-		"api-ms-win-crt-runtime-l1-1-0.def.in",
-		"api-ms-win-crt-stdio-l1-1-0.def",
-		"api-ms-win-crt-string-l1-1-0.def",
-		"api-ms-win-crt-time-l1-1-0.def",
-		"api-ms-win-crt-utility-l1-1-0.def",
-	} {
+	var libs []string
+	if goarch == "386" {
+		libs = []string{
+			// x86 uses msvcrt.dll instead of UCRT for compatibility with old
+			// Windows versions.
+			"advapi32.def.in",
+			"kernel32.def.in",
+			"msvcrt.def.in",
+		}
+	} else {
+		// Use the modernized UCRT on new systems.
+		// Normally all the api-ms-win-crt-*.def files are all compiled to a
+		// single .lib file. But to simplify things, we're going to leave them
+		// as separate files.
+		libs = []string{
+			"advapi32.def.in",
+			"kernel32.def.in",
+			"api-ms-win-crt-conio-l1-1-0.def",
+			"api-ms-win-crt-convert-l1-1-0.def.in",
+			"api-ms-win-crt-environment-l1-1-0.def",
+			"api-ms-win-crt-filesystem-l1-1-0.def",
+			"api-ms-win-crt-heap-l1-1-0.def",
+			"api-ms-win-crt-locale-l1-1-0.def",
+			"api-ms-win-crt-math-l1-1-0.def.in",
+			"api-ms-win-crt-multibyte-l1-1-0.def",
+			"api-ms-win-crt-private-l1-1-0.def.in",
+			"api-ms-win-crt-process-l1-1-0.def",
+			"api-ms-win-crt-runtime-l1-1-0.def.in",
+			"api-ms-win-crt-stdio-l1-1-0.def",
+			"api-ms-win-crt-string-l1-1-0.def",
+			"api-ms-win-crt-time-l1-1-0.def",
+			"api-ms-win-crt-utility-l1-1-0.def",
+		}
+	}
+	for _, name := range libs {
 		outpath := filepath.Join(tmpdir, filepath.Base(name)+".lib")
 		inpath := filepath.Join(root, "lib/mingw-w64/mingw-w64-crt/lib-common/"+name)
 		job := &compileJob{
@@ -93,6 +144,9 @@ func makeMinGWExtraLibs(tmpdir, goarch string) []*compileJob {
 				defpath := inpath
 				var archDef, emulation string
 				switch goarch {
+				case "386":
+					archDef = "-DDEF_I386"
+					emulation = "i386pe"
 				case "amd64":
 					archDef = "-DDEF_X64"
 					emulation = "i386pep"
@@ -12,6 +12,45 @@ import (
 	"github.com/tinygo-org/tinygo/goenv"
 )

+// Create the alltypes.h file from the appropriate alltypes.h.in files.
+func buildMuslAllTypes(arch, muslDir, outputBitsDir string) error {
+	// Create the file alltypes.h.
+	f, err := os.Create(filepath.Join(outputBitsDir, "alltypes.h"))
+	if err != nil {
+		return err
+	}
+	infiles := []string{
+		filepath.Join(muslDir, "arch", arch, "bits", "alltypes.h.in"),
+		filepath.Join(muslDir, "include", "alltypes.h.in"),
+	}
+	for _, infile := range infiles {
+		data, err := os.ReadFile(infile)
+		if err != nil {
+			return err
+		}
+		lines := strings.SplitSeq(string(data), "\n")
+		for line := range lines {
+			if strings.HasPrefix(line, "TYPEDEF ") {
+				matches := regexp.MustCompile(`TYPEDEF (.*) ([^ ]*);`).FindStringSubmatch(line)
+				value := matches[1]
+				name := matches[2]
+				line = fmt.Sprintf("#if defined(__NEED_%s) && !defined(__DEFINED_%s)\ntypedef %s %s;\n#define __DEFINED_%s\n#endif\n", name, name, value, name, name)
+			}
+			if strings.HasPrefix(line, "STRUCT ") {
+				matches := regexp.MustCompile(`STRUCT * ([^ ]*) (.*);`).FindStringSubmatch(line)
+				name := matches[1]
+				value := matches[2]
+				line = fmt.Sprintf("#if defined(__NEED_struct_%s) && !defined(__DEFINED_struct_%s)\nstruct %s %s;\n#define __DEFINED_struct_%s\n#endif\n", name, name, name, value, name)
+			}
+			_, err := f.WriteString(line + "\n")
+			if err != nil {
+				return err
+			}
+		}
+	}
+	return f.Close()
+}
+
 var libMusl = Library{
 	name: "musl",
 	makeHeaders: func(target, includeDir string) error {
@@ -24,41 +63,13 @@ var libMusl = Library{
 		arch := compileopts.MuslArchitecture(target)
 		muslDir := filepath.Join(goenv.Get("TINYGOROOT"), "lib", "musl")

-		// Create the file alltypes.h.
-		f, err := os.Create(filepath.Join(bits, "alltypes.h"))
+		err = buildMuslAllTypes(arch, muslDir, bits)
 		if err != nil {
 			return err
 		}
-		infiles := []string{
-			filepath.Join(muslDir, "arch", arch, "bits", "alltypes.h.in"),
-			filepath.Join(muslDir, "include", "alltypes.h.in"),
-		}
-		for _, infile := range infiles {
-			data, err := os.ReadFile(infile)
-			if err != nil {
-				return err
-			}
-			lines := strings.Split(string(data), "\n")
-			for _, line := range lines {
-				if strings.HasPrefix(line, "TYPEDEF ") {
-					matches := regexp.MustCompile(`TYPEDEF (.*) ([^ ]*);`).FindStringSubmatch(line)
-					value := matches[1]
-					name := matches[2]
-					line = fmt.Sprintf("#if defined(__NEED_%s) && !defined(__DEFINED_%s)\ntypedef %s %s;\n#define __DEFINED_%s\n#endif\n", name, name, value, name, name)
-				}
-				if strings.HasPrefix(line, "STRUCT ") {
-					matches := regexp.MustCompile(`STRUCT * ([^ ]*) (.*);`).FindStringSubmatch(line)
-					name := matches[1]
-					value := matches[2]
-					line = fmt.Sprintf("#if defined(__NEED_struct_%s) && !defined(__DEFINED_struct_%s)\nstruct %s %s;\n#define __DEFINED_struct_%s\n#endif\n", name, name, name, value, name)
-				}
-				f.WriteString(line + "\n")
-			}
-		}
-		f.Close()

 		// Create the file syscall.h.
-		f, err = os.Create(filepath.Join(bits, "syscall.h"))
+		f, err := os.Create(filepath.Join(bits, "syscall.h"))
 		if err != nil {
 			return err
 		}
@@ -110,30 +121,36 @@ var libMusl = Library{
 		return cflags
 	},
 	sourceDir: func() string { return filepath.Join(goenv.Get("TINYGOROOT"), "lib/musl/src") },
-	librarySources: func(target string) ([]string, error) {
+	librarySources: func(target string, _ bool) ([]string, error) {
 		arch := compileopts.MuslArchitecture(target)
 		globs := []string{
 			"conf/*.c",
+			"ctype/*.c",
 			"env/*.c",
 			"errno/*.c",
 			"exit/*.c",
 			"fcntl/*.c",
 			"internal/defsysinfo.c",
+			"internal/intscan.c",
 			"internal/libc.c",
+			"internal/shgetc.c",
 			"internal/syscall_ret.c",
 			"internal/vdso.c",
 			"legacy/*.c",
 			"locale/*.c",
 			"linux/*.c",
+			"locale/*.c",
 			"malloc/*.c",
 			"malloc/mallocng/*.c",
 			"mman/*.c",
 			"math/*.c",
 			"misc/*.c",
 			"multibyte/*.c",
+			"sched/*.c",
 			"signal/" + arch + "/*.s",
 			"signal/*.c",
 			"stdio/*.c",
+			"stdlib/*.c",
 			"string/*.c",
 			"thread/" + arch + "/*.s",
 			"thread/*.c",
@@ -43,7 +43,7 @@ var libPicolibc = Library{
 		}
 	},
 	sourceDir: func() string { return filepath.Join(goenv.Get("TINYGOROOT"), "lib/picolibc/newlib") },
-	librarySources: func(target string) ([]string, error) {
+	librarySources: func(target string, _ bool) ([]string, error) {
 		sources := append([]string(nil), picolibcSources...)
 		if !strings.HasPrefix(target, "avr") {
 			// Small chips without long jumps can't compile many files (printf,
@@ -0,0 +1,9 @@
+//go:build !windows
+
+package builder
+
+import "os"
+
+func robustRename(oldpath, newpath string) error {
+	return os.Rename(oldpath, newpath)
+}
@@ -0,0 +1,44 @@
+package builder
+
+import (
+	"errors"
+	"math/rand"
+	"os"
+	"syscall"
+	"time"
+)
+
+const robustRenameTimeout = 2 * time.Second
+
+func robustRename(oldpath, newpath string) error {
+	var bestErr error
+	start := time.Now()
+	nextSleep := time.Millisecond
+	for {
+		err := os.Rename(oldpath, newpath)
+		if err == nil || !isEphemeralRenameError(err) {
+			return err
+		}
+		if bestErr == nil {
+			bestErr = err
+		}
+		if d := time.Since(start) + nextSleep; d >= robustRenameTimeout {
+			return bestErr
+		}
+		time.Sleep(nextSleep)
+		nextSleep += time.Duration(rand.Int63n(int64(nextSleep)))
+	}
+}
+
+func isEphemeralRenameError(err error) bool {
+	var errno syscall.Errno
+	if errors.As(err, &errno) {
+		switch errno {
+		case syscall.Errno(2), // ERROR_FILE_NOT_FOUND
+			syscall.Errno(5),  // ERROR_ACCESS_DENIED
+			syscall.Errno(32): // ERROR_SHARING_VIOLATION
+			return true
+		}
+	}
+	return false
+}
@@ -490,9 +490,9 @@ func loadProgramSize(path string, packagePathMap map[string]string) (*programSiz
 				continue
 			}
 			if section.Type == elf.SHT_NOBITS {
-				if section.Name == ".stack" || section.Name == ".stack1" {
+				if strings.HasPrefix(section.Name, ".stack") {
 					// TinyGo emits stack sections on microcontroller using the
-					// ".stack" (or ".stack1") name.
+					// ".stack" name.
 					// This is a bit ugly, but I don't think there is a way to
 					// mark the stack section in a linker script.
 					sections = append(sections, memorySection{
@@ -501,8 +501,9 @@ func loadProgramSize(path string, packagePathMap map[string]string) (*programSiz
 						Align:   section.Addralign,
 						Type:    memoryStack,
 					})
-				} else {
-					// Regular .bss section.
+				} else if section.Flags&elf.SHF_WRITE != 0 {
+					// Regular .bss section. Zero-initialized RAM is always
+					// writable, so require SHF_WRITE here.
 					sections = append(sections, memorySection{
 						Address: section.Addr,
 						Size:    section.Size,
@@ -510,6 +511,11 @@ func loadProgramSize(path string, packagePathMap map[string]string) (*programSiz
 						Type:    memoryBSS,
 					})
 				}
+				// Other (non-writable) SHT_NOBITS sections are address-space
+				// placeholders that occupy no RAM, such as the ESP linker
+				// script's .irom_dummy / .rodata_dummy sections which reserve
+				// the flash-mapped XIP virtual address ranges. They must not be
+				// counted as bss/RAM usage.
 			} else if section.Type == elf.SHT_PROGBITS && section.Flags&elf.SHF_EXECINSTR != 0 {
 				// .text
 				sections = append(sections, memorySection{
@@ -954,7 +960,11 @@ func findPackagePath(path string, packagePathMap map[string]string) (packagePath
 			libPath := strings.TrimPrefix(path, filepath.Join(goenv.Get("TINYGOROOT"), "lib")+string(os.PathSeparator))
 			parts := strings.SplitN(libPath, string(os.PathSeparator), 2)
 			packagePath = "C " + parts[0]
-			filename = parts[1]
+			if len(parts) > 1 {
+				filename = parts[1]
+			} else {
+				filename = parts[0]
+			}
 		} else if prefix := filepath.Join(goenv.Get("TINYGOROOT"), "llvm-project", "compiler-rt"); strings.HasPrefix(path, prefix) {
 			packagePath = "C compiler-rt"
 			filename = strings.TrimPrefix(path, prefix+string(os.PathSeparator))
@@ -42,16 +42,15 @@ func TestBinarySize(t *testing.T) {
 	// This is a small number of very diverse targets that we want to test.
 	tests := []sizeTest{
 		// microcontrollers
-		{"hifive1b", "examples/echo", 4560, 280, 0, 2268},
-		{"microbit", "examples/serial", 2908, 388, 8, 2272},
-		{"wioterminal", "examples/pininterrupt", 7293, 1487, 116, 6912},
+		{"hifive1b", "examples/echo", 4313, 323, 0, 2260},
+		{"microbit", "examples/serial", 2838, 382, 8, 2256},
+		{"wioterminal", "examples/pininterrupt", 8027, 1665, 132, 7488},

 		// TODO: also check wasm. Right now this is difficult, because
 		// wasm binaries are run through wasm-opt and therefore the
 		// output varies by binaryen version.
 	}
 	for _, tc := range tests {
-		tc := tc
 		t.Run(tc.target+"/"+tc.path, func(t *testing.T) {
 			t.Parallel()

@@ -85,7 +84,6 @@ func TestSizeFull(t *testing.T) {
 	pkgMatch := regexp.MustCompile(`^[a-z/]+$`)    // example: "internal/task"

 	for _, target := range tests {
-		target := target
 		t.Run(target, func(t *testing.T) {
 			t.Parallel()

@@ -99,7 +97,7 @@ func TestSizeFull(t *testing.T) {
 				t.Fatal("could not read program size:", err)
 			}
 			for _, pkg := range sizes.sortedPackageNames() {
-				if pkg == "(padding)" || pkg == "(unknown)" {
+				if pkg == "(padding)" || pkg == "(unknown)" || pkg == "Go types" {
 					// TODO: correctly attribute all unknown binary size.
 					continue
 				}
@@ -28,7 +28,7 @@ func RunTool(tool string, args ...string) error {
 	var cflag *C.char
 	buf := C.calloc(C.size_t(len(args)), C.size_t(unsafe.Sizeof(cflag)))
 	defer C.free(buf)
-	cflags := (*[1 << 10]*C.char)(unsafe.Pointer(buf))[:len(args):len(args)]
+	cflags := unsafe.Slice((**C.char)(buf), len(args))
 	for i, flag := range args {
 		cflag := C.CString(flag)
 		cflags[i] = cflag
@@ -116,18 +116,24 @@ func parseLLDErrors(text string) error {
 		// This can happen in some cases like with CGo and //go:linkname tricker.
 		if matches := regexp.MustCompile(`^ld.lld(-[0-9]+)?: error: undefined symbol: (.*)\n`).FindStringSubmatch(message); matches != nil {
 			symbolName := matches[2]
-			for _, line := range strings.Split(message, "\n") {
+			for line := range strings.SplitSeq(message, "\n") {
 				matches := regexp.MustCompile(`referenced by .* \(((.*):([0-9]+))\)`).FindStringSubmatch(line)
 				if matches != nil {
 					parsedError = true
 					line, _ := strconv.Atoi(matches[3])
-					// TODO: detect common mistakes like -gc=none?
+					msg := "linker could not find symbol " + symbolName
+					switch symbolName {
+					case "runtime.alloc":
+						msg = "object allocated on the heap with -gc=none"
+					case "runtime.alloc_noheap":
+						msg = "object allocated on the heap in //go:noheap function"
+					}
 					linkErrors = append(linkErrors, scanner.Error{
 						Pos: token.Position{
 							Filename: matches[2],
 							Line:     line,
 						},
-						Msg: "linker could not find symbol " + symbolName,
+						Msg: msg,
 					})
 				}
 			}
@@ -40,7 +40,7 @@ func convertBinToUF2(input []byte, targetAddr uint32, uf2FamilyID string) ([]byt
 	}
 	bl.SetNumBlocks(len(blocks))

-	for i := 0; i < len(blocks); i++ {
+	for i := range blocks {
 		bl.SetBlockNo(i)
 		bl.SetData(blocks[i])

@@ -0,0 +1,284 @@
+package builder
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
+
+	"github.com/tinygo-org/tinygo/goenv"
+)
+
+var libWasiLibc = Library{
+	name: "wasi-libc",
+	makeHeaders: func(target, includeDir string) error {
+		bits := filepath.Join(includeDir, "bits")
+		err := os.Mkdir(bits, 0777)
+		if err != nil {
+			return err
+		}
+
+		muslDir := filepath.Join(goenv.Get("TINYGOROOT"), "lib", "wasi-libc/libc-top-half/musl")
+		err = buildMuslAllTypes("wasm32", muslDir, bits)
+		if err != nil {
+			return err
+		}
+
+		// See MUSL_OMIT_HEADERS in the Makefile.
+		omitHeaders := map[string]struct{}{
+			"syslog.h":   {},
+			"wait.h":     {},
+			"ucontext.h": {},
+			"paths.h":    {},
+			"utmp.h":     {},
+			"utmpx.h":    {},
+			"lastlog.h":  {},
+			"elf.h":      {},
+			"link.h":     {},
+			"pwd.h":      {},
+			"shadow.h":   {},
+			"grp.h":      {},
+			"mntent.h":   {},
+			"netdb.h":    {},
+			"resolv.h":   {},
+			"pty.h":      {},
+			"dlfcn.h":    {},
+			"setjmp.h":   {},
+			"ulimit.h":   {},
+			"wordexp.h":  {},
+			"spawn.h":    {},
+			"termios.h":  {},
+			"libintl.h":  {},
+			"aio.h":      {},
+
+			"stdarg.h": {},
+			"stddef.h": {},
+
+			"pthread.h": {},
+		}
+
+		for _, glob := range [][2]string{
+			{"libc-bottom-half/headers/public/*.h", ""},
+			{"libc-bottom-half/headers/public/wasi/*.h", "wasi"},
+			{"libc-top-half/musl/arch/wasm32/bits/*.h", "bits"},
+			{"libc-top-half/musl/include/*.h", ""},
+			{"libc-top-half/musl/include/netinet/*.h", "netinet"},
+			{"libc-top-half/musl/include/sys/*.h", "sys"},
+		} {
+			matches, _ := filepath.Glob(filepath.Join(goenv.Get("TINYGOROOT"), "lib/wasi-libc", glob[0]))
+			outDir := filepath.Join(includeDir, glob[1])
+			os.MkdirAll(outDir, 0o777)
+			for _, match := range matches {
+				name := filepath.Base(match)
+				if _, ok := omitHeaders[name]; ok {
+					continue
+				}
+				data, err := os.ReadFile(match)
+				if err != nil {
+					return err
+				}
+				err = os.WriteFile(filepath.Join(outDir, name), data, 0o666)
+				if err != nil {
+					return err
+				}
+			}
+		}
+
+		return nil
+	},
+	cflags: func(target, headerPath string) []string {
+		libcDir := filepath.Join(goenv.Get("TINYGOROOT"), "lib/wasi-libc")
+		return []string{
+			"-Werror",
+			"-Wall",
+			"-std=gnu11",
+			"-nostdlibinc",
+			"-mnontrapping-fptoint", "-msign-ext", "-mbulk-memory",
+			"-Wno-null-pointer-arithmetic", "-Wno-unused-parameter", "-Wno-sign-compare", "-Wno-unused-variable", "-Wno-unused-function", "-Wno-ignored-attributes", "-Wno-missing-braces", "-Wno-ignored-pragmas", "-Wno-unused-but-set-variable", "-Wno-unknown-warning-option",
+			"-Wno-parentheses", "-Wno-shift-op-parentheses", "-Wno-bitwise-op-parentheses", "-Wno-logical-op-parentheses", "-Wno-string-plus-int", "-Wno-dangling-else", "-Wno-unknown-pragmas",
+			"-DNDEBUG",
+			"-D__wasilibc_printscan_no_long_double",
+			"-D__wasilibc_printscan_full_support_option=\"long double support is disabled\"",
+			"-DBULK_MEMORY_THRESHOLD=32", // default threshold in wasi-libc
+			"-isystem", headerPath,
+			"-I" + libcDir + "/libc-top-half/musl/src/include",
+			"-I" + libcDir + "/libc-top-half/musl/src/internal",
+			"-I" + libcDir + "/libc-top-half/musl/arch/wasm32",
+			"-I" + libcDir + "/libc-top-half/musl/arch/generic",
+			"-I" + libcDir + "/libc-top-half/headers/private",
+		}
+	},
+	cflagsForFile: func(path string) []string {
+		if strings.HasPrefix(path, "libc-bottom-half"+string(os.PathSeparator)) {
+			libcDir := filepath.Join(goenv.Get("TINYGOROOT"), "lib/wasi-libc")
+			return []string{
+				"-I" + libcDir + "/libc-bottom-half/headers/private",
+				"-I" + libcDir + "/libc-bottom-half/cloudlibc/src/include",
+				"-I" + libcDir + "/libc-bottom-half/cloudlibc/src",
+			}
+		}
+		return nil
+	},
+	sourceDir: func() string { return filepath.Join(goenv.Get("TINYGOROOT"), "lib/wasi-libc") },
+	librarySources: func(target string, libcNeedsMalloc bool) ([]string, error) {
+		type filePattern struct {
+			glob    string
+			exclude []string
+		}
+
+		// See: LIBC_TOP_HALF_MUSL_SOURCES in the Makefile
+		globs := []filePattern{
+			// Top half: mostly musl sources.
+			{glob: "libc-top-half/sources/*.c"},
+			{glob: "libc-top-half/musl/src/conf/*.c"},
+			{glob: "libc-top-half/musl/src/internal/*.c", exclude: []string{
+				"procfdname.c", "syscall.c", "syscall_ret.c", "vdso.c", "version.c",
+			}},
+			{glob: "libc-top-half/musl/src/locale/*.c", exclude: []string{
+				"dcngettext.c", "textdomain.c", "bind_textdomain_codeset.c"}},
+			{glob: "libc-top-half/musl/src/math/*.c", exclude: []string{
+				"__signbit.c", "__signbitf.c", "__signbitl.c",
+				"__fpclassify.c", "__fpclassifyf.c", "__fpclassifyl.c",
+				"ceilf.c", "ceil.c",
+				"floorf.c", "floor.c",
+				"truncf.c", "trunc.c",
+				"rintf.c", "rint.c",
+				"nearbyintf.c", "nearbyint.c",
+				"sqrtf.c", "sqrt.c",
+				"fabsf.c", "fabs.c",
+				"copysignf.c", "copysign.c",
+				"fminf.c", "fmaxf.c",
+				"fmin.c", "fmax.c,",
+			}},
+			{glob: "libc-top-half/musl/src/multibyte/*.c"},
+			{glob: "libc-top-half/musl/src/stdio/*.c", exclude: []string{
+				"vfwscanf.c", "vfwprintf.c", // long double is unsupported
+				"__lockfile.c", "flockfile.c", "funlockfile.c", "ftrylockfile.c",
+				"rename.c",
+				"tmpnam.c", "tmpfile.c", "tempnam.c",
+				"popen.c", "pclose.c",
+				"remove.c",
+				"gets.c"}},
+			{glob: "libc-top-half/musl/src/stdlib/*.c"},
+			{glob: "libc-top-half/musl/src/string/*.c", exclude: []string{
+				"strsignal.c"}},
+
+			// Bottom half: connect top half to WASI equivalents.
+			{glob: "libc-bottom-half/cloudlibc/src/libc/*/*.c"},
+			{glob: "libc-bottom-half/cloudlibc/src/libc/sys/*/*.c"},
+			{glob: "libc-bottom-half/sources/*.c"},
+		}
+
+		// We're using the Boehm GC, so we need a heap implementation in the libc.
+		if libcNeedsMalloc {
+			globs = append(globs, filePattern{glob: "dlmalloc/src/dlmalloc.c"})
+		}
+
+		// See: LIBC_TOP_HALF_MUSL_SOURCES in the Makefile
+		sources := []string{
+			"libc-top-half/musl/src/misc/a64l.c",
+			"libc-top-half/musl/src/misc/basename.c",
+			"libc-top-half/musl/src/misc/dirname.c",
+			"libc-top-half/musl/src/misc/ffs.c",
+			"libc-top-half/musl/src/misc/ffsl.c",
+			"libc-top-half/musl/src/misc/ffsll.c",
+			"libc-top-half/musl/src/misc/fmtmsg.c",
+			"libc-top-half/musl/src/misc/getdomainname.c",
+			"libc-top-half/musl/src/misc/gethostid.c",
+			"libc-top-half/musl/src/misc/getopt.c",
+			"libc-top-half/musl/src/misc/getopt_long.c",
+			"libc-top-half/musl/src/misc/getsubopt.c",
+			"libc-top-half/musl/src/misc/uname.c",
+			"libc-top-half/musl/src/misc/nftw.c",
+			"libc-top-half/musl/src/errno/strerror.c",
+			"libc-top-half/musl/src/network/htonl.c",
+			"libc-top-half/musl/src/network/htons.c",
+			"libc-top-half/musl/src/network/ntohl.c",
+			"libc-top-half/musl/src/network/ntohs.c",
+			"libc-top-half/musl/src/network/inet_ntop.c",
+			"libc-top-half/musl/src/network/inet_pton.c",
+			"libc-top-half/musl/src/network/inet_aton.c",
+			"libc-top-half/musl/src/network/in6addr_any.c",
+			"libc-top-half/musl/src/network/in6addr_loopback.c",
+			"libc-top-half/musl/src/fenv/fenv.c",
+			"libc-top-half/musl/src/fenv/fesetround.c",
+			"libc-top-half/musl/src/fenv/feupdateenv.c",
+			"libc-top-half/musl/src/fenv/fesetexceptflag.c",
+			"libc-top-half/musl/src/fenv/fegetexceptflag.c",
+			"libc-top-half/musl/src/fenv/feholdexcept.c",
+			"libc-top-half/musl/src/exit/exit.c",
+			"libc-top-half/musl/src/exit/atexit.c",
+			"libc-top-half/musl/src/exit/assert.c",
+			"libc-top-half/musl/src/exit/quick_exit.c",
+			"libc-top-half/musl/src/exit/at_quick_exit.c",
+			"libc-top-half/musl/src/time/strftime.c",
+			"libc-top-half/musl/src/time/asctime.c",
+			"libc-top-half/musl/src/time/asctime_r.c",
+			"libc-top-half/musl/src/time/ctime.c",
+			"libc-top-half/musl/src/time/ctime_r.c",
+			"libc-top-half/musl/src/time/wcsftime.c",
+			"libc-top-half/musl/src/time/strptime.c",
+			"libc-top-half/musl/src/time/difftime.c",
+			"libc-top-half/musl/src/time/timegm.c",
+			"libc-top-half/musl/src/time/ftime.c",
+			"libc-top-half/musl/src/time/gmtime.c",
+			"libc-top-half/musl/src/time/gmtime_r.c",
+			"libc-top-half/musl/src/time/timespec_get.c",
+			"libc-top-half/musl/src/time/getdate.c",
+			"libc-top-half/musl/src/time/localtime.c",
+			"libc-top-half/musl/src/time/localtime_r.c",
+			"libc-top-half/musl/src/time/mktime.c",
+			"libc-top-half/musl/src/time/__tm_to_secs.c",
+			"libc-top-half/musl/src/time/__month_to_secs.c",
+			"libc-top-half/musl/src/time/__secs_to_tm.c",
+			"libc-top-half/musl/src/time/__year_to_secs.c",
+			"libc-top-half/musl/src/time/__tz.c",
+			"libc-top-half/musl/src/fcntl/creat.c",
+			"libc-top-half/musl/src/dirent/alphasort.c",
+			"libc-top-half/musl/src/dirent/versionsort.c",
+			"libc-top-half/musl/src/env/__stack_chk_fail.c",
+			"libc-top-half/musl/src/env/clearenv.c",
+			"libc-top-half/musl/src/env/getenv.c",
+			"libc-top-half/musl/src/env/putenv.c",
+			"libc-top-half/musl/src/env/setenv.c",
+			"libc-top-half/musl/src/env/unsetenv.c",
+			"libc-top-half/musl/src/unistd/posix_close.c",
+			"libc-top-half/musl/src/stat/futimesat.c",
+			"libc-top-half/musl/src/legacy/getpagesize.c",
+			"libc-top-half/musl/src/thread/thrd_sleep.c",
+		}
+
+		basepath := goenv.Get("TINYGOROOT") + "/lib/wasi-libc/"
+		for _, pattern := range globs {
+			matches, err := filepath.Glob(basepath + pattern.glob)
+			if err != nil {
+				// From the documentation:
+				// > Glob ignores file system errors such as I/O errors reading
+				// > directories. The only possible returned error is
+				// > ErrBadPattern, when pattern is malformed.
+				// So the only possible error is when the (statically defined)
+				// pattern is wrong. In other words, a programming bug.
+				return nil, fmt.Errorf("wasi-libc: could not glob source dirs: %w", err)
+			}
+			if len(matches) == 0 {
+				return nil, fmt.Errorf("wasi-libc: did not find any files for pattern %#v", pattern)
+			}
+			excludeSet := map[string]struct{}{}
+			for _, exclude := range pattern.exclude {
+				excludeSet[exclude] = struct{}{}
+			}
+			for _, match := range matches {
+				if _, ok := excludeSet[filepath.Base(match)]; ok {
+					continue
+				}
+				relpath, err := filepath.Rel(basepath, match)
+				if err != nil {
+					// Not sure if this is even possible.
+					return nil, err
+				}
+				sources = append(sources, relpath)
+			}
+		}
+		return sources, nil
+	},
+}
@@ -29,6 +29,8 @@ var libWasmBuiltins = Library{
 			"-Wall",
 			"-std=gnu11",
 			"-nostdlibinc",
+			"-mnontrapping-fptoint", // match wasm-unknown (default on in LLVM 20)
+			"-mno-bulk-memory",      // same here
 			"-isystem", libcDir + "/libc-top-half/musl/arch/wasm32",
 			"-isystem", libcDir + "/libc-top-half/musl/arch/generic",
 			"-isystem", libcDir + "/libc-top-half/musl/src/internal",
@@ -39,7 +41,7 @@ var libWasmBuiltins = Library{
 		}
 	},
 	sourceDir: func() string { return filepath.Join(goenv.Get("TINYGOROOT"), "lib/wasi-libc") },
-	librarySources: func(target string) ([]string, error) {
+	librarySources: func(target string, _ bool) ([]string, error) {
 		return []string{
 			// memory builtins needed for llvm.memcpy.*, llvm.memmove.*, and
 			// llvm.memset.* LLVM intrinsics.
@@ -26,10 +26,6 @@ import (
 	"golang.org/x/tools/go/ast/astutil"
 )

-// Function that's only defined in Go 1.22.
-var setASTFileFields = func(f *ast.File, start, end token.Pos) {
-}
-
 // cgoPackage holds all CGo-related information of a package.
 type cgoPackage struct {
 	generated       *ast.File
@@ -44,7 +40,7 @@ type cgoPackage struct {
 	tokenFiles      map[string]*token.File
 	definedGlobally map[string]ast.Node
 	noescapingFuncs map[string]*noescapingFunc // #cgo noescape lines
-	anonDecls       map[interface{}]string
+	anonDecls       map[any]string
 	cflags          []string // CFlags from #cgo lines
 	ldflags         []string // LDFlags from #cgo lines
 	visitedFiles    map[string][]byte
@@ -92,18 +88,18 @@ type noescapingFunc struct {
 // cgoAliases list type aliases between Go and C, for types that are equivalent
 // in both languages. See addTypeAliases.
 var cgoAliases = map[string]string{
-	"C.int8_t":    "int8",
-	"C.int16_t":   "int16",
-	"C.int32_t":   "int32",
-	"C.int64_t":   "int64",
-	"C.uint8_t":   "uint8",
-	"C.uint16_t":  "uint16",
-	"C.uint32_t":  "uint32",
-	"C.uint64_t":  "uint64",
-	"C.uintptr_t": "uintptr",
-	"C.float":     "float32",
-	"C.double":    "float64",
-	"C._Bool":     "bool",
+	"_Cgo_int8_t":    "int8",
+	"_Cgo_int16_t":   "int16",
+	"_Cgo_int32_t":   "int32",
+	"_Cgo_int64_t":   "int64",
+	"_Cgo_uint8_t":   "uint8",
+	"_Cgo_uint16_t":  "uint16",
+	"_Cgo_uint32_t":  "uint32",
+	"_Cgo_uint64_t":  "uint64",
+	"_Cgo_uintptr_t": "uintptr",
+	"_Cgo_float":     "float32",
+	"_Cgo_double":    "float64",
+	"_Cgo__Bool":     "bool",
 }

 // builtinAliases are handled specially because they only exist on the Go side
@@ -145,48 +141,46 @@ typedef unsigned long long  _Cgo_ulonglong;
 // The string/bytes functions below implement C.CString etc. To make sure the
 // runtime doesn't need to know the C int type, lengths are converted to uintptr
 // first.
-// These functions will be modified to get a "C." prefix, so the source below
-// doesn't reflect the final AST.
 const generatedGoFilePrefixBase = `
 import "syscall"
 import "unsafe"

 var _ unsafe.Pointer

-//go:linkname C.CString runtime.cgo_CString
-func CString(string) *C.char
+//go:linkname _Cgo_CString runtime.cgo_CString
+func _Cgo_CString(string) *_Cgo_char

-//go:linkname C.GoString runtime.cgo_GoString
-func GoString(*C.char) string
+//go:linkname _Cgo_GoString runtime.cgo_GoString
+func _Cgo_GoString(*_Cgo_char) string

-//go:linkname C.__GoStringN runtime.cgo_GoStringN
-func __GoStringN(*C.char, uintptr) string
+//go:linkname _Cgo___GoStringN runtime.cgo_GoStringN
+func _Cgo___GoStringN(*_Cgo_char, uintptr) string

-func GoStringN(cstr *C.char, length C.int) string {
-	return C.__GoStringN(cstr, uintptr(length))
+func _Cgo_GoStringN(cstr *_Cgo_char, length _Cgo_int) string {
+	return _Cgo___GoStringN(cstr, uintptr(length))
 }

-//go:linkname C.__GoBytes runtime.cgo_GoBytes
-func __GoBytes(unsafe.Pointer, uintptr) []byte
+//go:linkname _Cgo___GoBytes runtime.cgo_GoBytes
+func _Cgo___GoBytes(unsafe.Pointer, uintptr) []byte

-func GoBytes(ptr unsafe.Pointer, length C.int) []byte {
-	return C.__GoBytes(ptr, uintptr(length))
+func _Cgo_GoBytes(ptr unsafe.Pointer, length _Cgo_int) []byte {
+	return _Cgo___GoBytes(ptr, uintptr(length))
 }

-//go:linkname C.__CBytes runtime.cgo_CBytes
-func __CBytes([]byte) unsafe.Pointer
+//go:linkname _Cgo___CBytes runtime.cgo_CBytes
+func _Cgo___CBytes([]byte) unsafe.Pointer

-func CBytes(b []byte) unsafe.Pointer {
-	return C.__CBytes(b)
+func _Cgo_CBytes(b []byte) unsafe.Pointer {
+	return _Cgo___CBytes(b)
 }

-//go:linkname C.__get_errno_num runtime.cgo_errno
-func __get_errno_num() uintptr
+//go:linkname _Cgo___get_errno_num runtime.cgo_errno
+func _Cgo___get_errno_num() uintptr
 `

 const generatedGoFilePrefixOther = generatedGoFilePrefixBase + `
-func __get_errno() error {
-	return syscall.Errno(C.__get_errno_num())
+func _Cgo___get_errno() error {
+	return syscall.Errno(_Cgo___get_errno_num())
 }
 `

@@ -197,7 +191,7 @@ func __get_errno() error {
 // map the errno values to match the values in the syscall package.
 // Source of the errno values: lib/mingw-w64/mingw-w64-headers/crt/errno.h
 const generatedGoFilePrefixWindows = generatedGoFilePrefixBase + `
-var __errno_mapping = [...]syscall.Errno{
+var _Cgo___errno_mapping = [...]syscall.Errno{
 	1:  syscall.EPERM,
 	2:  syscall.ENOENT,
 	3:  syscall.ESRCH,
@@ -238,10 +232,10 @@ var __errno_mapping = [...]syscall.Errno{
 	42: syscall.EILSEQ,
 }

-func __get_errno() error {
-	num := C.__get_errno_num()
-	if num < uintptr(len(__errno_mapping)) {
-		if mapped := __errno_mapping[num]; mapped != 0 {
+func _Cgo___get_errno() error {
+	num := _Cgo___get_errno_num()
+	if num < uintptr(len(_Cgo___errno_mapping)) {
+		if mapped := _Cgo___errno_mapping[num]; mapped != 0 {
 			return mapped
 		}
 	}
@@ -265,7 +259,7 @@ func Process(files []*ast.File, dir, importPath string, fset *token.FileSet, cfl
 		tokenFiles:      map[string]*token.File{},
 		definedGlobally: map[string]ast.Node{},
 		noescapingFuncs: map[string]*noescapingFunc{},
-		anonDecls:       map[interface{}]string{},
+		anonDecls:       map[any]string{},
 		visitedFiles:    map[string][]byte{},
 	}

@@ -304,28 +298,11 @@ func Process(files []*ast.File, dir, importPath string, fset *token.FileSet, cfl
 	// If the Comments field is not set to nil, the go/format package will get
 	// confused about where comments should go.
 	p.generated.Comments = nil
-	// Adjust some of the functions in there.
-	for _, decl := range p.generated.Decls {
-		switch decl := decl.(type) {
-		case *ast.FuncDecl:
-			switch decl.Name.Name {
-			case "CString", "GoString", "GoStringN", "__GoStringN", "GoBytes", "__GoBytes", "CBytes", "__CBytes", "__get_errno_num", "__get_errno", "__errno_mapping":
-				// Adjust the name to have a "C." prefix so it is correctly
-				// resolved.
-				decl.Name.Name = "C." + decl.Name.Name
-			}
-		}
-	}
-	// Patch some types, for example *C.char in C.CString.
-	cf := p.newCGoFile(nil, -1) // dummy *cgoFile for the walker
-	astutil.Apply(p.generated, func(cursor *astutil.Cursor) bool {
-		return cf.walker(cursor, nil)
-	}, nil)

 	// Find `import "C"` C fragments in the file.
 	p.cgoHeaders = make([]string, len(files)) // combined CGo header fragment for each file
 	for i, f := range files {
-		var cgoHeader string
+		var cgoHeader strings.Builder
 		for i := 0; i < len(f.Decls); i++ {
 			decl := f.Decls[i]
 			genDecl, ok := decl.(*ast.GenDecl)
@@ -360,7 +337,8 @@ func Process(files []*ast.File, dir, importPath string, fset *token.FileSet, cfl
 			// Iterate through all parts of the CGo header. Note that every //
 			// line is a new comment.
 			position := fset.Position(genDecl.Doc.Pos())
-			fragment := fmt.Sprintf("# %d %#v\n", position.Line, position.Filename)
+			var fragment strings.Builder
+			fragment.WriteString(fmt.Sprintf("# %d %#v\n", position.Line, position.Filename))
 			for _, comment := range genDecl.Doc.List {
 				// Find all #cgo lines, extract and use their contents, and
 				// replace the lines with spaces (to preserve locations).
@@ -377,12 +355,13 @@ func Process(files []*ast.File, dir, importPath string, fset *token.FileSet, cfl
 				} else { // comment
 					c = "  " + c[2:len(c)-2]
 				}
-				fragment += c + "\n"
+				fragment.WriteString(c)
+				fragment.WriteByte('\n')
 			}
-			cgoHeader += fragment
+			cgoHeader.WriteString(fragment.String())
 		}

-		p.cgoHeaders[i] = cgoHeader
+		p.cgoHeaders[i] = cgoHeader.String()
 	}

 	// Define CFlags that will be used while parsing the package.
@@ -399,7 +378,7 @@ func Process(files []*ast.File, dir, importPath string, fset *token.FileSet, cfl
 			Tok:    token.TYPE,
 		}
 		for _, name := range builtinAliases {
-			typeSpec := p.getIntegerType("C."+name, names["_Cgo_"+name])
+			typeSpec := p.getIntegerType("_Cgo_"+name, names["_Cgo_"+name])
 			gen.Specs = append(gen.Specs, typeSpec)
 		}
 		p.generated.Decls = append(p.generated.Decls, gen)
@@ -673,7 +652,6 @@ func (p *cgoPackage) createUnionAccessor(field *ast.Field, typeName string) {
 		X: &ast.Ident{
 			NamePos: pos,
 			Name:    "union",
-			Obj:     nil,
 		},
 		Sel: &ast.Ident{
 			NamePos: pos,
@@ -727,7 +705,6 @@ func (p *cgoPackage) createUnionAccessor(field *ast.Field, typeName string) {
 						X: &ast.Ident{
 							NamePos: pos,
 							Name:    typeName,
-							Obj:     nil,
 						},
 					},
 				},
@@ -783,7 +760,6 @@ func (p *cgoPackage) createBitfieldGetter(bitfield bitfieldInfo, typeName string
 		X: &ast.Ident{
 			NamePos: bitfield.pos,
 			Name:    "s",
-			Obj:     nil,
 		},
 		Sel: &ast.Ident{
 			NamePos: bitfield.pos,
@@ -830,11 +806,6 @@ func (p *cgoPackage) createBitfieldGetter(bitfield bitfieldInfo, typeName string
 						{
 							NamePos: bitfield.pos,
 							Name:    "s",
-							Obj: &ast.Object{
-								Kind: ast.Var,
-								Name: "s",
-								Decl: nil,
-							},
 						},
 					},
 					Type: &ast.StarExpr{
@@ -842,7 +813,6 @@ func (p *cgoPackage) createBitfieldGetter(bitfield bitfieldInfo, typeName string
 						X: &ast.Ident{
 							NamePos: bitfield.pos,
 							Name:    typeName,
-							Obj:     nil,
 						},
 					},
 				},
@@ -900,7 +870,6 @@ func (p *cgoPackage) createBitfieldSetter(bitfield bitfieldInfo, typeName string
 		X: &ast.Ident{
 			NamePos: bitfield.pos,
 			Name:    "s",
-			Obj:     nil,
 		},
 		Sel: &ast.Ident{
 			NamePos: bitfield.pos,
@@ -983,11 +952,6 @@ func (p *cgoPackage) createBitfieldSetter(bitfield bitfieldInfo, typeName string
 						{
 							NamePos: bitfield.pos,
 							Name:    "s",
-							Obj: &ast.Object{
-								Kind: ast.Var,
-								Name: "s",
-								Decl: nil,
-							},
 						},
 					},
 					Type: &ast.StarExpr{
@@ -995,7 +959,6 @@ func (p *cgoPackage) createBitfieldSetter(bitfield bitfieldInfo, typeName string
 						X: &ast.Ident{
 							NamePos: bitfield.pos,
 							Name:    typeName,
-							Obj:     nil,
 						},
 					},
 				},
@@ -1016,7 +979,6 @@ func (p *cgoPackage) createBitfieldSetter(bitfield bitfieldInfo, typeName string
 							{
 								NamePos: bitfield.pos,
 								Name:    "value",
-								Obj:     nil,
 							},
 						},
 						Type: bitfield.field.Type,
@@ -1034,7 +996,6 @@ func (p *cgoPackage) createBitfieldSetter(bitfield bitfieldInfo, typeName string
 							X: &ast.Ident{
 								NamePos: bitfield.pos,
 								Name:    "s",
-								Obj:     nil,
 							},
 							Sel: &ast.Ident{
 								NamePos: bitfield.pos,
@@ -1258,7 +1219,7 @@ func getPos(node ast.Node) token.Pos {
 // getUnnamedDeclName creates a name (with the given prefix) for the given C
 // declaration. This is used for structs, unions, and enums that are often
 // defined without a name and used in a typedef.
-func (p *cgoPackage) getUnnamedDeclName(prefix string, itf interface{}) string {
+func (p *cgoPackage) getUnnamedDeclName(prefix string, itf any) string {
 	if name, ok := p.anonDecls[itf]; ok {
 		return name
 	}
@@ -1272,7 +1233,7 @@ func (p *cgoPackage) getUnnamedDeclName(prefix string, itf interface{}) string {
 func (f *cgoFile) getASTDeclName(name string, found clangCursor, iscall bool) string {
 	// Some types are defined in stdint.h and map directly to a particular Go
 	// type.
-	if alias := cgoAliases["C."+name]; alias != "" {
+	if alias := cgoAliases["_Cgo_"+name]; alias != "" {
 		return alias
 	}
 	node := f.getASTDeclNode(name, found)
@@ -1282,7 +1243,7 @@ func (f *cgoFile) getASTDeclName(name string, found clangCursor, iscall bool) st
 		}
 		return node.Name.Name
 	}
-	return "C." + name
+	return "_Cgo_" + name
 }

 // getASTDeclNode will declare the given C AST node (if not already defined) and
@@ -1382,8 +1343,8 @@ extern __typeof(%s) %s __attribute__((alias(%#v)));
 	case *elaboratedTypeInfo:
 		// Add struct bitfields.
 		for _, bitfield := range elaboratedType.bitfields {
-			f.createBitfieldGetter(bitfield, "C."+name)
-			f.createBitfieldSetter(bitfield, "C."+name)
+			f.createBitfieldGetter(bitfield, "_Cgo_"+name)
+			f.createBitfieldSetter(bitfield, "_Cgo_"+name)
 		}
 		if elaboratedType.unionSize != 0 {
 			// Create union getters/setters.
@@ -1392,7 +1353,7 @@ extern __typeof(%s) %s __attribute__((alias(%#v)));
 					f.addError(elaboratedType.pos, fmt.Sprintf("union must have field with a single name, it has %d names", len(field.Names)))
 					continue
 				}
-				f.createUnionAccessor(field, "C."+name)
+				f.createUnionAccessor(field, "_Cgo_"+name)
 			}
 		}
 	}
@@ -1441,7 +1402,7 @@ func (f *cgoFile) walker(cursor *astutil.Cursor, names map[string]clangCursor) b
 			node.Rhs = append(node.Rhs, &ast.CallExpr{
 				Fun: &ast.Ident{
 					NamePos: node.Lhs[1].End(),
-					Name:    "C.__get_errno",
+					Name:    "_Cgo___get_errno",
 				},
 			})
 		}
@@ -1466,7 +1427,7 @@ func (f *cgoFile) walker(cursor *astutil.Cursor, names map[string]clangCursor) b
 			return true
 		}
 		if x.Name == "C" {
-			name := "C." + node.Sel.Name
+			name := "_Cgo_" + node.Sel.Name
 			if found, ok := names[node.Sel.Name]; ok {
 				name = f.getASTDeclName(node.Sel.Name, found, false)
 			}
@@ -1,17 +0,0 @@
-//go:build go1.22
-
-package cgo
-
-// Code specifically for Go 1.22.
-
-import (
-	"go/ast"
-	"go/token"
-)
-
-func init() {
-	setASTFileFields = func(f *ast.File, start, end token.Pos) {
-		f.FileStart = start
-		f.FileEnd = end
-	}
-}
@@ -45,7 +45,6 @@ func TestCGo(t *testing.T) {
 		"flags",
 		"const",
 	} {
-		name := name // avoid a race condition
 		t.Run(name, func(t *testing.T) {
 			// Read the AST in memory.
 			path := filepath.Join("testdata", name+".go")
@@ -71,7 +71,7 @@ unsigned tinygo_clang_Cursor_isMacroFunctionLike(GoCXCursor c);
 //     libclang.go:68:5: note: previous declaration is here
 // See: https://github.com/golang/go/issues/49721
 #if defined(_WIN32)
-#define CGO_DECL // __declspec(dllexport)
+#define CGO_DECL __declspec(dllexport)
 #else
 #define CGO_DECL
 #endif
@@ -130,7 +130,7 @@ func (f *cgoFile) readNames(fragment string, cflags []string, filename string, c
 	// convert Go slice of strings to C array of strings.
 	cmdargsC := C.malloc(C.size_t(len(cflags)) * C.size_t(unsafe.Sizeof(uintptr(0))))
 	defer C.free(cmdargsC)
-	cmdargs := (*[1 << 16]*C.char)(cmdargsC)
+	cmdargs := unsafe.Slice((**C.char)(cmdargsC), len(cflags))
 	for i, cflag := range cflags {
 		s := C.CString(cflag)
 		cmdargs[i] = s
@@ -160,7 +160,7 @@ func (f *cgoFile) readNames(fragment string, cflags []string, filename string, c
 			pos := f.getClangLocationPosition(location, unit)
 			f.addError(pos, severity+": "+spelling)
 		}
-		for i := 0; i < numDiagnostics; i++ {
+		for i := range numDiagnostics {
 			diagnostic := C.clang_getDiagnostic(unit, C.uint(i))
 			addDiagnostic(diagnostic)

@@ -190,7 +190,7 @@ func (f *cgoFile) readNames(fragment string, cflags []string, filename string, c
 			// Sanity check. This should (hopefully) never trigger.
 			panic("libclang: file contents was not loaded")
 		}
-		data := (*[1 << 24]byte)(unsafe.Pointer(rawData))[:size]
+		data := unsafe.Slice((*byte)(unsafe.Pointer(rawData)), size)

 		// Hash the contents if it isn't hashed yet.
 		if _, ok := f.visitedFiles[path]; !ok {
@@ -217,10 +217,6 @@ func (f *cgoFile) createASTNode(name string, c clangCursor) (ast.Node, any) {
 	case C.CXCursor_FunctionDecl:
 		cursorType := C.tinygo_clang_getCursorType(c)
 		numArgs := int(C.tinygo_clang_Cursor_getNumArguments(c))
-		obj := &ast.Object{
-			Kind: ast.Fun,
-			Name: "C." + name,
-		}
 		exportName := name
 		localName := name
 		var stringSignature string
@@ -257,8 +253,7 @@ func (f *cgoFile) createASTNode(name string, c clangCursor) (ast.Node, any) {
 			},
 			Name: &ast.Ident{
 				NamePos: pos,
-				Name:    "C." + localName,
-				Obj:     obj,
+				Name:    "_Cgo_" + localName,
 			},
 			Type: &ast.FuncType{
 				Func: pos,
@@ -283,7 +278,7 @@ func (f *cgoFile) createASTNode(name string, c clangCursor) (ast.Node, any) {
 				Text:  strings.Join(doc, "\n"),
 			})
 		}
-		for i := 0; i < numArgs; i++ {
+		for i := range numArgs {
 			arg := C.tinygo_clang_Cursor_getArgument(c, C.uint(i))
 			argName := getString(C.tinygo_clang_getCursorSpelling(arg))
 			argType := C.clang_getArgType(cursorType, C.uint(i))
@@ -295,11 +290,6 @@ func (f *cgoFile) createASTNode(name string, c clangCursor) (ast.Node, any) {
 					{
 						NamePos: pos,
 						Name:    argName,
-						Obj: &ast.Object{
-							Kind: ast.Var,
-							Name: argName,
-							Decl: decl,
-						},
 					},
 				},
 				Type: f.makeDecayingASTType(argType, pos),
@@ -315,49 +305,34 @@ func (f *cgoFile) createASTNode(name string, c clangCursor) (ast.Node, any) {
 				},
 			}
 		}
-		obj.Decl = decl
 		return decl, stringSignature
 	case C.CXCursor_StructDecl, C.CXCursor_UnionDecl:
 		typ := f.makeASTRecordType(c, pos)
-		typeName := "C." + name
+		typeName := "_Cgo_" + name
 		typeExpr := typ.typeExpr
 		if typ.unionSize != 0 {
 			// Convert to a single-field struct type.
 			typeExpr = f.makeUnionField(typ)
 		}
-		obj := &ast.Object{
-			Kind: ast.Typ,
-			Name: typeName,
-		}
 		typeSpec := &ast.TypeSpec{
 			Name: &ast.Ident{
 				NamePos: typ.pos,
 				Name:    typeName,
-				Obj:     obj,
 			},
 			Type: typeExpr,
 		}
-		obj.Decl = typeSpec
 		return typeSpec, typ
 	case C.CXCursor_TypedefDecl:
-		typeName := "C." + name
+		typeName := "_Cgo_" + name
 		underlyingType := C.tinygo_clang_getTypedefDeclUnderlyingType(c)
-		obj := &ast.Object{
-			Kind: ast.Typ,
-			Name: typeName,
-		}
 		typeSpec := &ast.TypeSpec{
 			Name: &ast.Ident{
 				NamePos: pos,
 				Name:    typeName,
-				Obj:     obj,
 			},
-			Type: f.makeASTType(underlyingType, pos),
+			Assign: pos,
+			Type:   f.makeASTType(underlyingType, pos),
 		}
-		if underlyingType.kind != C.CXType_Enum {
-			typeSpec.Assign = pos
-		}
-		obj.Decl = typeSpec
 		return typeSpec, nil
 	case C.CXCursor_VarDecl:
 		cursorType := C.tinygo_clang_getCursorType(c)
@@ -376,19 +351,13 @@ func (f *cgoFile) createASTNode(name string, c clangCursor) (ast.Node, any) {
 				},
 			},
 		}
-		obj := &ast.Object{
-			Kind: ast.Var,
-			Name: "C." + name,
-		}
 		valueSpec := &ast.ValueSpec{
 			Names: []*ast.Ident{{
 				NamePos: pos,
-				Name:    "C." + name,
-				Obj:     obj,
+				Name:    "_Cgo_" + name,
 			}},
 			Type: typeExpr,
 		}
-		obj.Decl = valueSpec
 		gen.Specs = append(gen.Specs, valueSpec)
 		return gen, nil
 	case C.CXCursor_MacroDefinition:
@@ -405,39 +374,27 @@ func (f *cgoFile) createASTNode(name string, c clangCursor) (ast.Node, any) {
 			Lparen: token.NoPos,
 			Rparen: token.NoPos,
 		}
-		obj := &ast.Object{
-			Kind: ast.Con,
-			Name: "C." + name,
-		}
 		valueSpec := &ast.ValueSpec{
 			Names: []*ast.Ident{{
 				NamePos: pos,
-				Name:    "C." + name,
-				Obj:     obj,
+				Name:    "_Cgo_" + name,
 			}},
 			Values: []ast.Expr{expr},
 		}
-		obj.Decl = valueSpec
 		gen.Specs = append(gen.Specs, valueSpec)
 		return gen, nil
 	case C.CXCursor_EnumDecl:
-		obj := &ast.Object{
-			Kind: ast.Typ,
-			Name: "C." + name,
-		}
 		underlying := C.tinygo_clang_getEnumDeclIntegerType(c)
 		// TODO: gc's CGo implementation uses types such as `uint32` for enums
 		// instead of types such as C.int, which are used here.
 		typeSpec := &ast.TypeSpec{
 			Name: &ast.Ident{
 				NamePos: pos,
-				Name:    "C." + name,
-				Obj:     obj,
+				Name:    "_Cgo_" + name,
 			},
 			Assign: pos,
 			Type:   f.makeASTType(underlying, pos),
 		}
-		obj.Decl = typeSpec
 		return typeSpec, nil
 	case C.CXCursor_EnumConstantDecl:
 		value := C.tinygo_clang_getEnumConstantDeclValue(c)
@@ -452,19 +409,13 @@ func (f *cgoFile) createASTNode(name string, c clangCursor) (ast.Node, any) {
 			Lparen: token.NoPos,
 			Rparen: token.NoPos,
 		}
-		obj := &ast.Object{
-			Kind: ast.Con,
-			Name: "C." + name,
-		}
 		valueSpec := &ast.ValueSpec{
 			Names: []*ast.Ident{{
 				NamePos: pos,
-				Name:    "C." + name,
-				Obj:     obj,
+				Name:    "_Cgo_" + name,
 			}},
 			Values: []ast.Expr{expr},
 		}
-		obj.Decl = valueSpec
 		gen.Specs = append(gen.Specs, valueSpec)
 		return gen, nil
 	default:
@@ -581,7 +532,7 @@ func tinygo_clang_globals_visitor(c, parent C.GoCXCursor, client_data C.CXClient

 // Get the precise location in the source code. Used for uniquely identifying
 // source locations.
-func (f *cgoFile) getUniqueLocationID(pos token.Pos, cursor C.GoCXCursor) interface{} {
+func (f *cgoFile) getUniqueLocationID(pos token.Pos, cursor C.GoCXCursor) any {
 	clangLocation := C.tinygo_clang_getCursorLocation(cursor)
 	var file C.CXFile
 	var line C.unsigned
@@ -624,7 +575,7 @@ func (p *cgoPackage) getClangLocationPosition(location C.CXSourceLocation, tu C.
 		// now by reading the file from libclang.
 		var size C.size_t
 		sourcePtr := C.clang_getFileContents(tu, file, &size)
-		source := ((*[1 << 28]byte)(unsafe.Pointer(sourcePtr)))[:size:size]
+		source := unsafe.Slice((*byte)(unsafe.Pointer(sourcePtr)), size)
 		lines := []int{0}
 		for i := 0; i < len(source)-1; i++ {
 			if source[i] == '\n' {
@@ -639,7 +590,8 @@ func (p *cgoPackage) getClangLocationPosition(location C.CXSourceLocation, tu C.
 			Package: f.Pos(0),
 			Name:    ast.NewIdent(p.packageName),
 		}
-		setASTFileFields(astFile, f.Pos(0), f.Pos(int(size)))
+		astFile.FileStart = f.Pos(0)
+		astFile.FileEnd = f.Pos(int(size))
 		p.cgoFiles = append(p.cgoFiles, astFile)
 	}
 	positionFile := p.tokenFiles[filename]
@@ -745,27 +697,27 @@ func (f *cgoFile) makeASTType(typ C.CXType, pos token.Pos) ast.Expr {
 	var typeName string
 	switch typ.kind {
 	case C.CXType_Char_S, C.CXType_Char_U:
-		typeName = "C.char"
+		typeName = "_Cgo_char"
 	case C.CXType_SChar:
-		typeName = "C.schar"
+		typeName = "_Cgo_schar"
 	case C.CXType_UChar:
-		typeName = "C.uchar"
+		typeName = "_Cgo_uchar"
 	case C.CXType_Short:
-		typeName = "C.short"
+		typeName = "_Cgo_short"
 	case C.CXType_UShort:
-		typeName = "C.ushort"
+		typeName = "_Cgo_ushort"
 	case C.CXType_Int:
-		typeName = "C.int"
+		typeName = "_Cgo_int"
 	case C.CXType_UInt:
-		typeName = "C.uint"
+		typeName = "_Cgo_uint"
 	case C.CXType_Long:
-		typeName = "C.long"
+		typeName = "_Cgo_long"
 	case C.CXType_ULong:
-		typeName = "C.ulong"
+		typeName = "_Cgo_ulong"
 	case C.CXType_LongLong:
-		typeName = "C.longlong"
+		typeName = "_Cgo_longlong"
 	case C.CXType_ULongLong:
-		typeName = "C.ulonglong"
+		typeName = "_Cgo_ulonglong"
 	case C.CXType_Bool:
 		typeName = "bool"
 	case C.CXType_Float, C.CXType_Double, C.CXType_LongDouble:
@@ -852,6 +804,14 @@ func (f *cgoFile) makeASTType(typ C.CXType, pos token.Pos) ast.Expr {
 			f.addError(pos, fmt.Sprintf("unknown elaborated type (libclang type kind %s)", typeKindSpelling))
 			typeName = "<unknown>"
 		}
+	case C.CXType_Unexposed:
+		// LLVM 22+ may report certain builtin type aliases (e.g. __size_t)
+		// as Unexposed. Resolve via the canonical type.
+		canonical := C.clang_getCanonicalType(typ)
+		if canonical.kind != C.CXType_Unexposed && canonical.kind != C.CXType_Invalid {
+			return f.makeASTType(canonical, pos)
+		}
+		// If still unexposed, fall through to the error below.
 	case C.CXType_Record:
 		cursor := C.tinygo_clang_getTypeDeclaration(typ)
 		name := getString(C.tinygo_clang_getCursorSpelling(cursor))
@@ -896,7 +856,7 @@ func (f *cgoFile) makeASTType(typ C.CXType, pos token.Pos) ast.Expr {
 		typeSpelling := getString(C.clang_getTypeSpelling(typ))
 		typeKindSpelling := getString(C.clang_getTypeKindSpelling(typ.kind))
 		f.addError(pos, fmt.Sprintf("unknown C type: %v (libclang type kind %s)", typeSpelling, typeKindSpelling))
-		typeName = "C.<unknown>"
+		typeName = "_Cgo_<unknown>"
 	}
 	return &ast.Ident{
 		NamePos: pos,
@@ -913,7 +873,7 @@ func (p *cgoPackage) getIntegerType(name string, cursor clangCursor) *ast.TypeSp
 	var goName string
 	typeSize := C.clang_Type_getSizeOf(underlyingType)
 	switch name {
-	case "C.char":
+	case "_Cgo_char":
 		if typeSize != 1 {
 			// This happens for some very special purpose architectures
 			// (DSPs etc.) that are not currently targeted.
@@ -926,7 +886,7 @@ func (p *cgoPackage) getIntegerType(name string, cursor clangCursor) *ast.TypeSp
 		case C.CXType_Char_U:
 			goName = "uint8"
 		}
-	case "C.schar", "C.short", "C.int", "C.long", "C.longlong":
+	case "_Cgo_schar", "_Cgo_short", "_Cgo_int", "_Cgo_long", "_Cgo_longlong":
 		switch typeSize {
 		case 1:
 			goName = "int8"
@@ -937,7 +897,7 @@ func (p *cgoPackage) getIntegerType(name string, cursor clangCursor) *ast.TypeSp
 		case 8:
 			goName = "int64"
 		}
-	case "C.uchar", "C.ushort", "C.uint", "C.ulong", "C.ulonglong":
+	case "_Cgo_uchar", "_Cgo_ushort", "_Cgo_uint", "_Cgo_ulong", "_Cgo_ulonglong":
 		switch typeSize {
 		case 1:
 			goName = "uint8"
@@ -956,22 +916,16 @@ func (p *cgoPackage) getIntegerType(name string, cursor clangCursor) *ast.TypeSp
 	}

 	// Construct an *ast.TypeSpec for this type.
-	obj := &ast.Object{
-		Kind: ast.Typ,
-		Name: name,
-	}
 	spec := &ast.TypeSpec{
 		Name: &ast.Ident{
 			NamePos: pos,
 			Name:    name,
-			Obj:     obj,
 		},
 		Type: &ast.Ident{
 			NamePos: pos,
 			Name:    goName,
 		},
 	}
-	obj.Decl = spec
 	return spec
 }

@@ -1104,7 +1058,6 @@ func tinygo_clang_struct_visitor(c, parent C.GoCXCursor, client_data C.CXClientD
 				pos:      prevField.Names[0].NamePos,
 			})
 			prevField.Names[0].Name = bitfieldName
-			prevField.Names[0].Obj.Name = bitfieldName
 		}
 		prevBitfield := &(*bitfieldList)[len(*bitfieldList)-1]
 		prevBitfield.endBit = bitfieldOffset
@@ -1121,11 +1074,6 @@ func tinygo_clang_struct_visitor(c, parent C.GoCXCursor, client_data C.CXClientD
 		{
 			NamePos: pos,
 			Name:    name,
-			Obj: &ast.Object{
-				Kind: ast.Var,
-				Name: name,
-				Decl: field,
-			},
 		},
 	}
 	fieldList.List = append(fieldList.List, field)
@@ -1,9 +1,9 @@
-//go:build !byollvm && !llvm15 && !llvm16 && !llvm17 && !llvm18
+//go:build !byollvm && llvm19

 package cgo

 /*
-#cgo linux        CFLAGS:  -I/usr/include/llvm-19 -I/usr/include/llvm-c-19 -I/usr/lib/llvm-19/include
+#cgo linux        CFLAGS:  -I/usr/include/llvm-19 -I/usr/include/llvm-c-19 -I/usr/lib/llvm-19/include -I/usr/lib64/llvm19/include
 #cgo darwin,amd64 CFLAGS:  -I/usr/local/opt/llvm@19/include
 #cgo darwin,arm64 CFLAGS:  -I/opt/homebrew/opt/llvm@19/include
 #cgo freebsd      CFLAGS:  -I/usr/local/llvm19/include
@@ -0,0 +1,15 @@
+//go:build !byollvm && !llvm15 && !llvm16 && !llvm17 && !llvm18 && !llvm19 && !llvm21 && !llvm22
+
+package cgo
+
+/*
+#cgo linux        CFLAGS:  -I/usr/include/llvm-20 -I/usr/include/llvm-c-20 -I/usr/lib/llvm-20/include -I/usr/lib64/llvm20/include
+#cgo darwin,amd64 CFLAGS:  -I/usr/local/opt/llvm@20/include
+#cgo darwin,arm64 CFLAGS:  -I/opt/homebrew/opt/llvm@20/include
+#cgo freebsd      CFLAGS:  -I/usr/local/llvm20/include
+#cgo linux        LDFLAGS: -L/usr/lib/llvm-20/lib -lclang
+#cgo darwin,amd64 LDFLAGS: -L/usr/local/opt/llvm@20/lib -lclang
+#cgo darwin,arm64 LDFLAGS: -L/opt/homebrew/opt/llvm@20/lib -lclang
+#cgo freebsd      LDFLAGS: -L/usr/local/llvm20/lib -lclang
+*/
+import "C"
@@ -0,0 +1,15 @@
+//go:build !byollvm && llvm21
+
+package cgo
+
+/*
+#cgo linux        CFLAGS:  -I/usr/include/llvm-21 -I/usr/include/llvm-c-21 -I/usr/lib/llvm-21/include -I/usr/lib64/llvm21/include
+#cgo darwin,amd64 CFLAGS:  -I/usr/local/opt/llvm@21/include
+#cgo darwin,arm64 CFLAGS:  -I/opt/homebrew/opt/llvm@21/include
+#cgo freebsd      CFLAGS:  -I/usr/local/llvm21/include
+#cgo linux        LDFLAGS: -L/usr/lib/llvm-21/lib -lclang
+#cgo darwin,amd64 LDFLAGS: -L/usr/local/opt/llvm@21/lib -lclang
+#cgo darwin,arm64 LDFLAGS: -L/opt/homebrew/opt/llvm@21/lib -lclang
+#cgo freebsd      LDFLAGS: -L/usr/local/llvm21/lib -lclang
+*/
+import "C"
@@ -0,0 +1,15 @@
+//go:build !byollvm && llvm22
+
+package cgo
+
+/*
+#cgo linux        CFLAGS:  -I/usr/include/llvm-22 -I/usr/include/llvm-c-22 -I/usr/lib/llvm-22/include -I/usr/lib64/llvm22/include
+#cgo darwin,amd64 CFLAGS:  -I/usr/local/opt/llvm@22/include
+#cgo darwin,arm64 CFLAGS:  -I/opt/homebrew/opt/llvm@22/include
+#cgo freebsd      CFLAGS:  -I/usr/local/llvm22/include
+#cgo linux        LDFLAGS: -L/usr/lib/llvm-22/lib -lclang
+#cgo darwin,amd64 LDFLAGS: -L/usr/local/opt/llvm@22/lib -lclang
+#cgo darwin,arm64 LDFLAGS: -L/opt/homebrew/opt/llvm@22/lib -lclang
+#cgo freebsd      LDFLAGS: -L/usr/local/llvm22/lib -lclang
+*/
+import "C"
@@ -78,6 +78,7 @@ var validCompilerFlags = []*regexp.Regexp{
 	re(`-f(no-)?(pic|PIC|pie|PIE)`),
 	re(`-f(no-)?plt`),
 	re(`-f(no-)?rtti`),
+	re(`-f(no-)?short-enums`),
 	re(`-f(no-)?split-stack`),
 	re(`-f(no-)?stack-(.+)`),
 	re(`-f(no-)?strict-aliasing`),
@@ -12,17 +12,17 @@ import "C"
 // C. It is useful if an API uses function pointers and you cannot pass a Go
 // pointer but only a C pointer.
 type refMap struct {
-	refs map[unsafe.Pointer]interface{}
+	refs map[unsafe.Pointer]any
 	lock sync.Mutex
 }

 // Put stores a value in the map. It can later be retrieved using Get. It must
 // be removed using Remove to avoid memory leaks.
-func (m *refMap) Put(v interface{}) unsafe.Pointer {
+func (m *refMap) Put(v any) unsafe.Pointer {
 	m.lock.Lock()
 	defer m.lock.Unlock()
 	if m.refs == nil {
-		m.refs = make(map[unsafe.Pointer]interface{}, 1)
+		m.refs = make(map[unsafe.Pointer]any, 1)
 	}
 	ref := C.malloc(1)
 	m.refs[ref] = v
@@ -31,7 +31,7 @@ func (m *refMap) Put(v interface{}) unsafe.Pointer {

 // Get returns a stored value previously inserted with Put. Use the same
 // reference as you got from Put.
-func (m *refMap) Get(ref unsafe.Pointer) interface{} {
+func (m *refMap) Get(ref unsafe.Pointer) any {
 	m.lock.Lock()
 	defer m.lock.Unlock()
 	return m.refs[ref]
@@ -5,50 +5,50 @@ import "unsafe"

 var _ unsafe.Pointer

-//go:linkname C.CString runtime.cgo_CString
-func C.CString(string) *C.char
+//go:linkname _Cgo_CString runtime.cgo_CString
+func _Cgo_CString(string) *_Cgo_char

-//go:linkname C.GoString runtime.cgo_GoString
-func C.GoString(*C.char) string
+//go:linkname _Cgo_GoString runtime.cgo_GoString
+func _Cgo_GoString(*_Cgo_char) string

-//go:linkname C.__GoStringN runtime.cgo_GoStringN
-func C.__GoStringN(*C.char, uintptr) string
+//go:linkname _Cgo___GoStringN runtime.cgo_GoStringN
+func _Cgo___GoStringN(*_Cgo_char, uintptr) string

-func C.GoStringN(cstr *C.char, length C.int) string {
-	return C.__GoStringN(cstr, uintptr(length))
+func _Cgo_GoStringN(cstr *_Cgo_char, length _Cgo_int) string {
+	return _Cgo___GoStringN(cstr, uintptr(length))
 }

-//go:linkname C.__GoBytes runtime.cgo_GoBytes
-func C.__GoBytes(unsafe.Pointer, uintptr) []byte
+//go:linkname _Cgo___GoBytes runtime.cgo_GoBytes
+func _Cgo___GoBytes(unsafe.Pointer, uintptr) []byte

-func C.GoBytes(ptr unsafe.Pointer, length C.int) []byte {
-	return C.__GoBytes(ptr, uintptr(length))
+func _Cgo_GoBytes(ptr unsafe.Pointer, length _Cgo_int) []byte {
+	return _Cgo___GoBytes(ptr, uintptr(length))
 }

-//go:linkname C.__CBytes runtime.cgo_CBytes
-func C.__CBytes([]byte) unsafe.Pointer
+//go:linkname _Cgo___CBytes runtime.cgo_CBytes
+func _Cgo___CBytes([]byte) unsafe.Pointer

-func C.CBytes(b []byte) unsafe.Pointer {
-	return C.__CBytes(b)
+func _Cgo_CBytes(b []byte) unsafe.Pointer {
+	return _Cgo___CBytes(b)
 }

-//go:linkname C.__get_errno_num runtime.cgo_errno
-func C.__get_errno_num() uintptr
+//go:linkname _Cgo___get_errno_num runtime.cgo_errno
+func _Cgo___get_errno_num() uintptr

-func C.__get_errno() error {
-	return syscall.Errno(C.__get_errno_num())
+func _Cgo___get_errno() error {
+	return syscall.Errno(_Cgo___get_errno_num())
 }

 type (
-	C.char      uint8
-	C.schar     int8
-	C.uchar     uint8
-	C.short     int16
-	C.ushort    uint16
-	C.int       int32
-	C.uint      uint32
-	C.long      int32
-	C.ulong     uint32
-	C.longlong  int64
-	C.ulonglong uint64
+	_Cgo_char      uint8
+	_Cgo_schar     int8
+	_Cgo_uchar     uint8
+	_Cgo_short     int16
+	_Cgo_ushort    uint16
+	_Cgo_int       int32
+	_Cgo_uint      uint32
+	_Cgo_long      int32
+	_Cgo_ulong     uint32
+	_Cgo_longlong  int64
+	_Cgo_ulonglong uint64
 )
@@ -5,58 +5,58 @@ import "unsafe"

 var _ unsafe.Pointer

-//go:linkname C.CString runtime.cgo_CString
-func C.CString(string) *C.char
+//go:linkname _Cgo_CString runtime.cgo_CString
+func _Cgo_CString(string) *_Cgo_char

-//go:linkname C.GoString runtime.cgo_GoString
-func C.GoString(*C.char) string
+//go:linkname _Cgo_GoString runtime.cgo_GoString
+func _Cgo_GoString(*_Cgo_char) string

-//go:linkname C.__GoStringN runtime.cgo_GoStringN
-func C.__GoStringN(*C.char, uintptr) string
+//go:linkname _Cgo___GoStringN runtime.cgo_GoStringN
+func _Cgo___GoStringN(*_Cgo_char, uintptr) string

-func C.GoStringN(cstr *C.char, length C.int) string {
-	return C.__GoStringN(cstr, uintptr(length))
+func _Cgo_GoStringN(cstr *_Cgo_char, length _Cgo_int) string {
+	return _Cgo___GoStringN(cstr, uintptr(length))
 }

-//go:linkname C.__GoBytes runtime.cgo_GoBytes
-func C.__GoBytes(unsafe.Pointer, uintptr) []byte
+//go:linkname _Cgo___GoBytes runtime.cgo_GoBytes
+func _Cgo___GoBytes(unsafe.Pointer, uintptr) []byte

-func C.GoBytes(ptr unsafe.Pointer, length C.int) []byte {
-	return C.__GoBytes(ptr, uintptr(length))
+func _Cgo_GoBytes(ptr unsafe.Pointer, length _Cgo_int) []byte {
+	return _Cgo___GoBytes(ptr, uintptr(length))
 }

-//go:linkname C.__CBytes runtime.cgo_CBytes
-func C.__CBytes([]byte) unsafe.Pointer
+//go:linkname _Cgo___CBytes runtime.cgo_CBytes
+func _Cgo___CBytes([]byte) unsafe.Pointer

-func C.CBytes(b []byte) unsafe.Pointer {
-	return C.__CBytes(b)
+func _Cgo_CBytes(b []byte) unsafe.Pointer {
+	return _Cgo___CBytes(b)
 }

-//go:linkname C.__get_errno_num runtime.cgo_errno
-func C.__get_errno_num() uintptr
+//go:linkname _Cgo___get_errno_num runtime.cgo_errno
+func _Cgo___get_errno_num() uintptr

-func C.__get_errno() error {
-	return syscall.Errno(C.__get_errno_num())
+func _Cgo___get_errno() error {
+	return syscall.Errno(_Cgo___get_errno_num())
 }

 type (
-	C.char      uint8
-	C.schar     int8
-	C.uchar     uint8
-	C.short     int16
-	C.ushort    uint16
-	C.int       int32
-	C.uint      uint32
-	C.long      int32
-	C.ulong     uint32
-	C.longlong  int64
-	C.ulonglong uint64
+	_Cgo_char      uint8
+	_Cgo_schar     int8
+	_Cgo_uchar     uint8
+	_Cgo_short     int16
+	_Cgo_ushort    uint16
+	_Cgo_int       int32
+	_Cgo_uint      uint32
+	_Cgo_long      int32
+	_Cgo_ulong     uint32
+	_Cgo_longlong  int64
+	_Cgo_ulonglong uint64
 )

-const C.foo = 3
-const C.bar = C.foo
-const C.unreferenced = 4
-const C.referenced = C.unreferenced
-const C.fnlike_val = 5
-const C.square_val = (20 * 20)
-const C.add_val = (3 + 5)
+const _Cgo_foo = 3
+const _Cgo_bar = _Cgo_foo
+const _Cgo_unreferenced = 4
+const _Cgo_referenced = _Cgo_unreferenced
+const _Cgo_fnlike_val = 5
+const _Cgo_square_val = (20 * 20)
+const _Cgo_add_val = (3 + 5)
@@ -14,16 +14,16 @@
 //     testdata/errors.go:3:1: function "unusedFunction" in #cgo noescape line is not used

 // Type checking errors after CGo processing:
-//     testdata/errors.go:102: cannot use 2 << 10 (untyped int constant 2048) as C.char value in variable declaration (overflows)
+//     testdata/errors.go:102: cannot use 2 << 10 (untyped int constant 2048) as _Cgo_char value in variable declaration (overflows)
 //     testdata/errors.go:105: unknown field z in struct literal
-//     testdata/errors.go:108: undefined: C.SOME_CONST_1
-//     testdata/errors.go:110: cannot use C.SOME_CONST_3 (untyped int constant 1234) as byte value in variable declaration (overflows)
-//     testdata/errors.go:112: undefined: C.SOME_CONST_4
-//     testdata/errors.go:114: undefined: C.SOME_CONST_b
-//     testdata/errors.go:116: undefined: C.SOME_CONST_startspace
-//     testdata/errors.go:119: undefined: C.SOME_PARAM_CONST_invalid
-//     testdata/errors.go:122: undefined: C.add_toomuch
-//     testdata/errors.go:123: undefined: C.add_toolittle
+//     testdata/errors.go:108: undefined: _Cgo_SOME_CONST_1
+//     testdata/errors.go:110: cannot use _Cgo_SOME_CONST_3 (untyped int constant 1234) as byte value in variable declaration (overflows)
+//     testdata/errors.go:112: undefined: _Cgo_SOME_CONST_4
+//     testdata/errors.go:114: undefined: _Cgo_SOME_CONST_b
+//     testdata/errors.go:116: undefined: _Cgo_SOME_CONST_startspace
+//     testdata/errors.go:119: undefined: _Cgo_SOME_PARAM_CONST_invalid
+//     testdata/errors.go:122: undefined: _Cgo_add_toomuch
+//     testdata/errors.go:123: undefined: _Cgo_add_toolittle

 package main

@@ -32,58 +32,58 @@ import "unsafe"

 var _ unsafe.Pointer

-//go:linkname C.CString runtime.cgo_CString
-func C.CString(string) *C.char
+//go:linkname _Cgo_CString runtime.cgo_CString
+func _Cgo_CString(string) *_Cgo_char

-//go:linkname C.GoString runtime.cgo_GoString
-func C.GoString(*C.char) string
+//go:linkname _Cgo_GoString runtime.cgo_GoString
+func _Cgo_GoString(*_Cgo_char) string

-//go:linkname C.__GoStringN runtime.cgo_GoStringN
-func C.__GoStringN(*C.char, uintptr) string
+//go:linkname _Cgo___GoStringN runtime.cgo_GoStringN
+func _Cgo___GoStringN(*_Cgo_char, uintptr) string

-func C.GoStringN(cstr *C.char, length C.int) string {
-	return C.__GoStringN(cstr, uintptr(length))
+func _Cgo_GoStringN(cstr *_Cgo_char, length _Cgo_int) string {
+	return _Cgo___GoStringN(cstr, uintptr(length))
 }

-//go:linkname C.__GoBytes runtime.cgo_GoBytes
-func C.__GoBytes(unsafe.Pointer, uintptr) []byte
+//go:linkname _Cgo___GoBytes runtime.cgo_GoBytes
+func _Cgo___GoBytes(unsafe.Pointer, uintptr) []byte

-func C.GoBytes(ptr unsafe.Pointer, length C.int) []byte {
-	return C.__GoBytes(ptr, uintptr(length))
+func _Cgo_GoBytes(ptr unsafe.Pointer, length _Cgo_int) []byte {
+	return _Cgo___GoBytes(ptr, uintptr(length))
 }

-//go:linkname C.__CBytes runtime.cgo_CBytes
-func C.__CBytes([]byte) unsafe.Pointer
+//go:linkname _Cgo___CBytes runtime.cgo_CBytes
+func _Cgo___CBytes([]byte) unsafe.Pointer

-func C.CBytes(b []byte) unsafe.Pointer {
-	return C.__CBytes(b)
+func _Cgo_CBytes(b []byte) unsafe.Pointer {
+	return _Cgo___CBytes(b)
 }

-//go:linkname C.__get_errno_num runtime.cgo_errno
-func C.__get_errno_num() uintptr
+//go:linkname _Cgo___get_errno_num runtime.cgo_errno
+func _Cgo___get_errno_num() uintptr

-func C.__get_errno() error {
-	return syscall.Errno(C.__get_errno_num())
+func _Cgo___get_errno() error {
+	return syscall.Errno(_Cgo___get_errno_num())
 }

 type (
-	C.char      uint8
-	C.schar     int8
-	C.uchar     uint8
-	C.short     int16
-	C.ushort    uint16
-	C.int       int32
-	C.uint      uint32
-	C.long      int32
-	C.ulong     uint32
-	C.longlong  int64
-	C.ulonglong uint64
+	_Cgo_char      uint8
+	_Cgo_schar     int8
+	_Cgo_uchar     uint8
+	_Cgo_short     int16
+	_Cgo_ushort    uint16
+	_Cgo_int       int32
+	_Cgo_uint      uint32
+	_Cgo_long      int32
+	_Cgo_ulong     uint32
+	_Cgo_longlong  int64
+	_Cgo_ulonglong uint64
 )
-type C.struct_point_t struct {
-	x C.int
-	y C.int
+type _Cgo_struct_point_t struct {
+	x _Cgo_int
+	y _Cgo_int
 }
-type C.point_t = C.struct_point_t
+type _Cgo_point_t = _Cgo_struct_point_t

-const C.SOME_CONST_3 = 1234
-const C.SOME_PARAM_CONST_valid = 3 + 4
+const _Cgo_SOME_CONST_3 = 1234
+const _Cgo_SOME_PARAM_CONST_valid = 3 + 4
@@ -10,53 +10,53 @@ import "unsafe"

 var _ unsafe.Pointer

-//go:linkname C.CString runtime.cgo_CString
-func C.CString(string) *C.char
+//go:linkname _Cgo_CString runtime.cgo_CString
+func _Cgo_CString(string) *_Cgo_char

-//go:linkname C.GoString runtime.cgo_GoString
-func C.GoString(*C.char) string
+//go:linkname _Cgo_GoString runtime.cgo_GoString
+func _Cgo_GoString(*_Cgo_char) string

-//go:linkname C.__GoStringN runtime.cgo_GoStringN
-func C.__GoStringN(*C.char, uintptr) string
+//go:linkname _Cgo___GoStringN runtime.cgo_GoStringN
+func _Cgo___GoStringN(*_Cgo_char, uintptr) string

-func C.GoStringN(cstr *C.char, length C.int) string {
-	return C.__GoStringN(cstr, uintptr(length))
+func _Cgo_GoStringN(cstr *_Cgo_char, length _Cgo_int) string {
+	return _Cgo___GoStringN(cstr, uintptr(length))
 }

-//go:linkname C.__GoBytes runtime.cgo_GoBytes
-func C.__GoBytes(unsafe.Pointer, uintptr) []byte
+//go:linkname _Cgo___GoBytes runtime.cgo_GoBytes
+func _Cgo___GoBytes(unsafe.Pointer, uintptr) []byte

-func C.GoBytes(ptr unsafe.Pointer, length C.int) []byte {
-	return C.__GoBytes(ptr, uintptr(length))
+func _Cgo_GoBytes(ptr unsafe.Pointer, length _Cgo_int) []byte {
+	return _Cgo___GoBytes(ptr, uintptr(length))
 }

-//go:linkname C.__CBytes runtime.cgo_CBytes
-func C.__CBytes([]byte) unsafe.Pointer
+//go:linkname _Cgo___CBytes runtime.cgo_CBytes
+func _Cgo___CBytes([]byte) unsafe.Pointer

-func C.CBytes(b []byte) unsafe.Pointer {
-	return C.__CBytes(b)
+func _Cgo_CBytes(b []byte) unsafe.Pointer {
+	return _Cgo___CBytes(b)
 }

-//go:linkname C.__get_errno_num runtime.cgo_errno
-func C.__get_errno_num() uintptr
+//go:linkname _Cgo___get_errno_num runtime.cgo_errno
+func _Cgo___get_errno_num() uintptr

-func C.__get_errno() error {
-	return syscall.Errno(C.__get_errno_num())
+func _Cgo___get_errno() error {
+	return syscall.Errno(_Cgo___get_errno_num())
 }

 type (
-	C.char      uint8
-	C.schar     int8
-	C.uchar     uint8
-	C.short     int16
-	C.ushort    uint16
-	C.int       int32
-	C.uint      uint32
-	C.long      int32
-	C.ulong     uint32
-	C.longlong  int64
-	C.ulonglong uint64
+	_Cgo_char      uint8
+	_Cgo_schar     int8
+	_Cgo_uchar     uint8
+	_Cgo_short     int16
+	_Cgo_ushort    uint16
+	_Cgo_int       int32
+	_Cgo_uint      uint32
+	_Cgo_long      int32
+	_Cgo_ulong     uint32
+	_Cgo_longlong  int64
+	_Cgo_ulonglong uint64
 )

-const C.BAR = 3
-const C.FOO_H = 1
+const _Cgo_BAR = 3
+const _Cgo_FOO_H = 1
@@ -5,80 +5,80 @@ import "unsafe"

 var _ unsafe.Pointer

-//go:linkname C.CString runtime.cgo_CString
-func C.CString(string) *C.char
+//go:linkname _Cgo_CString runtime.cgo_CString
+func _Cgo_CString(string) *_Cgo_char

-//go:linkname C.GoString runtime.cgo_GoString
-func C.GoString(*C.char) string
+//go:linkname _Cgo_GoString runtime.cgo_GoString
+func _Cgo_GoString(*_Cgo_char) string

-//go:linkname C.__GoStringN runtime.cgo_GoStringN
-func C.__GoStringN(*C.char, uintptr) string
+//go:linkname _Cgo___GoStringN runtime.cgo_GoStringN
+func _Cgo___GoStringN(*_Cgo_char, uintptr) string

-func C.GoStringN(cstr *C.char, length C.int) string {
-	return C.__GoStringN(cstr, uintptr(length))
+func _Cgo_GoStringN(cstr *_Cgo_char, length _Cgo_int) string {
+	return _Cgo___GoStringN(cstr, uintptr(length))
 }

-//go:linkname C.__GoBytes runtime.cgo_GoBytes
-func C.__GoBytes(unsafe.Pointer, uintptr) []byte
+//go:linkname _Cgo___GoBytes runtime.cgo_GoBytes
+func _Cgo___GoBytes(unsafe.Pointer, uintptr) []byte

-func C.GoBytes(ptr unsafe.Pointer, length C.int) []byte {
-	return C.__GoBytes(ptr, uintptr(length))
+func _Cgo_GoBytes(ptr unsafe.Pointer, length _Cgo_int) []byte {
+	return _Cgo___GoBytes(ptr, uintptr(length))
 }

-//go:linkname C.__CBytes runtime.cgo_CBytes
-func C.__CBytes([]byte) unsafe.Pointer
+//go:linkname _Cgo___CBytes runtime.cgo_CBytes
+func _Cgo___CBytes([]byte) unsafe.Pointer

-func C.CBytes(b []byte) unsafe.Pointer {
-	return C.__CBytes(b)
+func _Cgo_CBytes(b []byte) unsafe.Pointer {
+	return _Cgo___CBytes(b)
 }

-//go:linkname C.__get_errno_num runtime.cgo_errno
-func C.__get_errno_num() uintptr
+//go:linkname _Cgo___get_errno_num runtime.cgo_errno
+func _Cgo___get_errno_num() uintptr

-func C.__get_errno() error {
-	return syscall.Errno(C.__get_errno_num())
+func _Cgo___get_errno() error {
+	return syscall.Errno(_Cgo___get_errno_num())
 }

 type (
-	C.char      uint8
-	C.schar     int8
-	C.uchar     uint8
-	C.short     int16
-	C.ushort    uint16
-	C.int       int32
-	C.uint      uint32
-	C.long      int32
-	C.ulong     uint32
-	C.longlong  int64
-	C.ulonglong uint64
+	_Cgo_char      uint8
+	_Cgo_schar     int8
+	_Cgo_uchar     uint8
+	_Cgo_short     int16
+	_Cgo_ushort    uint16
+	_Cgo_int       int32
+	_Cgo_uint      uint32
+	_Cgo_long      int32
+	_Cgo_ulong     uint32
+	_Cgo_longlong  int64
+	_Cgo_ulonglong uint64
 )

 //export foo
-func C.foo(a C.int, b C.int) C.int
+func _Cgo_foo(a _Cgo_int, b _Cgo_int) _Cgo_int

-var C.foo$funcaddr unsafe.Pointer
+var _Cgo_foo$funcaddr unsafe.Pointer

 //export variadic0
 //go:variadic
-func C.variadic0()
+func _Cgo_variadic0()

-var C.variadic0$funcaddr unsafe.Pointer
+var _Cgo_variadic0$funcaddr unsafe.Pointer

 //export variadic2
 //go:variadic
-func C.variadic2(x C.int, y C.int)
+func _Cgo_variadic2(x _Cgo_int, y _Cgo_int)

-var C.variadic2$funcaddr unsafe.Pointer
+var _Cgo_variadic2$funcaddr unsafe.Pointer

 //export _Cgo_static_173c95a79b6df1980521_staticfunc
-func C.staticfunc!symbols.go(x C.int)
+func _Cgo_staticfunc!symbols.go(x _Cgo_int)

-var C.staticfunc!symbols.go$funcaddr unsafe.Pointer
+var _Cgo_staticfunc!symbols.go$funcaddr unsafe.Pointer

 //export notEscapingFunction
 //go:noescape
-func C.notEscapingFunction(a *C.int)
+func _Cgo_notEscapingFunction(a *_Cgo_int)

-var C.notEscapingFunction$funcaddr unsafe.Pointer
+var _Cgo_notEscapingFunction$funcaddr unsafe.Pointer
 //go:extern someValue
-var C.someValue C.int
+var _Cgo_someValue _Cgo_int
@@ -5,158 +5,162 @@ import "unsafe"

 var _ unsafe.Pointer

-//go:linkname C.CString runtime.cgo_CString
-func C.CString(string) *C.char
+//go:linkname _Cgo_CString runtime.cgo_CString
+func _Cgo_CString(string) *_Cgo_char

-//go:linkname C.GoString runtime.cgo_GoString
-func C.GoString(*C.char) string
+//go:linkname _Cgo_GoString runtime.cgo_GoString
+func _Cgo_GoString(*_Cgo_char) string

-//go:linkname C.__GoStringN runtime.cgo_GoStringN
-func C.__GoStringN(*C.char, uintptr) string
+//go:linkname _Cgo___GoStringN runtime.cgo_GoStringN
+func _Cgo___GoStringN(*_Cgo_char, uintptr) string

-func C.GoStringN(cstr *C.char, length C.int) string {
-	return C.__GoStringN(cstr, uintptr(length))
+func _Cgo_GoStringN(cstr *_Cgo_char, length _Cgo_int) string {
+	return _Cgo___GoStringN(cstr, uintptr(length))
 }

-//go:linkname C.__GoBytes runtime.cgo_GoBytes
-func C.__GoBytes(unsafe.Pointer, uintptr) []byte
+//go:linkname _Cgo___GoBytes runtime.cgo_GoBytes
+func _Cgo___GoBytes(unsafe.Pointer, uintptr) []byte

-func C.GoBytes(ptr unsafe.Pointer, length C.int) []byte {
-	return C.__GoBytes(ptr, uintptr(length))
+func _Cgo_GoBytes(ptr unsafe.Pointer, length _Cgo_int) []byte {
+	return _Cgo___GoBytes(ptr, uintptr(length))
 }

-//go:linkname C.__CBytes runtime.cgo_CBytes
-func C.__CBytes([]byte) unsafe.Pointer
+//go:linkname _Cgo___CBytes runtime.cgo_CBytes
+func _Cgo___CBytes([]byte) unsafe.Pointer

-func C.CBytes(b []byte) unsafe.Pointer {
-	return C.__CBytes(b)
+func _Cgo_CBytes(b []byte) unsafe.Pointer {
+	return _Cgo___CBytes(b)
 }

-//go:linkname C.__get_errno_num runtime.cgo_errno
-func C.__get_errno_num() uintptr
+//go:linkname _Cgo___get_errno_num runtime.cgo_errno
+func _Cgo___get_errno_num() uintptr

-func C.__get_errno() error {
-	return syscall.Errno(C.__get_errno_num())
+func _Cgo___get_errno() error {
+	return syscall.Errno(_Cgo___get_errno_num())
 }

 type (
-	C.char      uint8
-	C.schar     int8
-	C.uchar     uint8
-	C.short     int16
-	C.ushort    uint16
-	C.int       int32
-	C.uint      uint32
-	C.long      int32
-	C.ulong     uint32
-	C.longlong  int64
-	C.ulonglong uint64
+	_Cgo_char      uint8
+	_Cgo_schar     int8
+	_Cgo_uchar     uint8
+	_Cgo_short     int16
+	_Cgo_ushort    uint16
+	_Cgo_int       int32
+	_Cgo_uint      uint32
+	_Cgo_long      int32
+	_Cgo_ulong     uint32
+	_Cgo_longlong  int64
+	_Cgo_ulonglong uint64
 )
-type C.myint = C.int
-type C.struct_point2d_t struct {
-	x C.int
-	y C.int
+type _Cgo_myint = _Cgo_int
+type _Cgo_struct_point2d_t struct {
+	x _Cgo_int
+	y _Cgo_int
 }
-type C.point2d_t = C.struct_point2d_t
-type C.struct_point3d struct {
-	x C.int
-	y C.int
-	z C.int
+type _Cgo_point2d_t = _Cgo_struct_point2d_t
+type _Cgo_struct_point3d struct {
+	x _Cgo_int
+	y _Cgo_int
+	z _Cgo_int
 }
-type C.point3d_t = C.struct_point3d
-type C.struct_type1 struct {
-	_type   C.int
-	__type  C.int
-	___type C.int
+type _Cgo_point3d_t = _Cgo_struct_point3d
+type _Cgo_struct_type1 struct {
+	_type   _Cgo_int
+	__type  _Cgo_int
+	___type _Cgo_int
 }
-type C.struct_type2 struct{ _type C.int }
-type C.union_union1_t struct{ i C.int }
-type C.union1_t = C.union_union1_t
-type C.union_union3_t struct{ $union uint64 }
+type _Cgo_struct_type2 struct{ _type _Cgo_int }
+type _Cgo_union_union1_t struct{ i _Cgo_int }
+type _Cgo_union1_t = _Cgo_union_union1_t
+type _Cgo_union_union3_t struct{ $union uint64 }

-func (union *C.union_union3_t) unionfield_i() *C.int { return (*C.int)(unsafe.Pointer(&union.$union)) }
-func (union *C.union_union3_t) unionfield_d() *float64 {
+func (union *_Cgo_union_union3_t) unionfield_i() *_Cgo_int {
+	return (*_Cgo_int)(unsafe.Pointer(&union.$union))
+}
+func (union *_Cgo_union_union3_t) unionfield_d() *float64 {
 	return (*float64)(unsafe.Pointer(&union.$union))
 }
-func (union *C.union_union3_t) unionfield_s() *C.short {
-	return (*C.short)(unsafe.Pointer(&union.$union))
+func (union *_Cgo_union_union3_t) unionfield_s() *_Cgo_short {
+	return (*_Cgo_short)(unsafe.Pointer(&union.$union))
 }

-type C.union3_t = C.union_union3_t
-type C.union_union2d struct{ $union [2]uint64 }
+type _Cgo_union3_t = _Cgo_union_union3_t
+type _Cgo_union_union2d struct{ $union [2]uint64 }

-func (union *C.union_union2d) unionfield_i() *C.int { return (*C.int)(unsafe.Pointer(&union.$union)) }
-func (union *C.union_union2d) unionfield_d() *[2]float64 {
+func (union *_Cgo_union_union2d) unionfield_i() *_Cgo_int {
+	return (*_Cgo_int)(unsafe.Pointer(&union.$union))
+}
+func (union *_Cgo_union_union2d) unionfield_d() *[2]float64 {
 	return (*[2]float64)(unsafe.Pointer(&union.$union))
 }

-type C.union2d_t = C.union_union2d
-type C.union_unionarray_t struct{ arr [10]C.uchar }
-type C.unionarray_t = C.union_unionarray_t
-type C._Ctype_union___0 struct{ $union [3]uint32 }
+type _Cgo_union2d_t = _Cgo_union_union2d
+type _Cgo_union_unionarray_t struct{ arr [10]_Cgo_uchar }
+type _Cgo_unionarray_t = _Cgo_union_unionarray_t
+type _Cgo__Ctype_union___0 struct{ $union [3]uint32 }

-func (union *C._Ctype_union___0) unionfield_area() *C.point2d_t {
-	return (*C.point2d_t)(unsafe.Pointer(&union.$union))
+func (union *_Cgo__Ctype_union___0) unionfield_area() *_Cgo_point2d_t {
+	return (*_Cgo_point2d_t)(unsafe.Pointer(&union.$union))
 }
-func (union *C._Ctype_union___0) unionfield_solid() *C.point3d_t {
-	return (*C.point3d_t)(unsafe.Pointer(&union.$union))
+func (union *_Cgo__Ctype_union___0) unionfield_solid() *_Cgo_point3d_t {
+	return (*_Cgo_point3d_t)(unsafe.Pointer(&union.$union))
 }

-type C.struct_struct_nested_t struct {
-	begin C.point2d_t
-	end   C.point2d_t
-	tag   C.int
+type _Cgo_struct_struct_nested_t struct {
+	begin _Cgo_point2d_t
+	end   _Cgo_point2d_t
+	tag   _Cgo_int

-	coord C._Ctype_union___0
+	coord _Cgo__Ctype_union___0
 }
-type C.struct_nested_t = C.struct_struct_nested_t
-type C.union_union_nested_t struct{ $union [2]uint64 }
+type _Cgo_struct_nested_t = _Cgo_struct_struct_nested_t
+type _Cgo_union_union_nested_t struct{ $union [2]uint64 }

-func (union *C.union_union_nested_t) unionfield_point() *C.point3d_t {
-	return (*C.point3d_t)(unsafe.Pointer(&union.$union))
+func (union *_Cgo_union_union_nested_t) unionfield_point() *_Cgo_point3d_t {
+	return (*_Cgo_point3d_t)(unsafe.Pointer(&union.$union))
 }
-func (union *C.union_union_nested_t) unionfield_array() *C.unionarray_t {
-	return (*C.unionarray_t)(unsafe.Pointer(&union.$union))
+func (union *_Cgo_union_union_nested_t) unionfield_array() *_Cgo_unionarray_t {
+	return (*_Cgo_unionarray_t)(unsafe.Pointer(&union.$union))
 }
-func (union *C.union_union_nested_t) unionfield_thing() *C.union3_t {
-	return (*C.union3_t)(unsafe.Pointer(&union.$union))
+func (union *_Cgo_union_union_nested_t) unionfield_thing() *_Cgo_union3_t {
+	return (*_Cgo_union3_t)(unsafe.Pointer(&union.$union))
 }

-type C.union_nested_t = C.union_union_nested_t
-type C.enum_option = C.int
-type C.option_t = C.enum_option
-type C.enum_option2_t = C.uint
-type C.option2_t = C.enum_option2_t
-type C.struct_types_t struct {
+type _Cgo_union_nested_t = _Cgo_union_union_nested_t
+type _Cgo_enum_option = _Cgo_int
+type _Cgo_option_t = _Cgo_enum_option
+type _Cgo_enum_option2_t = _Cgo_uint
+type _Cgo_option2_t = _Cgo_enum_option2_t
+type _Cgo_struct_types_t struct {
 	f   float32
 	d   float64
-	ptr *C.int
+	ptr *_Cgo_int
 }
-type C.types_t = C.struct_types_t
-type C.myIntArray = [10]C.int
-type C.struct_bitfield_t struct {
-	start        C.uchar
-	__bitfield_1 C.uchar
+type _Cgo_types_t = _Cgo_struct_types_t
+type _Cgo_myIntArray = [10]_Cgo_int
+type _Cgo_struct_bitfield_t struct {
+	start        _Cgo_uchar
+	__bitfield_1 _Cgo_uchar

-	d C.uchar
-	e C.uchar
+	d _Cgo_uchar
+	e _Cgo_uchar
 }

-func (s *C.struct_bitfield_t) bitfield_a() C.uchar { return s.__bitfield_1 & 0x1f }
-func (s *C.struct_bitfield_t) set_bitfield_a(value C.uchar) {
+func (s *_Cgo_struct_bitfield_t) bitfield_a() _Cgo_uchar { return s.__bitfield_1 & 0x1f }
+func (s *_Cgo_struct_bitfield_t) set_bitfield_a(value _Cgo_uchar) {
 	s.__bitfield_1 = s.__bitfield_1&^0x1f | value&0x1f<<0
 }
-func (s *C.struct_bitfield_t) bitfield_b() C.uchar {
+func (s *_Cgo_struct_bitfield_t) bitfield_b() _Cgo_uchar {
 	return s.__bitfield_1 >> 5 & 0x1
 }
-func (s *C.struct_bitfield_t) set_bitfield_b(value C.uchar) {
+func (s *_Cgo_struct_bitfield_t) set_bitfield_b(value _Cgo_uchar) {
 	s.__bitfield_1 = s.__bitfield_1&^0x20 | value&0x1<<5
 }
-func (s *C.struct_bitfield_t) bitfield_c() C.uchar {
+func (s *_Cgo_struct_bitfield_t) bitfield_c() _Cgo_uchar {
 	return s.__bitfield_1 >> 6
 }
-func (s *C.struct_bitfield_t) set_bitfield_c(value C.uchar,
+func (s *_Cgo_struct_bitfield_t) set_bitfield_c(value _Cgo_uchar,

 ) { s.__bitfield_1 = s.__bitfield_1&0x3f | value<<6 }

-type C.bitfield_t = C.struct_bitfield_t
+type _Cgo_bitfield_t = _Cgo_struct_bitfield_t
@@ -8,12 +8,25 @@ import (
 	"os"
 	"path/filepath"
 	"regexp"
+	"slices"
+	"strconv"
 	"strings"

 	"github.com/google/shlex"
 	"github.com/tinygo-org/tinygo/goenv"
 )

+// Library versions. Whenever an existing library is changed, this number should
+// be added/increased so that existing caches are invalidated.
+//
+// (This is a bit of a layering violation, this should really be part of the
+// builder.Library struct but that's hard to do since we want to know the
+// library path in advance in several places).
+var libVersions = map[string]int{
+	"musl":  3,
+	"bdwgc": 2,
+}
+
 // Config keeps all configuration affecting the build in a single struct.
 type Config struct {
 	Options        *Options
@@ -48,13 +61,15 @@ func (c *Config) BuildMode() string {
 // RISC-V processor, that could be "+a,+c,+m". For many targets, an empty list
 // will be returned.
 func (c *Config) Features() string {
+	var features string
 	if c.Target.Features == "" {
-		return c.Options.LLVMFeatures
+		features = c.Options.LLVMFeatures
+	} else if c.Options.LLVMFeatures == "" {
+		features = c.Target.Features
+	} else {
+		features = c.Target.Features + "," + c.Options.LLVMFeatures
 	}
-	if c.Options.LLVMFeatures == "" {
-		return c.Target.Features
-	}
-	return c.Target.Features + "," + c.Options.LLVMFeatures
+	return patchFeatures(features)
 }

 // ABI returns the -mabi= flag for this target (like -mabi=lp64). A zero-length
@@ -127,14 +142,8 @@ func (c *Config) GC() string {
 // that can be traced by the garbage collector.
 func (c *Config) NeedsStackObjects() bool {
 	switch c.GC() {
-	case "conservative", "custom", "precise":
-		for _, tag := range c.BuildTags() {
-			if tag == "tinygo.wasm" {
-				return true
-			}
-		}
-
-		return false
+	case "conservative", "custom", "precise", "boehm":
+		return slices.Contains(c.BuildTags(), "tinygo.wasm")
 	default:
 		return false
 	}
@@ -214,7 +223,7 @@ func (c *Config) StackSize() uint64 {

 // MaxStackAlloc returns the size of the maximum allocation to put on the stack vs heap.
 func (c *Config) MaxStackAlloc() uint64 {
-	if c.StackSize() > 32*1024 {
+	if c.StackSize() >= 16*1024 {
 		return 1024
 	}

@@ -233,7 +242,7 @@ func (c *Config) RP2040BootPatch() bool {
 // Return a canonicalized architecture name, so we don't have to deal with arm*
 // vs thumb* vs arm64.
 func CanonicalArchName(triple string) string {
-	arch := strings.Split(triple, "-")[0]
+	arch, _, _ := strings.Cut(triple, "-")
 	if arch == "arm64" {
 		return "aarch64"
 	}
@@ -252,10 +261,18 @@ func MuslArchitecture(triple string) string {
 	return CanonicalArchName(triple)
 }

-// LibcPath returns the path to the libc directory. The libc path will be either
-// a precompiled libc shipped with a TinyGo build, or a libc path in the cache
-// directory (which might not yet be built).
-func (c *Config) LibcPath(name string) (path string, precompiled bool) {
+// Returns true if the libc needs to include malloc, for the libcs where this
+// matters.
+func (c *Config) LibcNeedsMalloc() bool {
+	if c.GC() == "boehm" && c.Target.Libc == "wasi-libc" {
+		return true
+	}
+	return false
+}
+
+// LibraryPath returns the path to the library build directory. The path will be
+// a library path in the cache directory (which might not yet be built).
+func (c *Config) LibraryPath(name string) string {
 	archname := c.Triple()
 	if c.CPU() != "" {
 		archname += "-" + c.CPU()
@@ -266,18 +283,24 @@ func (c *Config) LibcPath(name string) (path string, precompiled bool) {
 	if c.Target.SoftFloat {
 		archname += "-softfloat"
 	}
+	if name == "bdwgc" {
+		// Boehm GC is compiled against a particular libc.
+		archname += "-" + c.Target.Libc
+	}

-	// Try to load a precompiled library.
-	precompiledDir := filepath.Join(goenv.Get("TINYGOROOT"), "pkg", archname, name)
-	if _, err := os.Stat(precompiledDir); err == nil {
-		// Found a precompiled library for this OS/architecture. Return the path
-		// directly.
-		return precompiledDir, true
+	// Append a version string, if this library has a version.
+	if v, ok := libVersions[name]; ok {
+		archname += "-v" + strconv.Itoa(v)
+	}
+
+	options := ""
+	if c.LibcNeedsMalloc() {
+		options += "+malloc"
 	}

 	// No precompiled library found. Determine the path name that will be used
 	// in the build cache.
-	return filepath.Join(goenv.Get("GOCACHE"), name+"-"+archname), false
+	return filepath.Join(goenv.Get("GOCACHE"), name+options+"-"+archname)
 }

 // DefaultBinaryExtension returns the default extension for binaries, such as
@@ -320,65 +343,13 @@ func (c *Config) CFlags(libclang bool) []string {
 			"-resource-dir="+resourceDir,
 		)
 	}
-	switch c.Target.Libc {
-	case "darwin-libSystem":
-		root := goenv.Get("TINYGOROOT")
-		cflags = append(cflags,
-			"-nostdlibinc",
-			"-isystem", filepath.Join(root, "lib/macos-minimal-sdk/src/usr/include"),
-		)
-	case "picolibc":
-		root := goenv.Get("TINYGOROOT")
-		picolibcDir := filepath.Join(root, "lib", "picolibc", "newlib", "libc")
-		path, _ := c.LibcPath("picolibc")
-		cflags = append(cflags,
-			"-nostdlibinc",
-			"-isystem", filepath.Join(path, "include"),
-			"-isystem", filepath.Join(picolibcDir, "include"),
-			"-isystem", filepath.Join(picolibcDir, "tinystdio"),
-			"-D__PICOLIBC_ERRNO_FUNCTION=__errno_location",
-		)
-	case "musl":
-		root := goenv.Get("TINYGOROOT")
-		path, _ := c.LibcPath("musl")
-		arch := MuslArchitecture(c.Triple())
-		cflags = append(cflags,
-			"-nostdlibinc",
-			"-isystem", filepath.Join(path, "include"),
-			"-isystem", filepath.Join(root, "lib", "musl", "arch", arch),
-			"-isystem", filepath.Join(root, "lib", "musl", "arch", "generic"),
-			"-isystem", filepath.Join(root, "lib", "musl", "include"),
-		)
-	case "wasi-libc":
-		root := goenv.Get("TINYGOROOT")
-		cflags = append(cflags,
-			"-nostdlibinc",
-			"-isystem", root+"/lib/wasi-libc/sysroot/include")
-	case "wasmbuiltins":
-		// nothing to add (library is purely for builtins)
-	case "mingw-w64":
-		root := goenv.Get("TINYGOROOT")
-		path, _ := c.LibcPath("mingw-w64")
-		cflags = append(cflags,
-			"-nostdlibinc",
-			"-isystem", filepath.Join(path, "include"),
-			"-isystem", filepath.Join(root, "lib", "mingw-w64", "mingw-w64-headers", "crt"),
-			"-isystem", filepath.Join(root, "lib", "mingw-w64", "mingw-w64-headers", "defaults", "include"),
-			"-D_UCRT",
-		)
-	case "":
-		// No libc specified, nothing to add.
-	default:
-		// Incorrect configuration. This could be handled in a better way, but
-		// usually this will be found by developers (not by TinyGo users).
-		panic("unknown libc: " + c.Target.Libc)
-	}
+	cflags = append(cflags, c.LibcCFlags()...)
 	// Always emit debug information. It is optionally stripped at link time.
 	cflags = append(cflags, "-gdwarf-4")
 	// Use the same optimization level as TinyGo.
 	cflags = append(cflags, "-O"+c.Options.Opt)
 	// Set the LLVM target triple.
-	cflags = append(cflags, "--target="+c.Triple())
+	cflags = append(cflags, "--target="+ClangTriple(c.Triple()))
 	// Set the -mcpu (or similar) flag.
 	if c.Target.CPU != "" {
 		if c.GOARCH() == "amd64" || c.GOARCH() == "386" {
@@ -399,6 +370,80 @@ func (c *Config) CFlags(libclang bool) []string {
 	return cflags
 }

+// LibcCFlags returns the C compiler flags for the configured libc.
+// It only uses flags that are part of the libc path (triple, cpu, abi, libc
+// name) so it can safely be used to compile another C library.
+func (c *Config) LibcCFlags() []string {
+	switch c.Target.Libc {
+	case "darwin-libSystem":
+		root := goenv.Get("TINYGOROOT")
+		return []string{
+			"-nostdlibinc",
+			"-isystem", filepath.Join(root, "lib/macos-minimal-sdk/src/usr/include"),
+		}
+	case "picolibc":
+		root := goenv.Get("TINYGOROOT")
+		picolibcDir := filepath.Join(root, "lib", "picolibc", "newlib", "libc")
+		path := c.LibraryPath("picolibc")
+		return []string{
+			"-nostdlibinc",
+			"-isystem", filepath.Join(path, "include"),
+			"-isystem", filepath.Join(picolibcDir, "include"),
+			"-isystem", filepath.Join(picolibcDir, "tinystdio"),
+			"-D__PICOLIBC_ERRNO_FUNCTION=__errno_location",
+		}
+	case "musl":
+		root := goenv.Get("TINYGOROOT")
+		path := c.LibraryPath("musl")
+		arch := MuslArchitecture(c.Triple())
+		return []string{
+			"-nostdlibinc",
+			"-isystem", filepath.Join(path, "include"),
+			"-isystem", filepath.Join(root, "lib", "musl", "arch", arch),
+			"-isystem", filepath.Join(root, "lib", "musl", "arch", "generic"),
+			"-isystem", filepath.Join(root, "lib", "musl", "include"),
+		}
+	case "wasi-libc":
+		path := c.LibraryPath("wasi-libc")
+		return []string{
+			"-nostdlibinc",
+			"-isystem", filepath.Join(path, "include"),
+		}
+	case "wasmbuiltins":
+		// nothing to add (library is purely for builtins)
+		return nil
+	case "mingw-w64":
+		root := goenv.Get("TINYGOROOT")
+		path := c.LibraryPath("mingw-w64")
+		cflags := []string{
+			"-nostdlibinc",
+			"-isystem", filepath.Join(path, "include"),
+			"-isystem", filepath.Join(root, "lib", "mingw-w64", "mingw-w64-headers", "crt"),
+			"-isystem", filepath.Join(root, "lib", "mingw-w64", "mingw-w64-headers", "include"),
+			"-isystem", filepath.Join(root, "lib", "mingw-w64", "mingw-w64-headers", "defaults", "include"),
+		}
+		if c.GOARCH() == "386" {
+			cflags = append(cflags,
+				"-D__MSVCRT_VERSION__=0x700", // Microsoft Visual C++ .NET 2002
+				"-D_WIN32_WINNT=0x0501",      // target Windows XP
+			)
+		} else {
+			cflags = append(cflags,
+				"-D_UCRT",
+				"-D_WIN32_WINNT=0x0a00", // target Windows 10
+			)
+		}
+		return cflags
+	case "":
+		// No libc specified, nothing to add.
+		return nil
+	default:
+		// Incorrect configuration. This could be handled in a better way, but
+		// usually this will be found by developers (not by TinyGo users).
+		panic("unknown libc: " + c.Target.Libc)
+	}
+}
+
 // LDFlags returns the flags to pass to the linker. A few more flags are needed
 // (like the one for the compiler runtime), but this represents the majority of
 // the flags.
@@ -418,6 +463,22 @@ func (c *Config) LDFlags() []string {
 	return ldflags
 }

+// LinkerFlavor returns how the configured linker should be driven.
+// Usually this is derived from GOOS, but targets may override it explicitly.
+func (c *Config) LinkerFlavor() string {
+	if c.Target.LinkerFlavor != "" {
+		return c.Target.LinkerFlavor
+	}
+	switch c.GOOS() {
+	case "windows":
+		return "coff"
+	case "darwin":
+		return "darwin"
+	default:
+		return "gnu"
+	}
+}
+
 // ExtraFiles returns the list of extra files to be built and linked with the
 // executable. This can include extra C and assembly files.
 func (c *Config) ExtraFiles() []string {
@@ -488,10 +549,10 @@ func (c *Config) Programmer() (method, openocdInterface string) {
 	case "":
 		// No configuration supplied.
 		return c.Target.FlashMethod, c.Target.OpenOCDInterface
-	case "openocd", "msd", "command":
+	case "openocd", "msd", "command", "adb":
 		// The -programmer flag only specifies the flash method.
 		return c.Options.Programmer, c.Target.OpenOCDInterface
-	case "bmp":
+	case "bmp", "probe-rs":
 		// The -programmer flag only specifies the flash method.
 		return c.Options.Programmer, ""
 	default:
@@ -0,0 +1,9 @@
+//go:build !llvm22 && !llvm14 && !llvm15 && !llvm16 && !llvm17 && !llvm18 && !llvm19
+
+package compileopts
+
+// patchFeatures applies LLVM-version-specific feature name mappings.
+// For LLVM 20/21, features in the target JSON files are already correct.
+func patchFeatures(features string) string {
+	return features
+}
@@ -0,0 +1,26 @@
+//go:build llvm22
+
+package compileopts
+
+import "strings"
+
+// patchFeatures applies LLVM-version-specific feature name mappings.
+// LLVM 22 renamed several Xtensa target features.
+func patchFeatures(features string) string {
+	// Xtensa feature renames in LLVM 22:
+	//   atomctl → (removed, no direct replacement)
+	//   memctl  → (removed, no direct replacement)
+	//   esp32s3 → esp32s3ops
+	//   timerint → timers3 (for esp32/esp32s3) or timers1 (for esp8266)
+	// Since we can't distinguish which timer variant at this level,
+	// just remove the obsolete features. The CPU definition already
+	// implies the correct features in LLVM 22.
+	replacer := strings.NewReplacer(
+		"+atomctl,", "",
+		"+memctl,", "",
+		"+esp32s3,", "+esp32s3ops,",
+		"+timerint,", "",
+		",+timerint", "",
+	)
+	return replacer.Replace(features)
+}
@@ -0,0 +1,16 @@
+//go:build llvm14 || llvm15 || llvm16 || llvm17 || llvm18 || llvm19
+
+package compileopts
+
+import "strings"
+
+// patchFeatures applies LLVM-version-specific feature name mappings.
+// LLVM 19 and earlier do not have +bulk-memory-opt or
+// +call-indirect-overlong for WebAssembly (added in LLVM 20).
+func patchFeatures(features string) string {
+	features = strings.ReplaceAll(features, ",+bulk-memory-opt", "")
+	features = strings.ReplaceAll(features, "+bulk-memory-opt,", "")
+	features = strings.ReplaceAll(features, ",+call-indirect-overlong", "")
+	features = strings.ReplaceAll(features, "+call-indirect-overlong,", "")
+	return features
+}
@@ -3,13 +3,14 @@ package compileopts
 import (
 	"fmt"
 	"regexp"
+	"slices"
 	"strings"
 	"time"
 )

 var (
-	validBuildModeOptions     = []string{"default", "c-shared"}
-	validGCOptions            = []string{"none", "leaking", "conservative", "custom", "precise"}
+	validBuildModeOptions     = []string{"default", "c-shared", "wasi-legacy"}
+	validGCOptions            = []string{"none", "leaking", "conservative", "custom", "precise", "boehm"}
 	validSchedulerOptions     = []string{"none", "tasks", "asyncify", "threads", "cores"}
 	validSerialOptions        = []string{"none", "uart", "usb", "rtt"}
 	validPrintSizeOptions     = []string{"none", "short", "full", "html"}
@@ -21,50 +22,53 @@ var (
 // usually passed from the command line, but can also be passed in environment
 // variables for example.
 type Options struct {
-	GOOS            string // environment variable
-	GOARCH          string // environment variable
-	GOARM           string // environment variable (only used with GOARCH=arm)
-	GOMIPS          string // environment variable (only used with GOARCH=mips and GOARCH=mipsle)
-	Directory       string // working dir, leave it unset to use the current working dir
-	Target          string
-	BuildMode       string // -buildmode flag
-	Opt             string
-	GC              string
-	PanicStrategy   string
-	Scheduler       string
-	StackSize       uint64 // goroutine stack size (if none could be automatically determined)
-	Serial          string
-	Work            bool // -work flag to print temporary build directory
-	InterpTimeout   time.Duration
-	PrintIR         bool
-	DumpSSA         bool
-	VerifyIR        bool
-	SkipDWARF       bool
-	PrintCommands   func(cmd string, args ...string) `json:"-"`
-	Semaphore       chan struct{}                    `json:"-"` // -p flag controls cap
-	Debug           bool
-	PrintSizes      string
-	PrintAllocs     *regexp.Regexp // regexp string
-	PrintStacks     bool
-	Tags            []string
-	GlobalValues    map[string]map[string]string // map[pkgpath]map[varname]value
-	TestConfig      TestConfig
-	Programmer      string
-	OpenOCDCommands []string
-	LLVMFeatures    string
-	PrintJSON       bool
-	Monitor         bool
-	BaudRate        int
-	Timeout         time.Duration
-	WITPackage      string // pass through to wasm-tools component embed invocation
-	WITWorld        string // pass through to wasm-tools component embed -w option
-	ExtLDFlags      []string
+	GOOS                    string // environment variable
+	GOARCH                  string // environment variable
+	GOARM                   string // environment variable (only used with GOARCH=arm)
+	GOMIPS                  string // environment variable (only used with GOARCH=mips and GOARCH=mipsle)
+	Directory               string // working dir, leave it unset to use the current working dir
+	Target                  string
+	BuildMode               string // -buildmode flag
+	Opt                     string
+	GC                      string
+	PanicStrategy           string
+	Scheduler               string
+	StackSize               uint64 // goroutine stack size (if none could be automatically determined)
+	Serial                  string
+	Work                    bool // -work flag to print temporary build directory
+	InterpTimeout           time.Duration
+	InterpMaxLoopIterations int
+	PrintIR                 bool
+	DumpSSA                 bool
+	VerifyIR                bool
+	SkipDWARF               bool
+	PrintCommands           func(cmd string, args ...string) `json:"-"`
+	Semaphore               chan struct{}                    `json:"-"` // -p flag controls cap
+	Debug                   bool
+	Nobounds                bool
+	PrintSizes              string
+	PrintAllocs             *regexp.Regexp // regexp string
+	PrintAllocsCover        bool           // emit allocs in go coverage tool format
+	PrintStacks             bool
+	Tags                    []string
+	GlobalValues            map[string]map[string]string // map[pkgpath]map[varname]value
+	TestConfig              TestConfig
+	Programmer              string
+	OpenOCDCommands         []string
+	LLVMFeatures            string
+	Monitor                 bool
+	BaudRate                int
+	Timeout                 time.Duration
+	WITPackage              string // pass through to wasm-tools component embed invocation
+	WITWorld                string // pass through to wasm-tools component embed -w option
+	ExtLDFlags              []string
+	GoCompatibility         bool // enable to check for Go version compatibility
 }

 // Verify performs a validation on the given options, raising an error if options are not valid.
 func (o *Options) Verify() error {
 	if o.BuildMode != "" {
-		valid := isInArray(validBuildModeOptions, o.BuildMode)
+		valid := slices.Contains(validBuildModeOptions, o.BuildMode)
 		if !valid {
 			return fmt.Errorf(`invalid buildmode option '%s': valid values are %s`,
 				o.BuildMode,
@@ -72,7 +76,7 @@ func (o *Options) Verify() error {
 		}
 	}
 	if o.GC != "" {
-		valid := isInArray(validGCOptions, o.GC)
+		valid := slices.Contains(validGCOptions, o.GC)
 		if !valid {
 			return fmt.Errorf(`invalid gc option '%s': valid values are %s`,
 				o.GC,
@@ -81,7 +85,7 @@ func (o *Options) Verify() error {
 	}

 	if o.Scheduler != "" {
-		valid := isInArray(validSchedulerOptions, o.Scheduler)
+		valid := slices.Contains(validSchedulerOptions, o.Scheduler)
 		if !valid {
 			return fmt.Errorf(`invalid scheduler option '%s': valid values are %s`,
 				o.Scheduler,
@@ -90,7 +94,7 @@ func (o *Options) Verify() error {
 	}

 	if o.Serial != "" {
-		valid := isInArray(validSerialOptions, o.Serial)
+		valid := slices.Contains(validSerialOptions, o.Serial)
 		if !valid {
 			return fmt.Errorf(`invalid serial option '%s': valid values are %s`,
 				o.Serial,
@@ -99,7 +103,7 @@ func (o *Options) Verify() error {
 	}

 	if o.PrintSizes != "" {
-		valid := isInArray(validPrintSizeOptions, o.PrintSizes)
+		valid := slices.Contains(validPrintSizeOptions, o.PrintSizes)
 		if !valid {
 			return fmt.Errorf(`invalid size option '%s': valid values are %s`,
 				o.PrintSizes,
@@ -108,7 +112,7 @@ func (o *Options) Verify() error {
 	}

 	if o.PanicStrategy != "" {
-		valid := isInArray(validPanicStrategyOptions, o.PanicStrategy)
+		valid := slices.Contains(validPanicStrategyOptions, o.PanicStrategy)
 		if !valid {
 			return fmt.Errorf(`invalid panic option '%s': valid values are %s`,
 				o.PanicStrategy,
@@ -117,19 +121,10 @@ func (o *Options) Verify() error {
 	}

 	if o.Opt != "" {
-		if !isInArray(validOptOptions, o.Opt) {
+		if !slices.Contains(validOptOptions, o.Opt) {
 			return fmt.Errorf("invalid -opt=%s: valid values are %s", o.Opt, strings.Join(validOptOptions, ", "))
 		}
 	}

 	return nil
 }
-
-func isInArray(arr []string, item string) bool {
-	for _, i := range arr {
-		if i == item {
-			return true
-		}
-	}
-	return false
-}
@@ -9,8 +9,8 @@ import (

 func TestVerifyOptions(t *testing.T) {

-	expectedGCError := errors.New(`invalid gc option 'incorrect': valid values are none, leaking, conservative, custom, precise`)
-	expectedSchedulerError := errors.New(`invalid scheduler option 'incorrect': valid values are none, tasks, asyncify, threads`)
+	expectedGCError := errors.New(`invalid gc option 'incorrect': valid values are none, leaking, conservative, custom, precise, boehm`)
+	expectedSchedulerError := errors.New(`invalid scheduler option 'incorrect': valid values are none, tasks, asyncify, threads, cores`)
 	expectedPrintSizeError := errors.New(`invalid size option 'incorrect': valid values are none, short, full, html`)
 	expectedPanicStrategyError := errors.New(`invalid panic option 'incorrect': valid values are print, trap`)

@@ -24,6 +24,7 @@ import (
 // https://github.com/shepmaster/rust-arduino-blink-led-no-core-with-cargo/blob/master/blink/arduino.json
 type TargetSpec struct {
 	Inherits         []string `json:"inherits,omitempty"`
+	InheritableOnly  bool     `json:"inheritable-only"` // this target is only meant to be inherited from, not used directly
 	Triple           string   `json:"llvm-target,omitempty"`
 	CPU              string   `json:"cpu,omitempty"`
 	ABI              string   `json:"target-abi,omitempty"` // roughly equivalent to -mabi= flag
@@ -37,7 +38,8 @@ type TargetSpec struct {
 	Scheduler        string   `json:"scheduler,omitempty"`
 	Serial           string   `json:"serial,omitempty"` // which serial output to use (uart, usb, none)
 	Linker           string   `json:"linker,omitempty"`
-	RTLib            string   `json:"rtlib,omitempty"` // compiler runtime library (libgcc, compiler-rt)
+	LinkerFlavor     string   `json:"linker-flavor,omitempty"` // how to drive the configured linker (for example: gnu, coff, darwin)
+	RTLib            string   `json:"rtlib,omitempty"`         // compiler runtime library (libgcc, compiler-rt)
 	Libc             string   `json:"libc,omitempty"`
 	AutoStackSize    *bool    `json:"automatic-stack-size,omitempty"` // Determine stack size automatically at compile time.
 	DefaultStackSize uint64   `json:"default-stack-size,omitempty"`   // Default stack size if the size couldn't be determined at compile time.
@@ -63,6 +65,10 @@ type TargetSpec struct {
 	OpenOCDCommands  []string `json:"openocd-commands,omitempty"`
 	OpenOCDVerify    *bool    `json:"openocd-verify,omitempty"` // enable verify when flashing with openocd
 	JLinkDevice      string   `json:"jlink-device,omitempty"`
+	ADBPreCommands   []string `json:"adb-pre-commands,omitempty"`
+	ADBPushRemote    string   `json:"adb-push-remote,omitempty"`
+	ADBPostCommands  []string `json:"adb-post-commands,omitempty"`
+	ProbeRSChip      string   `json:"probe-rs-chip,omitempty"`
 	CodeModel        string   `json:"code-model,omitempty"`
 	RelocationModel  string   `json:"relocation-model,omitempty"`
 	WITPackage       string   `json:"wit-package,omitempty"`
@@ -148,6 +154,11 @@ func (spec *TargetSpec) loadFromGivenStr(str string) error {

 // resolveInherits loads inherited targets, recursively.
 func (spec *TargetSpec) resolveInherits() error {
+	// Save InheritableOnly before resolving, since it must not propagate
+	// from parent to child (a board target should not become inheritable-only
+	// just because its parent processor target is).
+	inheritableOnly := spec.InheritableOnly
+
 	// First create a new spec with all the inherited properties.
 	newSpec := &TargetSpec{}
 	for _, name := range spec.Inherits {
@@ -173,11 +184,29 @@ func (spec *TargetSpec) resolveInherits() error {
 	}
 	*spec = *newSpec

+	// Restore InheritableOnly from the original spec, not from parents.
+	spec.InheritableOnly = inheritableOnly
+
 	return nil
 }

 // Load a target specification.
 func LoadTarget(options *Options) (*TargetSpec, error) {
+	if options.Target == "" && options.GOARCH == "wasm" {
+		// Set a specific target if we're building from a known GOOS/GOARCH
+		// combination that is defined in a target JSON file.
+		switch options.GOOS {
+		case "js":
+			options.Target = "wasm"
+		case "wasip1":
+			options.Target = "wasip1"
+		case "wasip2":
+			options.Target = "wasip2"
+		default:
+			return nil, errors.New("GOARCH=wasm but GOOS is not set correctly. Please set GOOS to js, wasip1, or wasip2.")
+		}
+	}
+
 	if options.Target == "" {
 		return defaultTarget(options)
 	}
@@ -224,10 +253,17 @@ func GetTargetSpecs() (map[string]*TargetSpec, error) {
 			continue
 		}
 		path := filepath.Join(dir, entry.Name())
+
 		spec, err := LoadTarget(&Options{Target: path})
 		if err != nil {
 			return nil, fmt.Errorf("could not list target: %w", err)
 		}
+
+		if spec.InheritableOnly {
+			// Skip targets that are only meant to be inherited from, not used directly.
+			continue
+		}
+
 		if spec.FlashMethod == "" && spec.FlashCommand == "" && spec.Emulator == "" {
 			// This doesn't look like a regular target file, but rather like
 			// a parent target (such as targets/cortex-m.json).
@@ -247,7 +283,6 @@ func defaultTarget(options *Options) (*TargetSpec, error) {
 		GOOS:             options.GOOS,
 		GOARCH:           options.GOARCH,
 		BuildTags:        []string{options.GOOS, options.GOARCH},
-		GC:               "precise",
 		Linker:           "cc",
 		DefaultStackSize: 1024 * 64, // 64kB
 		GDB:              []string{"gdb"},
@@ -355,17 +390,7 @@ func defaultTarget(options *Options) (*TargetSpec, error) {
 			return nil, fmt.Errorf("invalid GOMIPS=%s: must be hardfloat or softfloat", options.GOMIPS)
 		}
 	case "wasm":
-		llvmarch = "wasm32"
-		spec.CPU = "generic"
-		spec.Features = "+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types"
-		spec.BuildTags = append(spec.BuildTags, "tinygo.wasm")
-		spec.CFlags = append(spec.CFlags,
-			"-mbulk-memory",
-			"-mnontrapping-fptoint",
-			"-mno-multivalue",
-			"-mno-reference-types",
-			"-msign-ext",
-		)
+		return nil, fmt.Errorf("GOARCH=wasm but GOOS is unset. Please set GOOS to js, wasip1, or wasip2.")
 	default:
 		return nil, fmt.Errorf("unknown GOARCH=%s", options.GOARCH)
 	}
@@ -375,12 +400,13 @@ func defaultTarget(options *Options) (*TargetSpec, error) {
 	llvmvendor := "unknown"
 	switch options.GOOS {
 	case "darwin":
+		spec.GC = "boehm"
 		platformVersion := "10.12.0"
 		if options.GOARCH == "arm64" {
 			platformVersion = "11.0.0" // first macosx platform with arm64 support
 		}
 		llvmvendor = "apple"
-		spec.Scheduler = "tasks"
+		spec.Scheduler = "threads"
 		spec.Linker = "ld.lld"
 		spec.Libc = "darwin-libSystem"
 		// Use macosx* instead of darwin, otherwise darwin/arm64 will refer to
@@ -394,10 +420,12 @@ func defaultTarget(options *Options) (*TargetSpec, error) {
 		)
 		spec.ExtraFiles = append(spec.ExtraFiles,
 			"src/internal/futex/futex_darwin.c",
+			"src/internal/task/task_threads.c",
 			"src/runtime/os_darwin.c",
 			"src/runtime/runtime_unix.c",
 			"src/runtime/signal.c")
 	case "linux":
+		spec.GC = "boehm"
 		spec.Scheduler = "threads"
 		spec.Linker = "ld.lld"
 		spec.RTLib = "compiler-rt"
@@ -423,25 +451,36 @@ func defaultTarget(options *Options) (*TargetSpec, error) {
 			"src/runtime/runtime_unix.c",
 			"src/runtime/signal.c")
 	case "windows":
+		spec.GC = "boehm"
 		spec.Scheduler = "tasks"
 		spec.Linker = "ld.lld"
 		spec.Libc = "mingw-w64"
-		// Note: using a medium code model, low image base and no ASLR
-		// because Go doesn't really need those features. ASLR patches
-		// around issues for unsafe languages like C/C++ that are not
-		// normally present in Go (without explicitly opting in).
-		// For more discussion:
-		// https://groups.google.com/g/Golang-nuts/c/Jd9tlNc6jUE/m/Zo-7zIP_m3MJ?pli=1
 		switch options.GOARCH {
+		case "386":
+			spec.LDFlags = append(spec.LDFlags,
+				"-m", "i386pe",
+				"--major-os-version", "4",
+				"--major-subsystem-version", "4",
+			)
+			// __udivdi3 is not present in ucrt it seems.
+			spec.RTLib = "compiler-rt"
 		case "amd64":
+			// Note: using a medium code model, low image base and no ASLR
+			// because Go doesn't really need those features. ASLR patches
+			// around issues for unsafe languages like C/C++ that are not
+			// normally present in Go (without explicitly opting in).
+			// For more discussion:
+			// https://groups.google.com/g/Golang-nuts/c/Jd9tlNc6jUE/m/Zo-7zIP_m3MJ?pli=1
 			spec.LDFlags = append(spec.LDFlags,
 				"-m", "i386pep",
 				"--image-base", "0x400000",
 			)
+			spec.RTLib = "compiler-rt"
 		case "arm64":
 			spec.LDFlags = append(spec.LDFlags,
 				"-m", "arm64pe",
 			)
+			spec.RTLib = "compiler-rt"
 		}
 		spec.LDFlags = append(spec.LDFlags,
 			"-Bdynamic",
@@ -449,27 +488,20 @@ func defaultTarget(options *Options) (*TargetSpec, error) {
 			"--no-insert-timestamp",
 			"--no-dynamicbase",
 		)
-	case "wasip1":
-		spec.GC = "" // use default GC
-		spec.Scheduler = "asyncify"
-		spec.Linker = "wasm-ld"
-		spec.RTLib = "compiler-rt"
-		spec.Libc = "wasi-libc"
-		spec.DefaultStackSize = 1024 * 64 // 64kB
-		spec.LDFlags = append(spec.LDFlags,
-			"--stack-first",
-			"--no-demangle",
-		)
-		spec.Emulator = "wasmtime run --dir={tmpDir}::/tmp {}"
 		spec.ExtraFiles = append(spec.ExtraFiles,
-			"src/runtime/asm_tinygowasm.S",
-			"src/internal/task/task_asyncify_wasm.S",
-		)
-		llvmos = "wasi"
+			"src/runtime/runtime_windows.c")
+	case "wasm", "wasip1", "wasip2":
+		return nil, fmt.Errorf("GOOS=%s but GOARCH is unset. Please set GOARCH to wasm", options.GOOS)
 	default:
 		return nil, fmt.Errorf("unknown GOOS=%s", options.GOOS)
 	}

+	if spec.GC == "boehm" {
+		// Add this file only when needed. This fixes a build failure on
+		// Windows.
+		spec.ExtraFiles = append(spec.ExtraFiles, "src/runtime/gc_boehm.c")
+	}
+
 	// Target triples (which actually have four components, but are called
 	// triples for historical reasons) have the form:
 	//   arch-vendor-os-environment
@@ -501,7 +533,6 @@ func defaultTarget(options *Options) (*TargetSpec, error) {
 		}
 		spec.ExtraFiles = append(spec.ExtraFiles, "src/runtime/asm_"+asmGoarch+suffix+".S")
 		spec.ExtraFiles = append(spec.ExtraFiles, "src/internal/task/task_stack_"+asmGoarch+suffix+".S")
-		spec.ExtraFiles = append(spec.ExtraFiles, "src/internal/task/task_cores.c")
 	}

 	// Configure the emulator.
@@ -23,6 +23,37 @@ func TestLoadTarget(t *testing.T) {
 	}
 }

+func TestGetTargetSpecs_InheritableOnlyTargetsExcluded(t *testing.T) {
+	specs, err := GetTargetSpecs()
+	if err != nil {
+		t.Fatal("GetTargetSpecs failed:", err)
+	}
+
+	// Inheritable-only processor-level targets should not appear in the listing.
+	inheritableOnlyTargets := []string{"esp32", "esp32c3", "esp32s3", "esp8266", "rp2040", "rp2350", "rp2350b"}
+	for _, name := range inheritableOnlyTargets {
+		if _, ok := specs[name]; ok {
+			t.Errorf("inheritable-only target %q should not appear in GetTargetSpecs", name)
+		}
+	}
+
+	// Board targets that inherit from inheritable-only targets should still appear.
+	boardTargets := []string{"esp32-coreboard-v2", "pico"}
+	for _, name := range boardTargets {
+		if _, ok := specs[name]; !ok {
+			t.Errorf("board target %q should appear in GetTargetSpecs", name)
+		}
+	}
+}
+
+func TestLoadTarget_InheritableOnlyTargetStillLoadable(t *testing.T) {
+	// Inheritable-only targets should still be loadable directly (for building).
+	_, err := LoadTarget(&Options{Target: "esp32"})
+	if err != nil {
+		t.Errorf("LoadTarget should still load inheritable-only target esp32: %v", err)
+	}
+}
+
 func TestOverrideProperties(t *testing.T) {
 	baseAutoStackSize := true
 	base := &TargetSpec{
@@ -81,3 +112,52 @@ func TestOverrideProperties(t *testing.T) {
 	}

 }
+
+func TestConfigLinkerFlavor(t *testing.T) {
+	tests := []struct {
+		name   string
+		target *TargetSpec
+		goos   string
+		want   string
+	}{
+		{
+			name:   "default gnu",
+			target: &TargetSpec{},
+			goos:   "linux",
+			want:   "gnu",
+		},
+		{
+			name:   "default coff",
+			target: &TargetSpec{},
+			goos:   "windows",
+			want:   "coff",
+		},
+		{
+			name:   "default darwin",
+			target: &TargetSpec{},
+			goos:   "darwin",
+			want:   "darwin",
+		},
+		{
+			name: "target override",
+			target: &TargetSpec{
+				LinkerFlavor: "coff",
+			},
+			goos: "linux",
+			want: "coff",
+		},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			tc.target.GOOS = tc.goos
+			config := &Config{
+				Options: &Options{},
+				Target:  tc.target,
+			}
+			if got := config.LinkerFlavor(); got != tc.want {
+				t.Fatalf("LinkerFlavor() = %q, want %q", got, tc.want)
+			}
+		})
+	}
+}
@@ -0,0 +1,12 @@
+//go:build llvm22
+
+package compileopts
+
+import "strings"
+
+// ClangTriple returns the target triple to pass to Clang's --target flag.
+// LLVM 22 deprecated the "wasm32-unknown-wasi" triple in favor of
+// "wasm32-unknown-wasip1", so we substitute it here to avoid warnings.
+func ClangTriple(triple string) string {
+	return strings.Replace(triple, "wasm32-unknown-wasi", "wasm32-unknown-wasip1", 1)
+}
@@ -0,0 +1,9 @@
+//go:build !llvm22
+
+package compileopts
+
+// ClangTriple returns the target triple to pass to Clang's --target flag.
+// For pre-LLVM 22, the triple is used as-is.
+func ClangTriple(triple string) string {
+	return triple
+}
@@ -18,11 +18,12 @@ var stdlibAliases = map[string]string{
 	// crypto packages
 	"crypto/ed25519/internal/edwards25519/field.feMul": "crypto/ed25519/internal/edwards25519/field.feMulGeneric",
 	"crypto/internal/edwards25519/field.feSquare":      "crypto/ed25519/internal/edwards25519/field.feSquareGeneric",
-	"crypto/md5.block":         "crypto/md5.blockGeneric",
-	"crypto/sha1.block":        "crypto/sha1.blockGeneric",
-	"crypto/sha1.blockAMD64":   "crypto/sha1.blockGeneric",
-	"crypto/sha256.block":      "crypto/sha256.blockGeneric",
-	"crypto/sha512.blockAMD64": "crypto/sha512.blockGeneric",
+	"crypto/md5.block":           "crypto/md5.blockGeneric",
+	"crypto/sha1.block":          "crypto/sha1.blockGeneric",
+	"crypto/sha1.blockAMD64":     "crypto/sha1.blockGeneric",
+	"crypto/sha256.block":        "crypto/sha256.blockGeneric",
+	"crypto/sha512.blockAMD64":   "crypto/sha512.blockGeneric",
+	"internal/chacha8rand.block": "internal/chacha8rand.block_generic",

 	// AES
 	"crypto/aes.decryptBlockAsm": "crypto/aes.decryptBlock",
@@ -241,24 +241,37 @@ func (b *builder) createRuntimeAssert(assert llvm.Value, blockPrefix, assertFunc
 		}
 	}

-	// Put the fault block at the end of the function and the next block at the
-	// current insert position.
-	faultBlock := b.ctx.AddBasicBlock(b.llvmFn, blockPrefix+".throw")
+	faultBlock := b.getRuntimeAssertBlock(blockPrefix, assertFunc)
 	nextBlock := b.insertBasicBlock(blockPrefix + ".next")
-	b.blockExits[b.currentBlock] = nextBlock // adjust outgoing block for phi nodes
+	b.currentBlockInfo.exit = nextBlock // adjust outgoing block for phi nodes

 	// Now branch to the out-of-bounds or the regular block.
 	b.CreateCondBr(assert, faultBlock, nextBlock)

-	// Fail: the assert triggered so panic.
-	b.SetInsertPointAtEnd(faultBlock)
-	b.createRuntimeCall(assertFunc, nil, "")
-	b.CreateUnreachable()
-
 	// Ok: assert didn't trigger so continue normally.
 	b.SetInsertPointAtEnd(nextBlock)
 }

+func (b *builder) getRuntimeAssertBlock(blockPrefix, assertFunc string) llvm.BasicBlock {
+	if b.runtimeAssertBlocks == nil {
+		b.runtimeAssertBlocks = make(map[string]llvm.BasicBlock)
+	}
+	if block := b.runtimeAssertBlocks[assertFunc]; !block.IsNil() {
+		return block
+	}
+	savedBlock := b.GetInsertBlock()
+	block := b.ctx.AddBasicBlock(b.llvmFn, blockPrefix+".throw")
+	b.runtimeAssertBlocks[assertFunc] = block
+	b.SetInsertPointAtEnd(block)
+	if b.hasDeferFrame() {
+		b.createFaultCheckpoint()
+	}
+	b.createRuntimeCall(assertFunc, nil, "")
+	b.CreateUnreachable()
+	b.SetInsertPointAtEnd(savedBlock)
+	return block
+}
+
 // extendInteger extends the value to at least targetType using a zero or sign
 // extend. The resulting value is not truncated: it may still be bigger than
 // targetType.
@@ -32,6 +32,12 @@ const (
 	// Whether this is a full or partial Go parameter (int, slice, etc).
 	// The extra context parameter is not a Go parameter.
 	paramIsGoParam = 1 << iota
+
+	// Whether this is a readonly parameter (for example, a string pointer).
+	paramIsReadonly
+
+	// Whether this parameter is passed through backing storage.
+	paramIsIndirect
 )

 // createRuntimeCallCommon creates a runtime call. Use createRuntimeCall or
@@ -76,7 +82,15 @@ func (b *builder) createCall(fnType llvm.Type, fn llvm.Value, args []llvm.Value,
 		fragments := b.expandFormalParam(arg)
 		expanded = append(expanded, fragments...)
 	}
-	return b.CreateCall(fnType, fn, expanded, name)
+	call := b.CreateCall(fnType, fn, expanded, name)
+	if !fn.IsAFunction().IsNil() {
+		if cc := fn.FunctionCallConv(); cc != llvm.CCallConv {
+			// Set a different calling convention if needed.
+			// This is needed for GetModuleHandleExA on Windows, for example.
+			call.SetInstructionCallConv(cc)
+		}
+	}
+	return call
 }

 // createInvoke is like createCall but continues execution at the landing pad if
@@ -91,6 +105,18 @@ func (b *builder) createInvoke(fnType llvm.Type, fn llvm.Value, args []llvm.Valu
 // Expand an argument type to a list that can be used in a function call
 // parameter list.
 func (c *compilerContext) expandFormalParamType(t llvm.Type, name string, goType types.Type) []paramInfo {
+	if c.isIndirectAggregate(t) {
+		return []paramInfo{{
+			llvmType: c.dataPtrType,
+			name:     name,
+			elemSize: c.targetData.TypeAllocSize(t),
+			flags:    paramIsGoParam | paramIsReadonly | paramIsIndirect,
+		}}
+	}
+	return c.expandDirectFormalParamType(t, name, goType)
+}
+
+func (c *compilerContext) expandDirectFormalParamType(t llvm.Type, name string, goType types.Type) []paramInfo {
 	switch t.TypeKind() {
 	case llvm.StructTypeKind:
 		fieldInfos := c.flattenAggregateType(t, name, goType)
@@ -104,6 +130,38 @@ func (c *compilerContext) expandFormalParamType(t llvm.Type, name string, goType
 	return []paramInfo{c.getParamInfo(t, name, goType)}
 }

+func (c *compilerContext) storedParamType(t llvm.Type, exported bool) llvm.Type {
+	if c.isIndirectParam(t, exported) {
+		return c.dataPtrType
+	}
+	return t
+}
+
+func (c *compilerContext) isIndirectParam(t llvm.Type, exported bool) bool {
+	return !exported && c.isIndirectAggregate(t)
+}
+
+func (b *builder) appendStoredValueTypes(valueTypes []llvm.Type, values []ssa.Value, exported bool) []llvm.Type {
+	for _, value := range values {
+		valueTypes = append(valueTypes, b.storedParamType(b.getLLVMType(value.Type()), exported))
+	}
+	return valueTypes
+}
+
+func (b *builder) appendStoredParamTypes(valueTypes []llvm.Type, params []*types.Var, exported bool) []llvm.Type {
+	for _, param := range params {
+		valueTypes = append(valueTypes, b.storedParamType(b.getLLVMType(param.Type()), exported))
+	}
+	return valueTypes
+}
+
+func (b *builder) prependIndirectResult(sig *types.Signature, exported bool, params []llvm.Value, name string) []llvm.Value {
+	if resultType, indirect := b.hasIndirectResult(sig); !exported && indirect {
+		return append([]llvm.Value{b.createIndirectStorage(resultType, name)}, params...)
+	}
+	return params
+}
+
 // expandFormalParamOffsets returns a list of offsets from the start of an
 // object of type t after it would have been split up by expandFormalParam. This
 // is useful for debug information, where it is necessary to know the offset
@@ -159,6 +217,7 @@ func (c *compilerContext) flattenAggregateType(t llvm.Type, name string, goType
 				continue
 			}
 			suffix := strconv.Itoa(i)
+			isString := false
 			if goType != nil {
 				// Try to come up with a good suffix for this struct field,
 				// depending on which Go type it's based on.
@@ -175,12 +234,16 @@ func (c *compilerContext) flattenAggregateType(t llvm.Type, name string, goType
 						suffix = []string{"r", "i"}[i]
 					case types.String:
 						suffix = []string{"data", "len"}[i]
+						isString = true
 					}
 				case *types.Signature:
 					suffix = []string{"context", "funcptr"}[i]
 				}
 			}
 			subInfos := c.flattenAggregateType(subfield, name+"."+suffix, extractSubfield(goType, i))
+			if isString {
+				subInfos[0].flags |= paramIsReadonly
+			}
 			paramInfos = append(paramInfos, subInfos...)
 		}
 		return paramInfos
@@ -30,17 +30,15 @@ func (b *builder) createMakeChan(expr *ssa.MakeChan) llvm.Value {
 // actual channel send operation during goroutine lowering.
 func (b *builder) createChanSend(instr *ssa.Send) {
 	ch := b.getValue(instr.Chan, getPos(instr))
-	chanValue := b.getValue(instr.X, getPos(instr))

 	// store value-to-send
 	valueType := b.getLLVMType(instr.X.Type())
 	isZeroSize := b.targetData.TypeAllocSize(valueType) == 0
-	var valueAlloca, valueAllocaSize llvm.Value
+	var storage valueStorage
 	if isZeroSize {
-		valueAlloca = llvm.ConstNull(b.dataPtrType)
+		storage.ptr = llvm.ConstNull(b.dataPtrType)
 	} else {
-		valueAlloca, valueAllocaSize = b.createTemporaryAlloca(valueType, "chan.value")
-		b.CreateStore(chanValue, valueAlloca)
+		storage = b.getValueStorage(instr.X, "chan.value")
 	}

 	// Allocate buffer for the channel operation.
@@ -48,15 +46,13 @@ func (b *builder) createChanSend(instr *ssa.Send) {
 	channelOpAlloca, channelOpAllocaSize := b.createTemporaryAlloca(channelOp, "chan.op")

 	// Do the send.
-	b.createRuntimeCall("chanSend", []llvm.Value{ch, valueAlloca, channelOpAlloca}, "")
+	b.createRuntimeInvoke("chanSend", []llvm.Value{ch, storage.ptr, channelOpAlloca}, "")

 	// End the lifetime of the allocas.
 	// This also works around a bug in CoroSplit, at least in LLVM 8:
 	// https://bugs.llvm.org/show_bug.cgi?id=41742
 	b.emitLifetimeEnd(channelOpAlloca, channelOpAllocaSize)
-	if !isZeroSize {
-		b.emitLifetimeEnd(valueAlloca, valueAllocaSize)
-	}
+	b.endValueStorage(storage)
 }

 // createChanRecv emits a pseudo chan receive operation. It is lowered to the
@@ -66,42 +62,22 @@ func (b *builder) createChanRecv(unop *ssa.UnOp) llvm.Value {
 	ch := b.getValue(unop.X, getPos(unop))

 	// Allocate memory to receive into.
-	isZeroSize := b.targetData.TypeAllocSize(valueType) == 0
-	var valueAlloca, valueAllocaSize llvm.Value
-	if isZeroSize {
-		valueAlloca = llvm.ConstNull(b.dataPtrType)
-	} else {
-		valueAlloca, valueAllocaSize = b.createTemporaryAlloca(valueType, "chan.value")
-	}
+	result := b.createRuntimeValueResult(valueType, unop.CommaOk, true, "chan")

 	// Allocate buffer for the channel operation.
 	channelOp := b.getLLVMRuntimeType("channelOp")
 	channelOpAlloca, channelOpAllocaSize := b.createTemporaryAlloca(channelOp, "chan.op")

 	// Do the receive.
-	commaOk := b.createRuntimeCall("chanRecv", []llvm.Value{ch, valueAlloca, channelOpAlloca}, "")
-	var received llvm.Value
-	if isZeroSize {
-		received = llvm.ConstNull(valueType)
-	} else {
-		received = b.CreateLoad(valueType, valueAlloca, "chan.received")
-		b.emitLifetimeEnd(valueAlloca, valueAllocaSize)
-	}
+	commaOk := b.createRuntimeCall("chanRecv", []llvm.Value{ch, result.valuePtr, channelOpAlloca}, "")
+	received := result.finish(b, commaOk, "chan.received")
 	b.emitLifetimeEnd(channelOpAlloca, channelOpAllocaSize)
-
-	if unop.CommaOk {
-		tuple := llvm.Undef(b.ctx.StructType([]llvm.Type{valueType, b.ctx.Int1Type()}, false))
-		tuple = b.CreateInsertValue(tuple, received, 0, "")
-		tuple = b.CreateInsertValue(tuple, commaOk, 1, "")
-		return tuple
-	} else {
-		return received
-	}
+	return received
 }

 // createChanClose closes the given channel.
 func (b *builder) createChanClose(ch llvm.Value) {
-	b.createRuntimeCall("chanClose", []llvm.Value{ch}, "")
+	b.createRuntimeInvoke("chanClose", []llvm.Value{ch}, "")
 }

 // createSelect emits all IR necessary for a select statements. That's a
@@ -170,9 +146,7 @@ func (b *builder) createSelect(expr *ssa.Select) llvm.Value {
 		case types.SendOnly:
 			// Store this value in an alloca and put a pointer to this alloca
 			// in the send state.
-			sendValue := b.getValue(state.Send, state.Pos)
-			alloca := llvmutil.CreateEntryBlockAlloca(b.Builder, sendValue.Type(), "select.send.value")
-			b.CreateStore(sendValue, alloca)
+			alloca := b.getSelectSendStorage(state.Send)
 			selectState = b.CreateInsertValue(selectState, alloca, 1, "")
 		default:
 			panic("unreachable")
@@ -280,7 +254,17 @@ func (b *builder) getChanSelectResult(expr *ssa.Extract) llvm.Value {
 		// receive can proceed at a time) so we'll get that alloca, bitcast
 		// it to the correct type, and dereference it.
 		recvbuf := b.selectRecvBuf[expr.Tuple.(*ssa.Select)]
-		typ := b.getLLVMType(expr.Type())
-		return b.CreateLoad(typ, recvbuf, "")
+		return b.loadFromStorage(recvbuf, expr.Type(), "select.received")
 	}
 }
+
+func (b *builder) getSelectSendStorage(value ssa.Value) llvm.Value {
+	typ := b.getLLVMType(value.Type())
+	if b.isIndirectAggregate(typ) {
+		return b.getValuePointer(value)
+	}
+	llvmValue := b.getValue(value, getPos(value))
+	ptr := llvmutil.CreateEntryBlockAlloca(b.Builder, typ, "select.send.value")
+	b.CreateStore(llvmValue, ptr)
+	return ptr
+}
@@ -58,6 +58,7 @@ type Config struct {
 	MaxStackAlloc      uint64
 	NeedsStackObjects  bool
 	Debug              bool // Whether to emit debug information in the LLVM module.
+	Nobounds           bool // Whether to skip bounds checks
 	PanicStrategy      string
 }

@@ -89,8 +90,10 @@ type compilerContext struct {
 	astComments      map[string]*ast.CommentGroup
 	embedGlobals     map[string][]*loader.EmbedFile
 	pkg              *types.Package
-	packageDir       string // directory for this package
+	loaderPkg        *loader.Package // current package being compiled (for AST access)
+	packageDir       string          // directory for this package
 	runtimePkg       *types.Package
+	localTypeNames   typeutil.Map // *types.Named (synthetic local from generic instantiation) -> string
 }

 // newCompilerContext returns a new compiler context ready for use, most
@@ -151,10 +154,14 @@ type builder struct {
 	llvmFnType        llvm.Type
 	llvmFn            llvm.Value
 	info              functionInfo
-	locals            map[ssa.Value]llvm.Value            // local variables
-	blockEntries      map[*ssa.BasicBlock]llvm.BasicBlock // a *ssa.BasicBlock may be split up
-	blockExits        map[*ssa.BasicBlock]llvm.BasicBlock // these are the exit blocks
+	locals            map[ssa.Value]llvm.Value // local variables
+	indirectValues    map[ssa.Value]llvm.Value
+	indirectReturn    llvm.Value
+	blockInfo         []blockInfo
 	currentBlock      *ssa.BasicBlock
+	currentBlockInfo  *blockInfo
+	tarjanStack       []uint
+	tarjanIndex       uint
 	phis              []phiNode
 	deferPtr          llvm.Value
 	deferFrame        llvm.Value
@@ -164,7 +171,7 @@ type builder struct {
 	dilocals          map[*types.Var]llvm.Metadata
 	initInlinedAt     llvm.Metadata            // fake inlinedAt position
 	initPseudoFuncs   map[string]llvm.Metadata // fake "inlined" functions for proper init debug locations
-	allDeferFuncs     []interface{}
+	allDeferFuncs     []any
 	deferFuncs        map[*ssa.Function]int
 	deferInvokeFuncs  map[string]int
 	deferClosureFuncs map[*ssa.Function]int
@@ -173,6 +180,9 @@ type builder struct {
 	deferBuiltinFuncs map[ssa.Value]deferBuiltin
 	runDefersBlock    []llvm.BasicBlock
 	afterDefersBlock  []llvm.BasicBlock
+
+	runtimeAssertBlocks  map[string]llvm.BasicBlock
+	interfaceAssertBlock llvm.BasicBlock
 }

 func newBuilder(c *compilerContext, irbuilder llvm.Builder, f *ssa.Function) *builder {
@@ -185,12 +195,24 @@ func newBuilder(c *compilerContext, irbuilder llvm.Builder, f *ssa.Function) *bu
 		llvmFn:          fn,
 		info:            c.getFunctionInfo(f),
 		locals:          make(map[ssa.Value]llvm.Value),
+		indirectValues:  make(map[ssa.Value]llvm.Value),
 		dilocals:        make(map[*types.Var]llvm.Metadata),
-		blockEntries:    make(map[*ssa.BasicBlock]llvm.BasicBlock),
-		blockExits:      make(map[*ssa.BasicBlock]llvm.BasicBlock),
 	}
 }

+type blockInfo struct {
+	// entry is the LLVM basic block corresponding to the start of this *ssa.Block.
+	entry llvm.BasicBlock
+
+	// exit is the LLVM basic block corresponding to the end of this *ssa.Block.
+	// It will be different than entry if any of the block's instructions contain internal branches.
+	exit llvm.BasicBlock
+
+	// tarjan holds state for applying Tarjan's strongly connected components algorithm to the CFG.
+	// This is used by defer.go to determine whether to stack- or heap-allocate defer data.
+	tarjan tarjanNode
+}
+
 type deferBuiltin struct {
 	callName string
 	pos      token.Pos
@@ -280,12 +302,18 @@ func CompilePackage(moduleName string, pkg *loader.Package, ssaPkg *ssa.Package,
 	c.packageDir = pkg.OriginalDir()
 	c.embedGlobals = pkg.EmbedGlobals
 	c.pkg = pkg.Pkg
+	c.loaderPkg = pkg
 	c.runtimePkg = ssaPkg.Prog.ImportedPackage("runtime").Pkg
 	c.program = ssaPkg.Prog

 	// Convert AST to SSA.
 	ssaPkg.Build()

+	// Assign names to function-local named types before compiling the
+	// package, so that types declared in different functions (or in
+	// different instantiations of a generic function) do not collide.
+	c.scanLocalTypes(ssaPkg)
+
 	// Initialize debug information.
 	if c.Debug {
 		c.cu = c.dibuilder.CreateCompileUnit(llvm.DICompileUnit{
@@ -300,9 +328,6 @@ func CompilePackage(moduleName string, pkg *loader.Package, ssaPkg *ssa.Package,
 	// Load comments such as //go:extern on globals.
 	c.loadASTComments(pkg)

-	// Predeclare the runtime.alloc function, which is used by the wordpack
-	// functionality.
-	c.getFunction(c.program.ImportedPackage("runtime").Members["alloc"].(*ssa.Function))
 	if c.NeedsStackObjects {
 		// Predeclare trackPointer, which is used everywhere we use runtime.alloc.
 		c.getFunction(c.program.ImportedPackage("runtime").Members["trackPointer"].(*ssa.Function))
@@ -388,7 +413,7 @@ func (c *compilerContext) getLLVMType(goType types.Type) llvm.Type {
 // makeLLVMType creates a LLVM type for a Go type. Don't call this, use
 // getLLVMType instead.
 func (c *compilerContext) makeLLVMType(goType types.Type) llvm.Type {
-	switch typ := goType.(type) {
+	switch typ := types.Unalias(goType).(type) {
 	case *types.Array:
 		elemType := c.getLLVMType(typ.Elem())
 		return llvm.ArrayType(elemType, int(typ.Len()))
@@ -400,19 +425,19 @@ func (c *compilerContext) makeLLVMType(goType types.Type) llvm.Type {
 			return c.ctx.Int8Type()
 		case types.Int16, types.Uint16:
 			return c.ctx.Int16Type()
-		case types.Int32, types.Uint32:
+		case types.Int32, types.Uint32, types.UntypedRune:
 			return c.ctx.Int32Type()
-		case types.Int, types.Uint:
+		case types.Int, types.Uint, types.UntypedInt:
 			return c.intType
 		case types.Int64, types.Uint64:
 			return c.ctx.Int64Type()
 		case types.Float32:
 			return c.ctx.FloatType()
-		case types.Float64:
+		case types.Float64, types.UntypedFloat:
 			return c.ctx.DoubleType()
 		case types.Complex64:
 			return c.ctx.StructType([]llvm.Type{c.ctx.FloatType(), c.ctx.FloatType()}, false)
-		case types.Complex128:
+		case types.Complex128, types.UntypedComplex:
 			return c.ctx.StructType([]llvm.Type{c.ctx.DoubleType(), c.ctx.DoubleType()}, false)
 		case types.String, types.UntypedString:
 			return c.getLLVMRuntimeType("_string")
@@ -496,6 +521,21 @@ func (c *compilerContext) createDIType(typ types.Type) llvm.Metadata {
 	llvmType := c.getLLVMType(typ)
 	sizeInBytes := c.targetData.TypeAllocSize(llvmType)
 	switch typ := typ.(type) {
+	case *types.Alias:
+		// Implement types.Alias just like types.Named: by treating them like a
+		// C typedef.
+		temporaryMDNode := c.dibuilder.CreateReplaceableCompositeType(llvm.Metadata{}, llvm.DIReplaceableCompositeType{
+			Tag:         dwarf.TagTypedef,
+			SizeInBits:  sizeInBytes * 8,
+			AlignInBits: uint32(c.targetData.ABITypeAlignment(llvmType)) * 8,
+		})
+		c.ditypes[typ] = temporaryMDNode
+		md := c.dibuilder.CreateTypedef(llvm.DITypedef{
+			Type: c.getDIType(types.Unalias(typ)), // TODO: use typ.Rhs in Go 1.23
+			Name: typ.String(),
+		})
+		temporaryMDNode.ReplaceAllUsesWith(md)
+		return md
 	case *types.Array:
 		return c.dibuilder.CreateArrayType(llvm.DIArrayType{
 			SizeInBits:  sizeInBytes * 8,
@@ -833,10 +873,9 @@ func (c *compilerContext) createPackage(irbuilder llvm.Builder, pkg *ssa.Package
 			}
 			// Create the function definition.
 			b := newBuilder(c, irbuilder, member)
-			if _, ok := mathToLLVMMapping[member.RelString(nil)]; ok {
+			if ok := b.defineMathOp(); ok {
 				// The body of this function (if there is one) is ignored and
 				// replaced with a LLVM intrinsic call.
-				b.defineMathOp()
 				continue
 			}
 			if ok := b.defineMathBitsIntrinsic(); ok {
@@ -844,6 +883,10 @@ func (c *compilerContext) createPackage(irbuilder llvm.Builder, pkg *ssa.Package
 				// with a LLVM intrinsic.
 				continue
 			}
+			if ok := b.defineCryptoIntrinsic(); ok {
+				// Body of this function was replaced
+				continue
+			}
 			if member.Blocks == nil {
 				// Try to define this as an intrinsic function.
 				b.defineIntrinsicFunction()
@@ -858,6 +901,11 @@ func (c *compilerContext) createPackage(irbuilder llvm.Builder, pkg *ssa.Package
 				// Interfaces don't have concrete methods.
 				continue
 			}
+			if _, isalias := member.Type().(*types.Alias); isalias {
+				// Aliases don't need to be redefined, since they just refer to
+				// an already existing type whose methods will be defined.
+				continue
+			}

 			// Named type. We should make sure all methods are created.
 			// This includes both functions with pointer receivers and those
@@ -1199,14 +1247,29 @@ func (b *builder) createFunctionStart(intrinsic bool) {
 		// intrinsic (like an atomic operation). Create the entry block
 		// manually.
 		entryBlock = b.ctx.AddBasicBlock(b.llvmFn, "entry")
-	} else {
-		for _, block := range b.fn.DomPreorder() {
-			llvmBlock := b.ctx.AddBasicBlock(b.llvmFn, block.Comment)
-			b.blockEntries[block] = llvmBlock
-			b.blockExits[block] = llvmBlock
+		// Intrinsics may create internal branches (e.g. nil checks).
+		// They will attempt to access b.currentBlockInfo to update the exit block.
+		// Create some fake block info for them to access.
+		blockInfo := []blockInfo{
+			{
+				entry: entryBlock,
+				exit:  entryBlock,
+			},
 		}
+		b.blockInfo = blockInfo
+		b.currentBlockInfo = &blockInfo[0]
+	} else {
+		blocks := b.fn.Blocks
+		blockInfo := make([]blockInfo, len(blocks))
+		for _, block := range b.fn.DomPreorder() {
+			info := &blockInfo[block.Index]
+			llvmBlock := b.ctx.AddBasicBlock(b.llvmFn, block.Comment)
+			info.entry = llvmBlock
+			info.exit = llvmBlock
+		}
+		b.blockInfo = blockInfo
 		// Normal functions have an entry block.
-		entryBlock = b.blockEntries[b.fn.Blocks[0]]
+		entryBlock = blockInfo[0].entry
 	}
 	b.SetInsertPointAtEnd(entryBlock)

@@ -1222,10 +1285,28 @@ func (b *builder) createFunctionStart(intrinsic bool) {

 	// Load function parameters
 	llvmParamIndex := 0
+	if _, indirectResult := b.hasIndirectResult(b.fn.Signature); indirectResult && !b.info.exported {
+		b.indirectReturn = b.llvmFn.Param(llvmParamIndex)
+		b.indirectReturn.SetName("return")
+		llvmParamIndex++
+	}
 	for _, param := range b.fn.Params {
 		llvmType := b.getLLVMType(param.Type())
+		if b.isIndirectParam(llvmType, b.info.exported) {
+			llvmParam := b.llvmFn.Param(llvmParamIndex)
+			llvmParam.SetName(param.Name())
+			b.indirectValues[param] = llvmParam
+			llvmParamIndex++
+			continue
+		}
+		var paramInfos []paramInfo
+		if b.info.exported {
+			paramInfos = b.expandDirectFormalParamType(llvmType, param.Name(), param.Type())
+		} else {
+			paramInfos = b.expandFormalParamType(llvmType, param.Name(), param.Type())
+		}
 		fields := make([]llvm.Value, 0, 1)
-		for _, info := range b.expandFormalParamType(llvmType, param.Name(), param.Type()) {
+		for _, info := range paramInfos {
 			param := b.llvmFn.Param(llvmParamIndex)
 			param.SetName(info.name)
 			fields = append(fields, param)
@@ -1302,8 +1383,9 @@ func (b *builder) createFunction() {
 		if b.DumpSSA {
 			fmt.Printf("%d: %s:\n", block.Index, block.Comment)
 		}
-		b.SetInsertPointAtEnd(b.blockEntries[block])
 		b.currentBlock = block
+		b.currentBlockInfo = &b.blockInfo[block.Index]
+		b.SetInsertPointAtEnd(b.currentBlockInfo.entry)
 		for _, instr := range block.Instrs {
 			if instr, ok := instr.(*ssa.DebugRef); ok {
 				if !b.Debug {
@@ -1362,8 +1444,8 @@ func (b *builder) createFunction() {
 	for _, phi := range b.phis {
 		block := phi.ssa.Block()
 		for i, edge := range phi.ssa.Edges {
-			llvmVal := b.getValue(edge, getPos(phi.ssa))
-			llvmBlock := b.blockExits[block.Preds[i]]
+			llvmVal := b.getCallArgument(edge, false)
+			llvmBlock := b.blockInfo[block.Preds[i].Index].exit
 			phi.llvm.AddIncoming([]llvm.Value{llvmVal}, []llvm.BasicBlock{llvmBlock})
 		}
 	}
@@ -1371,6 +1453,9 @@ func (b *builder) createFunction() {
 	if b.NeedsStackObjects {
 		// Track phi nodes.
 		for _, phi := range b.phis {
+			if b.isOversizedAggregate(phi.ssa.Type()) {
+				continue
+			}
 			insertPoint := llvm.NextInstruction(phi.llvm)
 			for !insertPoint.IsAPHINode().IsNil() {
 				insertPoint = llvm.NextInstruction(insertPoint)
@@ -1462,10 +1547,7 @@ func (b *builder) createInstruction(instr ssa.Instruction) {
 			b.diagnostics = append(b.diagnostics, err)
 			b.locals[instr] = llvm.Undef(b.getLLVMType(instr.Type()))
 		} else {
-			b.locals[instr] = value
-			if len(*instr.Referrers()) != 0 && b.NeedsStackObjects {
-				b.trackExpr(instr, value)
-			}
+			b.setValue(instr, value)
 		}
 	case *ssa.DebugRef:
 		// ignore
@@ -1477,18 +1559,16 @@ func (b *builder) createInstruction(instr ssa.Instruction) {
 	case *ssa.If:
 		cond := b.getValue(instr.Cond, getPos(instr))
 		block := instr.Block()
-		blockThen := b.blockEntries[block.Succs[0]]
-		blockElse := b.blockEntries[block.Succs[1]]
+		blockThen := b.blockInfo[block.Succs[0].Index].entry
+		blockElse := b.blockInfo[block.Succs[1].Index].entry
 		b.CreateCondBr(cond, blockThen, blockElse)
 	case *ssa.Jump:
-		blockJump := b.blockEntries[instr.Block().Succs[0]]
+		blockJump := b.blockInfo[instr.Block().Succs[0].Index].entry
 		b.CreateBr(blockJump)
 	case *ssa.MapUpdate:
 		m := b.getValue(instr.Map, getPos(instr))
-		key := b.getValue(instr.Key, getPos(instr))
-		value := b.getValue(instr.Value, getPos(instr))
 		mapType := instr.Map.Type().Underlying().(*types.Map)
-		b.createMapUpdate(mapType.Key(), m, key, value, instr.Pos())
+		b.createMapUpdate(mapType.Key(), m, instr.Key, instr.Value, instr.Pos())
 	case *ssa.Panic:
 		value := b.getValue(instr.X, getPos(instr))
 		b.createRuntimeInvoke("_panic", []llvm.Value{value}, "")
@@ -1497,19 +1577,7 @@ func (b *builder) createInstruction(instr ssa.Instruction) {
 		if b.hasDeferFrame() {
 			b.createRuntimeCall("destroyDeferFrame", []llvm.Value{b.deferFrame}, "")
 		}
-		if len(instr.Results) == 0 {
-			b.CreateRetVoid()
-		} else if len(instr.Results) == 1 {
-			b.CreateRet(b.getValue(instr.Results[0], getPos(instr)))
-		} else {
-			// Multiple return values. Put them all in a struct.
-			retVal := llvm.ConstNull(b.llvmFn.GlobalValueType().ReturnType())
-			for i, result := range instr.Results {
-				val := b.getValue(result, getPos(instr))
-				retVal = b.CreateInsertValue(retVal, val, i, "")
-			}
-			b.CreateRet(retVal)
-		}
+		b.createReturn(instr.Results, getPos(instr))
 	case *ssa.RunDefers:
 		// Note where we're going to put the rundefers block
 		run := b.insertBasicBlock("rundefers.block")
@@ -1523,18 +1591,246 @@ func (b *builder) createInstruction(instr ssa.Instruction) {
 		b.createChanSend(instr)
 	case *ssa.Store:
 		llvmAddr := b.getValue(instr.Addr, getPos(instr))
-		llvmVal := b.getValue(instr.Val, getPos(instr))
 		b.createNilCheck(instr.Addr, llvmAddr, "store")
-		if b.targetData.TypeAllocSize(llvmVal.Type()) == 0 {
+		llvmType := b.getLLVMType(instr.Val.Type())
+		if b.targetData.TypeAllocSize(llvmType) == 0 {
 			// nothing to store
 			return
 		}
-		b.CreateStore(llvmVal, llvmAddr)
+		b.storeValue(llvmAddr, instr.Val)
 	default:
 		b.addError(instr.Pos(), "unknown instruction: "+instr.String())
 	}
 }

+func (b *builder) setValue(value ssa.Value, llvmValue llvm.Value) {
+	if b.isAggregateValue(value.Type()) && !llvmValue.IsNil() && llvmValue.Type().TypeKind() == llvm.PointerTypeKind {
+		b.indirectValues[value] = llvmValue
+		return
+	}
+	b.locals[value] = llvmValue
+	if len(*value.Referrers()) != 0 && b.NeedsStackObjects {
+		b.trackExpr(value, llvmValue)
+	}
+}
+
+func (b *builder) createReturn(results []ssa.Value, pos token.Pos) {
+	if len(results) == 0 {
+		b.CreateRetVoid()
+	} else if !b.indirectReturn.IsNil() {
+		if len(results) == 1 {
+			b.storeValue(b.indirectReturn, results[0])
+		} else {
+			returnType := b.getLLVMResultType(b.fn.Signature)
+			for i, result := range results {
+				fieldPtr := b.CreateStructGEP(returnType, b.indirectReturn, i, "")
+				b.storeValue(fieldPtr, result)
+			}
+		}
+		b.CreateRetVoid()
+	} else if len(results) == 1 {
+		b.CreateRet(b.getValue(results[0], pos))
+	} else {
+		result := llvm.ConstNull(b.llvmFn.GlobalValueType().ReturnType())
+		for i, value := range results {
+			result = b.CreateInsertValue(result, b.getValue(value, pos), i, "")
+		}
+		b.CreateRet(result)
+	}
+}
+
+func (b *builder) isOversizedAggregate(typ types.Type) bool {
+	if !b.isAggregateValue(typ) {
+		return false
+	}
+	return b.isIndirectAggregate(b.getLLVMType(typ))
+}
+
+func (b *builder) isAggregateValue(typ types.Type) bool {
+	if tuple, ok := typ.(*types.Tuple); ok {
+		for i := 0; i < tuple.Len(); i++ {
+			if !isLLVMValueType(tuple.At(i).Type()) {
+				return false
+			}
+		}
+	} else {
+		switch typ.Underlying().(type) {
+		case *types.Array, *types.Struct:
+		default:
+			return false
+		}
+		if !isLLVMValueType(typ) {
+			return false
+		}
+	}
+	return true
+}
+
+func (b *builder) getValuePointer(value ssa.Value) llvm.Value {
+	if ptr, ok := b.indirectValues[value]; ok {
+		return ptr
+	}
+	llvmType := b.getLLVMType(value.Type())
+	ptr := b.createIndirectStorage(llvmType, value.Name())
+	b.storeValue(ptr, value)
+	return ptr
+}
+
+func (b *builder) getCallArgument(value ssa.Value, exported bool) llvm.Value {
+	paramType := b.getLLVMType(value.Type())
+	if b.isIndirectParam(paramType, exported) {
+		return b.getValuePointer(value)
+	}
+	return b.getValue(value, getPos(value))
+}
+
+func (b *builder) createIndirectStorage(typ llvm.Type, name string) llvm.Value {
+	// Use runtime.alloc here so storage that escapes remains valid. The
+	// allocation optimizer moves bounded non-escaping storage to the stack.
+	size := llvm.ConstInt(b.uintptrType, b.targetData.TypeAllocSize(typ), false)
+	layout := b.createObjectLayout(typ, b.fn.Pos())
+	ptr := b.createAlloc(size, layout, b.targetData.ABITypeAlignment(typ), name)
+	if b.NeedsStackObjects {
+		b.trackPointer(ptr)
+	}
+	return ptr
+}
+
+func (b *builder) copyIndirectAggregate(dst, src llvm.Value, typ llvm.Type) {
+	size := llvm.ConstInt(b.uintptrType, b.targetData.TypeAllocSize(typ), false)
+	b.createMemCopy("memcpy", dst, src, size)
+}
+
+func (b *builder) storeValue(dst llvm.Value, value ssa.Value) {
+	typ := b.getLLVMType(value.Type())
+	if src, ok := b.indirectValues[value]; ok {
+		b.copyIndirectAggregate(dst, src, typ)
+	} else {
+		b.CreateStore(b.getValue(value, getPos(value)), dst)
+	}
+}
+
+func (b *builder) copyToIndirectStorage(src llvm.Value, typ llvm.Type, name string) llvm.Value {
+	dst := b.createIndirectStorage(typ, name)
+	b.copyIndirectAggregate(dst, src, typ)
+	return dst
+}
+
+func (b *builder) loadFromStorage(ptr llvm.Value, typ types.Type, name string) llvm.Value {
+	llvmType := b.getLLVMType(typ)
+	if b.isIndirectAggregate(llvmType) {
+		return b.copyToIndirectStorage(ptr, llvmType, name)
+	}
+	return b.CreateLoad(llvmType, ptr, name)
+}
+
+func (b *builder) getValueField(value ssa.Value, index int, resultType types.Type, name string) (llvm.Value, bool) {
+	if !b.isAggregateValue(value.Type()) {
+		return llvm.Value{}, false
+	}
+	valueType := b.getLLVMType(value.Type())
+	if _, indirect := b.indirectValues[value]; !indirect && !b.isIndirectAggregate(valueType) {
+		return llvm.Value{}, false
+	}
+	fieldPtr := b.CreateStructGEP(valueType, b.getValuePointer(value), index, "")
+	return b.loadFromStorage(fieldPtr, resultType, name), true
+}
+
+func (b *builder) zeroIndirectStorage(ptr llvm.Value, typ llvm.Type) {
+	memset := b.getMemsetFunc()
+	b.createCall(memset.GlobalValueType(), memset, []llvm.Value{
+		ptr,
+		llvm.ConstInt(b.ctx.Int8Type(), 0, false),
+		llvm.ConstInt(b.uintptrType, b.targetData.TypeAllocSize(typ), false),
+		llvm.ConstInt(b.ctx.Int1Type(), 0, false),
+	}, "")
+}
+
+type valueStorage struct {
+	ptr, size llvm.Value
+	temporary bool
+}
+
+func (b *builder) getValueStorage(value ssa.Value, name string) valueStorage {
+	typ := b.getLLVMType(value.Type())
+	if b.isIndirectAggregate(typ) {
+		return valueStorage{ptr: b.getValuePointer(value)}
+	}
+	ptr, size := b.createTemporaryAlloca(typ, name)
+	b.storeValue(ptr, value)
+	return valueStorage{ptr: ptr, size: size, temporary: true}
+}
+
+func (b *builder) endValueStorage(storage valueStorage) {
+	if storage.temporary {
+		b.emitLifetimeEnd(storage.ptr, storage.size)
+	}
+}
+
+type runtimeValueResult struct {
+	valueType  llvm.Type
+	resultType llvm.Type
+	result     llvm.Value
+	valuePtr   llvm.Value
+	valueSize  llvm.Value
+	temporary  bool
+	zero       bool
+	commaOk    bool
+}
+
+func (b *builder) createRuntimeValueResult(valueType llvm.Type, commaOk, zeroAsNull bool, name string) runtimeValueResult {
+	result := runtimeValueResult{
+		valueType:  valueType,
+		resultType: valueType,
+		valueSize:  llvm.ConstInt(b.uintptrType, b.targetData.TypeAllocSize(valueType), false),
+		commaOk:    commaOk,
+	}
+	if commaOk {
+		result.resultType = b.ctx.StructType([]llvm.Type{valueType, b.ctx.Int1Type()}, false)
+	}
+	if b.isIndirectAggregate(result.resultType) {
+		result.result = b.createIndirectStorage(result.resultType, name+".result")
+		result.valuePtr = result.result
+		if commaOk {
+			result.valuePtr = b.CreateStructGEP(result.resultType, result.result, 0, "")
+		}
+		return result
+	}
+	if zeroAsNull && b.targetData.TypeAllocSize(valueType) == 0 {
+		result.valuePtr = llvm.ConstNull(b.dataPtrType)
+		result.zero = true
+		return result
+	}
+	result.valuePtr, result.valueSize = b.createTemporaryAlloca(valueType, name+".value")
+	result.temporary = true
+	return result
+}
+
+func (r runtimeValueResult) finish(b *builder, commaOk llvm.Value, name string) llvm.Value {
+	if !r.result.IsNil() {
+		if r.commaOk {
+			b.CreateStore(commaOk, b.CreateStructGEP(r.resultType, r.result, 1, ""))
+		}
+		return r.result
+	}
+
+	var value llvm.Value
+	if r.zero {
+		value = llvm.ConstNull(r.valueType)
+	} else {
+		value = b.CreateLoad(r.valueType, r.valuePtr, name)
+	}
+	if r.temporary {
+		b.emitLifetimeEnd(r.valuePtr, r.valueSize)
+	}
+	if !r.commaOk {
+		return value
+	}
+	result := llvm.Undef(r.resultType)
+	result = b.CreateInsertValue(result, value, 0, "")
+	return b.CreateInsertValue(result, commaOk, 1, "")
+}
+
 // createBuiltin lowers a builtin Go function (append, close, delete, etc.) to
 // LLVM IR. It uses runtime calls for some builtins.
 func (b *builder) createBuiltin(argTypes []types.Type, argValues []llvm.Value, callName string, pos token.Pos) (llvm.Value, error) {
@@ -1549,7 +1845,8 @@ func (b *builder) createBuiltin(argTypes []types.Type, argValues []llvm.Value, c
 		elemsLen := b.CreateExtractValue(elems, 1, "append.elemsLen")
 		elemType := b.getLLVMType(argTypes[0].Underlying().(*types.Slice).Elem())
 		elemSize := llvm.ConstInt(b.uintptrType, b.targetData.TypeAllocSize(elemType), false)
-		result := b.createRuntimeCall("sliceAppend", []llvm.Value{srcBuf, elemsBuf, srcLen, srcCap, elemsLen, elemSize}, "append.new")
+		elemLayout := b.createObjectLayout(elemType, pos)
+		result := b.createRuntimeCall("sliceAppend", []llvm.Value{srcBuf, elemsBuf, srcLen, srcCap, elemsLen, elemSize, elemLayout}, "append.new")
 		newPtr := b.CreateExtractValue(result, 0, "append.newPtr")
 		newLen := b.CreateExtractValue(result, 1, "append.newLen")
 		newCap := b.CreateExtractValue(result, 2, "append.newCap")
@@ -1631,13 +1928,41 @@ func (b *builder) createBuiltin(argTypes []types.Type, argValues []llvm.Value, c
 	case "copy":
 		dst := argValues[0]
 		src := argValues[1]
+		// Fetch the lengths.
 		dstLen := b.CreateExtractValue(dst, 1, "copy.dstLen")
 		srcLen := b.CreateExtractValue(src, 1, "copy.srcLen")
-		dstBuf := b.CreateExtractValue(dst, 0, "copy.dstArray")
-		srcBuf := b.CreateExtractValue(src, 0, "copy.srcArray")
+		// Find the minimum of the lengths.
+		minFuncName := "llvm.umin.i" + strconv.Itoa(b.uintptrType.IntTypeWidth())
+		minFunc := b.mod.NamedFunction(minFuncName)
+		if minFunc.IsNil() {
+			fnType := llvm.FunctionType(b.uintptrType, []llvm.Type{b.uintptrType, b.uintptrType}, false)
+			minFunc = llvm.AddFunction(b.mod, minFuncName, fnType)
+		}
+		minLen := b.CreateCall(minFunc.GlobalValueType(), minFunc, []llvm.Value{dstLen, srcLen}, "copy.n")
+		// Multiply the length by the element size.
 		elemType := b.getLLVMType(argTypes[0].Underlying().(*types.Slice).Elem())
 		elemSize := llvm.ConstInt(b.uintptrType, b.targetData.TypeAllocSize(elemType), false)
-		return b.createRuntimeCall("sliceCopy", []llvm.Value{dstBuf, srcBuf, dstLen, srcLen, elemSize}, "copy.n"), nil
+		// NOTE: This is also NSW when uintptr is int, but we can only choose one through the C API?
+		size := b.CreateNUWMul(minLen, elemSize, "copy.size")
+		// Fetch the pointers.
+		dstBuf := b.CreateExtractValue(dst, 0, "copy.dstPtr")
+		srcBuf := b.CreateExtractValue(src, 0, "copy.srcPtr")
+		// Create a memcpy.
+		call := b.createMemCopy("memmove", dstBuf, srcBuf, size)
+		align := b.targetData.ABITypeAlignment(elemType)
+		if align > 1 {
+			// Apply the type's alignment to the arguments.
+			// LLVM sometimes turns constant-length moves into loads and stores.
+			// It may use this alignment for the created loads and stores.
+			alignAttr := b.ctx.CreateEnumAttribute(llvm.AttributeKindID("align"), uint64(align))
+			call.AddCallSiteAttribute(1, alignAttr)
+			call.AddCallSiteAttribute(2, alignAttr)
+		}
+		// Extend and return the copied length.
+		if b.targetData.TypeAllocSize(minLen.Type()) < b.targetData.TypeAllocSize(b.intType) {
+			minLen = b.CreateZExt(minLen, b.intType, "copy.n.zext")
+		}
+		return minLen, nil
 	case "delete":
 		m := argValues[0]
 		key := argValues[1]
@@ -1665,20 +1990,66 @@ func (b *builder) createBuiltin(argTypes []types.Type, argValues []llvm.Value, c
 		return llvmLen, nil
 	case "min", "max":
 		// min and max builtins, added in Go 1.21.
-		// We can simply reuse the existing binop comparison code, which has all
-		// the edge cases figured out already.
-		tok := token.LSS
-		if callName == "max" {
-			tok = token.GTR
-		}
-		result := argValues[0]
-		typ := argTypes[0]
-		for _, arg := range argValues[1:] {
-			cmp, err := b.createBinOp(tok, typ, typ, result, arg, pos)
-			if err != nil {
-				return result, err
+		// Find the corresponding intrinsic name.
+		ty := argTypes[0].Underlying().(*types.Basic)
+		llvmType := b.getLLVMType(ty)
+		info := ty.Info()
+		var prefix, delimeter, typeName string
+		if info&types.IsInteger != 0 {
+			// This is an integer value.
+			// Use the LLVM int min/max intrinsics.
+			prefix = "llvm.s"
+			if info&types.IsUnsigned != 0 {
+				prefix = "llvm.u"
 			}
-			result = b.CreateSelect(cmp, result, arg, "")
+			delimeter = ".i"
+			typeName = strconv.Itoa(llvmType.IntTypeWidth())
+		} else {
+			switch ty.Kind() {
+			case types.String:
+				// Strings do not have an equivalent intrinsic.
+				// Implement with compares and selects.
+				tok := token.LSS
+				if callName == "max" {
+					tok = token.GTR
+				}
+				result := argValues[0]
+				typ := argTypes[0]
+				for _, arg := range argValues[1:] {
+					cmp, err := b.createBinOp(tok, typ, typ, result, arg, pos)
+					if err != nil {
+						return result, err
+					}
+					result = b.CreateSelect(cmp, result, arg, "")
+				}
+				return result, nil
+			case types.Float32:
+				typeName = "f32"
+			case types.Float64:
+				typeName = "f64"
+			default:
+				return llvm.Value{}, b.makeError(pos, "todo: min/max: unknown type")
+			}
+			// There are a few edge cases with floating point min/max:
+			// min(-0.0, +0.0) = -0.0
+			// min(NaN, number) = NaN
+			// The llvm.minimum.*/llvm.maximum.* intrinsics match this behavior.
+			// Neither Go nor LLVM defines the bit representation of resulting NaNs.
+			prefix = "llvm."
+			delimeter = "imum."
+		}
+		intrinsicName := prefix + callName + delimeter + typeName
+		// Find or create the intrinsic.
+		llvmFn := b.mod.NamedFunction(intrinsicName)
+		if llvmFn.IsNil() {
+			fnType := llvm.FunctionType(llvmType, []llvm.Type{llvmType, llvmType}, false)
+			llvmFn = llvm.AddFunction(b.mod, intrinsicName, fnType)
+		}
+		// Call the intrinsic repeatedly to merge the arguments.
+		callType := llvmFn.GlobalValueType()
+		result := argValues[0]
+		for _, arg := range argValues[1:] {
+			result = b.CreateCall(callType, llvmFn, []llvm.Value{result, arg}, "")
 		}
 		return result, nil
 	case "panic":
@@ -1759,6 +2130,12 @@ func (b *builder) createBuiltin(argTypes []types.Type, argValues []llvm.Value, c
 			// not of the current function.
 			useParentFrame = 1
 		}
+		// Prevent inlining of functions that call recover(), matching the
+		// Go compiler's behavior. If this function were inlined into a
+		// deferred function, recover() would incorrectly succeed because
+		// the inlined code runs in the deferred function's context.
+		noinline := b.ctx.CreateEnumAttribute(llvm.AttributeKindID("noinline"), 0)
+		b.llvmFn.AddFunctionAttr(noinline)
 		return b.createRuntimeCall("_recover", []llvm.Value{llvm.ConstInt(b.ctx.Int1Type(), useParentFrame, false)}, ""), nil
 	case "ssa:wrapnilchk":
 		// TODO: do an actual nil check?
@@ -1835,19 +2212,11 @@ func (b *builder) createBuiltin(argTypes []types.Type, argValues []llvm.Value, c
 //
 // This is also where compiler intrinsics are implemented.
 func (b *builder) createFunctionCall(instr *ssa.CallCommon) (llvm.Value, error) {
-	var params []llvm.Value
-	for _, param := range instr.Args {
-		params = append(params, b.getValue(param, getPos(instr)))
-	}
-
-	// Try to call the function directly for trivially static calls.
-	var callee, context llvm.Value
-	var calleeType llvm.Type
-	exported := false
+	// See if this is an intrinsic function that is handled specially.
 	if fn := instr.StaticCallee(); fn != nil {
 		// Direct function call, either to a named or anonymous (directly
 		// applied) function call. If it is anonymous, it may be a closure.
-		name := fn.RelString(nil)
+		name := b.getFunctionInfo(fn).linkName
 		switch {
 		case name == "device.Asm" || name == "device/arm.Asm" || name == "device/arm64.Asm" || name == "device/avr.Asm" || name == "device/riscv.Asm":
 			return b.createInlineAsm(instr.Args)
@@ -1859,10 +2228,14 @@ func (b *builder) createFunctionCall(instr *ssa.CallCommon) (llvm.Value, error)
 			return b.emitSV64Call(instr.Args, getPos(instr))
 		case strings.HasPrefix(name, "(device/riscv.CSR)."):
 			return b.emitCSROperation(instr)
-		case strings.HasPrefix(name, "syscall.Syscall") || strings.HasPrefix(name, "syscall.RawSyscall") || strings.HasPrefix(name, "golang.org/x/sys/unix.Syscall") || strings.HasPrefix(name, "golang.org/x/sys/unix.RawSyscall"):
+		case (strings.HasPrefix(name, "syscall.Syscall") || strings.HasPrefix(name, "syscall.RawSyscall") || strings.HasPrefix(name, "golang.org/x/sys/unix.Syscall") || strings.HasPrefix(name, "golang.org/x/sys/unix.RawSyscall")) && name != "syscall.SyscallN":
 			if b.GOOS != "darwin" {
 				return b.createSyscall(instr)
 			}
+		case name == "syscall.syscalln":
+			if b.GOOS == "windows" {
+				return b.createSyscalln(instr)
+			}
 		case strings.HasPrefix(name, "syscall.rawSyscallNoError") || strings.HasPrefix(name, "golang.org/x/sys/unix.RawSyscallNoError"):
 			return b.createRawSyscallNoError(instr)
 		case name == "runtime.supportsRecover":
@@ -1879,13 +2252,25 @@ func (b *builder) createFunctionCall(instr *ssa.CallCommon) (llvm.Value, error)
 			return llvm.ConstInt(b.ctx.Int8Type(), panicStrategy, false), nil
 		case name == "runtime/interrupt.New":
 			return b.createInterruptGlobal(instr)
+		case name == "runtime.exportedFuncPtr":
+			_, ptr := b.getFunction(instr.Args[0].(*ssa.Function))
+			return b.CreatePtrToInt(ptr, b.uintptrType, ""), nil
+		case name == "(*runtime/interrupt.Checkpoint).Save":
+			return b.createInterruptCheckpoint(instr.Args[0]), nil
 		case name == "internal/abi.FuncPCABI0":
 			retval := b.createDarwinFuncPCABI0Call(instr)
 			if !retval.IsNil() {
 				return retval, nil
 			}
 		}
+	}

+	// Try to call the function directly for trivially static calls.
+	var callee, context llvm.Value
+	var calleeType llvm.Type
+	var invokeTypecode, invokeReceiver llvm.Value
+	exported := false
+	if fn := instr.StaticCallee(); fn != nil {
 		calleeType, callee = b.getFunction(fn)
 		info := b.getFunctionInfo(fn)
 		if callee.IsNil() {
@@ -1913,19 +2298,18 @@ func (b *builder) createFunctionCall(instr *ssa.CallCommon) (llvm.Value, error)
 		exported = info.exported
 	} else if call, ok := instr.Value.(*ssa.Builtin); ok {
 		// Builtin function (append, close, delete, etc.).)
+		var params []llvm.Value
 		var argTypes []types.Type
 		for _, arg := range instr.Args {
 			argTypes = append(argTypes, arg.Type())
+			params = append(params, b.getValue(arg, getPos(instr)))
 		}
 		return b.createBuiltin(argTypes, params, call.Name(), instr.Pos())
 	} else if instr.IsInvoke() {
 		// Interface method call (aka invoke call).
 		itf := b.getValue(instr.Value, getPos(instr)) // interface value (runtime._interface)
-		typecode := b.CreateExtractValue(itf, 0, "invoke.func.typecode")
-		value := b.CreateExtractValue(itf, 1, "invoke.func.value") // receiver
-		// Prefix the params with receiver value and suffix with typecode.
-		params = append([]llvm.Value{value}, params...)
-		params = append(params, typecode)
+		invokeTypecode = b.CreateExtractValue(itf, 0, "invoke.func.typecode")
+		invokeReceiver = b.CreateExtractValue(itf, 1, "invoke.func.value")
 		callee = b.getInvokeFunction(instr)
 		calleeType = callee.GlobalValueType()
 		context = llvm.Undef(b.dataPtrType)
@@ -1939,7 +2323,23 @@ func (b *builder) createFunctionCall(instr *ssa.CallCommon) (llvm.Value, error)
 		b.createNilCheck(instr.Value, callee, "fpcall")
 	}

+	var params []llvm.Value
+	for _, param := range instr.Args {
+		params = append(params, b.getCallArgument(param, exported))
+	}
+	if instr.IsInvoke() {
+		params = append([]llvm.Value{invokeReceiver}, params...)
+		params = append(params, invokeTypecode)
+	}
+
 	if !exported {
+		if resultType, indirectResult := b.hasIndirectResult(instr.Signature()); indirectResult {
+			result := b.createIndirectStorage(resultType, "call.result")
+			params = append([]llvm.Value{result}, params...)
+			params = append(params, context)
+			b.createInvoke(calleeType, callee, params, "")
+			return result, nil
+		}
 		// This function takes a context parameter.
 		// Add it to the end of the parameter list.
 		params = append(params, context)
@@ -1978,6 +2378,9 @@ func (b *builder) getValue(expr ssa.Value, pos token.Pos) llvm.Value {
 		return value
 	default:
 		// other (local) SSA value
+		if value, ok := b.indirectValues[expr]; ok {
+			return b.CreateLoad(b.getLLVMType(expr.Type()), value, "")
+		}
 		if value, ok := b.locals[expr]; ok {
 			return value
 		} else {
@@ -2002,13 +2405,10 @@ func (c *compilerContext) maxSliceSize(elementType llvm.Type) uint64 {
 	if elementSize == 0 {
 		elementSize = 1
 	}
-	maxSize := maxPointerValue / elementSize
-
-	// len(slice) is an int. Make sure the length remains small enough to fit in
-	// an int.
-	if maxSize > maxIntegerValue {
-		maxSize = maxIntegerValue
-	}
+	maxSize := min(
+		// len(slice) is an int. Make sure the length remains small enough to fit in
+		// an int.
+		maxPointerValue/elementSize, maxIntegerValue)

 	return maxSize
 }
@@ -2035,9 +2435,8 @@ func (b *builder) createExpr(expr ssa.Value) (llvm.Value, error) {
 			}
 			sizeValue := llvm.ConstInt(b.uintptrType, size, false)
 			layoutValue := b.createObjectLayout(typ, expr.Pos())
-			buf := b.createRuntimeCall("alloc", []llvm.Value{sizeValue, layoutValue}, expr.Comment)
 			align := b.targetData.ABITypeAlignment(typ)
-			buf.AddCallSiteAttribute(0, b.ctx.CreateEnumAttribute(llvm.AttributeKindID("align"), uint64(align)))
+			buf := b.createAlloc(sizeValue, layoutValue, align, expr.Comment)
 			return buf, nil
 		} else {
 			buf := llvmutil.CreateEntryBlockAlloca(b.Builder, typ, expr.Comment)
@@ -2064,8 +2463,15 @@ func (b *builder) createExpr(expr ssa.Value) (llvm.Value, error) {
 		// This instruction changes the type, but the underlying value remains
 		// the same. This is often a no-op, but sometimes we have to change the
 		// LLVM type as well.
-		x := b.getValue(expr.X, getPos(expr))
 		llvmType := b.getLLVMType(expr.Type())
+		if b.isIndirectAggregate(llvmType) {
+			sourceType := b.getLLVMType(expr.X.Type())
+			if !b.isIndirectAggregate(sourceType) || b.targetData.TypeAllocSize(sourceType) != b.targetData.TypeAllocSize(llvmType) {
+				return llvm.Value{}, errors.New("todo: indirect aggregate ChangeType with different layout")
+			}
+			return b.getValuePointer(expr.X), nil
+		}
+		x := b.getValue(expr.X, getPos(expr))
 		if x.Type() == llvmType {
 			// Different Go type but same LLVM type (for example, named int).
 			// This is the common case.
@@ -2095,9 +2501,15 @@ func (b *builder) createExpr(expr ssa.Value) (llvm.Value, error) {
 		if _, ok := expr.Tuple.(*ssa.Select); ok {
 			return b.getChanSelectResult(expr), nil
 		}
+		if value, ok := b.getValueField(expr.Tuple, expr.Index, expr.Type(), expr.Name()); ok {
+			return value, nil
+		}
 		value := b.getValue(expr.Tuple, getPos(expr))
 		return b.CreateExtractValue(value, expr.Index, ""), nil
 	case *ssa.Field:
+		if value, ok := b.getValueField(expr.X, expr.Field, expr.Type(), expr.Name()); ok {
+			return value, nil
+		}
 		value := b.getValue(expr.X, getPos(expr))
 		result := b.CreateExtractValue(value, expr.Field, "")
 		return result, nil
@@ -2120,11 +2532,11 @@ func (b *builder) createExpr(expr ssa.Value) (llvm.Value, error) {
 	case *ssa.Global:
 		panic("global is not an expression")
 	case *ssa.Index:
-		collection := b.getValue(expr.X, getPos(expr))
 		index := b.getValue(expr.Index, getPos(expr))

 		switch xType := expr.X.Type().Underlying().(type) {
 		case *types.Basic: // extract byte from string
+			collection := b.getValue(expr.X, getPos(expr))
 			// Value type must be a string, which is a basic type.
 			if xType.Info()&types.IsString == 0 {
 				panic("lookup on non-string?")
@@ -2158,13 +2570,12 @@ func (b *builder) createExpr(expr ssa.Value) (llvm.Value, error) {

 			// Can't load directly from array (as index is non-constant), so
 			// have to do it using an alloca+gep+load.
-			arrayType := collection.Type()
-			alloca, allocaSize := b.createTemporaryAlloca(arrayType, "index.alloca")
-			b.CreateStore(collection, alloca)
+			arrayType := b.getLLVMType(expr.X.Type())
+			storage := b.getValueStorage(expr.X, "index.alloca")
 			zero := llvm.ConstInt(b.ctx.Int32Type(), 0, false)
-			ptr := b.CreateInBoundsGEP(arrayType, alloca, []llvm.Value{zero, index}, "index.gep")
-			result := b.CreateLoad(arrayType.ElementType(), ptr, "index.load")
-			b.emitLifetimeEnd(alloca, allocaSize)
+			ptr := b.CreateInBoundsGEP(arrayType, storage.ptr, []llvm.Value{zero, index}, "index.gep")
+			result := b.loadFromStorage(ptr, expr.Type(), "index.load")
+			b.endValueStorage(storage)
 			return result, nil
 		default:
 			panic("unknown *ssa.Index type")
@@ -2223,17 +2634,21 @@ func (b *builder) createExpr(expr ssa.Value) (llvm.Value, error) {
 		}
 	case *ssa.Lookup: // map lookup
 		value := b.getValue(expr.X, getPos(expr))
-		index := b.getValue(expr.Index, getPos(expr))
 		valueType := expr.Type()
 		if expr.CommaOk {
 			valueType = valueType.(*types.Tuple).At(0).Type()
 		}
-		return b.createMapLookup(expr.X.Type().Underlying().(*types.Map).Key(), valueType, value, index, expr.CommaOk, expr.Pos())
+		return b.createMapLookup(expr.X.Type().Underlying().(*types.Map).Key(), valueType, value, expr.Index, expr.CommaOk, expr.Pos())
 	case *ssa.MakeChan:
 		return b.createMakeChan(expr), nil
 	case *ssa.MakeClosure:
 		return b.parseMakeClosure(expr)
 	case *ssa.MakeInterface:
+		if b.isOversizedAggregate(expr.X.Type()) {
+			typ := b.getLLVMType(expr.X.Type())
+			ptr := b.copyToIndirectStorage(b.getValuePointer(expr.X), typ, "interface.value")
+			return b.createMakeInterfaceFromPointer(ptr, expr.X.Type()), nil
+		}
 		val := b.getValue(expr.X, getPos(expr))
 		return b.createMakeInterface(val, expr.X.Type(), expr.Pos()), nil
 	case *ssa.MakeMap:
@@ -2267,8 +2682,7 @@ func (b *builder) createExpr(expr ssa.Value) (llvm.Value, error) {
 		}
 		sliceSize := b.CreateBinOp(llvm.Mul, elemSizeValue, sliceCapCast, "makeslice.cap")
 		layoutValue := b.createObjectLayout(llvmElemType, expr.Pos())
-		slicePtr := b.createRuntimeCall("alloc", []llvm.Value{sliceSize, layoutValue}, "makeslice.buf")
-		slicePtr.AddCallSiteAttribute(0, b.ctx.CreateEnumAttribute(llvm.AttributeKindID("align"), uint64(elemAlign)))
+		slicePtr := b.createAlloc(sliceSize, layoutValue, elemAlign, "makeslice.buf")

 		// Extend or truncate if necessary. This is safe as we've already done
 		// the bounds check.
@@ -2301,7 +2715,8 @@ func (b *builder) createExpr(expr ssa.Value) (llvm.Value, error) {
 			return b.createMapIteratorNext(rangeVal, llvmRangeVal, it), nil
 		}
 	case *ssa.Phi:
-		phi := b.CreatePHI(b.getLLVMType(expr.Type()), "")
+		phiType := b.storedParamType(b.getLLVMType(expr.Type()), false)
+		phi := b.CreatePHI(phiType, "")
 		b.phis = append(b.phis, phiNode{expr, phi})
 		return phi, nil
 	case *ssa.Range:
@@ -3304,8 +3719,7 @@ func (b *builder) createUnOp(unop *ssa.UnOp) (llvm.Value, error) {
 			return fn, nil
 		} else {
 			b.createNilCheck(unop.X, x, "deref")
-			load := b.CreateLoad(valueType, x, "")
-			return load, nil
+			return b.loadFromStorage(x, unop.Type(), ""), nil
 		}
 	case token.XOR: // ^x, toggle all bits in integer
 		return b.CreateXor(x, llvm.ConstInt(x.Type(), ^uint64(0), false), ""), nil
@@ -4,6 +4,7 @@ import (
 	"flag"
 	"go/types"
 	"os"
+	"regexp"
 	"strconv"
 	"strings"
 	"testing"
@@ -50,6 +51,8 @@ func TestCompiler(t *testing.T) {
 		{"channel.go", "", ""},
 		{"gc.go", "", ""},
 		{"zeromap.go", "", ""},
+		{"generics.go", "", ""},
+		{"large.go", "", ""},
 	}
 	if goMinor >= 20 {
 		tests = append(tests, testCase{"go1.20.go", "", ""})
@@ -57,6 +60,9 @@ func TestCompiler(t *testing.T) {
 	if goMinor >= 21 {
 		tests = append(tests, testCase{"go1.21.go", "", ""})
 	}
+	if goMinor >= 27 {
+		tests = append(tests, testCase{"go1.27.go", "", ""})
+	}

 	for _, tc := range tests {
 		name := tc.file
@@ -121,30 +127,138 @@ func TestCompiler(t *testing.T) {
 				t.Fatal("failed to read golden file:", err)
 			}

-			if !fuzzyEqualIR(mod.String(), string(expected)) {
-				t.Errorf("output does not match expected output:\n%s", mod.String())
+			if diff := diffIR(string(expected), mod.String()); diff != "" {
+				t.Errorf("output does not match expected output (re-run with -update to regenerate):\n%s", diff)
 			}
 		})
 	}
 }

-// fuzzyEqualIR returns true if the two LLVM IR strings passed in are roughly
-// equal. That means, only relevant lines are compared (excluding comments
-// etc.).
-func fuzzyEqualIR(s1, s2 string) bool {
-	lines1 := filterIrrelevantIRLines(strings.Split(s1, "\n"))
-	lines2 := filterIrrelevantIRLines(strings.Split(s2, "\n"))
-	if len(lines1) != len(lines2) {
-		return false
-	}
-	for i, line1 := range lines1 {
-		line2 := lines2[i]
-		if line1 != line2 {
-			return false
+func TestOptimizedLargeAggregateABI(t *testing.T) {
+	options := &compileopts.Options{Target: "wasm"}
+	mod, errs := testCompilePackage(t, options, "large-optimized.go")
+	if len(errs) != 0 {
+		for _, err := range errs {
+			t.Error(err)
 		}
+		return
+	}
+	defer mod.Dispose()
+
+	passOptions := llvm.NewPassBuilderOptions()
+	defer passOptions.Dispose()
+	if err := mod.RunPasses("default<O2>", llvm.TargetMachine{}, passOptions); err != nil {
+		t.Fatal(err)
 	}

-	return true
+	resultFn := mod.NamedFunction("main.makeLargeOptimizedValue")
+	if resultFn.IsNil() {
+		t.Fatal("missing function main.makeLargeOptimizedValue")
+	}
+	if resultType := resultFn.GlobalValueType().ReturnType(); resultType.TypeKind() != llvm.VoidTypeKind {
+		t.Errorf("large aggregate result was promoted to %s", resultType)
+	}
+
+	for _, name := range []string{
+		"main.makeLargeOptimizedValue",
+		"main.readLargeOptimizedValue",
+		"main.readMixedLargeOptimizedValue",
+	} {
+		fn := mod.NamedFunction(name)
+		if fn.IsNil() {
+			t.Fatalf("missing function %s", name)
+		}
+		if paramType := fn.GlobalValueType().ParamTypes()[0]; paramType.TypeKind() != llvm.PointerTypeKind {
+			t.Errorf("%s aggregate parameter was promoted to %s", name, paramType)
+		}
+	}
+}
+
+// normalizeIR canonicalizes LLVM IR so a single golden file keeps matching
+// across LLVM versions. Golden files are written against LLVM <21; newer LLVM
+// prints some attributes differently.
+func normalizeIR(s string) string {
+	// Golden files are written using the pre-LLVM21 'nocapture' spelling,
+	// which LLVM printed before any co-occurring attribute such as
+	// 'readonly' (e.g. "ptr nocapture readonly"). LLVM 21+ prints the
+	// equivalent 'captures(none)' instead, and after such attributes (e.g.
+	// "ptr readonly captures(none)"). Normalize both name and position back
+	// to the old spelling.
+	s = normalizeCapturesAttr(s)
+
+	// LLVM 21+ also added an explicit 'nocreateundeforpoison' attribute to
+	// certain intrinsic declarations (e.g. llvm.umin) that were implicitly
+	// assumed not to create undef/poison before. It's unrelated to the
+	// behavior under test, so ignore it for comparison.
+	s = strings.ReplaceAll(s, "nocreateundeforpoison ", "")
+
+	// LLVM 22 dropped the (redundant) i64 size argument from
+	// llvm.lifetime.start/end. Normalize away that argument so golden files
+	// written against the two-argument form still match.
+	s = lifetimeSizeArgRe.ReplaceAllString(s, "$1")
+
+	return s
+}
+
+// diffIR compares two LLVM IR strings, ignoring irrelevant lines (comments,
+// empty lines, etc.) and normalizing LLVM-version-specific spellings via
+// normalizeIR. It returns "" when they are equal. Otherwise it returns a
+// compact diff of only the region that differs: the common prefix and suffix
+// are trimmed, then the differing expected lines (prefixed "-") are shown
+// followed by the differing actual lines (prefixed "+").
+func diffIR(expected, actual string) string {
+	exp := filterIrrelevantIRLines(strings.Split(normalizeIR(expected), "\n"))
+	act := filterIrrelevantIRLines(strings.Split(normalizeIR(actual), "\n"))
+
+	// Trim the common prefix.
+	start := 0
+	for start < len(exp) && start < len(act) && exp[start] == act[start] {
+		start++
+	}
+	// Trim the common suffix.
+	e, a := len(exp), len(act)
+	for e > start && a > start && exp[e-1] == act[a-1] {
+		e--
+		a--
+	}
+	if start == e && start == a {
+		return "" // equal
+	}
+
+	var b strings.Builder
+	b.WriteString("first difference at relevant line ")
+	b.WriteString(strconv.Itoa(start + 1))
+	b.WriteString(":\n")
+	for _, line := range exp[start:e] {
+		b.WriteString("- ")
+		b.WriteString(line)
+		b.WriteByte('\n')
+	}
+	for _, line := range act[start:a] {
+		b.WriteString("+ ")
+		b.WriteString(line)
+		b.WriteByte('\n')
+	}
+	return b.String()
+}
+
+// capturesNoneAttrRe matches a co-occurring attribute directly followed by
+// 'captures(none)', which is how LLVM 21+ orders these two attributes when
+// printing IR (the pre-LLVM21 'nocapture' attribute printed the other way
+// around).
+var capturesNoneAttrRe = regexp.MustCompile(`\b(readonly|readnone|writeonly|nonnull)\s+captures\(none\)`)
+
+// lifetimeSizeArgRe matches the i64 size argument of an
+// llvm.lifetime.start/end call or declaration, which LLVM 22 removed.
+var lifetimeSizeArgRe = regexp.MustCompile(`(@llvm\.lifetime\.(?:start|end)\.p0\()i64(?: immarg| \d+), `)
+
+// normalizeCapturesAttr rewrites LLVM 21+'s 'captures(none)' attribute back
+// to the pre-LLVM21 'nocapture' spelling and position, so golden IR files
+// written against LLVM <21 keep matching.
+func normalizeCapturesAttr(s string) string {
+	s = capturesNoneAttrRe.ReplaceAllString(s, "nocapture $1")
+	s = strings.ReplaceAll(s, "captures(none)", "nocapture")
+	return s
 }

 // filterIrrelevantIRLines removes lines from the input slice of strings that
@@ -187,9 +301,9 @@ func TestCompilerErrors(t *testing.T) {
 		t.Error(err)
 	}
 	errorsFileString := strings.ReplaceAll(string(errorsFile), "\r\n", "\n")
-	for _, line := range strings.Split(errorsFileString, "\n") {
-		if strings.HasPrefix(line, "// ERROR: ") {
-			expectedErrors = append(expectedErrors, strings.TrimPrefix(line, "// ERROR: "))
+	for line := range strings.SplitSeq(errorsFileString, "\n") {
+		if after, ok := strings.CutPrefix(line, "// ERROR: "); ok {
+			expectedErrors = append(expectedErrors, after)
 		}
 	}

@@ -213,6 +327,49 @@ func TestCompilerErrors(t *testing.T) {
 	}
 }

+func TestAggregateValueCount(t *testing.T) {
+	t.Parallel()
+
+	ctx := llvm.NewContext()
+	defer ctx.Dispose()
+
+	byteType := ctx.Int8Type()
+	tests := []struct {
+		name     string
+		typ      llvm.Type
+		count    uint64
+		exceeded bool
+	}{
+		{"empty", llvm.ArrayType(byteType, 0), 0, false},
+		{"limit", llvm.ArrayType(byteType, 1024), 1024, false},
+		{"over limit", llvm.ArrayType(byteType, 1025), 0, true},
+		{"combined limit", ctx.StructType([]llvm.Type{
+			llvm.ArrayType(byteType, 512),
+			llvm.ArrayType(byteType, 512),
+		}, false), 1024, false},
+		{"combined over limit", ctx.StructType([]llvm.Type{
+			llvm.ArrayType(byteType, 1000),
+			llvm.ArrayType(byteType, 1000),
+		}, false), 0, true},
+		{"comma-ok over limit", ctx.StructType([]llvm.Type{
+			llvm.ArrayType(byteType, 1024),
+			ctx.Int1Type(),
+		}, false), 0, true},
+	}
+
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			count, exceeded := aggregateValueCount(test.typ, 0)
+			if exceeded != test.exceeded {
+				t.Errorf("expected exceeded=%t, got %t", test.exceeded, exceeded)
+			}
+			if !exceeded && count != test.count {
+				t.Errorf("expected count=%d, got %d", test.count, count)
+			}
+		})
+	}
+}
+
 // Build a package given a number of compiler options and a file.
 func testCompilePackage(t *testing.T, options *compileopts.Options, file string) (llvm.Module, []error) {
 	target, err := compileopts.LoadTarget(options)
@@ -32,7 +32,7 @@ func (b *builder) supportsRecover() bool {
 		// proposal of WebAssembly:
 		// https://github.com/WebAssembly/exception-handling
 		return false
-	case "riscv64", "xtensa":
+	case "xtensa":
 		// TODO: add support for these architectures
 		return false
 	default:
@@ -60,10 +60,6 @@ func (b *builder) deferInitFunc() {
 	b.deferExprFuncs = make(map[ssa.Value]int)
 	b.deferBuiltinFuncs = make(map[ssa.Value]deferBuiltin)

-	// Create defer list pointer.
-	b.deferPtr = b.CreateAlloca(b.dataPtrType, "deferPtr")
-	b.CreateStore(llvm.ConstPointerNull(b.dataPtrType), b.deferPtr)
-
 	if b.hasDeferFrame() {
 		// Set up the defer frame with the current stack pointer.
 		// This assumes that the stack pointer doesn't move outside of the
@@ -73,12 +69,22 @@ func (b *builder) deferInitFunc() {
 		// in the setjmp-like inline assembly.
 		deferFrameType := b.getLLVMRuntimeType("deferFrame")
 		b.deferFrame = b.CreateAlloca(deferFrameType, "deferframe.buf")
+		// The field index must match the DeferPtr field in runtime.deferFrame,
+		// defined in src/runtime/panic.go.
+		b.deferPtr = b.CreateInBoundsGEP(deferFrameType, b.deferFrame, []llvm.Value{
+			llvm.ConstInt(b.ctx.Int32Type(), 0, false),
+			llvm.ConstInt(b.ctx.Int32Type(), 6, false), // DeferPtr field
+		}, "deferPtr")
 		stackPointer := b.readStackPointer()
 		b.createRuntimeCall("setupDeferFrame", []llvm.Value{b.deferFrame, stackPointer}, "")

 		// Create the landing pad block, which is where control transfers after
 		// a panic.
 		b.landingpad = b.ctx.AddBasicBlock(b.llvmFn, "lpad")
+	} else {
+		// Create defer list pointer.
+		b.deferPtr = b.CreateAlloca(b.dataPtrType, "deferPtr")
+		b.CreateStore(llvm.ConstPointerNull(b.dataPtrType), b.deferPtr)
 	}
 }

@@ -100,17 +106,18 @@ func (b *builder) createLandingPad() {

 	// Continue at the 'recover' block, which returns to the parent in an
 	// appropriate way.
-	b.CreateBr(b.blockEntries[b.fn.Recover])
+	b.CreateBr(b.blockInfo[b.fn.Recover.Index].entry)
 }

-// createInvokeCheckpoint saves the function state at the given point, to
-// continue at the landing pad if a panic happened. This is implemented using a
-// setjmp-like construct.
-func (b *builder) createInvokeCheckpoint() {
+// Create a checkpoint (similar to setjmp). This emits inline assembly that
+// stores the current program counter inside the ptr address (actually
+// ptr+sizeof(ptr)) and then returns a boolean indicating whether this is the
+// normal flow (false) or we jumped here from somewhere else (true).
+func (b *builder) createCheckpoint(ptr llvm.Value) llvm.Value {
 	// Construct inline assembly equivalents of setjmp.
 	// The assembly works as follows:
-	//   * All registers (both callee-saved and caller saved) are clobbered
-	//     after the inline assembly returns.
+	//   * Registers are either clobbered or, on 386, saved for longjmp to
+	//     restore if the ABI requires them to survive calls.
 	//   * The assembly stores the address just past the end of the assembly
 	//     into the jump buffer.
 	//   * The return value (eax, rax, r0, etc) is set to zero in the inline
@@ -123,8 +130,12 @@ func (b *builder) createInvokeCheckpoint() {
 		asmString = `
 xorl %eax, %eax
 movl $$1f, 4(%ebx)
+movl %ebx, 8(%ebx)
+movl %esi, 12(%ebx)
+movl %edi, 16(%ebx)
+movl %ebp, 20(%ebx)
 1:`
-		constraints = "={eax},{ebx},~{ebx},~{ecx},~{edx},~{esi},~{edi},~{ebp},~{xmm0},~{xmm1},~{xmm2},~{xmm3},~{xmm4},~{xmm5},~{xmm6},~{xmm7},~{fpsr},~{fpcr},~{flags},~{dirflag},~{memory}"
+		constraints = "={eax},{ebx},~{ecx},~{edx},~{xmm0},~{xmm1},~{xmm2},~{xmm3},~{xmm4},~{xmm5},~{xmm6},~{xmm7},~{fpsr},~{fpcr},~{flags},~{dirflag},~{memory}"
 		// This doesn't include the floating point stack because TinyGo uses
 		// newer floating point instructions.
 	case "x86_64":
@@ -206,60 +217,192 @@ sw $$ra, 4($$5)
 			// So only add them when using hardfloat.
 			constraints += ",~{$f0},~{$f1},~{$f2},~{$f3},~{$f4},~{$f5},~{$f6},~{$f7},~{$f8},~{$f9},~{$f10},~{$f11},~{$f12},~{$f13},~{$f14},~{$f15},~{$f16},~{$f17},~{$f18},~{$f19},~{$f20},~{$f21},~{$f22},~{$f23},~{$f24},~{$f25},~{$f26},~{$f27},~{$f28},~{$f29},~{$f30},~{$f31}"
 		}
-	case "riscv32":
-		asmString = `
+	case "riscv32", "riscv64":
+		if b.archFamily() == "riscv32" {
+			asmString = `
 la a2, 1f
 sw a2, 4(a1)
 li a0, 0
 1:`
+		} else {
+			asmString = `
+la a2, 1f
+sd a2, 8(a1)
+li a0, 0
+1:`
+		}
 		constraints = "={a0},{a1},~{a1},~{a2},~{a3},~{a4},~{a5},~{a6},~{a7},~{s0},~{s1},~{s2},~{s3},~{s4},~{s5},~{s6},~{s7},~{s8},~{s9},~{s10},~{s11},~{t0},~{t1},~{t2},~{t3},~{t4},~{t5},~{t6},~{ra},~{f0},~{f1},~{f2},~{f3},~{f4},~{f5},~{f6},~{f7},~{f8},~{f9},~{f10},~{f11},~{f12},~{f13},~{f14},~{f15},~{f16},~{f17},~{f18},~{f19},~{f20},~{f21},~{f22},~{f23},~{f24},~{f25},~{f26},~{f27},~{f28},~{f29},~{f30},~{f31},~{memory}"
 	default:
 		// This case should have been handled by b.supportsRecover().
 		b.addError(b.fn.Pos(), "unknown architecture for defer: "+b.archFamily())
 	}
-	asmType := llvm.FunctionType(resultType, []llvm.Type{b.deferFrame.Type()}, false)
+	asmType := llvm.FunctionType(resultType, []llvm.Type{b.dataPtrType}, false)
 	asm := llvm.InlineAsm(asmType, asmString, constraints, false, false, 0, false)
-	result := b.CreateCall(asmType, asm, []llvm.Value{b.deferFrame}, "setjmp")
+	result := b.CreateCall(asmType, asm, []llvm.Value{ptr}, "setjmp")
 	result.AddCallSiteAttribute(-1, b.ctx.CreateEnumAttribute(llvm.AttributeKindID("returns_twice"), 0))
 	isZero := b.CreateICmp(llvm.IntEQ, result, llvm.ConstInt(resultType, 0, false), "setjmp.result")
+	return isZero
+}
+
+// createInvokeCheckpoint saves the function state at the given point, to
+// continue at the landing pad if a panic happened. This is implemented using a
+// setjmp-like construct.
+func (b *builder) createInvokeCheckpoint() {
+	isZero := b.createCheckpoint(b.deferFrame)
 	continueBB := b.insertBasicBlock("")
 	b.CreateCondBr(isZero, continueBB, b.landingpad)
 	b.SetInsertPointAtEnd(continueBB)
-	b.blockExits[b.currentBlock] = continueBB
+	b.currentBlockInfo.exit = continueBB
 }

-// isInLoop checks if there is a path from a basic block to itself.
-func isInLoop(start *ssa.BasicBlock) bool {
-	// Use a breadth-first search to scan backwards through the block graph.
-	queue := []*ssa.BasicBlock{start}
-	checked := map[*ssa.BasicBlock]struct{}{}
+// createFaultCheckpoint is like createInvokeCheckpoint but for use in fault
+// blocks (e.g., bounds check failures). Unlike createInvokeCheckpoint, it does
+// not update currentBlockInfo.exit because the fault block is a dead-end that
+// does not participate in phi node resolution.
+func (b *builder) createFaultCheckpoint() {
+	isZero := b.createCheckpoint(b.deferFrame)
+	continueBB := b.insertBasicBlock("")
+	b.CreateCondBr(isZero, continueBB, b.landingpad)
+	b.SetInsertPointAtEnd(continueBB)
+}

-	for len(queue) > 0 {
-		// pop a block off of the queue
-		block := queue[len(queue)-1]
-		queue = queue[:len(queue)-1]
+// isInLoop checks if there is a path from the current block to itself.
+// Use Tarjan's strongly connected components algorithm to search for cycles.
+// A one-node SCC is a cycle iff there is an edge from the node to itself.
+// A multi-node SCC is always a cycle.
+// https://en.wikipedia.org/wiki/Tarjan%27s_strongly_connected_components_algorithm
+func (b *builder) isInLoop() bool {
+	if b.currentBlockInfo.tarjan.lowLink == 0 {
+		b.strongConnect(b.currentBlock)
+	}
+	return b.currentBlockInfo.tarjan.cyclic
+}

-		// Search through predecessors.
-		// Searching backwards means that this is pretty fast when the block is close to the start of the function.
-		// Defers are often placed near the start of the function.
-		for _, pred := range block.Preds {
-			if pred == start {
-				// cycle found
-				return true
-			}
+func (b *builder) strongConnect(block *ssa.BasicBlock) {
+	// Assign a new index.
+	// Indices start from 1 so that 0 can be used as a sentinel.
+	assignedIndex := b.tarjanIndex + 1
+	b.tarjanIndex = assignedIndex

-			if _, ok := checked[pred]; ok {
-				// block already checked
-				continue
-			}
+	// Apply the new index.
+	blockIndex := block.Index
+	node := &b.blockInfo[blockIndex].tarjan
+	node.lowLink = assignedIndex

-			// add to queue and checked map
-			queue = append(queue, pred)
-			checked[pred] = struct{}{}
+	// Push the node onto the stack.
+	node.onStack = true
+	b.tarjanStack = append(b.tarjanStack, uint(blockIndex))
+
+	// Process the successors.
+	for _, successor := range block.Succs {
+		// Look up the successor's state.
+		successorIndex := successor.Index
+		if successorIndex == blockIndex {
+			// Handle a self-cycle specially.
+			node.cyclic = true
+			continue
+		}
+		successorNode := &b.blockInfo[successorIndex].tarjan
+
+		switch {
+		case successorNode.lowLink == 0:
+			// This node has not yet been visisted.
+			b.strongConnect(successor)
+
+		case !successorNode.onStack:
+			// This node has been visited, but is in a different SCC.
+			// Ignore it, and do not update lowLink.
+			continue
+		}
+
+		// Update the lowLink index.
+		// This always uses the min-of-lowlink instead of using index in the on-stack case.
+		// This is done for two reasons:
+		// 1. The lowLink update can be shared between the new-node and on-stack cases.
+		// 2. The assigned index does not need to be saved - it is only needed for root node detection.
+		if successorNode.lowLink < node.lowLink {
+			node.lowLink = successorNode.lowLink
 		}
 	}

-	return false
+	if node.lowLink == assignedIndex {
+		// This is a root node.
+		// Pop the SCC off the stack.
+		stack := b.tarjanStack
+		top := stack[len(stack)-1]
+		stack = stack[:len(stack)-1]
+		blocks := b.blockInfo
+		topNode := &blocks[top].tarjan
+		topNode.onStack = false
+
+		if top != uint(blockIndex) {
+			// The root node is not the only node in the SCC.
+			// Mark all nodes in this SCC as cyclic.
+			topNode.cyclic = true
+			for top != uint(blockIndex) {
+				top = stack[len(stack)-1]
+				stack = stack[:len(stack)-1]
+				topNode = &blocks[top].tarjan
+				topNode.onStack = false
+				topNode.cyclic = true
+			}
+		}
+
+		b.tarjanStack = stack
+	}
+}
+
+// tarjanNode holds per-block state for isInLoop and strongConnect.
+type tarjanNode struct {
+	// lowLink is the index of the first visited node that is reachable from this block.
+	// The lowLink indices are assigned by the SCC search, and do not correspond to b.Index.
+	// A lowLink of 0 is used as a sentinel to mark a node which has not yet been visited.
+	lowLink uint
+
+	// onStack tracks whether this node is currently on the SCC search stack.
+	onStack bool
+
+	// cyclic indicates whether this block is in a loop.
+	// If lowLink is 0, strongConnect must be called before reading this field.
+	cyclic bool
+}
+
+type llvmValueList struct {
+	values []llvm.Value
+	types  []llvm.Type
+}
+
+func newLLVMValueList(values ...llvm.Value) llvmValueList {
+	var list llvmValueList
+	list.append(values...)
+	return list
+}
+
+func (l *llvmValueList) append(values ...llvm.Value) {
+	for _, value := range values {
+		l.values = append(l.values, value)
+		l.types = append(l.types, value.Type())
+	}
+}
+
+func (l *llvmValueList) appendSSAValues(values []ssa.Value, lower func(ssa.Value) llvm.Value) {
+	for _, value := range values {
+		l.append(lower(value))
+	}
+}
+
+func (b *builder) loadDeferredCallParams(structType llvm.Type, ptr llvm.Value) []llvm.Value {
+	fieldTypes := structType.StructElementTypes()
+	values := make([]llvm.Value, 0, len(fieldTypes)-2)
+	zero := llvm.ConstInt(b.ctx.Int32Type(), 0, false)
+	for i := 2; i < len(fieldTypes); i++ {
+		fieldPtr := b.CreateInBoundsGEP(structType, ptr, []llvm.Value{
+			zero,
+			llvm.ConstInt(b.ctx.Int32Type(), uint64(i), false),
+		}, "gep")
+		values = append(values, b.CreateLoad(fieldTypes[i], fieldPtr, "param"))
+	}
+	return values
 }

 // createDefer emits a single defer instruction, to be run when this function
@@ -269,31 +412,28 @@ func (b *builder) createDefer(instr *ssa.Defer) {
 	// make a linked list.
 	next := b.CreateLoad(b.dataPtrType, b.deferPtr, "defer.next")

-	var values []llvm.Value
-	valueTypes := []llvm.Type{b.uintptrType, next.Type()}
+	var values llvmValueList
+	lowerArgument := func(value ssa.Value) llvm.Value {
+		return b.getCallArgument(value, false)
+	}
 	if instr.Call.IsInvoke() {
 		// Method call on an interface.

 		// Get callback type number.
-		methodName := instr.Call.Method.FullName()
-		if _, ok := b.deferInvokeFuncs[methodName]; !ok {
-			b.deferInvokeFuncs[methodName] = len(b.allDeferFuncs)
+		key := b.getInvokeFunctionName(&instr.Call)
+		if _, ok := b.deferInvokeFuncs[key]; !ok {
+			b.deferInvokeFuncs[key] = len(b.allDeferFuncs)
 			b.allDeferFuncs = append(b.allDeferFuncs, &instr.Call)
 		}
-		callback := llvm.ConstInt(b.uintptrType, uint64(b.deferInvokeFuncs[methodName]), false)
+		callback := llvm.ConstInt(b.uintptrType, uint64(b.deferInvokeFuncs[key]), false)

 		// Collect all values to be put in the struct (starting with
 		// runtime._defer fields, followed by the call parameters).
 		itf := b.getValue(instr.Call.Value, getPos(instr)) // interface
 		typecode := b.CreateExtractValue(itf, 0, "invoke.func.typecode")
 		receiverValue := b.CreateExtractValue(itf, 1, "invoke.func.receiver")
-		values = []llvm.Value{callback, next, typecode, receiverValue}
-		valueTypes = append(valueTypes, b.dataPtrType, b.dataPtrType)
-		for _, arg := range instr.Call.Args {
-			val := b.getValue(arg, getPos(instr))
-			values = append(values, val)
-			valueTypes = append(valueTypes, val.Type())
-		}
+		values = newLLVMValueList(callback, next, typecode, receiverValue)
+		values.appendSSAValues(instr.Call.Args, lowerArgument)

 	} else if callee, ok := instr.Call.Value.(*ssa.Function); ok {
 		// Regular function call.
@@ -305,12 +445,11 @@ func (b *builder) createDefer(instr *ssa.Defer) {

 		// Collect all values to be put in the struct (starting with
 		// runtime._defer fields).
-		values = []llvm.Value{callback, next}
-		for _, param := range instr.Call.Args {
-			llvmParam := b.getValue(param, getPos(instr))
-			values = append(values, llvmParam)
-			valueTypes = append(valueTypes, llvmParam.Type())
-		}
+		values = newLLVMValueList(callback, next)
+		exported := b.getFunctionInfo(callee).exported
+		values.appendSSAValues(instr.Call.Args, func(value ssa.Value) llvm.Value {
+			return b.getCallArgument(value, exported)
+		})

 	} else if makeClosure, ok := instr.Call.Value.(*ssa.MakeClosure); ok {
 		// Immediately applied function literal with free variables.
@@ -333,14 +472,9 @@ func (b *builder) createDefer(instr *ssa.Defer) {
 		// Collect all values to be put in the struct (starting with
 		// runtime._defer fields, followed by all parameters including the
 		// context pointer).
-		values = []llvm.Value{callback, next}
-		for _, param := range instr.Call.Args {
-			llvmParam := b.getValue(param, getPos(instr))
-			values = append(values, llvmParam)
-			valueTypes = append(valueTypes, llvmParam.Type())
-		}
-		values = append(values, context)
-		valueTypes = append(valueTypes, context.Type())
+		values = newLLVMValueList(callback, next)
+		values.appendSSAValues(instr.Call.Args, lowerArgument)
+		values.append(context)

 	} else if builtin, ok := instr.Call.Value.(*ssa.Builtin); ok {
 		var argTypes []types.Type
@@ -363,11 +497,8 @@ func (b *builder) createDefer(instr *ssa.Defer) {

 		// Collect all values to be put in the struct (starting with
 		// runtime._defer fields).
-		values = []llvm.Value{callback, next}
-		for _, param := range argValues {
-			values = append(values, param)
-			valueTypes = append(valueTypes, param.Type())
-		}
+		values = newLLVMValueList(callback, next)
+		values.append(argValues...)

 	} else {
 		funcValue := b.getValue(instr.Call.Value, getPos(instr))
@@ -382,34 +513,33 @@ func (b *builder) createDefer(instr *ssa.Defer) {
 		// Collect all values to be put in the struct (starting with
 		// runtime._defer fields, followed by all parameters including the
 		// context pointer).
-		values = []llvm.Value{callback, next, funcValue}
-		valueTypes = append(valueTypes, funcValue.Type())
-		for _, param := range instr.Call.Args {
-			llvmParam := b.getValue(param, getPos(instr))
-			values = append(values, llvmParam)
-			valueTypes = append(valueTypes, llvmParam.Type())
-		}
+		values = newLLVMValueList(callback, next, funcValue)
+		values.appendSSAValues(instr.Call.Args, lowerArgument)
 	}

 	// Make a struct out of the collected values to put in the deferred call
 	// struct.
-	deferredCallType := b.ctx.StructType(valueTypes, false)
+	deferredCallType := b.ctx.StructType(values.types, false)
 	deferredCall := llvm.ConstNull(deferredCallType)
-	for i, value := range values {
+	for i, value := range values.values {
 		deferredCall = b.CreateInsertValue(deferredCall, value, i, "")
 	}

 	// Put this struct in an allocation.
 	var alloca llvm.Value
-	if !isInLoop(instr.Block()) {
+	if instr.Block() != b.currentBlock {
+		panic("block mismatch")
+	}
+	if !b.isInLoop() {
 		// This can safely use a stack allocation.
 		alloca = llvmutil.CreateEntryBlockAlloca(b.Builder, deferredCallType, "defer.alloca")
 	} else {
 		// This may be hit a variable number of times, so use a heap allocation.
 		size := b.targetData.TypeAllocSize(deferredCallType)
 		sizeValue := llvm.ConstInt(b.uintptrType, size, false)
-		nilPtr := llvm.ConstNull(b.dataPtrType)
-		alloca = b.createRuntimeCall("alloc", []llvm.Value{sizeValue, nilPtr}, "defer.alloc.call")
+		layoutValue := b.createObjectLayout(deferredCallType, instr.Pos())
+		align := b.targetData.ABITypeAlignment(deferredCallType)
+		alloca = b.createAlloc(sizeValue, layoutValue, align, "defer.alloc.call")
 	}
 	if b.NeedsStackObjects {
 		b.trackPointer(alloca)
@@ -493,19 +623,11 @@ func (b *builder) createRunDefers() {
 				valueTypes = append(valueTypes, b.dataPtrType, b.dataPtrType)
 			}

-			for _, arg := range callback.Args {
-				valueTypes = append(valueTypes, b.getLLVMType(arg.Type()))
-			}
+			valueTypes = b.appendStoredValueTypes(valueTypes, callback.Args, false)

 			// Extract the params from the struct (including receiver).
-			forwardParams := []llvm.Value{}
-			zero := llvm.ConstInt(b.ctx.Int32Type(), 0, false)
 			deferredCallType := b.ctx.StructType(valueTypes, false)
-			for i := 2; i < len(valueTypes); i++ {
-				gep := b.CreateInBoundsGEP(deferredCallType, deferData, []llvm.Value{zero, llvm.ConstInt(b.ctx.Int32Type(), uint64(i), false)}, "gep")
-				forwardParam := b.CreateLoad(valueTypes[i], gep, "param")
-				forwardParams = append(forwardParams, forwardParam)
-			}
+			forwardParams := b.loadDeferredCallParams(deferredCallType, deferData)

 			var fnPtr llvm.Value
 			var fnType llvm.Type
@@ -534,6 +656,7 @@ func (b *builder) createRunDefers() {
 				// with a strict calling convention.
 				forwardParams = append(forwardParams, llvm.Undef(b.dataPtrType))
 			}
+			forwardParams = b.prependIndirectResult(callback.Signature(), false, forwardParams, "defer.result")

 			b.createCall(fnType, fnPtr, forwardParams, "")

@@ -542,27 +665,21 @@ func (b *builder) createRunDefers() {

 			// Get the real defer struct type and cast to it.
 			valueTypes := []llvm.Type{b.uintptrType, b.dataPtrType}
-			for _, param := range getParams(callback.Signature) {
-				valueTypes = append(valueTypes, b.getLLVMType(param.Type()))
-			}
+			exported := b.getFunctionInfo(callback).exported
+			valueTypes = b.appendStoredParamTypes(valueTypes, getParams(callback.Signature), exported)
 			deferredCallType := b.ctx.StructType(valueTypes, false)

 			// Extract the params from the struct.
-			forwardParams := []llvm.Value{}
-			zero := llvm.ConstInt(b.ctx.Int32Type(), 0, false)
-			for i := range getParams(callback.Signature) {
-				gep := b.CreateInBoundsGEP(deferredCallType, deferData, []llvm.Value{zero, llvm.ConstInt(b.ctx.Int32Type(), uint64(i+2), false)}, "gep")
-				forwardParam := b.CreateLoad(valueTypes[i+2], gep, "param")
-				forwardParams = append(forwardParams, forwardParam)
-			}
+			forwardParams := b.loadDeferredCallParams(deferredCallType, deferData)

 			// Plain TinyGo functions add some extra parameters to implement async functionality and function receivers.
 			// These parameters should not be supplied when calling into an external C/ASM function.
-			if !b.getFunctionInfo(callback).exported {
+			if !exported {
 				// Add the context parameter. We know it is ignored by the receiving
 				// function, but we have to pass one anyway.
 				forwardParams = append(forwardParams, llvm.Undef(b.dataPtrType))
 			}
+			forwardParams = b.prependIndirectResult(callback.Signature, exported, forwardParams, "defer.result")

 			// Call real function.
 			fnType, fn := b.getFunction(callback)
@@ -572,24 +689,16 @@ func (b *builder) createRunDefers() {
 			// Get the real defer struct type and cast to it.
 			fn := callback.Fn.(*ssa.Function)
 			valueTypes := []llvm.Type{b.uintptrType, b.dataPtrType}
-			params := fn.Signature.Params()
-			for i := 0; i < params.Len(); i++ {
-				valueTypes = append(valueTypes, b.getLLVMType(params.At(i).Type()))
-			}
+			valueTypes = b.appendStoredParamTypes(valueTypes, getParams(fn.Signature), false)
 			valueTypes = append(valueTypes, b.dataPtrType) // closure
 			deferredCallType := b.ctx.StructType(valueTypes, false)

 			// Extract the params from the struct.
-			forwardParams := []llvm.Value{}
-			zero := llvm.ConstInt(b.ctx.Int32Type(), 0, false)
-			for i := 2; i < len(valueTypes); i++ {
-				gep := b.CreateInBoundsGEP(deferredCallType, deferData, []llvm.Value{zero, llvm.ConstInt(b.ctx.Int32Type(), uint64(i), false)}, "")
-				forwardParam := b.CreateLoad(valueTypes[i], gep, "param")
-				forwardParams = append(forwardParams, forwardParam)
-			}
+			forwardParams := b.loadDeferredCallParams(deferredCallType, deferData)

 			// Call deferred function.
 			fnType, llvmFn := b.getFunction(fn)
+			forwardParams = b.prependIndirectResult(fn.Signature, false, forwardParams, "defer.result")
 			b.createCall(fnType, llvmFn, forwardParams, "")
 		case *ssa.Builtin:
 			db := b.deferBuiltinFuncs[callback]
@@ -599,20 +708,14 @@ func (b *builder) createRunDefers() {

 			//Get signature from call results
 			params := callback.Type().Underlying().(*types.Signature).Params()
-			for i := 0; i < params.Len(); i++ {
-				valueTypes = append(valueTypes, b.getLLVMType(params.At(i).Type()))
+			for v := range params.Variables() {
+				valueTypes = append(valueTypes, b.getLLVMType(v.Type()))
 			}

 			deferredCallType := b.ctx.StructType(valueTypes, false)

 			// Extract the params from the struct.
-			var argValues []llvm.Value
-			zero := llvm.ConstInt(b.ctx.Int32Type(), 0, false)
-			for i := 0; i < params.Len(); i++ {
-				gep := b.CreateInBoundsGEP(deferredCallType, deferData, []llvm.Value{zero, llvm.ConstInt(b.ctx.Int32Type(), uint64(i+2), false)}, "gep")
-				forwardParam := b.CreateLoad(valueTypes[i+2], gep, "param")
-				argValues = append(argValues, forwardParam)
-			}
+			argValues := b.loadDeferredCallParams(deferredCallType, deferData)

 			_, err := b.createBuiltin(db.argTypes, argValues, db.callName, db.pos)
 			if err != nil {
@@ -10,6 +10,91 @@ import (
 	"tinygo.org/x/go-llvm"
 )

+// LLVM recursively expands each struct field and array element in parameters
+// and results into separate values. It gets very slow with too many values, so
+// pass larger aggregates indirectly before LLVM expands them.
+const maxDirectAggregateValues = 1024
+
+func (c *compilerContext) getLLVMResultType(sig *types.Signature) llvm.Type {
+	switch sig.Results().Len() {
+	case 0:
+		return c.ctx.VoidType()
+	case 1:
+		return c.getLLVMType(sig.Results().At(0).Type())
+	default:
+		results := make([]llvm.Type, sig.Results().Len())
+		for i := range results {
+			results[i] = c.getLLVMType(sig.Results().At(i).Type())
+		}
+		return c.ctx.StructType(results, false)
+	}
+}
+
+func (c *compilerContext) hasIndirectResult(sig *types.Signature) (llvm.Type, bool) {
+	resultType := c.getLLVMResultType(sig)
+	return resultType, c.isIndirectAggregate(resultType)
+}
+
+func (c *compilerContext) isIndirectAggregate(typ llvm.Type) bool {
+	switch typ.TypeKind() {
+	case llvm.ArrayTypeKind, llvm.StructTypeKind:
+		_, exceeded := aggregateValueCount(typ, 0)
+		return exceeded
+	default:
+		return false
+	}
+}
+
+func aggregateValueCount(typ llvm.Type, count uint64) (uint64, bool) {
+	switch typ.TypeKind() {
+	case llvm.ArrayTypeKind:
+		length := uint64(typ.ArrayLength())
+		if length == 0 {
+			return count, false
+		}
+		elementCount, exceeded := aggregateValueCount(typ.ElementType(), 0)
+		if exceeded {
+			return count, true
+		}
+		if elementCount != 0 && length > (maxDirectAggregateValues-count)/elementCount {
+			return count, true
+		}
+		return count + length*elementCount, false
+	case llvm.StructTypeKind:
+		for _, field := range typ.StructElementTypes() {
+			var exceeded bool
+			count, exceeded = aggregateValueCount(field, count)
+			if exceeded {
+				return count, true
+			}
+		}
+		return count, false
+	default:
+		count++
+		return count, count > maxDirectAggregateValues
+	}
+}
+
+func isLLVMValueType(typ types.Type) bool {
+	switch typ := typ.Underlying().(type) {
+	case *types.Basic:
+		return typ.Kind() != types.Invalid
+	case *types.Array:
+		return isLLVMValueType(typ.Elem())
+	case *types.Struct:
+		for field := range typ.Fields() {
+			if !isLLVMValueType(field.Type()) {
+				return false
+			}
+		}
+		return true
+	case *types.Chan, *types.Interface, *types.Map, *types.Pointer, *types.Signature, *types.Slice:
+		return true
+	default:
+		return false
+	}
+}
+
 // createFuncValue creates a function value from a raw function pointer with no
 // context.
 func (b *builder) createFuncValue(funcPtr, context llvm.Value, sig *types.Signature) llvm.Value {
@@ -48,28 +133,18 @@ func (c *compilerContext) getFuncType(typ *types.Signature) llvm.Type {

 // getLLVMFunctionType returns a LLVM function type for a given signature.
 func (c *compilerContext) getLLVMFunctionType(typ *types.Signature) llvm.Type {
-	// Get the return type.
-	var returnType llvm.Type
-	switch typ.Results().Len() {
-	case 0:
-		// No return values.
-		returnType = c.ctx.VoidType()
-	case 1:
-		// Just one return value.
-		returnType = c.getLLVMType(typ.Results().At(0).Type())
-	default:
-		// Multiple return values. Put them together in a struct.
-		// This appears to be the common way to handle multiple return values in
-		// LLVM.
-		members := make([]llvm.Type, typ.Results().Len())
-		for i := 0; i < typ.Results().Len(); i++ {
-			members[i] = c.getLLVMType(typ.Results().At(i).Type())
-		}
-		returnType = c.ctx.StructType(members, false)
-	}
+	returnType, indirectResult := c.hasIndirectResult(typ)

 	// Get the parameter types.
 	var paramTypes []llvm.Type
+	if indirectResult {
+		// LLVM expands aggregate returns into scalar leaves before deciding
+		// whether to pass them indirectly, so a large IR return can exhaust
+		// memory. Returning void avoids that expansion and cannot be demoted
+		// again. Keep the result pointer first so the context remains last.
+		paramTypes = append(paramTypes, c.dataPtrType)
+		returnType = c.ctx.VoidType()
+	}
 	if typ.Recv() != nil {
 		recv := c.getLLVMType(typ.Recv().Type())
 		if recv.StructName() == "runtime._interface" {
@@ -81,8 +156,8 @@ func (c *compilerContext) getLLVMFunctionType(typ *types.Signature) llvm.Type {
 			paramTypes = append(paramTypes, info.llvmType)
 		}
 	}
-	for i := 0; i < typ.Params().Len(); i++ {
-		subType := c.getLLVMType(typ.Params().At(i).Type())
+	for v := range typ.Params().Variables() {
+		subType := c.getLLVMType(v.Type())
 		for _, info := range c.expandFormalParamType(subType, "", nil) {
 			paramTypes = append(paramTypes, info.llvmType)
 		}
@@ -112,7 +187,7 @@ func (b *builder) parseMakeClosure(expr *ssa.MakeClosure) (llvm.Value, error) {

 	// Store the bound variables in a single object, allocating it on the heap
 	// if necessary.
-	context := b.emitPointerPack(boundVars)
+	context := b.emitPointerPack(boundVars, expr.Pos())

 	// Create the closure.
 	_, fn := b.getFunction(f)
@@ -5,11 +5,38 @@ package compiler

 import (
 	"go/token"
+	"slices"

 	"golang.org/x/tools/go/ssa"
 	"tinygo.org/x/go-llvm"
 )

+// Heap-allocate a buffer of the given size. This will typically call
+// runtime.alloc.
+func (b *builder) createAlloc(sizeValue, layoutValue llvm.Value, align int, comment string) llvm.Value {
+	// Normally allocate using "runtime.alloc", but use "runtime.alloc_noheap"
+	// if the //go:noheap pragma is used.
+	allocFunc := "alloc"
+	if b.info.noheap {
+		allocFunc = "alloc_noheap"
+	}
+
+	// Allocs that don't allocate anything can return an architecture-specific
+	// sentinel value.
+	if !sizeValue.IsAConstantInt().IsNil() && sizeValue.ZExtValue() == 0 {
+		allocFunc = "alloc_zero"
+	}
+
+	// Make the runtime call.
+	call := b.createRuntimeCall(allocFunc, []llvm.Value{sizeValue, layoutValue}, comment)
+	if align == 0 || align&(align-1) != 0 {
+		panic("invalid alignment")
+	}
+	call.AddCallSiteAttribute(0, b.ctx.CreateEnumAttribute(llvm.AttributeKindID("align"), uint64(align)))
+
+	return call
+}
+
 // trackExpr inserts pointer tracking intrinsics for the GC if the expression is
 // one of the expressions that need this.
 func (b *builder) trackExpr(expr ssa.Value, value llvm.Value) {
@@ -62,7 +89,7 @@ func (b *builder) trackValue(value llvm.Value) {
 			return
 		}
 		numElements := typ.StructElementTypesCount()
-		for i := 0; i < numElements; i++ {
+		for i := range numElements {
 			subValue := b.CreateExtractValue(value, i, "")
 			b.trackValue(subValue)
 		}
@@ -71,7 +98,7 @@ func (b *builder) trackValue(value llvm.Value) {
 			return
 		}
 		numElements := typ.ArrayLength()
-		for i := 0; i < numElements; i++ {
+		for i := range numElements {
 			subValue := b.CreateExtractValue(value, i, "")
 			b.trackValue(subValue)
 		}
@@ -92,13 +119,11 @@ func typeHasPointers(t llvm.Type) bool {
 	case llvm.PointerTypeKind:
 		return true
 	case llvm.StructTypeKind:
-		for _, subType := range t.StructElementTypes() {
-			if typeHasPointers(subType) {
-				return true
-			}
-		}
-		return false
+		return slices.ContainsFunc(t.StructElementTypes(), typeHasPointers)
 	case llvm.ArrayTypeKind:
+		if t.ArrayLength() == 0 {
+			return false
+		}
 		if typeHasPointers(t.ElementType()) {
 			return true
 		}
@@ -47,20 +47,16 @@ func (b *builder) createGo(instr *ssa.Go) {
 		return
 	}

-	// Get all function parameters to pass to the goroutine.
 	var params []llvm.Value
-	for _, param := range instr.Call.Args {
-		params = append(params, b.expandFormalParam(b.getValue(param, getPos(instr)))...)
-	}
-
 	var prefix string
 	var funcPtr llvm.Value
 	var funcType llvm.Type
+	var context llvm.Value
 	hasContext := false
+	exported := false
 	if callee := instr.Call.StaticCallee(); callee != nil {
 		// Static callee is known. This makes it easier to start a new
 		// goroutine.
-		var context llvm.Value
 		switch value := instr.Call.Value.(type) {
 		case *ssa.Function:
 			// Goroutine call is regular function call. No context is necessary.
@@ -73,10 +69,10 @@ func (b *builder) createGo(instr *ssa.Go) {
 			panic("StaticCallee returned an unexpected value")
 		}
 		if !context.IsNil() {
-			params = append(params, context) // context parameter
 			hasContext = true
 		}
 		funcType, funcPtr = b.getFunction(callee)
+		exported = b.getFunctionInfo(callee).exported
 	} else if instr.Call.IsInvoke() {
 		// This is a method call on an interface value.
 		itf := b.getValue(instr.Call.Value, getPos(instr))
@@ -84,23 +80,32 @@ func (b *builder) createGo(instr *ssa.Go) {
 		itfValue := b.CreateExtractValue(itf, 1, "")
 		funcPtr = b.getInvokeFunction(&instr.Call)
 		funcType = funcPtr.GlobalValueType()
-		params = append([]llvm.Value{itfValue}, params...) // start with receiver
-		params = append(params, itfTypeCode)               // end with typecode
+		params = append(params, itfValue)
+		context = itfTypeCode
 	} else {
 		// This is a function pointer.
 		// At the moment, two extra params are passed to the newly started
 		// goroutine:
 		//   * The function context, for closures.
 		//   * The function pointer (for tasks).
-		var context llvm.Value
 		funcPtr, context = b.decodeFuncValue(b.getValue(instr.Call.Value, getPos(instr)))
 		funcType = b.getLLVMFunctionType(instr.Call.Value.Type().Underlying().(*types.Signature))
-		params = append(params, context, funcPtr)
 		hasContext = true
-		prefix = b.fn.RelString(nil)
+		prefix = b.getFunctionInfo(b.fn).linkName
 	}

-	paramBundle := b.emitPointerPack(params)
+	for _, param := range instr.Call.Args {
+		params = append(params, b.getGoroutineCallArgument(param, exported)...)
+	}
+	if !context.IsNil() {
+		params = append(params, context)
+	}
+	if hasContext && instr.Call.StaticCallee() == nil {
+		params = append(params, funcPtr)
+	}
+	params = b.prependIndirectResult(instr.Call.Signature(), exported, params, "go.result")
+
+	paramBundle := b.emitPointerPack(params, instr.Pos())
 	var stackSize llvm.Value
 	callee := b.createGoroutineStartWrapper(funcType, funcPtr, prefix, hasContext, false, instr.Pos())
 	if b.AutomaticStackSize {
@@ -122,6 +127,15 @@ func (b *builder) createGo(instr *ssa.Go) {
 	b.createCall(fnType, start, []llvm.Value{callee, paramBundle, stackSize, llvm.Undef(b.dataPtrType)}, "")
 }

+func (b *builder) getGoroutineCallArgument(value ssa.Value, exported bool) []llvm.Value {
+	typ := b.getLLVMType(value.Type())
+	arg := b.getCallArgument(value, exported)
+	if b.isIndirectParam(typ, exported) {
+		return []llvm.Value{b.copyToIndirectStorage(arg, typ, "go.param")}
+	}
+	return b.expandFormalParam(arg)
+}
+
 // Create an exported wrapper function for functions with the //go:wasmexport
 // pragma. This wrapper function is quite complex when the scheduler is enabled:
 // it needs to start a new goroutine each time the exported function is called.
@@ -139,7 +153,7 @@ func (b *builder) createWasmExport() {
 	// Declare the exported function.
 	paramTypes := b.llvmFnType.ParamTypes()
 	exportedFnType := llvm.FunctionType(b.llvmFnType.ReturnType(), paramTypes[:len(paramTypes)-1], false)
-	exportedFn := llvm.AddFunction(b.mod, b.fn.RelString(nil)+suffix, exportedFnType)
+	exportedFn := llvm.AddFunction(b.mod, b.getFunctionInfo(b.fn).linkName+suffix, exportedFnType)
 	b.addStandardAttributes(exportedFn)
 	llvmutil.AppendToGlobal(b.mod, "llvm.used", exportedFn)
 	exportedFn.AddFunctionAttr(b.ctx.CreateStringAttribute("wasm-export-name", b.info.wasmExport))
@@ -414,7 +428,7 @@ func (c *compilerContext) createGoroutineStartWrapper(fnType llvm.Type, fn llvm.
 			// Extract parameters from the state object, and call the function
 			// that's being wrapped.
 			var callParams []llvm.Value
-			for i := 0; i < numParams; i++ {
+			for i := range numParams {
 				gep := b.CreateInBoundsGEP(stateStruct, statePtr, []llvm.Value{
 					llvm.ConstInt(b.ctx.Int32Type(), 0, false),
 					llvm.ConstInt(b.ctx.Int32Type(), uint64(i), false),
@@ -38,10 +38,10 @@ func (b *builder) createInlineAsm(args []ssa.Value) (llvm.Value, error) {
 // provided immediately. For example:
 //
 //	arm.AsmFull(
-//	    "str {value}, {result}",
+//	    "str {value}, [{result}]",
 //	    map[string]interface{}{
-//	        "value":  1
-//	        "result": &dest,
+//	        "value":  1,
+//	        "result": uintptr(unsafe.Pointer(&dest)),
 //	    })
 func (b *builder) createInlineAsmFull(instr *ssa.CallCommon) (llvm.Value, error) {
 	asmString := constant.StringVal(instr.Args[0].(*ssa.Const).Value)
@@ -146,13 +146,14 @@ func (b *builder) emitSVCall(args []ssa.Value, pos token.Pos) (llvm.Value, error
 	llvmArgs := []llvm.Value{}
 	argTypes := []llvm.Type{}
 	asm := "svc #" + strconv.FormatUint(num, 10)
-	constraints := "={r0}"
+	var constraints strings.Builder
+	constraints.WriteString("={r0}")
 	for i, arg := range args[1:] {
 		arg = arg.(*ssa.MakeInterface).X
 		if i == 0 {
-			constraints += ",0"
+			constraints.WriteString(",0")
 		} else {
-			constraints += ",{r" + strconv.Itoa(i) + "}"
+			constraints.WriteString(",{r" + strconv.Itoa(i) + "}")
 		}
 		llvmValue := b.getValue(arg, pos)
 		llvmArgs = append(llvmArgs, llvmValue)
@@ -161,9 +162,9 @@ func (b *builder) emitSVCall(args []ssa.Value, pos token.Pos) (llvm.Value, error
 	// Implement the ARM calling convention by marking r1-r3 as
 	// clobbered. r0 is used as an output register so doesn't have to be
 	// marked as clobbered.
-	constraints += ",~{r1},~{r2},~{r3}"
+	constraints.WriteString(",~{r1},~{r2},~{r3}")
 	fnType := llvm.FunctionType(b.uintptrType, argTypes, false)
-	target := llvm.InlineAsm(fnType, asm, constraints, true, false, 0, false)
+	target := llvm.InlineAsm(fnType, asm, constraints.String(), true, false, 0, false)
 	return b.CreateCall(fnType, target, llvmArgs, ""), nil
 }

@@ -184,13 +185,14 @@ func (b *builder) emitSV64Call(args []ssa.Value, pos token.Pos) (llvm.Value, err
 	llvmArgs := []llvm.Value{}
 	argTypes := []llvm.Type{}
 	asm := "svc #" + strconv.FormatUint(num, 10)
-	constraints := "={x0}"
+	var constraints strings.Builder
+	constraints.WriteString("={x0}")
 	for i, arg := range args[1:] {
 		arg = arg.(*ssa.MakeInterface).X
 		if i == 0 {
-			constraints += ",0"
+			constraints.WriteString(",0")
 		} else {
-			constraints += ",{x" + strconv.Itoa(i) + "}"
+			constraints.WriteString(",{x" + strconv.Itoa(i) + "}")
 		}
 		llvmValue := b.getValue(arg, pos)
 		llvmArgs = append(llvmArgs, llvmValue)
@@ -199,9 +201,9 @@ func (b *builder) emitSV64Call(args []ssa.Value, pos token.Pos) (llvm.Value, err
 	// Implement the ARM64 calling convention by marking x1-x7 as
 	// clobbered. x0 is used as an output register so doesn't have to be
 	// marked as clobbered.
-	constraints += ",~{x1},~{x2},~{x3},~{x4},~{x5},~{x6},~{x7}"
+	constraints.WriteString(",~{x1},~{x2},~{x3},~{x4},~{x5},~{x6},~{x7}")
 	fnType := llvm.FunctionType(b.uintptrType, argTypes, false)
-	target := llvm.InlineAsm(fnType, asm, constraints, true, false, 0, false)
+	target := llvm.InlineAsm(fnType, asm, constraints.String(), true, false, 0, false)
 	return b.CreateCall(fnType, target, llvmArgs, ""), nil
 }

@@ -249,3 +251,15 @@ func (b *builder) emitCSROperation(call *ssa.CallCommon) (llvm.Value, error) {
 		return llvm.Value{}, b.makeError(call.Pos(), "unknown CSR operation: "+name)
 	}
 }
+
+// Implement runtime/interrupt.Checkpoint.Save. It needs to be implemented
+// directly at the call site. If it isn't implemented directly at the call site
+// (but instead through a function call), it might result in an overwritten
+// stack in the non-jump return case.
+func (b *builder) createInterruptCheckpoint(ptr ssa.Value) llvm.Value {
+	addr := b.getValue(ptr, ptr.Pos())
+	b.createNilCheck(ptr, addr, "deref")
+	stackPointer := b.readStackPointer()
+	b.CreateStore(stackPointer, addr)
+	return b.createCheckpoint(addr)
+}
@@ -7,6 +7,7 @@ import (
 	"strconv"
 	"strings"

+	"github.com/tinygo-org/tinygo/compiler/llvmutil"
 	"tinygo.org/x/go-llvm"
 )

@@ -27,6 +28,8 @@ func (b *builder) defineIntrinsicFunction() {
 		b.createStackSaveImpl()
 	case name == "runtime.KeepAlive":
 		b.createKeepAliveImpl()
+	case name == "machine.keepAliveNoEscape":
+		b.createMachineKeepAliveImpl()
 	case strings.HasPrefix(name, "runtime/volatile.Load"):
 		b.createVolatileLoad()
 	case strings.HasPrefix(name, "runtime/volatile.Store"):
@@ -48,19 +51,24 @@ func (b *builder) defineIntrinsicFunction() {
 // and will otherwise be lowered to regular libc memcpy/memmove calls.
 func (b *builder) createMemoryCopyImpl() {
 	b.createFunctionStart(true)
-	fnName := "llvm." + b.fn.Name() + ".p0.p0.i" + strconv.Itoa(b.uintptrType.IntTypeWidth())
+	params := b.fn.Params[0:3]
+	b.createMemCopy(
+		b.fn.Name(),
+		b.getValue(params[0], getPos(b.fn)),
+		b.getValue(params[1], getPos(b.fn)),
+		b.getValue(params[2], getPos(b.fn)),
+	)
+	b.CreateRetVoid()
+}
+
+func (b *builder) createMemCopy(kind string, dst, src, len llvm.Value) llvm.Value {
+	fnName := "llvm." + kind + ".p0.p0.i" + strconv.Itoa(b.uintptrType.IntTypeWidth())
 	llvmFn := b.mod.NamedFunction(fnName)
 	if llvmFn.IsNil() {
 		fnType := llvm.FunctionType(b.ctx.VoidType(), []llvm.Type{b.dataPtrType, b.dataPtrType, b.uintptrType, b.ctx.Int1Type()}, false)
 		llvmFn = llvm.AddFunction(b.mod, fnName, fnType)
 	}
-	var params []llvm.Value
-	for _, param := range b.fn.Params {
-		params = append(params, b.getValue(param, getPos(b.fn)))
-	}
-	params = append(params, llvm.ConstInt(b.ctx.Int1Type(), 0, false))
-	b.CreateCall(llvmFn.GlobalValueType(), llvmFn, params, "")
-	b.CreateRetVoid()
+	return b.CreateCall(llvmFn.GlobalValueType(), llvmFn, []llvm.Value{dst, src, len, llvm.ConstInt(b.ctx.Int1Type(), 0, false)}, "")
 }

 // createMemoryZeroImpl creates calls to llvm.memset.* to zero a block of
@@ -121,13 +129,60 @@ func (b *builder) createKeepAliveImpl() {
 	b.CreateRetVoid()
 }

+// createAbiEscapeImpl implements the generic internal/abi.Escape function. It
+// currently only supports pointer types.
+func (b *builder) createAbiEscapeImpl() {
+	b.createFunctionStart(true)
+
+	// The first parameter is assumed to be a pointer. This is checked at the
+	// call site of createAbiEscapeImpl.
+	pointerValue := b.getValue(b.fn.Params[0], getPos(b.fn))
+
+	// Create an equivalent of the following C code, which is basically just a
+	// nop but ensures the pointerValue is kept alive:
+	//
+	//     __asm__ __volatile__("" : : "r"(pointerValue))
+	//
+	// It should be portable to basically everything as the "r" register type
+	// exists basically everywhere.
+	asmType := llvm.FunctionType(b.dataPtrType, []llvm.Type{b.dataPtrType}, false)
+	asmFn := llvm.InlineAsm(asmType, "", "=r,0", true, false, 0, false)
+	result := b.createCall(asmType, asmFn, []llvm.Value{pointerValue}, "")
+
+	b.CreateRet(result)
+}
+
+// Implement machine.keepAliveNoEscape, which makes sure the compiler keeps the
+// pointer parameter alive until this point (for GC).
+func (b *builder) createMachineKeepAliveImpl() {
+	b.createFunctionStart(true)
+	pointerValue := b.getValue(b.fn.Params[0], getPos(b.fn))
+
+	// See createKeepAliveImpl for details.
+	asmType := llvm.FunctionType(b.ctx.VoidType(), []llvm.Type{b.dataPtrType}, false)
+	asmFn := llvm.InlineAsm(asmType, "", "r", true, false, 0, false)
+	b.createCall(asmType, asmFn, []llvm.Value{pointerValue}, "")
+
+	b.CreateRetVoid()
+}
+
 var mathToLLVMMapping = map[string]string{
+	"math.Acos":  "llvm.acos.f64",
+	"math.Asin":  "llvm.asin.f64",
+	"math.Atan":  "llvm.atan.f64",
+	"math.Atan2": "llvm.atan2.f64",
 	"math.Ceil":  "llvm.ceil.f64",
+	"math.Cos":   "llvm.cos.f64",
+	"math.Cosh":  "llvm.cosh.f64",
 	"math.Exp":   "llvm.exp.f64",
 	"math.Exp2":  "llvm.exp2.f64",
 	"math.Floor": "llvm.floor.f64",
 	"math.Log":   "llvm.log.f64",
+	"math.Sin":   "llvm.sin.f64",
+	"math.Sinh":  "llvm.sinh.f64",
 	"math.Sqrt":  "llvm.sqrt.f64",
+	"math.Tan":   "llvm.tan.f64",
+	"math.Tanh":  "llvm.tanh.f64",
 	"math.Trunc": "llvm.trunc.f64",
 }

@@ -141,18 +196,40 @@ var mathToLLVMMapping = map[string]string{
 // float32(math.Sqrt(float64(v))) to a 32-bit floating point operation, which is
 // beneficial on architectures where 64-bit floating point operations are (much)
 // more expensive than 32-bit ones.
-func (b *builder) defineMathOp() {
-	b.createFunctionStart(true)
-	llvmName := mathToLLVMMapping[b.fn.RelString(nil)]
-	if llvmName == "" {
-		panic("unreachable: unknown math operation") // sanity check
+func (b *builder) defineMathOp() bool {
+	llvmName, ok := mathToLLVMMapping[b.fn.RelString(nil)]
+	if !ok {
+		return false
 	}
+	if strings.HasSuffix(b.Triple, "-wasi") || llvmutil.Version() < 19 {
+		// We don't have a real libc for wasip2. Until that is fixed, we need to
+		// limit math intrinsics on WASI to a subset supported natively in
+		// WebAssembly.
+		// Also, since we don't know the specific libc we will target, disallow
+		// these for all WASI targets.
+		//
+		// We also need to limit ourselves to LLVM 19 and above for the extended
+		// set of math intrinsics, see:
+		// https://discourse.llvm.org/t/rfc-all-the-math-intrinsics/78294
+		switch b.fn.Name() {
+		case "Ceil", "Exp", "Exp2", "Floor", "Log", "Sqrt", "Trunc":
+		default:
+			return false
+		}
+	}
+	b.createFunctionStart(true)
 	llvmFn := b.mod.NamedFunction(llvmName)
 	if llvmFn.IsNil() {
 		// The intrinsic doesn't exist yet, so declare it.
-		// At the moment, all supported intrinsics have the form "double
-		// foo(double %x)" so we can hardcode the signature here.
-		llvmType := llvm.FunctionType(b.ctx.DoubleType(), []llvm.Type{b.ctx.DoubleType()}, false)
+		var llvmType llvm.Type
+		switch b.fn.Name() {
+		case "Atan2":
+			// double atan2(double %y, double %x)
+			llvmType = llvm.FunctionType(b.ctx.DoubleType(), []llvm.Type{b.ctx.DoubleType(), b.ctx.DoubleType()}, false)
+		default:
+			// double foo(double %x)
+			llvmType = llvm.FunctionType(b.ctx.DoubleType(), []llvm.Type{b.ctx.DoubleType()}, false)
+		}
 		llvmFn = llvm.AddFunction(b.mod, llvmName, llvmType)
 	}
 	// Create a call to the intrinsic.
@@ -162,6 +239,24 @@ func (b *builder) defineMathOp() {
 	}
 	result := b.CreateCall(llvmFn.GlobalValueType(), llvmFn, args, "")
 	b.CreateRet(result)
+	return true
+}
+
+func (b *builder) defineCryptoIntrinsic() bool {
+	if b.fn.Pkg.Pkg.Path() != "crypto/internal/constanttime" {
+		return false
+	}
+
+	switch b.fn.Name() {
+	case "boolToUint8":
+		b.createFunctionStart(true)
+		param := b.getValue(b.fn.Params[0], b.fn.Pos())
+		result := b.CreateZExt(param, b.ctx.Int8Type(), "")
+		b.CreateRet(result)
+		return true
+	}
+
+	return false
 }

 // Implement most math/bits functions.
@@ -1,10 +1,10 @@
 package compiler

 import (
+	"encoding/binary"
 	"fmt"
 	"go/token"
 	"go/types"
-	"math/big"
 	"strings"

 	"github.com/tinygo-org/tinygo/compileopts"
@@ -54,7 +54,7 @@ func (b *builder) emitLifetimeEnd(ptr, size llvm.Value) {
 // pointer value directly. It returns the pointer with the packed data.
 // If the values are all constants, they are be stored in a constant global and
 // deduplicated.
-func (b *builder) emitPointerPack(values []llvm.Value) llvm.Value {
+func (b *builder) emitPointerPack(values []llvm.Value, pos token.Pos) llvm.Value {
 	valueTypes := make([]llvm.Type, len(values))
 	for i, value := range values {
 		valueTypes[i] = value.Type()
@@ -128,14 +128,9 @@ func (b *builder) emitPointerPack(values []llvm.Value) llvm.Value {

 		// Packed data is bigger than a pointer, so allocate it on the heap.
 		sizeValue := llvm.ConstInt(b.uintptrType, size, false)
+		layoutValue := b.createObjectLayout(packedType, pos)
 		align := b.targetData.ABITypeAlignment(packedType)
-		alloc := b.mod.NamedFunction("runtime.alloc")
-		packedAlloc := b.CreateCall(alloc.GlobalValueType(), alloc, []llvm.Value{
-			sizeValue,
-			llvm.ConstNull(b.dataPtrType),
-			llvm.Undef(b.dataPtrType), // unused context parameter
-		}, "")
-		packedAlloc.AddCallSiteAttribute(0, b.ctx.CreateEnumAttribute(llvm.AttributeKindID("align"), uint64(align)))
+		packedAlloc := b.createAlloc(sizeValue, layoutValue, align, "")
 		if b.NeedsStackObjects {
 			b.trackPointer(packedAlloc)
 		}
@@ -212,7 +207,7 @@ func (c *compilerContext) makeGlobalArray(buf []byte, name string, elementType l
 	globalType := llvm.ArrayType(elementType, len(buf))
 	global := llvm.AddGlobal(c.mod, globalType, name)
 	value := llvm.Undef(globalType)
-	for i := 0; i < len(buf); i++ {
+	for i := range buf {
 		ch := uint64(buf[i])
 		value = c.builder.CreateInsertValue(value, llvm.ConstInt(elementType, ch, false), i, "")
 	}
@@ -231,6 +226,12 @@ func (c *compilerContext) makeGlobalArray(buf []byte, name string, elementType l
 //
 // For details on what's in this value, see src/runtime/gc_precise.go.
 func (c *compilerContext) createObjectLayout(t llvm.Type, pos token.Pos) llvm.Value {
+	if !typeHasPointers(t) {
+		// There are no pointers in this type, so we can simplify the layout.
+		layout := (uint64(1) << 1) | 1
+		return llvm.ConstIntToPtr(llvm.ConstInt(c.uintptrType, layout, false), c.dataPtrType)
+	}
+
 	// Use the element type for arrays. This works even for nested arrays.
 	for {
 		kind := t.TypeKind()
@@ -248,54 +249,29 @@ func (c *compilerContext) createObjectLayout(t llvm.Type, pos token.Pos) llvm.Va
 		break
 	}

-	// Do a few checks to see whether we need to generate any object layout
-	// information at all.
+	// Create the pointer bitmap.
 	objectSizeBytes := c.targetData.TypeAllocSize(t)
+	pointerAlignment := uint64(c.targetData.PrefTypeAlignment(c.dataPtrType))
+	bitmapLen := objectSizeBytes / pointerAlignment
+	bitmapBytes := (bitmapLen + 7) / 8
+	bitmap := make([]byte, bitmapBytes, max(bitmapBytes, 8))
+	c.buildPointerBitmap(bitmap, pointerAlignment, pos, t, 0)
+
+	// Try to encode the layout inline.
 	pointerSize := c.targetData.TypeAllocSize(c.dataPtrType)
-	pointerAlignment := c.targetData.PrefTypeAlignment(c.dataPtrType)
-	if objectSizeBytes < pointerSize {
-		// Too small to contain a pointer.
-		layout := (uint64(1) << 1) | 1
-		return llvm.ConstIntToPtr(llvm.ConstInt(c.uintptrType, layout, false), c.dataPtrType)
-	}
-	bitmap := c.getPointerBitmap(t, pos)
-	if bitmap.BitLen() == 0 {
-		// There are no pointers in this type, so we can simplify the layout.
-		// TODO: this can be done in many other cases, e.g. when allocating an
-		// array (like [4][]byte, which repeats a slice 4 times).
-		layout := (uint64(1) << 1) | 1
-		return llvm.ConstIntToPtr(llvm.ConstInt(c.uintptrType, layout, false), c.dataPtrType)
-	}
-	if objectSizeBytes%uint64(pointerAlignment) != 0 {
-		// This shouldn't happen except for packed structs, which aren't
-		// currently used.
-		c.addError(pos, "internal error: unexpected object size for object with pointer field")
-		return llvm.ConstNull(c.dataPtrType)
-	}
-	objectSizeWords := objectSizeBytes / uint64(pointerAlignment)
-
 	pointerBits := pointerSize * 8
-	var sizeFieldBits uint64
-	switch pointerBits {
-	case 16:
-		sizeFieldBits = 4
-	case 32:
-		sizeFieldBits = 5
-	case 64:
-		sizeFieldBits = 6
-	default:
-		panic("unknown pointer size")
-	}
-	layoutFieldBits := pointerBits - 1 - sizeFieldBits
+	if bitmapLen < pointerBits {
+		rawMask := binary.LittleEndian.Uint64(bitmap[0:8])
+		layout := rawMask*pointerBits + bitmapLen
+		layout <<= 1
+		layout |= 1

-	// Try to emit the value as an inline integer. This is possible in most
-	// cases.
-	if objectSizeWords < layoutFieldBits {
-		// If it can be stored directly in the pointer value, do so.
-		// The runtime knows that if the least significant bit of the pointer is
-		// set, the pointer contains the value itself.
-		layout := bitmap.Uint64()<<(sizeFieldBits+1) | (objectSizeWords << 1) | 1
-		return llvm.ConstIntToPtr(llvm.ConstInt(c.uintptrType, layout, false), c.dataPtrType)
+		// Check if the layout fits.
+		layout &= 1<<pointerBits - 1
+		if (layout>>1)/pointerBits == rawMask {
+			// No set bits were shifted off.
+			return llvm.ConstIntToPtr(llvm.ConstInt(c.uintptrType, layout, false), c.dataPtrType)
+		}
 	}

 	// Unfortunately, the object layout is too big to fit in a pointer-sized
@@ -303,25 +279,24 @@ func (c *compilerContext) createObjectLayout(t llvm.Type, pos token.Pos) llvm.Va

 	// Try first whether the global already exists. All objects with a
 	// particular name have the same type, so this is possible.
-	globalName := "runtime/gc.layout:" + fmt.Sprintf("%d-%0*x", objectSizeWords, (objectSizeWords+15)/16, bitmap)
+	globalName := "runtime/gc.layout:" + fmt.Sprintf("%d-%0*x", bitmapLen, (bitmapLen+15)/16, bitmap)
 	global := c.mod.NamedGlobal(globalName)
 	if !global.IsNil() {
 		return global
 	}

 	// Create the global initializer.
-	bitmapBytes := make([]byte, int(objectSizeWords+7)/8)
-	bitmap.FillBytes(bitmapBytes)
-	reverseBytes(bitmapBytes) // big-endian to little-endian
-	var bitmapByteValues []llvm.Value
-	for _, b := range bitmapBytes {
-		bitmapByteValues = append(bitmapByteValues, llvm.ConstInt(c.ctx.Int8Type(), uint64(b), false))
+	bitmapByteValues := make([]llvm.Value, bitmapBytes)
+	i8 := c.ctx.Int8Type()
+	for i, b := range bitmap {
+		bitmapByteValues[i] = llvm.ConstInt(i8, uint64(b), false)
 	}
 	initializer := c.ctx.ConstStruct([]llvm.Value{
-		llvm.ConstInt(c.uintptrType, objectSizeWords, false),
-		llvm.ConstArray(c.ctx.Int8Type(), bitmapByteValues),
+		llvm.ConstInt(c.uintptrType, bitmapLen, false),
+		llvm.ConstArray(i8, bitmapByteValues),
 	}, false)

+	// Create the actual global.
 	global = llvm.AddGlobal(c.mod, initializer.Type(), globalName)
 	global.SetInitializer(initializer)
 	global.SetUnnamedAddr(true)
@@ -329,6 +304,7 @@ func (c *compilerContext) createObjectLayout(t llvm.Type, pos token.Pos) llvm.Va
 	global.SetLinkage(llvm.LinkOnceODRLinkage)
 	if c.targetData.PrefTypeAlignment(c.uintptrType) < 2 {
 		// AVR doesn't have alignment by default.
+		// The lowest bit must be unset to distinguish this from an inline layout.
 		global.SetAlignment(2)
 	}
 	if c.Debug && pos != token.NoPos {
@@ -360,59 +336,71 @@ func (c *compilerContext) createObjectLayout(t llvm.Type, pos token.Pos) llvm.Va
 	return global
 }

-// getPointerBitmap scans the given LLVM type for pointers and sets bits in a
-// bigint at the word offset that contains a pointer. This scan is recursive.
-func (c *compilerContext) getPointerBitmap(typ llvm.Type, pos token.Pos) *big.Int {
-	alignment := c.targetData.PrefTypeAlignment(c.dataPtrType)
-	switch typ.TypeKind() {
+// buildPointerBitmap scans the given LLVM type for pointers and sets bits in a
+// bitmap at the word offset that contains a pointer. This scan is recursive.
+func (c *compilerContext) buildPointerBitmap(
+	dst []byte,
+	ptrAlign uint64,
+	pos token.Pos,
+	t llvm.Type,
+	offset uint64,
+) {
+	switch t.TypeKind() {
 	case llvm.IntegerTypeKind, llvm.FloatTypeKind, llvm.DoubleTypeKind:
-		return big.NewInt(0)
+		// These types do not contain pointers.
+
 	case llvm.PointerTypeKind:
-		return big.NewInt(1)
+		// Set the corresponding position in the bitmap.
+		dst[offset/8] |= 1 << (offset % 8)
+
 	case llvm.StructTypeKind:
-		ptrs := big.NewInt(0)
-		if typ.StructName() == "runtime.funcValue" {
-			// Hack: the type runtime.funcValue contains an 'id' field which is
-			// of type uintptr, but before the LowerFuncValues pass it actually
-			// contains a pointer (ptrtoint) to a global. This trips up the
-			// interp package. Therefore, make the id field a pointer for now.
-			typ = c.ctx.StructType([]llvm.Type{c.dataPtrType, c.dataPtrType}, false)
-		}
-		for i, subtyp := range typ.StructElementTypes() {
-			subptrs := c.getPointerBitmap(subtyp, pos)
-			if subptrs.BitLen() == 0 {
+		// Recurse over struct elements.
+		for i, et := range t.StructElementTypes() {
+			eo := c.targetData.ElementOffset(t, i)
+			if eo%uint64(ptrAlign) != 0 {
+				if typeHasPointers(et) {
+					// This error will let the compilation fail, but by continuing
+					// the error can still easily be shown.
+					c.addError(pos, "internal error: allocated struct contains unaligned pointer")
+				}
 				continue
 			}
-			offset := c.targetData.ElementOffset(typ, i)
-			if offset%uint64(alignment) != 0 {
-				// This error will let the compilation fail, but by continuing
-				// the error can still easily be shown.
-				c.addError(pos, "internal error: allocated struct contains unaligned pointer")
-				continue
-			}
-			subptrs.Lsh(subptrs, uint(offset)/uint(alignment))
-			ptrs.Or(ptrs, subptrs)
+			c.buildPointerBitmap(
+				dst,
+				ptrAlign,
+				pos,
+				et,
+				offset+(eo/ptrAlign),
+			)
 		}
-		return ptrs
+
 	case llvm.ArrayTypeKind:
-		subtyp := typ.ElementType()
-		subptrs := c.getPointerBitmap(subtyp, pos)
-		ptrs := big.NewInt(0)
-		if subptrs.BitLen() == 0 {
-			return ptrs
+		// Recurse over array elements.
+		len := t.ArrayLength()
+		if len <= 0 {
+			return
 		}
-		elementSize := c.targetData.TypeAllocSize(subtyp)
-		if elementSize%uint64(alignment) != 0 {
-			// This error will let the compilation fail (but continues so that
-			// other errors can be shown).
-			c.addError(pos, "internal error: allocated array contains unaligned pointer")
-			return ptrs
+		et := t.ElementType()
+		elementSize := c.targetData.TypeAllocSize(et)
+		if elementSize%ptrAlign != 0 {
+			if typeHasPointers(et) {
+				// This error will let the compilation fail (but continues so that
+				// other errors can be shown).
+				c.addError(pos, "internal error: allocated array contains unaligned pointer")
+			}
+			return
 		}
-		for i := 0; i < typ.ArrayLength(); i++ {
-			ptrs.Lsh(ptrs, uint(elementSize)/uint(alignment))
-			ptrs.Or(ptrs, subptrs)
+		elementSize /= ptrAlign
+		for i := range len {
+			c.buildPointerBitmap(
+				dst,
+				ptrAlign,
+				pos,
+				et,
+				offset+uint64(i)*elementSize,
+			)
 		}
-		return ptrs
+
 	default:
 		// Should not happen.
 		panic("unknown LLVM type")
@@ -430,7 +418,7 @@ func (c *compilerContext) archFamily() string {
 // features string is not one for an ARM architecture.
 func (c *compilerContext) isThumb() bool {
 	var isThumb, isNotThumb bool
-	for _, feature := range strings.Split(c.Features, ",") {
+	for feature := range strings.SplitSeq(c.Features, ",") {
 		if feature == "+thumb-mode" {
 			isThumb = true
 		}
@@ -459,6 +447,21 @@ func (b *builder) readStackPointer() llvm.Value {
 	return b.CreateCall(stacksave.GlobalValueType(), stacksave, nil, "")
 }

+// writeStackPointer emits a LLVM intrinsic call that updates the current stack
+// pointer.
+func (b *builder) writeStackPointer(sp llvm.Value) {
+	name := "llvm.stackrestore.p0"
+	if llvmutil.Version() < 18 {
+		name = "llvm.stackrestore" // backwards compatibility with LLVM 17 and below
+	}
+	stackrestore := b.mod.NamedFunction(name)
+	if stackrestore.IsNil() {
+		fnType := llvm.FunctionType(b.ctx.VoidType(), []llvm.Type{b.dataPtrType}, false)
+		stackrestore = llvm.AddFunction(b.mod, name, fnType)
+	}
+	b.CreateCall(stackrestore.GlobalValueType(), stackrestore, []llvm.Value{sp}, "")
+}
+
 // createZExtOrTrunc lets the input value fit in the output type bits, by zero
 // extending or truncating the integer.
 func (b *builder) createZExtOrTrunc(value llvm.Value, t llvm.Type) llvm.Value {
@@ -44,7 +44,7 @@ func CreateTemporaryAlloca(builder llvm.Builder, mod llvm.Module, t llvm.Type, n
 	alloca = CreateEntryBlockAlloca(builder, t, name)
 	size = llvm.ConstInt(ctx.Int64Type(), targetData.TypeAllocSize(t), false)
 	fnType, fn := getLifetimeStartFunc(mod)
-	builder.CreateCall(fnType, fn, []llvm.Value{size, alloca}, "")
+	builder.CreateCall(fnType, fn, lifetimeCallArgs(size, alloca), "")
 	return
 }

@@ -58,14 +58,14 @@ func CreateInstructionAlloca(builder llvm.Builder, mod llvm.Module, t llvm.Type,
 	builder.SetInsertPointBefore(inst)
 	size := llvm.ConstInt(ctx.Int64Type(), targetData.TypeAllocSize(t), false)
 	fnType, fn := getLifetimeStartFunc(mod)
-	builder.CreateCall(fnType, fn, []llvm.Value{size, alloca}, "")
+	builder.CreateCall(fnType, fn, lifetimeCallArgs(size, alloca), "")
 	if next := llvm.NextInstruction(inst); !next.IsNil() {
 		builder.SetInsertPointBefore(next)
 	} else {
 		builder.SetInsertPointAtEnd(inst.InstructionParent())
 	}
 	fnType, fn = getLifetimeEndFunc(mod)
-	builder.CreateCall(fnType, fn, []llvm.Value{size, alloca}, "")
+	builder.CreateCall(fnType, fn, lifetimeCallArgs(size, alloca), "")
 	return alloca
 }

@@ -74,7 +74,27 @@ func CreateInstructionAlloca(builder llvm.Builder, mod llvm.Module, t llvm.Type,
 // createTemporaryAlloca.
 func EmitLifetimeEnd(builder llvm.Builder, mod llvm.Module, ptr, size llvm.Value) {
 	fnType, fn := getLifetimeEndFunc(mod)
-	builder.CreateCall(fnType, fn, []llvm.Value{size, ptr}, "")
+	builder.CreateCall(fnType, fn, lifetimeCallArgs(size, ptr), "")
+}
+
+// lifetimeCallArgs returns the arguments to pass to a call of the
+// llvm.lifetime.start/end intrinsics. LLVM 22 dropped the (redundant,
+// already required to match the alloca size) i64 size argument, so the
+// intrinsic now only takes the pointer.
+func lifetimeCallArgs(size, ptr llvm.Value) []llvm.Value {
+	if Version() >= 22 {
+		return []llvm.Value{ptr}
+	}
+	return []llvm.Value{size, ptr}
+}
+
+// lifetimeFuncType returns the function type of the llvm.lifetime.start/end
+// intrinsics, which lost their i64 size parameter in LLVM 22.
+func lifetimeFuncType(ctx llvm.Context, ptrType llvm.Type) llvm.Type {
+	if Version() >= 22 {
+		return llvm.FunctionType(ctx.VoidType(), []llvm.Type{ptrType}, false)
+	}
+	return llvm.FunctionType(ctx.VoidType(), []llvm.Type{ctx.Int64Type(), ptrType}, false)
 }

 // getLifetimeStartFunc returns the llvm.lifetime.start intrinsic and creates it
@@ -84,7 +104,7 @@ func getLifetimeStartFunc(mod llvm.Module) (llvm.Type, llvm.Value) {
 	fn := mod.NamedFunction(fnName)
 	ctx := mod.Context()
 	ptrType := llvm.PointerType(ctx.Int8Type(), 0)
-	fnType := llvm.FunctionType(ctx.VoidType(), []llvm.Type{ctx.Int64Type(), ptrType}, false)
+	fnType := lifetimeFuncType(ctx, ptrType)
 	if fn.IsNil() {
 		fn = llvm.AddFunction(mod, fnName, fnType)
 	}
@@ -98,7 +118,7 @@ func getLifetimeEndFunc(mod llvm.Module) (llvm.Type, llvm.Value) {
 	fn := mod.NamedFunction(fnName)
 	ctx := mod.Context()
 	ptrType := llvm.PointerType(ctx.Int8Type(), 0)
-	fnType := llvm.FunctionType(ctx.VoidType(), []llvm.Type{ctx.Int64Type(), ptrType}, false)
+	fnType := lifetimeFuncType(ctx, ptrType)
 	if fn.IsNil() {
 		fn = llvm.AddFunction(mod, fnName, fnType)
 	}
@@ -218,7 +238,37 @@ func Version() int {
 	return major
 }

-// Return the byte order for the given target triple. Most targets are little
+// NoCaptureAttrName returns the name of the LLVM attribute kind that marks a
+// pointer parameter as guaranteed not to escape by capture.
+//
+// LLVM 21 removed the old boolean 'nocapture' enum attribute in favor of the
+// more expressive 'captures' int attribute, where 'captures(none)' (encoded
+// as the value 0) is the equivalent of the old 'nocapture'. LLVM 20 supports
+// both, but its own optimizer still emits 'nocapture', so the cutoff for
+// reading/writing the new name is LLVM 21.
+func NoCaptureAttrName() string {
+	if Version() >= 21 {
+		return "captures"
+	}
+	return "nocapture"
+}
+
+// IsNoCapture reports whether attr (looked up using the kind returned by
+// NoCaptureAttrName) indicates that the pointer it is attached to does not
+// escape by capture. It returns false for a nil attribute.
+func IsNoCapture(attr llvm.Attribute) bool {
+	if attr.IsNil() {
+		return false
+	}
+	if Version() >= 21 {
+		// captures(none) is encoded as the value 0; any other value permits
+		// some form of capture.
+		return attr.GetEnumValue() == 0
+	}
+	return true
+}
+
+// ByteOrder returns the byte order for the given target triple. Most targets are little
 // endian, but for example MIPS can be big-endian.
 func ByteOrder(target string) binary.ByteOrder {
 	if strings.HasPrefix(target, "mips-") {
@@ -3,42 +3,29 @@ package compiler
 // This file emits the correct map intrinsics for map operations.

 import (
+	"fmt"
 	"go/token"
 	"go/types"
-
-	"github.com/tinygo-org/tinygo/src/tinygo"
 	"golang.org/x/tools/go/ssa"
+	"strings"
 	"tinygo.org/x/go-llvm"
 )

+const hashArrayUnrollLimit = 4
+
 // createMakeMap creates a new map object (runtime.hashmap) by allocating and
 // initializing an appropriately sized object.
 func (b *builder) createMakeMap(expr *ssa.MakeMap) (llvm.Value, error) {
 	mapType := expr.Type().Underlying().(*types.Map)
 	keyType := mapType.Key().Underlying()
 	llvmValueType := b.getLLVMType(mapType.Elem().Underlying())
-	var llvmKeyType llvm.Type
-	var alg uint64
-	if t, ok := keyType.(*types.Basic); ok && t.Info()&types.IsString != 0 {
-		// String keys.
-		llvmKeyType = b.getLLVMType(keyType)
-		alg = uint64(tinygo.HashmapAlgorithmString)
-	} else if hashmapIsBinaryKey(keyType) {
-		// Trivially comparable keys.
-		llvmKeyType = b.getLLVMType(keyType)
-		alg = uint64(tinygo.HashmapAlgorithmBinary)
-	} else {
-		// All other keys. Implemented as map[interface{}]valueType for ease of
-		// implementation.
-		llvmKeyType = b.getLLVMRuntimeType("_interface")
-		alg = uint64(tinygo.HashmapAlgorithmInterface)
-	}
+	llvmKeyType := b.getLLVMType(keyType)
+
 	keySize := b.targetData.TypeAllocSize(llvmKeyType)
 	valueSize := b.targetData.TypeAllocSize(llvmValueType)
 	llvmKeySize := llvm.ConstInt(b.uintptrType, keySize, false)
 	llvmValueSize := llvm.ConstInt(b.uintptrType, valueSize, false)
 	sizeHint := llvm.ConstInt(b.uintptrType, 8, false)
-	algEnum := llvm.ConstInt(b.ctx.Int8Type(), alg, false)
 	if expr.Reserve != nil {
 		sizeHint = b.getValue(expr.Reserve, getPos(expr))
 		var err error
@@ -47,134 +34,129 @@ func (b *builder) createMakeMap(expr *ssa.MakeMap) (llvm.Value, error) {
 			return llvm.Value{}, err
 		}
 	}
-	hashmap := b.createRuntimeCall("hashmapMake", []llvm.Value{llvmKeySize, llvmValueSize, sizeHint, algEnum}, "")
+
+	// Resolve hash and equal functions for this key type. For string and
+	// binary key types, reference the corresponding runtime functions
+	// directly. For composite types, generate type-specific functions.
+	var hashFn, equalFn llvm.Value
+	if t, ok := keyType.(*types.Basic); ok && t.Info()&types.IsString != 0 {
+		hashFn = b.getRuntimeFunctionValue("hashmapStringPtrHash", hashmapKeyHashSignature())
+		equalFn = b.getRuntimeFunctionValue("hashmapStringEqual", hashmapKeyEqualSignature())
+	} else if hashmapIsBinaryKey(keyType) {
+		hashFn = b.getRuntimeFunctionValue("hash32", hashmapKeyHashSignature())
+		equalFn = b.getRuntimeFunctionValue("memequal", hashmapKeyEqualSignature())
+	} else {
+		fn := b.getOrGenerateKeyHashFunc(keyType)
+		hashFn = b.createFuncValue(fn, llvm.ConstNull(b.dataPtrType), hashmapKeyHashSignature())
+		fn = b.getOrGenerateKeyEqualFunc(keyType)
+		equalFn = b.createFuncValue(fn, llvm.ConstNull(b.dataPtrType), hashmapKeyEqualSignature())
+	}
+
+	hashmap := b.createRuntimeCall("hashmapMakeGeneric", []llvm.Value{
+		llvmKeySize, llvmValueSize, sizeHint,
+		hashFn, equalFn,
+	}, "")
 	return hashmap, nil
 }

+// getRuntimeFunctionValue returns a TinyGo function value (with nil context)
+// for the named runtime function.
+func (b *builder) getRuntimeFunctionValue(name string, sig *types.Signature) llvm.Value {
+	member := b.program.ImportedPackage("runtime").Members[name]
+	if member == nil {
+		panic("unknown runtime function: " + name)
+	}
+	_, llvmFn := b.getFunction(member.(*ssa.Function))
+	return b.createFuncValue(llvmFn, llvm.ConstNull(b.dataPtrType), sig)
+}
+
 // createMapLookup returns the value in a map. It calls a runtime function
 // depending on the map key type to load the map value and its comma-ok value.
-func (b *builder) createMapLookup(keyType, valueType types.Type, m, key llvm.Value, commaOk bool, pos token.Pos) (llvm.Value, error) {
+func (b *builder) createMapLookup(keyType, valueType types.Type, m llvm.Value, key ssa.Value, commaOk bool, pos token.Pos) (llvm.Value, error) {
 	llvmValueType := b.getLLVMType(valueType)

 	// Allocate the memory for the resulting type. Do not zero this memory: it
 	// will be zeroed by the hashmap get implementation if the key is not
 	// present in the map.
-	mapValueAlloca, mapValueAllocaSize := b.createTemporaryAlloca(llvmValueType, "hashmap.value")
+	result := b.createRuntimeValueResult(llvmValueType, commaOk, false, "hashmap")
+	mapValueAlloca := result.valuePtr

 	// We need the map size (with type uintptr) to pass to the hashmap*Get
 	// functions. This is necessary because those *Get functions are valid on
 	// nil maps, and they'll need to zero the value pointer by that number of
 	// bytes.
-	mapValueSize := mapValueAllocaSize
+	mapValueSize := result.valueSize
 	if mapValueSize.Type().IntTypeWidth() > b.uintptrType.IntTypeWidth() {
 		mapValueSize = llvm.ConstTrunc(mapValueSize, b.uintptrType)
 	}

 	// Do the lookup. How it is done depends on the key type.
 	var commaOkValue llvm.Value
-	origKeyType := keyType
 	keyType = keyType.Underlying()
 	if t, ok := keyType.(*types.Basic); ok && t.Info()&types.IsString != 0 {
 		// key is a string
-		params := []llvm.Value{m, key, mapValueAlloca, mapValueSize}
+		params := []llvm.Value{m, b.getValue(key, getPos(key)), mapValueAlloca, mapValueSize}
 		commaOkValue = b.createRuntimeCall("hashmapStringGet", params, "")
-	} else if hashmapIsBinaryKey(keyType) {
-		// key can be compared with runtime.memequal
-		// Store the key in an alloca, in the entry block to avoid dynamic stack
-		// growth.
-		mapKeyAlloca, mapKeySize := b.createTemporaryAlloca(key.Type(), "hashmap.key")
-		b.CreateStore(key, mapKeyAlloca)
-		b.zeroUndefBytes(b.getLLVMType(keyType), mapKeyAlloca)
-		// Fetch the value from the hashmap.
-		params := []llvm.Value{m, mapKeyAlloca, mapValueAlloca, mapValueSize}
-		commaOkValue = b.createRuntimeCall("hashmapBinaryGet", params, "")
-		b.emitLifetimeEnd(mapKeyAlloca, mapKeySize)
 	} else {
-		// Not trivially comparable using memcmp. Make it an interface instead.
-		itfKey := key
-		if _, ok := keyType.(*types.Interface); !ok {
-			// Not already an interface, so convert it to an interface now.
-			itfKey = b.createMakeInterface(key, origKeyType, pos)
+		// Key stored at actual type: either binary-comparable or with
+		// compiler-generated hash/equal.
+		mapKey := b.getValueStorage(key, "hashmap.key")
+		params := []llvm.Value{m, mapKey.ptr, mapValueAlloca, mapValueSize}
+		fnName := "hashmapBinaryGet"
+		if !hashmapIsBinaryKey(keyType) {
+			fnName = "hashmapGenericGet"
 		}
-		params := []llvm.Value{m, itfKey, mapValueAlloca, mapValueSize}
-		commaOkValue = b.createRuntimeCall("hashmapInterfaceGet", params, "")
+		commaOkValue = b.createRuntimeCall(fnName, params, "")
+		b.endValueStorage(mapKey)
 	}

-	// Load the resulting value from the hashmap. The value is set to the zero
-	// value if the key doesn't exist in the hashmap.
-	mapValue := b.CreateLoad(llvmValueType, mapValueAlloca, "")
-	b.emitLifetimeEnd(mapValueAlloca, mapValueAllocaSize)
-
-	if commaOk {
-		tuple := llvm.Undef(b.ctx.StructType([]llvm.Type{llvmValueType, b.ctx.Int1Type()}, false))
-		tuple = b.CreateInsertValue(tuple, mapValue, 0, "")
-		tuple = b.CreateInsertValue(tuple, commaOkValue, 1, "")
-		return tuple, nil
-	} else {
-		return mapValue, nil
-	}
+	// The value is set to the zero value if the key doesn't exist.
+	return result.finish(b, commaOkValue, ""), nil
 }

 // createMapUpdate updates a map key to a given value, by creating an
 // appropriate runtime call.
-func (b *builder) createMapUpdate(keyType types.Type, m, key, value llvm.Value, pos token.Pos) {
-	valueAlloca, valueSize := b.createTemporaryAlloca(value.Type(), "hashmap.value")
-	b.CreateStore(value, valueAlloca)
-	origKeyType := keyType
+func (b *builder) createMapUpdate(keyType types.Type, m llvm.Value, key, value ssa.Value, pos token.Pos) {
+	storedValue := b.getValueStorage(value, "hashmap.value")
 	keyType = keyType.Underlying()
 	if t, ok := keyType.(*types.Basic); ok && t.Info()&types.IsString != 0 {
 		// key is a string
-		params := []llvm.Value{m, key, valueAlloca}
-		b.createRuntimeCall("hashmapStringSet", params, "")
-	} else if hashmapIsBinaryKey(keyType) {
-		// key can be compared with runtime.memequal
-		keyAlloca, keySize := b.createTemporaryAlloca(key.Type(), "hashmap.key")
-		b.CreateStore(key, keyAlloca)
-		b.zeroUndefBytes(b.getLLVMType(keyType), keyAlloca)
-		params := []llvm.Value{m, keyAlloca, valueAlloca}
-		b.createRuntimeCall("hashmapBinarySet", params, "")
-		b.emitLifetimeEnd(keyAlloca, keySize)
+		params := []llvm.Value{m, b.getValue(key, getPos(key)), storedValue.ptr}
+		b.createRuntimeInvoke("hashmapStringSet", params, "")
 	} else {
-		// Key is not trivially comparable, so compare it as an interface instead.
-		itfKey := key
-		if _, ok := keyType.(*types.Interface); !ok {
-			// Not already an interface, so convert it to an interface first.
-			itfKey = b.createMakeInterface(key, origKeyType, pos)
+		// Key stored at actual type.
+		keyStorage := b.getValueStorage(key, "hashmap.key")
+		fnName := "hashmapBinarySet"
+		if !hashmapIsBinaryKey(keyType) {
+			fnName = "hashmapGenericSet"
 		}
-		params := []llvm.Value{m, itfKey, valueAlloca}
-		b.createRuntimeCall("hashmapInterfaceSet", params, "")
+		params := []llvm.Value{m, keyStorage.ptr, storedValue.ptr}
+		b.createRuntimeInvoke(fnName, params, "")
+		b.endValueStorage(keyStorage)
 	}
-	b.emitLifetimeEnd(valueAlloca, valueSize)
+	b.endValueStorage(storedValue)
 }

 // createMapDelete deletes a key from a map by calling the appropriate runtime
 // function. It is the implementation of the Go delete() builtin.
 func (b *builder) createMapDelete(keyType types.Type, m, key llvm.Value, pos token.Pos) error {
-	origKeyType := keyType
 	keyType = keyType.Underlying()
 	if t, ok := keyType.(*types.Basic); ok && t.Info()&types.IsString != 0 {
 		// key is a string
 		params := []llvm.Value{m, key}
 		b.createRuntimeCall("hashmapStringDelete", params, "")
 		return nil
-	} else if hashmapIsBinaryKey(keyType) {
+	} else {
+		// Key stored at actual type.
 		keyAlloca, keySize := b.createTemporaryAlloca(key.Type(), "hashmap.key")
 		b.CreateStore(key, keyAlloca)
-		b.zeroUndefBytes(b.getLLVMType(keyType), keyAlloca)
-		params := []llvm.Value{m, keyAlloca}
-		b.createRuntimeCall("hashmapBinaryDelete", params, "")
-		b.emitLifetimeEnd(keyAlloca, keySize)
-		return nil
-	} else {
-		// Key is not trivially comparable, so compare it as an interface
-		// instead.
-		itfKey := key
-		if _, ok := keyType.(*types.Interface); !ok {
-			// Not already an interface, so convert it to an interface first.
-			itfKey = b.createMakeInterface(key, origKeyType, pos)
+		fnName := "hashmapBinaryDelete"
+		if !hashmapIsBinaryKey(keyType) {
+			fnName = "hashmapGenericDelete"
 		}
-		params := []llvm.Value{m, itfKey}
-		b.createRuntimeCall("hashmapInterfaceDelete", params, "")
+		params := []llvm.Value{m, keyAlloca}
+		b.createRuntimeCall(fnName, params, "")
+		b.emitLifetimeEnd(keyAlloca, keySize)
 		return nil
 	}
 }
@@ -195,42 +177,15 @@ func (b *builder) createMapIteratorNext(rangeVal ssa.Value, llvmRangeVal, it llv
 	llvmKeyType := b.getLLVMType(keyType)
 	llvmValueType := b.getLLVMType(valueType)

-	// There is a special case in which keys are stored as an interface value
-	// instead of the value they normally are. This happens for non-trivially
-	// comparable types such as float32 or some structs.
-	isKeyStoredAsInterface := false
-	if t, ok := keyType.Underlying().(*types.Basic); ok && t.Info()&types.IsString != 0 {
-		// key is a string
-	} else if hashmapIsBinaryKey(keyType) {
-		// key can be compared with runtime.memequal
-	} else {
-		// The key is stored as an interface value, and may or may not be an
-		// interface type (for example, float32 keys are stored as an interface
-		// value).
-		if _, ok := keyType.Underlying().(*types.Interface); !ok {
-			isKeyStoredAsInterface = true
-		}
-	}
-
-	// Determine the type of the key as stored in the map.
-	llvmStoredKeyType := llvmKeyType
-	if isKeyStoredAsInterface {
-		llvmStoredKeyType = b.getLLVMRuntimeType("_interface")
-	}
+	// All key types are now stored at their declared type (no interface wrapping).

 	// Extract the key and value from the map.
-	mapKeyAlloca, mapKeySize := b.createTemporaryAlloca(llvmStoredKeyType, "range.key")
+	mapKeyAlloca, mapKeySize := b.createTemporaryAlloca(llvmKeyType, "range.key")
 	mapValueAlloca, mapValueSize := b.createTemporaryAlloca(llvmValueType, "range.value")
 	ok := b.createRuntimeCall("hashmapNext", []llvm.Value{llvmRangeVal, it, mapKeyAlloca, mapValueAlloca}, "range.next")
-	mapKey := b.CreateLoad(llvmStoredKeyType, mapKeyAlloca, "")
+	mapKey := b.CreateLoad(llvmKeyType, mapKeyAlloca, "")
 	mapValue := b.CreateLoad(llvmValueType, mapValueAlloca, "")

-	if isKeyStoredAsInterface {
-		// The key is stored as an interface but it isn't of interface type.
-		// Extract the underlying value.
-		mapKey = b.extractValueFromInterface(mapKey, llvmKeyType)
-	}
-
 	// End the lifetimes of the allocas, because we're done with them.
 	b.emitLifetimeEnd(mapKeyAlloca, mapKeySize)
 	b.emitLifetimeEnd(mapValueAlloca, mapValueSize)
@@ -248,90 +203,412 @@ func (b *builder) createMapIteratorNext(rangeVal ssa.Value, llvmRangeVal, it llv
 // can be compared with runtime.memequal.  Note that padding bytes are undef
 // and can alter two "equal" structs being equal when compared with memequal.
 func hashmapIsBinaryKey(keyType types.Type) bool {
-	switch keyType := keyType.(type) {
+	switch keyType := keyType.Underlying().(type) {
 	case *types.Basic:
-		return keyType.Info()&(types.IsBoolean|types.IsInteger) != 0
+		return keyType.Info()&(types.IsBoolean|types.IsInteger) != 0 || keyType.Kind() == types.UnsafePointer
 	case *types.Pointer:
 		return true
-	case *types.Struct:
-		for i := 0; i < keyType.NumFields(); i++ {
-			fieldType := keyType.Field(i).Type().Underlying()
-			if !hashmapIsBinaryKey(fieldType) {
-				return false
-			}
-		}
-		return true
 	case *types.Array:
 		return hashmapIsBinaryKey(keyType.Elem())
-	case *types.Named:
-		return hashmapIsBinaryKey(keyType.Underlying())
 	default:
 		return false
 	}
 }

-func (b *builder) zeroUndefBytes(llvmType llvm.Type, ptr llvm.Value) error {
-	// We know that hashmapIsBinaryKey is true, so we only have to handle those types that can show up there.
-	// To zero all undefined bytes, we iterate over all the fields in the type.  For each element, compute the
-	// offset of that element.  If it's Basic type, there are no internal padding bytes.  For compound types, we recurse to ensure
-	// we handle nested types.  Next, we determine if there are any padding bytes before the next
-	// element and zero those as well.
+// hashmapKeyHashSignature returns the Go type signature for hashmap key hash
+// functions: func(key unsafe.Pointer, size, seed uintptr) uint32
+func hashmapKeyHashSignature() *types.Signature {
+	return types.NewSignatureType(nil, nil, nil,
+		types.NewTuple(
+			types.NewVar(token.NoPos, nil, "key", types.Typ[types.UnsafePointer]),
+			types.NewVar(token.NoPos, nil, "size", types.Typ[types.Uintptr]),
+			types.NewVar(token.NoPos, nil, "seed", types.Typ[types.Uintptr]),
+		),
+		types.NewTuple(
+			types.NewVar(token.NoPos, nil, "", types.Typ[types.Uint32]),
+		),
+		false,
+	)
+}

-	zero := llvm.ConstInt(b.ctx.Int32Type(), 0, false)
+// hashmapKeyEqualSignature returns the Go type signature for hashmap key equal
+// functions: func(x, y unsafe.Pointer, n uintptr) bool
+func hashmapKeyEqualSignature() *types.Signature {
+	return types.NewSignatureType(nil, nil, nil,
+		types.NewTuple(
+			types.NewVar(token.NoPos, nil, "x", types.Typ[types.UnsafePointer]),
+			types.NewVar(token.NoPos, nil, "y", types.Typ[types.UnsafePointer]),
+			types.NewVar(token.NoPos, nil, "n", types.Typ[types.Uintptr]),
+		),
+		types.NewTuple(
+			types.NewVar(token.NoPos, nil, "", types.Typ[types.Bool]),
+		),
+		false,
+	)
+}

-	switch llvmType.TypeKind() {
-	case llvm.IntegerTypeKind:
-		// no padding bytes
-		return nil
-	case llvm.PointerTypeKind:
-		// mo padding bytes
-		return nil
-	case llvm.ArrayTypeKind:
-		llvmArrayType := llvmType
-		llvmElemType := llvmType.ElementType()
+// hashmapKeyFuncName returns a canonical name for a generated hash or equal
+// function based on the key type's underlying structure. Named types are
+// replaced with their underlying types so that structurally identical key
+// types (e.g., struct{i1; str1} and struct{i2; str2} where both i1, i2 are
+// int and str1, str2 are string) share the same generated function.
+func hashmapKeyFuncName(prefix string, keyType types.Type) string {
+	return prefix + "." + hashmapCanonicalTypeName(keyType)
+}

-		for i := 0; i < llvmArrayType.ArrayLength(); i++ {
-			idx := llvm.ConstInt(b.uintptrType, uint64(i), false)
-			elemPtr := b.CreateInBoundsGEP(llvmArrayType, ptr, []llvm.Value{zero, idx}, "")
-
-			// zero any padding bytes in this element
-			b.zeroUndefBytes(llvmElemType, elemPtr)
+// hashmapCanonicalTypeName returns a string representation of the hash/equal
+// operations needed for a type, stripping named types where the operation does
+// not depend on the name. Pointer and channel names do not include the element
+// type because their hash/equal operations only use the pointer word.
+func hashmapCanonicalTypeName(t types.Type) string {
+	switch t := t.Underlying().(type) {
+	case *types.Basic:
+		return t.Name()
+	case *types.Pointer:
+		return "*"
+	case *types.Chan:
+		switch t.Dir() {
+		case types.SendRecv:
+			return "chan"
+		case types.SendOnly:
+			return "chan<-"
+		case types.RecvOnly:
+			return "<-chan"
 		}
-
-	case llvm.StructTypeKind:
-		llvmStructType := llvmType
-		numFields := llvmStructType.StructElementTypesCount()
-		llvmElementTypes := llvmStructType.StructElementTypes()
-
-		for i := 0; i < numFields; i++ {
-			idx := llvm.ConstInt(b.ctx.Int32Type(), uint64(i), false)
-			elemPtr := b.CreateInBoundsGEP(llvmStructType, ptr, []llvm.Value{zero, idx}, "")
-
-			// zero any padding bytes in this field
-			llvmElemType := llvmElementTypes[i]
-			b.zeroUndefBytes(llvmElemType, elemPtr)
-
-			// zero any padding bytes before the next field, if any
-			offset := b.targetData.ElementOffset(llvmStructType, i)
-			storeSize := b.targetData.TypeStoreSize(llvmElemType)
-			fieldEndOffset := offset + storeSize
-
-			var nextOffset uint64
-			if i < numFields-1 {
-				nextOffset = b.targetData.ElementOffset(llvmStructType, i+1)
-			} else {
-				// Last field?  Next offset is the total size of the allocate struct.
-				nextOffset = b.targetData.TypeAllocSize(llvmStructType)
-			}
-
-			if fieldEndOffset != nextOffset {
-				n := llvm.ConstInt(b.uintptrType, nextOffset-fieldEndOffset, false)
-				llvmStoreSize := llvm.ConstInt(b.uintptrType, storeSize, false)
-				paddingStart := b.CreateInBoundsGEP(b.ctx.Int8Type(), elemPtr, []llvm.Value{llvmStoreSize}, "")
-				b.createRuntimeCall("memzero", []llvm.Value{paddingStart, n}, "")
-			}
+	case *types.Interface:
+		if t.NumMethods() == 0 {
+			return "interface{}"
 		}
+		return t.String()
+	case *types.Struct:
+		var s strings.Builder
+		s.WriteString("struct{")
+		for i := 0; i < t.NumFields(); i++ {
+			if i > 0 {
+				s.WriteString("; ")
+			}
+			s.WriteString(hashmapCanonicalTypeName(t.Field(i).Type()))
+		}
+		return s.String() + "}"
+	case *types.Array:
+		return fmt.Sprintf("[%d]%s", t.Len(), hashmapCanonicalTypeName(t.Elem()))
+	}
+	return t.String()
+}
+
+// getOrGenerateKeyHashFunc returns an LLVM function that computes the hash
+// of a key of the given type. The function is generated on first call and
+// cached in the module.
+func (b *builder) getOrGenerateKeyHashFunc(keyType types.Type) llvm.Value {
+	name := hashmapKeyFuncName("hashmapKeyHash", keyType)
+	if fn := b.mod.NamedFunction(name); !fn.IsNil() {
+		return fn
 	}

-	return nil
+	// Create the LLVM function type:
+	// (key ptr, size uintptr, seed uintptr, context ptr) -> i32
+	fnType := llvm.FunctionType(b.ctx.Int32Type(), []llvm.Type{
+		b.dataPtrType, b.uintptrType, b.uintptrType, b.dataPtrType,
+	}, false)
+	fn := llvm.AddFunction(b.mod, name, fnType)
+	fn.SetLinkage(llvm.LinkOnceODRLinkage)
+	fn.SetUnnamedAddr(true)
+	b.addStandardAttributes(fn)
+
+	// Generate the function body.
+	savedBlock := b.GetInsertBlock()
+	defer b.SetInsertPointAtEnd(savedBlock)
+
+	entry := b.ctx.AddBasicBlock(fn, "entry")
+	b.SetInsertPointAtEnd(entry)
+
+	keyPtr := fn.Param(0)
+	seed := fn.Param(2)
+	llvmKeyType := b.getLLVMType(keyType)
+	hash := b.generateKeyHash(keyType, llvmKeyType, keyPtr, seed)
+	b.CreateRet(hash)
+
+	return fn
+}
+
+// getOrGenerateKeyEqualFunc returns an LLVM function that compares two keys
+// of the given type for equality. The function is generated on first call
+// and cached in the module.
+func (b *builder) getOrGenerateKeyEqualFunc(keyType types.Type) llvm.Value {
+	name := hashmapKeyFuncName("hashmapKeyEqual", keyType)
+	if fn := b.mod.NamedFunction(name); !fn.IsNil() {
+		return fn
+	}
+
+	// Create the LLVM function type:
+	// (x ptr, y ptr, n uintptr, context ptr) -> i1
+	fnType := llvm.FunctionType(b.ctx.Int1Type(), []llvm.Type{
+		b.dataPtrType, b.dataPtrType, b.uintptrType, b.dataPtrType,
+	}, false)
+	fn := llvm.AddFunction(b.mod, name, fnType)
+	fn.SetLinkage(llvm.LinkOnceODRLinkage)
+	fn.SetUnnamedAddr(true)
+	b.addStandardAttributes(fn)
+
+	// Generate the function body.
+	savedBlock := b.GetInsertBlock()
+	defer b.SetInsertPointAtEnd(savedBlock)
+
+	entry := b.ctx.AddBasicBlock(fn, "entry")
+	b.SetInsertPointAtEnd(entry)
+
+	xPtr := fn.Param(0)
+	yPtr := fn.Param(1)
+	llvmKeyType := b.getLLVMType(keyType)
+	result := b.generateKeyEqual(keyType, llvmKeyType, xPtr, yPtr, fn)
+	b.CreateRet(result)
+
+	return fn
+}
+
+// generateKeyHash generates IR that hashes a key value. Returns the i32 hash.
+func (b *builder) generateKeyHash(keyType types.Type, llvmKeyType llvm.Type, keyPtr llvm.Value, seed llvm.Value) llvm.Value {
+	switch keyType := keyType.Underlying().(type) {
+	case *types.Basic:
+		if keyType.Info()&types.IsString != 0 {
+			// Hash the string contents. The size parameter is unused by
+			// hashmapStringPtrHash (it dereferences the string header to
+			// get the actual length), but we pass it for signature
+			// consistency with other hash functions.
+			size := llvm.ConstInt(b.uintptrType, b.targetData.TypeAllocSize(llvmKeyType), false)
+			return b.createRuntimeCall("hashmapStringPtrHash", []llvm.Value{keyPtr, size, seed}, "hash")
+		}
+		if keyType.Info()&types.IsFloat != 0 {
+			// Float hash: normalizes -0 to +0 before hashing.
+			if keyType.Kind() == types.Float32 {
+				return b.createRuntimeCall("hashmapFloat32Hash", []llvm.Value{keyPtr, seed}, "hash")
+			}
+			return b.createRuntimeCall("hashmapFloat64Hash", []llvm.Value{keyPtr, seed}, "hash")
+		}
+		if keyType.Info()&types.IsComplex != 0 {
+			// Complex hash: hash real and imaginary parts as floats.
+			if keyType.Kind() == types.Complex64 {
+				realPtr := keyPtr
+				imagPtr := b.CreateInBoundsGEP(b.ctx.Int8Type(), keyPtr, []llvm.Value{
+					llvm.ConstInt(b.uintptrType, 4, false),
+				}, "")
+				realHash := b.createRuntimeCall("hashmapFloat32Hash", []llvm.Value{realPtr, seed}, "hash.real")
+				imagHash := b.createRuntimeCall("hashmapFloat32Hash", []llvm.Value{imagPtr, seed}, "hash.imag")
+				return b.CreateXor(realHash, imagHash, "")
+			}
+			realPtr := keyPtr
+			imagPtr := b.CreateInBoundsGEP(b.ctx.Int8Type(), keyPtr, []llvm.Value{
+				llvm.ConstInt(b.uintptrType, 8, false),
+			}, "")
+			realHash := b.createRuntimeCall("hashmapFloat64Hash", []llvm.Value{realPtr, seed}, "hash.real")
+			imagHash := b.createRuntimeCall("hashmapFloat64Hash", []llvm.Value{imagPtr, seed}, "hash.imag")
+			return b.CreateXor(realHash, imagHash, "")
+		}
+		// Integer/boolean: hash the raw bytes.
+		size := llvm.ConstInt(b.uintptrType, b.targetData.TypeAllocSize(llvmKeyType), false)
+		return b.createRuntimeCall("hash32", []llvm.Value{keyPtr, size, seed}, "hash")
+	case *types.Pointer, *types.Chan:
+		// Pointers and channels: hash as raw pointer-sized bytes.
+		size := llvm.ConstInt(b.uintptrType, b.targetData.TypeAllocSize(llvmKeyType), false)
+		return b.createRuntimeCall("hash32", []llvm.Value{keyPtr, size, seed}, "hash")
+	case *types.Interface:
+		// Interface: use runtime reflection-based hash.
+		size := llvm.ConstInt(b.uintptrType, b.targetData.TypeAllocSize(llvmKeyType), false)
+		return b.createRuntimeCall("hashmapInterfacePtrHash", []llvm.Value{keyPtr, size, seed}, "hash")
+	case *types.Struct:
+		hash := llvm.ConstInt(b.ctx.Int32Type(), 0, false)
+		zero := llvm.ConstInt(b.ctx.Int32Type(), 0, false)
+		for i := 0; i < keyType.NumFields(); i++ {
+			if keyType.Field(i).Name() == "_" {
+				continue // blank fields are ignored in Go equality
+			}
+			fieldType := keyType.Field(i).Type()
+			llvmFieldType := b.getLLVMType(fieldType)
+			if b.targetData.TypeAllocSize(llvmFieldType) == 0 {
+				continue // skip zero-sized fields
+			}
+			idx := llvm.ConstInt(b.ctx.Int32Type(), uint64(i), false)
+			fieldPtr := b.CreateInBoundsGEP(llvmKeyType, keyPtr, []llvm.Value{zero, idx}, "")
+			fieldHash := b.generateKeyHash(fieldType, llvmFieldType, fieldPtr, seed)
+			hash = b.CreateXor(hash, fieldHash, "")
+		}
+		return hash
+	case *types.Array:
+		elemType := keyType.Elem()
+		llvmElemType := b.getLLVMType(elemType)
+		arrayLen := keyType.Len()
+		if hashmapIsBinaryKey(elemType) {
+			// All elements are binary-comparable; hash the entire array as raw bytes.
+			size := llvm.ConstInt(b.uintptrType, b.targetData.TypeAllocSize(llvmKeyType), false)
+			return b.createRuntimeCall("hash32", []llvm.Value{keyPtr, size, seed}, "hash")
+		}
+		if arrayLen == 0 {
+			return llvm.ConstInt(b.ctx.Int32Type(), 0, false)
+		}
+		if arrayLen <= hashArrayUnrollLimit {
+			hash := llvm.ConstInt(b.ctx.Int32Type(), 0, false)
+			zero := llvm.ConstInt(b.ctx.Int32Type(), 0, false)
+			for i := 0; i < int(arrayLen); i++ {
+				idx := llvm.ConstInt(b.uintptrType, uint64(i), false)
+				elemPtr := b.CreateInBoundsGEP(llvmKeyType, keyPtr, []llvm.Value{zero, idx}, "")
+				elemHash := b.generateKeyHash(elemType, llvmElemType, elemPtr, seed)
+				hash = b.CreateXor(hash, elemHash, "")
+			}
+			return hash
+		}
+		initHash := llvm.ConstInt(b.ctx.Int32Type(), 0, false)
+		zero := llvm.ConstInt(b.ctx.Int32Type(), 0, false)
+
+		loopEntry := b.GetInsertBlock()
+		loopBody := b.ctx.AddBasicBlock(loopEntry.Parent(), "hash.array.body")
+		loopDone := b.ctx.AddBasicBlock(loopEntry.Parent(), "hash.array.done")
+
+		b.CreateBr(loopBody)
+		b.SetInsertPointAtEnd(loopBody)
+
+		phiI := b.CreatePHI(b.uintptrType, "i")
+		phiHash := b.CreatePHI(b.ctx.Int32Type(), "hash.acc")
+
+		elemPtr := b.CreateInBoundsGEP(llvmKeyType, keyPtr, []llvm.Value{zero, phiI}, "")
+		elemHash := b.generateKeyHash(elemType, llvmElemType, elemPtr, seed)
+		newHash := b.CreateXor(phiHash, elemHash, "")
+		nextI := b.CreateAdd(phiI, llvm.ConstInt(b.uintptrType, 1, false), "")
+		cond := b.CreateICmp(llvm.IntULT, nextI, llvm.ConstInt(b.uintptrType, uint64(arrayLen), false), "")
+		b.CreateCondBr(cond, loopBody, loopDone)
+
+		bodyEnd := b.GetInsertBlock()
+		phiI.AddIncoming([]llvm.Value{llvm.ConstInt(b.uintptrType, 0, false), nextI},
+			[]llvm.BasicBlock{loopEntry, bodyEnd})
+		phiHash.AddIncoming([]llvm.Value{initHash, newHash},
+			[]llvm.BasicBlock{loopEntry, bodyEnd})
+
+		b.SetInsertPointAtEnd(loopDone)
+		return newHash
+	default:
+		panic(fmt.Sprintf("unhandled key type for hash generation: %T", keyType))
+	}
+}
+
+// generateKeyEqual generates IR that compares two key values for equality.
+// Returns an i1 result.
+func (b *builder) generateKeyEqual(keyType types.Type, llvmKeyType llvm.Type, xPtr, yPtr llvm.Value, fn llvm.Value) llvm.Value {
+	switch keyType := keyType.Underlying().(type) {
+	case *types.Basic:
+		if keyType.Info()&types.IsString != 0 {
+			// Compare strings: load both string headers and compare.
+			xStr := b.CreateLoad(llvmKeyType, xPtr, "x.str")
+			yStr := b.CreateLoad(llvmKeyType, yPtr, "y.str")
+			return b.createRuntimeCall("stringEqual", []llvm.Value{xStr, yStr}, "eq")
+		}
+		if keyType.Info()&types.IsFloat != 0 {
+			// Float equality: fcmp oeq handles -0==+0 (true) and NaN==NaN (false).
+			xVal := b.CreateLoad(llvmKeyType, xPtr, "x.float")
+			yVal := b.CreateLoad(llvmKeyType, yPtr, "y.float")
+			return b.CreateFCmp(llvm.FloatOEQ, xVal, yVal, "eq")
+		}
+		if keyType.Info()&types.IsComplex != 0 {
+			// Complex equality: both real and imaginary parts must be equal.
+			var floatType llvm.Type
+			if keyType.Kind() == types.Complex64 {
+				floatType = b.ctx.FloatType()
+			} else {
+				floatType = b.ctx.DoubleType()
+			}
+			floatSize := b.targetData.TypeAllocSize(floatType)
+			imagOffset := llvm.ConstInt(b.uintptrType, floatSize, false)
+			// Real parts
+			xReal := b.CreateLoad(floatType, xPtr, "x.real")
+			yReal := b.CreateLoad(floatType, yPtr, "y.real")
+			realEq := b.CreateFCmp(llvm.FloatOEQ, xReal, yReal, "eq.real")
+			// Imaginary parts
+			xImagPtr := b.CreateInBoundsGEP(b.ctx.Int8Type(), xPtr, []llvm.Value{imagOffset}, "")
+			yImagPtr := b.CreateInBoundsGEP(b.ctx.Int8Type(), yPtr, []llvm.Value{imagOffset}, "")
+			xImag := b.CreateLoad(floatType, xImagPtr, "x.imag")
+			yImag := b.CreateLoad(floatType, yImagPtr, "y.imag")
+			imagEq := b.CreateFCmp(llvm.FloatOEQ, xImag, yImag, "eq.imag")
+			return b.CreateAnd(realEq, imagEq, "")
+		}
+		// Integer/boolean: compare raw bytes.
+		size := llvm.ConstInt(b.uintptrType, b.targetData.TypeAllocSize(llvmKeyType), false)
+		return b.createRuntimeCall("memequal", []llvm.Value{xPtr, yPtr, size}, "eq")
+	case *types.Pointer, *types.Chan:
+		// Pointers and channels: compare as raw pointer-sized bytes.
+		size := llvm.ConstInt(b.uintptrType, b.targetData.TypeAllocSize(llvmKeyType), false)
+		return b.createRuntimeCall("memequal", []llvm.Value{xPtr, yPtr, size}, "eq")
+	case *types.Interface:
+		// Interface: use runtime interface equality.
+		size := llvm.ConstInt(b.uintptrType, b.targetData.TypeAllocSize(llvmKeyType), false)
+		return b.createRuntimeCall("hashmapInterfaceEqual", []llvm.Value{xPtr, yPtr, size}, "eq")
+	case *types.Struct:
+		result := llvm.ConstInt(b.ctx.Int1Type(), 1, false) // start with true
+		zero := llvm.ConstInt(b.ctx.Int32Type(), 0, false)
+		for i := 0; i < keyType.NumFields(); i++ {
+			if keyType.Field(i).Name() == "_" {
+				continue // blank fields are ignored in Go equality
+			}
+			fieldType := keyType.Field(i).Type()
+			llvmFieldType := b.getLLVMType(fieldType)
+			if b.targetData.TypeAllocSize(llvmFieldType) == 0 {
+				continue // skip zero-sized fields
+			}
+			idx := llvm.ConstInt(b.ctx.Int32Type(), uint64(i), false)
+			xFieldPtr := b.CreateInBoundsGEP(llvmKeyType, xPtr, []llvm.Value{zero, idx}, "")
+			yFieldPtr := b.CreateInBoundsGEP(llvmKeyType, yPtr, []llvm.Value{zero, idx}, "")
+			fieldEq := b.generateKeyEqual(fieldType, llvmFieldType, xFieldPtr, yFieldPtr, fn)
+			result = b.CreateAnd(result, fieldEq, "")
+		}
+		return result
+	case *types.Array:
+		elemType := keyType.Elem()
+		llvmElemType := b.getLLVMType(elemType)
+		arrayLen := keyType.Len()
+		if hashmapIsBinaryKey(elemType) {
+			// All elements are binary-comparable; compare the entire array.
+			size := llvm.ConstInt(b.uintptrType, b.targetData.TypeAllocSize(llvmKeyType), false)
+			return b.createRuntimeCall("memequal", []llvm.Value{xPtr, yPtr, size}, "eq")
+		}
+		if arrayLen == 0 {
+			return llvm.ConstInt(b.ctx.Int1Type(), 1, false)
+		}
+		if arrayLen <= hashArrayUnrollLimit {
+			result := llvm.ConstInt(b.ctx.Int1Type(), 1, false)
+			zero := llvm.ConstInt(b.ctx.Int32Type(), 0, false)
+			for i := 0; i < int(arrayLen); i++ {
+				idx := llvm.ConstInt(b.uintptrType, uint64(i), false)
+				xElemPtr := b.CreateInBoundsGEP(llvmKeyType, xPtr, []llvm.Value{zero, idx}, "")
+				yElemPtr := b.CreateInBoundsGEP(llvmKeyType, yPtr, []llvm.Value{zero, idx}, "")
+				elemEq := b.generateKeyEqual(elemType, llvmElemType, xElemPtr, yElemPtr, fn)
+				result = b.CreateAnd(result, elemEq, "")
+			}
+			return result
+		}
+		zero := llvm.ConstInt(b.ctx.Int32Type(), 0, false)
+
+		loopEntry := b.GetInsertBlock()
+		loopBody := b.ctx.AddBasicBlock(loopEntry.Parent(), "eq.array.body")
+		loopDone := b.ctx.AddBasicBlock(loopEntry.Parent(), "eq.array.done")
+
+		b.CreateBr(loopBody)
+		b.SetInsertPointAtEnd(loopBody)
+
+		phiI := b.CreatePHI(b.uintptrType, "i")
+
+		xElemPtr := b.CreateInBoundsGEP(llvmKeyType, xPtr, []llvm.Value{zero, phiI}, "")
+		yElemPtr := b.CreateInBoundsGEP(llvmKeyType, yPtr, []llvm.Value{zero, phiI}, "")
+		elemEq := b.generateKeyEqual(elemType, llvmElemType, xElemPtr, yElemPtr, fn)
+
+		nextI := b.CreateAdd(phiI, llvm.ConstInt(b.uintptrType, 1, false), "")
+		atEnd := b.CreateICmp(llvm.IntUGE, nextI, llvm.ConstInt(b.uintptrType, uint64(arrayLen), false), "")
+		exitLoop := b.CreateOr(atEnd, b.CreateNot(elemEq, ""), "")
+		b.CreateCondBr(exitLoop, loopDone, loopBody)
+
+		bodyEnd := b.GetInsertBlock()
+		phiI.AddIncoming([]llvm.Value{llvm.ConstInt(b.uintptrType, 0, false), nextI},
+			[]llvm.BasicBlock{loopEntry, bodyEnd})
+
+		b.SetInsertPointAtEnd(loopDone)
+		return elemEq
+	default:
+		panic(fmt.Sprintf("unhandled key type for equal generation: %T", keyType))
+	}
 }
@@ -29,8 +29,7 @@ func (s *stdSizes) Alignof(T types.Type) int64 {
 		// is the largest of the values unsafe.Alignof(x.f) for each
 		// field f of x, but at least 1."
 		max := int64(1)
-		for i := 0; i < t.NumFields(); i++ {
-			f := t.Field(i)
+		for f := range t.Fields() {
 			if a := s.Alignof(f.Type()); a > max {
 				max = a
 			}
@@ -8,6 +8,7 @@ import (
 	"go/ast"
 	"go/token"
 	"go/types"
+	"slices"
 	"strconv"
 	"strings"

@@ -34,6 +35,7 @@ type functionInfo struct {
 	interrupt     bool       // go:interrupt
 	nobounds      bool       // go:nobounds
 	noescape      bool       // go:noescape
+	noheap        bool       // go:noheap
 	variadic      bool       // go:variadic (CGo only)
 	inline        inlineType // go:inline
 }
@@ -77,24 +79,27 @@ func (c *compilerContext) getFunction(fn *ssa.Function) (llvm.Type, llvm.Value)
 		return llvmFn.GlobalValueType(), llvmFn
 	}

-	var retType llvm.Type
-	if fn.Signature.Results() == nil {
-		retType = c.ctx.VoidType()
-	} else if fn.Signature.Results().Len() == 1 {
-		retType = c.getLLVMType(fn.Signature.Results().At(0).Type())
-	} else {
-		results := make([]llvm.Type, 0, fn.Signature.Results().Len())
-		for i := 0; i < fn.Signature.Results().Len(); i++ {
-			results = append(results, c.getLLVMType(fn.Signature.Results().At(i).Type()))
-		}
-		retType = c.ctx.StructType(results, false)
+	retType, indirectResult := c.hasIndirectResult(fn.Signature)
+	if info.exported {
+		indirectResult = false
 	}

 	var paramInfos []paramInfo
+	if indirectResult {
+		paramInfos = append(paramInfos, paramInfo{
+			llvmType: c.dataPtrType,
+			name:     "return",
+			elemSize: c.targetData.TypeAllocSize(retType),
+		})
+		retType = c.ctx.VoidType()
+	}
 	for _, param := range getParams(fn.Signature) {
 		paramType := c.getLLVMType(param.Type())
-		paramFragmentInfos := c.expandFormalParamType(paramType, param.Name(), param.Type())
-		paramInfos = append(paramInfos, paramFragmentInfos...)
+		if info.exported {
+			paramInfos = append(paramInfos, c.expandDirectFormalParamType(paramType, param.Name(), param.Type())...)
+		} else {
+			paramInfos = append(paramInfos, c.expandFormalParamType(paramType, param.Name(), param.Type())...)
+		}
 	}

 	// Add an extra parameter as the function context. This context is used in
@@ -104,12 +109,20 @@ func (c *compilerContext) getFunction(fn *ssa.Function) (llvm.Type, llvm.Value)
 	}

 	var paramTypes []llvm.Type
+	hasIndirectABI := indirectResult
 	for _, info := range paramInfos {
 		paramTypes = append(paramTypes, info.llvmType)
+		hasIndirectABI = hasIndirectABI || info.flags&paramIsIndirect != 0
 	}

 	fnType := llvm.FunctionType(retType, paramTypes, info.variadic)
 	llvmFn = llvm.AddFunction(c.mod, info.linkName, fnType)
+	if hasIndirectABI {
+		// Argument promotion only rewrites functions whose uses are all direct
+		// calls. Keep an address use so LLVM cannot reconstruct the large
+		// aggregate signature that this ABI exists to avoid.
+		llvmutil.AppendToGlobal(c.mod, "llvm.used", llvmFn)
+	}
 	if strings.HasPrefix(c.Triple, "wasm") {
 		// C functions without prototypes like this:
 		//   void foo();
@@ -139,9 +152,14 @@ func (c *compilerContext) getFunction(fn *ssa.Function) (llvm.Type, llvm.Value)
 			// not.
 			// (It may be safe to add the nocapture parameter to the context
 			// parameter, but I'd like to stay on the safe side here).
-			nocapture := c.ctx.CreateEnumAttribute(llvm.AttributeKindID("nocapture"), 0)
+			nocapture := c.ctx.CreateEnumAttribute(llvm.AttributeKindID(llvmutil.NoCaptureAttrName()), 0)
 			llvmFn.AddAttributeAtIndex(i+1, nocapture)
 		}
+		if paramInfo.flags&paramIsReadonly != 0 && paramInfo.llvmType.TypeKind() == llvm.PointerTypeKind {
+			// Readonly pointer parameters (like strings) benefit from being marked as readonly.
+			readonly := c.ctx.CreateEnumAttribute(llvm.AttributeKindID("readonly"), 0)
+			llvmFn.AddAttributeAtIndex(i+1, readonly)
+		}
 	}

 	// Set a number of function or parameter attributes, depending on the
@@ -153,8 +171,10 @@ func (c *compilerContext) getFunction(fn *ssa.Function) (llvm.Type, llvm.Value)
 		// Mark it as noreturn so LLVM can optimize away code.
 		llvmFn.AddFunctionAttr(c.ctx.CreateEnumAttribute(llvm.AttributeKindID("noreturn"), 0))
 	case "internal/abi.NoEscape":
-		llvmFn.AddAttributeAtIndex(1, c.ctx.CreateEnumAttribute(llvm.AttributeKindID("nocapture"), 0))
-	case "runtime.alloc":
+		llvmFn.AddAttributeAtIndex(1, c.ctx.CreateEnumAttribute(llvm.AttributeKindID(llvmutil.NoCaptureAttrName()), 0))
+	case "machine.keepAliveNoEscape", "machine.unsafeNoEscape":
+		llvmFn.AddAttributeAtIndex(1, c.ctx.CreateEnumAttribute(llvm.AttributeKindID(llvmutil.NoCaptureAttrName()), 0))
+	case "runtime.alloc", "runtime.alloc_noheap", "runtime.alloc_zero":
 		// Tell the optimizer that runtime.alloc is an allocator, meaning that it
 		// returns values that are never null and never alias to an existing value.
 		for _, attrName := range []string{"noalias", "nonnull"} {
@@ -175,25 +195,44 @@ func (c *compilerContext) getFunction(fn *ssa.Function) (llvm.Type, llvm.Value)
 	case "runtime.sliceAppend":
 		// Appending a slice will only read the to-be-appended slice, it won't
 		// be modified.
-		llvmFn.AddAttributeAtIndex(2, c.ctx.CreateEnumAttribute(llvm.AttributeKindID("nocapture"), 0))
+		llvmFn.AddAttributeAtIndex(2, c.ctx.CreateEnumAttribute(llvm.AttributeKindID(llvmutil.NoCaptureAttrName()), 0))
 		llvmFn.AddAttributeAtIndex(2, c.ctx.CreateEnumAttribute(llvm.AttributeKindID("readonly"), 0))
-	case "runtime.sliceCopy":
-		// Copying a slice won't capture any of the parameters.
-		llvmFn.AddAttributeAtIndex(1, c.ctx.CreateEnumAttribute(llvm.AttributeKindID("writeonly"), 0))
-		llvmFn.AddAttributeAtIndex(1, c.ctx.CreateEnumAttribute(llvm.AttributeKindID("nocapture"), 0))
-		llvmFn.AddAttributeAtIndex(2, c.ctx.CreateEnumAttribute(llvm.AttributeKindID("readonly"), 0))
-		llvmFn.AddAttributeAtIndex(2, c.ctx.CreateEnumAttribute(llvm.AttributeKindID("nocapture"), 0))
 	case "runtime.stringFromBytes":
-		llvmFn.AddAttributeAtIndex(1, c.ctx.CreateEnumAttribute(llvm.AttributeKindID("nocapture"), 0))
+		llvmFn.AddAttributeAtIndex(1, c.ctx.CreateEnumAttribute(llvm.AttributeKindID(llvmutil.NoCaptureAttrName()), 0))
 		llvmFn.AddAttributeAtIndex(1, c.ctx.CreateEnumAttribute(llvm.AttributeKindID("readonly"), 0))
 	case "runtime.stringFromRunes":
-		llvmFn.AddAttributeAtIndex(1, c.ctx.CreateEnumAttribute(llvm.AttributeKindID("nocapture"), 0))
+		llvmFn.AddAttributeAtIndex(1, c.ctx.CreateEnumAttribute(llvm.AttributeKindID(llvmutil.NoCaptureAttrName()), 0))
 		llvmFn.AddAttributeAtIndex(1, c.ctx.CreateEnumAttribute(llvm.AttributeKindID("readonly"), 0))
+	case "runtime.hashmapSet":
+		// The key (param 2) and value (param 3) pointers are only read via
+		// memcpy/hash/equal and are never captured. The indirect calls
+		// through m.keyHash and m.keyEqual function pointers prevent LLVM's
+		// functionattrs pass from inferring this automatically.
+		llvmFn.AddAttributeAtIndex(2, c.ctx.CreateEnumAttribute(llvm.AttributeKindID(llvmutil.NoCaptureAttrName()), 0))
+		llvmFn.AddAttributeAtIndex(3, c.ctx.CreateEnumAttribute(llvm.AttributeKindID(llvmutil.NoCaptureAttrName()), 0))
+	case "runtime.hashmapGet":
+		// The key (param 2) is read-only and never captured.
+		// The value (param 3) is written to (receives the result) but never captured.
+		llvmFn.AddAttributeAtIndex(2, c.ctx.CreateEnumAttribute(llvm.AttributeKindID(llvmutil.NoCaptureAttrName()), 0))
+		llvmFn.AddAttributeAtIndex(3, c.ctx.CreateEnumAttribute(llvm.AttributeKindID(llvmutil.NoCaptureAttrName()), 0))
+	case "runtime.hashmapDelete":
+		// The key (param 2) is read-only and never captured.
+		llvmFn.AddAttributeAtIndex(2, c.ctx.CreateEnumAttribute(llvm.AttributeKindID(llvmutil.NoCaptureAttrName()), 0))
+	case "runtime.hashmapGenericSet":
+		// Same as hashmapBinarySet: key (param 2) and value (param 3) are
+		// not captured.
+		llvmFn.AddAttributeAtIndex(2, c.ctx.CreateEnumAttribute(llvm.AttributeKindID(llvmutil.NoCaptureAttrName()), 0))
+		llvmFn.AddAttributeAtIndex(3, c.ctx.CreateEnumAttribute(llvm.AttributeKindID(llvmutil.NoCaptureAttrName()), 0))
+	case "runtime.hashmapGenericGet":
+		llvmFn.AddAttributeAtIndex(2, c.ctx.CreateEnumAttribute(llvm.AttributeKindID(llvmutil.NoCaptureAttrName()), 0))
+		llvmFn.AddAttributeAtIndex(3, c.ctx.CreateEnumAttribute(llvm.AttributeKindID(llvmutil.NoCaptureAttrName()), 0))
+	case "runtime.hashmapGenericDelete":
+		llvmFn.AddAttributeAtIndex(2, c.ctx.CreateEnumAttribute(llvm.AttributeKindID(llvmutil.NoCaptureAttrName()), 0))
 	case "runtime.trackPointer":
 		// This function is necessary for tracking pointers on the stack in a
 		// portable way (see gc_stack_portable.go). Indicate to the optimizer
 		// that the only thing we'll do is read the pointer.
-		llvmFn.AddAttributeAtIndex(1, c.ctx.CreateEnumAttribute(llvm.AttributeKindID("nocapture"), 0))
+		llvmFn.AddAttributeAtIndex(1, c.ctx.CreateEnumAttribute(llvm.AttributeKindID(llvmutil.NoCaptureAttrName()), 0))
 		llvmFn.AddAttributeAtIndex(1, c.ctx.CreateEnumAttribute(llvm.AttributeKindID("readonly"), 0))
 	case "__mulsi3", "__divmodsi4", "__udivmodsi4":
 		if strings.Split(c.Triple, "-")[0] == "avr" {
@@ -208,8 +247,12 @@ func (c *compilerContext) getFunction(fn *ssa.Function) (llvm.Type, llvm.Value)
 			// > circumstances, and should not be exposed to source languages.
 			llvmutil.AppendToGlobal(c.mod, "llvm.compiler.used", llvmFn)
 		}
-	case "tinygo_exitTask", "tinygo_schedulerUnlock":
-		llvmutil.AppendToGlobal(c.mod, "llvm.used", llvmFn)
+	case "GetModuleHandleExA", "GetProcAddress", "GetSystemInfo", "GetSystemTimeAsFileTime", "LoadLibraryExW", "QueryPerformanceCounter", "QueryPerformanceFrequency", "QueryUnbiasedInterruptTime", "SetEnvironmentVariableA", "Sleep", "SystemFunction036", "VirtualAlloc":
+		// On Windows we need to use a special calling convention for some
+		// external calls.
+		if c.GOOS == "windows" && c.GOARCH == "386" {
+			llvmFn.SetFunctionCallConv(llvm.X86StdcallCallConv)
+		}
 	}

 	// External/exported functions may not retain pointer values.
@@ -224,7 +267,7 @@ func (c *compilerContext) getFunction(fn *ssa.Function) (llvm.Type, llvm.Value)

 			llvmFn.AddFunctionAttr(c.ctx.CreateStringAttribute("wasm-import-name", info.wasmName))
 		}
-		nocaptureKind := llvm.AttributeKindID("nocapture")
+		nocaptureKind := llvm.AttributeKindID(llvmutil.NoCaptureAttrName())
 		nocapture := c.ctx.CreateEnumAttribute(nocaptureKind, 0)
 		for i, typ := range paramTypes {
 			if typ.TypeKind() == llvm.PointerTypeKind {
@@ -249,6 +292,23 @@ func (c *compilerContext) maybeCreateSyntheticFunction(fn *ssa.Function, llvmFn
 	// The exception is the package initializer, which does appear in the
 	// *ssa.Package members and so shouldn't be created here.
 	if fn.Synthetic != "" && fn.Synthetic != "package initializer" && fn.Synthetic != "generic function" && fn.Synthetic != "range-over-func yield" {
+		if origin := fn.Origin(); origin != nil && origin.RelString(nil) == "internal/abi.Escape" {
+			// This is a special implementation or internal/abi.Escape, which
+			// can only really be implemented in the compiler.
+			// For simplicity we'll only implement pointer parameters for now.
+			if _, ok := fn.Params[0].Type().Underlying().(*types.Pointer); ok {
+				irbuilder := c.ctx.NewBuilder()
+				defer irbuilder.Dispose()
+				b := newBuilder(c, irbuilder, fn)
+				b.createAbiEscapeImpl()
+				llvmFn.SetLinkage(llvm.LinkOnceODRLinkage)
+				llvmFn.SetUnnamedAddr(true)
+			}
+			// If the parameter is not of a pointer type, it will be left
+			// unimplemented. This will result in a linker error if the function
+			// is really called, making it clear it needs to be implemented.
+			return
+		}
 		if len(fn.Blocks) == 0 {
 			c.addError(fn.Pos(), "missing function body")
 			return
@@ -271,7 +331,7 @@ func (c *compilerContext) getFunctionInfo(f *ssa.Function) functionInfo {
 	}
 	info := functionInfo{
 		// Pick the default linkName.
-		linkName: f.RelString(nil),
+		linkName: c.canonicalFunctionName(f),
 	}

 	// Check for a few runtime functions that are treated specially.
@@ -285,6 +345,11 @@ func (c *compilerContext) getFunctionInfo(f *ssa.Function) functionInfo {
 		info.wasmName = "_start"
 		info.exported = true
 	}
+	if info.linkName == "runtime.wasmEntryLegacy" && c.BuildMode == "wasi-legacy" {
+		info.linkName = "_start"
+		info.wasmName = "_start"
+		info.exported = true
+	}

 	// Check for //go: pragmas, which may change the link name (among others).
 	c.parsePragmas(&info, f)
@@ -293,6 +358,18 @@ func (c *compilerContext) getFunctionInfo(f *ssa.Function) functionInfo {
 	return info
 }

+func (c *compilerContext) canonicalFunctionName(f *ssa.Function) string {
+	typeArgs := f.TypeArgs()
+	if len(typeArgs) == 0 {
+		return f.RelString(nil)
+	}
+	parts := make([]string, len(typeArgs))
+	for i, ta := range typeArgs {
+		parts[i], _ = c.getTypeCodeName(ta)
+	}
+	return f.Origin().RelString(nil) + "[" + strings.Join(parts, ",") + "]"
+}
+
 // parsePragmas is used by getFunctionInfo to parse function pragmas such as
 // //export or //go:noinline.
 func (c *compilerContext) parsePragmas(info *functionInfo, f *ssa.Function) {
@@ -319,6 +396,51 @@ func (c *compilerContext) parsePragmas(info *functionInfo, f *ssa.Function) {
 		}
 	}

+	// Also scan file-level //go:linkname directives. These appear as
+	// free-standing comments in *ast.File.Comments (not attached to any
+	// declaration), and are used by modern golang.org/x/sys/unix and others.
+	// Function-attached directives (above) take precedence — we only add
+	// file-level ones if no doc-comment linkname was found for this function.
+	//
+	// TODO: the hasUnsafeImport gate enforced downstream (see the
+	// //go:linkname case below) is package-level. gc enforces it per
+	// file, on the file containing the directive. For file-level
+	// linknames this is more important than for function-attached ones,
+	// because the directive can live in a file separate from the
+	// function. A stricter implementation would check whether the file
+	// returned by fileForFunc imports "unsafe", not whether any file in
+	// the package does.
+	hasFunctionLinkname := false
+	for _, comment := range pragmas {
+		if strings.HasPrefix(comment.Text, "//go:linkname ") {
+			parts := strings.Fields(comment.Text)
+			if len(parts) == 3 && parts[1] == f.Name() {
+				hasFunctionLinkname = true
+				break
+			}
+		}
+	}
+	if !hasFunctionLinkname {
+		if file := c.fileForFunc(f); file != nil {
+			for _, group := range file.Comments {
+				// Skip the function's own doc comment — already handled above.
+				if decl, ok := syntax.(*ast.FuncDecl); ok && group == decl.Doc {
+					continue
+				}
+				for _, comment := range group.List {
+					if !strings.HasPrefix(comment.Text, "//go:linkname ") {
+						continue
+					}
+					parts := strings.Fields(comment.Text)
+					if len(parts) != 3 || parts[1] != f.Name() {
+						continue
+					}
+					pragmas = append(pragmas, comment)
+				}
+			}
+		}
+	}
+
 	// Parse each pragma.
 	for _, comment := range pragmas {
 		parts := strings.Fields(comment.Text)
@@ -336,7 +458,7 @@ func (c *compilerContext) parsePragmas(info *functionInfo, f *ssa.Function) {
 			info.wasmName = info.linkName
 			info.exported = true
 		case "//go:interrupt":
-			if hasUnsafeImport(f.Pkg.Pkg) {
+			if slices.Contains(f.Pkg.Pkg.Imports(), types.Unsafe) {
 				info.interrupt = true
 			}
 		case "//go:wasm-module":
@@ -390,7 +512,7 @@ func (c *compilerContext) parsePragmas(info *functionInfo, f *ssa.Function) {
 			info.inline = inlineHint
 		case "//go:noinline":
 			info.inline = inlineNone
-		case "//go:linkname":
+		case "//go:linkname", "//go:linknamestd":
 			if len(parts) != 3 || parts[1] != f.Name() {
 				continue
 			}
@@ -398,14 +520,14 @@ func (c *compilerContext) parsePragmas(info *functionInfo, f *ssa.Function) {
 			// This is a slightly looser requirement than what gc uses: gc
 			// requires the file to import "unsafe", not the package as a
 			// whole.
-			if hasUnsafeImport(f.Pkg.Pkg) {
+			if slices.Contains(f.Pkg.Pkg.Imports(), types.Unsafe) {
 				info.linkName = parts[2]
 			}
 		case "//go:section":
 			// Only enable go:section when the package imports "unsafe".
 			// go:section also implies go:noinline since inlining could
 			// move the code to a different section than that requested.
-			if len(parts) == 2 && hasUnsafeImport(f.Pkg.Pkg) {
+			if len(parts) == 2 && slices.Contains(f.Pkg.Pkg.Imports(), types.Unsafe) {
 				info.section = parts[1]
 				info.inline = inlineNone
 			}
@@ -414,7 +536,7 @@ func (c *compilerContext) parsePragmas(info *functionInfo, f *ssa.Function) {
 			// runtime functions.
 			// This is somewhat dangerous and thus only imported in packages
 			// that import unsafe.
-			if hasUnsafeImport(f.Pkg.Pkg) {
+			if slices.Contains(f.Pkg.Pkg.Imports(), types.Unsafe) {
 				info.nobounds = true
 			}
 		case "//go:noescape":
@@ -424,18 +546,24 @@ func (c *compilerContext) parsePragmas(info *functionInfo, f *ssa.Function) {
 			if len(f.Blocks) == 0 {
 				info.noescape = true
 			}
+		case "//go:noheap":
+			// Ensure this function does not allocate on the heap.
+			info.noheap = true
 		case "//go:variadic":
 			// The //go:variadic pragma is emitted by the CGo preprocessing
 			// pass for C variadic functions. This includes both explicit
 			// (with ...) and implicit (no parameters in signature)
 			// functions.
-			if strings.HasPrefix(f.Name(), "C.") {
-				// This prefix cannot naturally be created, it must have
-				// been created as a result of CGo preprocessing.
+			if strings.HasPrefix(f.Name(), "_Cgo_") {
+				// This prefix was created as a result of CGo preprocessing.
 				info.variadic = true
 			}
 		}
 	}
+
+	if c.Nobounds {
+		info.nobounds = true
+	}
 }

 // Check whether this function can be used in //go:wasmimport or
@@ -444,7 +572,7 @@ func (c *compilerContext) parsePragmas(info *functionInfo, f *ssa.Function) {
 // The list of allowed types is based on this proposal:
 // https://github.com/golang/go/issues/59149
 func (c *compilerContext) checkWasmImportExport(f *ssa.Function, pragma string) {
-	if c.pkg.Path() == "runtime" || c.pkg.Path() == "syscall/js" || c.pkg.Path() == "syscall" {
+	if c.pkg.Path() == "runtime" || c.pkg.Path() == "syscall/js" || c.pkg.Path() == "syscall" || c.pkg.Path() == "crypto/internal/sysrand" {
 		// The runtime is a special case. Allow all kinds of parameters
 		// (importantly, including pointers).
 		return
@@ -508,9 +636,9 @@ func (c *compilerContext) isValidWasmType(typ types.Type, site wasmSite) bool {
 				hasHostLayout = false // package structs added in go1.23
 			}
 		}
-		for i := 0; i < typ.NumFields(); i++ {
-			ftyp := typ.Field(i).Type()
-			if ftyp.String() == "structs.HostLayout" {
+		for field := range typ.Fields() {
+			ftyp := field.Type()
+			if types.Unalias(ftyp).String() == "structs.HostLayout" {
 				hasHostLayout = true
 				continue
 			}
@@ -541,8 +669,8 @@ func getParams(sig *types.Signature) []*types.Var {
 	if sig.Recv() != nil {
 		params = append(params, sig.Recv())
 	}
-	for i := 0; i < sig.Params().Len(); i++ {
-		params = append(params, sig.Params().At(i))
+	for v := range sig.Params().Variables() {
+		params = append(params, v)
 	}
 	return params
 }
@@ -601,12 +729,40 @@ func (c *compilerContext) addStandardAttributes(llvmFn llvm.Value) {
 // linkName is equal to .RelString(nil) on a global and extern is false, but for
 // some symbols this is different (due to //go:extern for example).
 type globalInfo struct {
-	linkName string // go:extern
+	linkName string // go:extern, go:linkname
 	extern   bool   // go:extern
 	align    int    // go:align
 	section  string // go:section
 }

+// fileForFunc returns the *ast.File that contains the declaration of f, or
+// nil if it cannot be determined. File-level pragmas are only consulted for
+// functions in the package currently being compiled — functions imported from
+// other packages have their file-level pragmas processed when those packages
+// are compiled.
+func (c *compilerContext) fileForFunc(f *ssa.Function) *ast.File {
+	if c.loaderPkg == nil || f.Pkg == nil || f.Pkg.Pkg != c.loaderPkg.Pkg {
+		return nil
+	}
+	syntax := f.Syntax()
+	if f.Origin() != nil {
+		syntax = f.Origin().Syntax()
+	}
+	if syntax == nil {
+		return nil
+	}
+	pos := syntax.Pos()
+	if !pos.IsValid() {
+		return nil
+	}
+	for _, file := range c.loaderPkg.Files {
+		if file.FileStart <= pos && pos < file.FileEnd {
+			return file
+		}
+	}
+	return nil
+}
+
 // loadASTComments loads comments on globals from the AST, for use later in the
 // program. In particular, they are required for //go:extern pragmas on globals.
 func (c *compilerContext) loadASTComments(pkg *loader.Package) {
@@ -645,10 +801,7 @@ func (c *compilerContext) getGlobal(g *ssa.Global) llvm.Value {
 		llvmGlobal = llvm.AddGlobal(c.mod, llvmType, info.linkName)

 		// Set alignment from the //go:align comment.
-		alignment := c.targetData.ABITypeAlignment(llvmType)
-		if info.align > alignment {
-			alignment = info.align
-		}
+		alignment := max(info.align, c.targetData.ABITypeAlignment(llvmType))
 		if alignment <= 0 || alignment&(alignment-1) != 0 {
 			// Check for power-of-two (or 0).
 			// See: https://stackoverflow.com/a/108360
@@ -686,14 +839,14 @@ func (c *compilerContext) getGlobalInfo(g *ssa.Global) globalInfo {
 	// Check for //go: pragmas, which may change the link name (among others).
 	doc := c.astComments[info.linkName]
 	if doc != nil {
-		info.parsePragmas(doc)
+		info.parsePragmas(doc, c, g)
 	}
 	return info
 }

 // Parse //go: pragma comments from the source. In particular, it parses the
-// //go:extern pragma on globals.
-func (info *globalInfo) parsePragmas(doc *ast.CommentGroup) {
+// //go:extern and //go:linkname pragmas on globals.
+func (info *globalInfo) parsePragmas(doc *ast.CommentGroup, c *compilerContext, g *ssa.Global) {
 	for _, comment := range doc.List {
 		if !strings.HasPrefix(comment.Text, "//go:") {
 			continue
@@ -714,6 +867,17 @@ func (info *globalInfo) parsePragmas(doc *ast.CommentGroup) {
 			if len(parts) == 2 {
 				info.section = parts[1]
 			}
+		case "//go:linkname":
+			if len(parts) != 3 || parts[1] != g.Name() {
+				continue
+			}
+			// Only enable go:linkname when the package imports "unsafe".
+			// This is a slightly looser requirement than what gc uses: gc
+			// requires the file to import "unsafe", not the package as a
+			// whole.
+			if slices.Contains(g.Pkg.Pkg.Imports(), types.Unsafe) {
+				info.linkName = parts[2]
+			}
 		}
 	}
 }
@@ -727,13 +891,3 @@ func getAllMethods(prog *ssa.Program, typ types.Type) []*types.Selection {
 	}
 	return methods
 }
-
-// Return true if this package imports "unsafe", false otherwise.
-func hasUnsafeImport(pkg *types.Package) bool {
-	for _, imp := range pkg.Imports() {
-		if imp == types.Unsafe {
-			return true
-		}
-	}
-	return false
-}
@@ -26,24 +26,25 @@ func (b *builder) createRawSyscall(call *ssa.CallCommon) (llvm.Value, error) {
 		argTypes := []llvm.Type{b.uintptrType}
 		// Constraints will look something like:
 		//   "={rax},0,{rdi},{rsi},{rdx},{r10},{r8},{r9},~{rcx},~{r11}"
-		constraints := "={rax},0"
+		var constraints strings.Builder
+		constraints.WriteString("={rax},0")
 		for i, arg := range call.Args[1:] {
-			constraints += "," + [...]string{
+			constraints.WriteString("," + [...]string{
 				"{rdi}",
 				"{rsi}",
 				"{rdx}",
 				"{r10}",
 				"{r8}",
 				"{r9}",
-			}[i]
+			}[i])
 			llvmValue := b.getValue(arg, getPos(call))
 			args = append(args, llvmValue)
 			argTypes = append(argTypes, llvmValue.Type())
 		}
 		// rcx and r11 are clobbered by the syscall, so make sure they are not used
-		constraints += ",~{rcx},~{r11}"
+		constraints.WriteString(",~{rcx},~{r11}")
 		fnType := llvm.FunctionType(b.uintptrType, argTypes, false)
-		target := llvm.InlineAsm(fnType, "syscall", constraints, true, false, llvm.InlineAsmDialectIntel, false)
+		target := llvm.InlineAsm(fnType, "syscall", constraints.String(), true, false, llvm.InlineAsmDialectIntel, false)
 		return b.CreateCall(fnType, target, args, ""), nil

 	case b.GOARCH == "386" && b.GOOS == "linux":
@@ -55,34 +56,44 @@ func (b *builder) createRawSyscall(call *ssa.CallCommon) (llvm.Value, error) {
 		argTypes := []llvm.Type{b.uintptrType}
 		// Constraints will look something like:
 		//   "={eax},0,{ebx},{ecx},{edx},{esi},{edi},{ebp}"
-		constraints := "={eax},0"
+		var constraints strings.Builder
+		constraints.WriteString("={eax},0")
 		for i, arg := range call.Args[1:] {
-			constraints += "," + [...]string{
+			constraints.WriteString("," + [...]string{
 				"{ebx}",
 				"{ecx}",
 				"{edx}",
 				"{esi}",
 				"{edi}",
 				"{ebp}",
-			}[i]
+			}[i])
 			llvmValue := b.getValue(arg, getPos(call))
 			args = append(args, llvmValue)
 			argTypes = append(argTypes, llvmValue.Type())
 		}
 		fnType := llvm.FunctionType(b.uintptrType, argTypes, false)
-		target := llvm.InlineAsm(fnType, "int 0x80", constraints, true, false, llvm.InlineAsmDialectIntel, false)
+		target := llvm.InlineAsm(fnType, "int 0x80", constraints.String(), true, false, llvm.InlineAsmDialectIntel, false)
 		return b.CreateCall(fnType, target, args, ""), nil

 	case b.GOARCH == "arm" && b.GOOS == "linux":
+		if arch := b.archFamily(); arch != "arm" {
+			// Some targets pretend to be linux/arm for compatibility but aren't
+			// actually such a system. Make sure we emit an error instead of
+			// creating inline assembly that will fail to compile.
+			// See: https://github.com/tinygo-org/tinygo/issues/4959
+			return llvm.Value{}, b.makeError(call.Pos(), "system calls are not supported: target emulates a linux/arm system on "+arch)
+		}
+
 		// Implement the EABI system call convention for Linux.
 		// Source: syscall(2) man page.
 		args := []llvm.Value{}
 		argTypes := []llvm.Type{}
 		// Constraints will look something like:
 		//   ={r0},0,{r1},{r2},{r7},~{r3}
-		constraints := "={r0}"
+		var constraints strings.Builder
+		constraints.WriteString("={r0}")
 		for i, arg := range call.Args[1:] {
-			constraints += "," + [...]string{
+			constraints.WriteString("," + [...]string{
 				"0", // tie to output
 				"{r1}",
 				"{r2}",
@@ -90,20 +101,20 @@ func (b *builder) createRawSyscall(call *ssa.CallCommon) (llvm.Value, error) {
 				"{r4}",
 				"{r5}",
 				"{r6}",
-			}[i]
+			}[i])
 			llvmValue := b.getValue(arg, getPos(call))
 			args = append(args, llvmValue)
 			argTypes = append(argTypes, llvmValue.Type())
 		}
 		args = append(args, num)
 		argTypes = append(argTypes, b.uintptrType)
-		constraints += ",{r7}" // syscall number
+		constraints.WriteString(",{r7}") // syscall number
 		for i := len(call.Args) - 1; i < 4; i++ {
 			// r0-r3 get clobbered after the syscall returns
-			constraints += ",~{r" + strconv.Itoa(i) + "}"
+			constraints.WriteString(",~{r" + strconv.Itoa(i) + "}")
 		}
 		fnType := llvm.FunctionType(b.uintptrType, argTypes, false)
-		target := llvm.InlineAsm(fnType, "svc #0", constraints, true, false, 0, false)
+		target := llvm.InlineAsm(fnType, "svc #0", constraints.String(), true, false, 0, false)
 		return b.CreateCall(fnType, target, args, ""), nil

 	case b.GOARCH == "arm64" && b.GOOS == "linux":
@@ -112,31 +123,32 @@ func (b *builder) createRawSyscall(call *ssa.CallCommon) (llvm.Value, error) {
 		argTypes := []llvm.Type{}
 		// Constraints will look something like:
 		//   ={x0},0,{x1},{x2},{x8},~{x3},~{x4},~{x5},~{x6},~{x7},~{x16},~{x17}
-		constraints := "={x0}"
+		var constraints strings.Builder
+		constraints.WriteString("={x0}")
 		for i, arg := range call.Args[1:] {
-			constraints += "," + [...]string{
+			constraints.WriteString("," + [...]string{
 				"0", // tie to output
 				"{x1}",
 				"{x2}",
 				"{x3}",
 				"{x4}",
 				"{x5}",
-			}[i]
+			}[i])
 			llvmValue := b.getValue(arg, getPos(call))
 			args = append(args, llvmValue)
 			argTypes = append(argTypes, llvmValue.Type())
 		}
 		args = append(args, num)
 		argTypes = append(argTypes, b.uintptrType)
-		constraints += ",{x8}" // syscall number
+		constraints.WriteString(",{x8}") // syscall number
 		for i := len(call.Args) - 1; i < 8; i++ {
 			// x0-x7 may get clobbered during the syscall following the aarch64
 			// calling convention.
-			constraints += ",~{x" + strconv.Itoa(i) + "}"
+			constraints.WriteString(",~{x" + strconv.Itoa(i) + "}")
 		}
-		constraints += ",~{x16},~{x17}" // scratch registers
+		constraints.WriteString(",~{x16},~{x17}") // scratch registers
 		fnType := llvm.FunctionType(b.uintptrType, argTypes, false)
-		target := llvm.InlineAsm(fnType, "svc #0", constraints, true, false, 0, false)
+		target := llvm.InlineAsm(fnType, "svc #0", constraints.String(), true, false, 0, false)
 		return b.CreateCall(fnType, target, args, ""), nil

 	case (b.GOARCH == "mips" || b.GOARCH == "mipsle") && b.GOOS == "linux":
@@ -155,7 +167,8 @@ func (b *builder) createRawSyscall(call *ssa.CallCommon) (llvm.Value, error) {
 		// faster and smaller code.
 		args := []llvm.Value{num}
 		argTypes := []llvm.Type{b.uintptrType}
-		constraints := "={$2},={$7},0"
+		var constraints strings.Builder
+		constraints.WriteString("={$2},={$7},0")
 		syscallParams := call.Args[1:]
 		if len(syscallParams) > 7 {
 			// There is one syscall that uses 7 parameters: sync_file_range.
@@ -164,7 +177,7 @@ func (b *builder) createRawSyscall(call *ssa.CallCommon) (llvm.Value, error) {
 			syscallParams = syscallParams[:7]
 		}
 		for i, arg := range syscallParams {
-			constraints += "," + [...]string{
+			constraints.WriteString("," + [...]string{
 				"{$4}", // arg1
 				"{$5}", // arg2
 				"{$6}", // arg3
@@ -172,7 +185,7 @@ func (b *builder) createRawSyscall(call *ssa.CallCommon) (llvm.Value, error) {
 				"r",    // arg5 on the stack
 				"r",    // arg6 on the stack
 				"r",    // arg7 on the stack
-			}[i]
+			}[i])
 			llvmValue := b.getValue(arg, getPos(call))
 			args = append(args, llvmValue)
 			argTypes = append(argTypes, llvmValue.Type())
@@ -213,10 +226,10 @@ func (b *builder) createRawSyscall(call *ssa.CallCommon) (llvm.Value, error) {
 				"addu $$sp, $$sp, 32\n" +
 				".set at\n"
 		}
-		constraints += ",~{$3},~{$4},~{$5},~{$6},~{$8},~{$9},~{$10},~{$11},~{$12},~{$13},~{$14},~{$15},~{$24},~{$25},~{hi},~{lo},~{memory}"
+		constraints.WriteString(",~{$3},~{$4},~{$5},~{$6},~{$8},~{$9},~{$10},~{$11},~{$12},~{$13},~{$14},~{$15},~{$24},~{$25},~{hi},~{lo},~{memory}")
 		returnType := b.ctx.StructType([]llvm.Type{b.uintptrType, b.uintptrType}, false)
 		fnType := llvm.FunctionType(returnType, argTypes, false)
-		target := llvm.InlineAsm(fnType, asm, constraints, true, true, 0, false)
+		target := llvm.InlineAsm(fnType, asm, constraints.String(), true, true, 0, false)
 		call := b.CreateCall(fnType, target, args, "")
 		resultCode := b.CreateExtractValue(call, 0, "") // r2
 		errorFlag := b.CreateExtractValue(call, 1, "")  // r7
@@ -268,6 +281,8 @@ func (b *builder) createSyscall(call *ssa.CallCommon) (llvm.Value, error) {
 		// The signature looks like this:
 		//   func Syscall(trap, nargs, a1, a2, a3 uintptr) (r1, r2 uintptr, err Errno)

+		isI386 := strings.HasPrefix(b.Triple, "i386-")
+
 		// Prepare input values.
 		var paramTypes []llvm.Type
 		var params []llvm.Value
@@ -285,11 +300,17 @@ func (b *builder) createSyscall(call *ssa.CallCommon) (llvm.Value, error) {
 		if setLastError.IsNil() {
 			llvmType := llvm.FunctionType(b.ctx.VoidType(), []llvm.Type{b.ctx.Int32Type()}, false)
 			setLastError = llvm.AddFunction(b.mod, "SetLastError", llvmType)
+			if isI386 {
+				setLastError.SetFunctionCallConv(llvm.X86StdcallCallConv)
+			}
 		}
 		getLastError := b.mod.NamedFunction("GetLastError")
 		if getLastError.IsNil() {
 			llvmType := llvm.FunctionType(b.ctx.Int32Type(), nil, false)
 			getLastError = llvm.AddFunction(b.mod, "GetLastError", llvmType)
+			if isI386 {
+				getLastError.SetFunctionCallConv(llvm.X86StdcallCallConv)
+			}
 		}

 		// Now do the actual call. Pseudocode:
@@ -300,9 +321,24 @@ func (b *builder) createSyscall(call *ssa.CallCommon) (llvm.Value, error) {
 		// Note that SetLastError/GetLastError could be replaced with direct
 		// access to the thread control block, which is probably smaller and
 		// faster. The Go runtime does this in assembly.
-		b.CreateCall(setLastError.GlobalValueType(), setLastError, []llvm.Value{llvm.ConstNull(b.ctx.Int32Type())}, "")
+		// On windows/386, we also need to save/restore the stack pointer. I'm
+		// not entirely sure why this is needed, but without it these calls
+		// change the stack pointer leading to a crash soon after.
+		setLastErrorCall := b.CreateCall(setLastError.GlobalValueType(), setLastError, []llvm.Value{llvm.ConstNull(b.ctx.Int32Type())}, "")
+		var sp llvm.Value
+		if isI386 {
+			setLastErrorCall.SetInstructionCallConv(llvm.X86StdcallCallConv)
+			sp = b.readStackPointer()
+		}
 		syscallResult := b.CreateCall(llvmType, fnPtr, params, "")
+		if isI386 {
+			syscallResult.SetInstructionCallConv(llvm.X86StdcallCallConv)
+			b.writeStackPointer(sp)
+		}
 		errResult := b.CreateCall(getLastError.GlobalValueType(), getLastError, nil, "err")
+		if isI386 {
+			errResult.SetInstructionCallConv(llvm.X86StdcallCallConv)
+		}
 		if b.uintptrType != b.ctx.Int32Type() {
 			errResult = b.CreateZExt(errResult, b.uintptrType, "err.uintptr")
 		}
@@ -318,6 +354,130 @@ func (b *builder) createSyscall(call *ssa.CallCommon) (llvm.Value, error) {
 	}
 }

+// createSyscalln emits instructions for the syscall.syscalln function on
+// Windows. This handles the variadic calling convention used in Go 1.26+:
+//
+//	func syscalln(fn, n uintptr, args ...uintptr) (r1, r2 uintptr, err Errno)
+//
+// The function generates a switch on n to dispatch to the correct fixed-argument
+// function pointer call with SetLastError(0)/GetLastError() wrapping.
+func (b *builder) createSyscalln(call *ssa.CallCommon) (llvm.Value, error) {
+	const maxArgs = 18 // Windows syscalls support up to 18 args
+
+	isI386 := strings.HasPrefix(b.Triple, "i386-")
+
+	// Get the function pointer (call.Args[0]) and n (call.Args[1]).
+	fn := b.getValue(call.Args[0], getPos(call))
+	fnPtr := b.CreateIntToPtr(fn, b.dataPtrType, "")
+	n := b.getValue(call.Args[1], getPos(call))
+
+	// Get the variadic args slice (call.Args[2]).
+	// In SSA, the variadic slice is the third argument.
+	var argsPtr llvm.Value
+	if len(call.Args) > 2 {
+		argsSlice := b.getValue(call.Args[2], getPos(call))
+		argsPtr = b.CreateExtractValue(argsSlice, 0, "args.data")
+	} else {
+		argsPtr = llvm.ConstNull(b.dataPtrType)
+	}
+
+	// Prepare SetLastError and GetLastError.
+	setLastError := b.mod.NamedFunction("SetLastError")
+	if setLastError.IsNil() {
+		llvmType := llvm.FunctionType(b.ctx.VoidType(), []llvm.Type{b.ctx.Int32Type()}, false)
+		setLastError = llvm.AddFunction(b.mod, "SetLastError", llvmType)
+		if isI386 {
+			setLastError.SetFunctionCallConv(llvm.X86StdcallCallConv)
+		}
+	}
+	getLastError := b.mod.NamedFunction("GetLastError")
+	if getLastError.IsNil() {
+		llvmType := llvm.FunctionType(b.ctx.Int32Type(), nil, false)
+		getLastError = llvm.AddFunction(b.mod, "GetLastError", llvmType)
+		if isI386 {
+			getLastError.SetFunctionCallConv(llvm.X86StdcallCallConv)
+		}
+	}
+
+	retType := b.ctx.StructType([]llvm.Type{b.uintptrType, b.uintptrType, b.uintptrType}, false)
+
+	// Create the merge block where all cases converge.
+	mergeBB := b.insertBasicBlock("syscalln.merge")
+
+	// Create the default (panic) block.
+	panicBB := b.insertBasicBlock("syscalln.panic")
+
+	// Create the switch on n.
+	sw := b.CreateSwitch(n, panicBB, maxArgs+1)
+
+	// We'll collect blocks and values for the PHI node.
+	var incomingVals []llvm.Value
+	var incomingBlocks []llvm.BasicBlock
+
+	// Generate a case for each arg count 0..maxArgs.
+	for i := 0; i <= maxArgs; i++ {
+		caseBB := b.insertBasicBlock("syscalln.case" + strconv.Itoa(i))
+		sw.AddCase(llvm.ConstInt(b.uintptrType, uint64(i), false), caseBB)
+		b.SetInsertPointAtEnd(caseBB)
+
+		// Load args[0] through args[i-1] from the slice data pointer.
+		var params []llvm.Value
+		var paramTypes []llvm.Type
+		for j := 0; j < i; j++ {
+			gep := b.CreateInBoundsGEP(b.uintptrType, argsPtr, []llvm.Value{
+				llvm.ConstInt(b.ctx.Int32Type(), uint64(j), false),
+			}, "")
+			arg := b.CreateLoad(b.uintptrType, gep, "")
+			params = append(params, arg)
+			paramTypes = append(paramTypes, b.uintptrType)
+		}
+
+		// SetLastError(0)
+		setCall := b.CreateCall(setLastError.GlobalValueType(), setLastError, []llvm.Value{llvm.ConstNull(b.ctx.Int32Type())}, "")
+		var sp llvm.Value
+		if isI386 {
+			setCall.SetInstructionCallConv(llvm.X86StdcallCallConv)
+			sp = b.readStackPointer()
+		}
+
+		// Call fn(args...)
+		fnType := llvm.FunctionType(b.uintptrType, paramTypes, false)
+		syscallResult := b.CreateCall(fnType, fnPtr, params, "")
+		if isI386 {
+			syscallResult.SetInstructionCallConv(llvm.X86StdcallCallConv)
+			b.writeStackPointer(sp)
+		}
+
+		// err = GetLastError()
+		errResult := b.CreateCall(getLastError.GlobalValueType(), getLastError, nil, "err")
+		if isI386 {
+			errResult.SetInstructionCallConv(llvm.X86StdcallCallConv)
+		}
+		if b.uintptrType != b.ctx.Int32Type() {
+			errResult = b.CreateZExt(errResult, b.uintptrType, "err.uintptr")
+		}
+
+		// Build {r1, 0, err}
+		result := llvm.ConstNull(retType)
+		result = b.CreateInsertValue(result, syscallResult, 0, "")
+		result = b.CreateInsertValue(result, errResult, 2, "")
+
+		incomingVals = append(incomingVals, result)
+		incomingBlocks = append(incomingBlocks, b.Builder.GetInsertBlock())
+		b.CreateBr(mergeBB)
+	}
+
+	// Panic block for n > maxArgs.
+	b.SetInsertPointAtEnd(panicBB)
+	b.CreateUnreachable()
+
+	// Merge block: PHI node to select the result.
+	b.SetInsertPointAtEnd(mergeBB)
+	phi := b.CreatePHI(retType, "syscalln.result")
+	phi.AddIncoming(incomingVals, incomingBlocks)
+	return phi, nil
+}
+
 // createRawSyscallNoError emits instructions for the Linux-specific
 // syscall.rawSyscallNoError function.
 func (b *builder) createRawSyscallNoError(call *ssa.CallCommon) (llvm.Value, error) {
@@ -66,6 +66,11 @@ func complexSub(x, y complex64) complex64 {
 	return x - y
 }

+func shiftNested(x uint64) uint64 {
+	k := 3
+	return x >> (1 << k) // https://github.com/tinygo-org/tinygo/issues/5496
+}
+
 func complexMul(x, y complex64) complex64 {
 	return x * y
 }
@@ -1,6 +1,6 @@
 ; ModuleID = 'basic.go'
 source_filename = "basic.go"
-target datalayout = "e-m:e-p:32:32-p10:8:8-p20:8:8-i64:64-n32:64-S128-ni:1:10:20"
+target datalayout = "e-m:e-p:32:32-p10:8:8-p20:8:8-i64:64-i128:128-n32:64-S128-ni:1:10:20"
 target triple = "wasm32-unknown-wasi"

 %main.kv = type { float, i32, i32, i32 }
@@ -10,33 +10,30 @@ target triple = "wasm32-unknown-wasi"
@main.a = hidden global { ptr, i32, i32 } zeroinitializer, align 4
@main.b = hidden global [2 x ptr] zeroinitializer, align 4

-; Function Attrs: allockind("alloc,zeroed") allocsize(0)
-declare noalias nonnull ptr @runtime.alloc(i32, ptr, ptr) #0
-
-declare void @runtime.trackPointer(ptr nocapture readonly, ptr, ptr) #1
+declare void @runtime.trackPointer(ptr nocapture readonly, ptr, ptr) #0

 ; Function Attrs: nounwind
-define hidden void @main.init(ptr %context) unnamed_addr #2 {
+define hidden void @main.init(ptr %context) unnamed_addr #1 {
 entry:
  ret void
 }

 ; Function Attrs: nounwind
-define hidden i32 @main.addInt(i32 %x, i32 %y, ptr %context) unnamed_addr #2 {
+define hidden i32 @main.addInt(i32 %x, i32 %y, ptr %context) unnamed_addr #1 {
 entry:
  %0 = add i32 %x, %y
  ret i32 %0
 }

 ; Function Attrs: nounwind
-define hidden i1 @main.equalInt(i32 %x, i32 %y, ptr %context) unnamed_addr #2 {
+define hidden i1 @main.equalInt(i32 %x, i32 %y, ptr %context) unnamed_addr #1 {
 entry:
  %0 = icmp eq i32 %x, %y
  ret i1 %0
 }

 ; Function Attrs: nounwind
-define hidden i32 @main.divInt(i32 %x, i32 %y, ptr %context) unnamed_addr #2 {
+define hidden i32 @main.divInt(i32 %x, i32 %y, ptr %context) unnamed_addr #1 {
 entry:
  %0 = icmp eq i32 %y, 0
  br i1 %0, label %divbyzero.throw, label %divbyzero.next
@@ -50,14 +47,14 @@ divbyzero.next:                                   ; preds = %entry
  ret i32 %5

 divbyzero.throw:                                  ; preds = %entry
-  call void @runtime.divideByZeroPanic(ptr undef) #3
+  call void @runtime.divideByZeroPanic(ptr undef) #2
  unreachable
 }

-declare void @runtime.divideByZeroPanic(ptr) #1
+declare void @runtime.divideByZeroPanic(ptr) #0

 ; Function Attrs: nounwind
-define hidden i32 @main.divUint(i32 %x, i32 %y, ptr %context) unnamed_addr #2 {
+define hidden i32 @main.divUint(i32 %x, i32 %y, ptr %context) unnamed_addr #1 {
 entry:
  %0 = icmp eq i32 %y, 0
  br i1 %0, label %divbyzero.throw, label %divbyzero.next
@@ -67,12 +64,12 @@ divbyzero.next:                                   ; preds = %entry
  ret i32 %1

 divbyzero.throw:                                  ; preds = %entry
-  call void @runtime.divideByZeroPanic(ptr undef) #3
+  call void @runtime.divideByZeroPanic(ptr undef) #2
  unreachable
 }

 ; Function Attrs: nounwind
-define hidden i32 @main.remInt(i32 %x, i32 %y, ptr %context) unnamed_addr #2 {
+define hidden i32 @main.remInt(i32 %x, i32 %y, ptr %context) unnamed_addr #1 {
 entry:
  %0 = icmp eq i32 %y, 0
  br i1 %0, label %divbyzero.throw, label %divbyzero.next
@@ -86,12 +83,12 @@ divbyzero.next:                                   ; preds = %entry
  ret i32 %5

 divbyzero.throw:                                  ; preds = %entry
-  call void @runtime.divideByZeroPanic(ptr undef) #3
+  call void @runtime.divideByZeroPanic(ptr undef) #2
  unreachable
 }

 ; Function Attrs: nounwind
-define hidden i32 @main.remUint(i32 %x, i32 %y, ptr %context) unnamed_addr #2 {
+define hidden i32 @main.remUint(i32 %x, i32 %y, ptr %context) unnamed_addr #1 {
 entry:
  %0 = icmp eq i32 %y, 0
  br i1 %0, label %divbyzero.throw, label %divbyzero.next
@@ -101,66 +98,66 @@ divbyzero.next:                                   ; preds = %entry
  ret i32 %1

 divbyzero.throw:                                  ; preds = %entry
-  call void @runtime.divideByZeroPanic(ptr undef) #3
+  call void @runtime.divideByZeroPanic(ptr undef) #2
  unreachable
 }

 ; Function Attrs: nounwind
-define hidden i1 @main.floatEQ(float %x, float %y, ptr %context) unnamed_addr #2 {
+define hidden i1 @main.floatEQ(float %x, float %y, ptr %context) unnamed_addr #1 {
 entry:
  %0 = fcmp oeq float %x, %y
  ret i1 %0
 }

 ; Function Attrs: nounwind
-define hidden i1 @main.floatNE(float %x, float %y, ptr %context) unnamed_addr #2 {
+define hidden i1 @main.floatNE(float %x, float %y, ptr %context) unnamed_addr #1 {
 entry:
  %0 = fcmp une float %x, %y
  ret i1 %0
 }

 ; Function Attrs: nounwind
-define hidden i1 @main.floatLower(float %x, float %y, ptr %context) unnamed_addr #2 {
+define hidden i1 @main.floatLower(float %x, float %y, ptr %context) unnamed_addr #1 {
 entry:
  %0 = fcmp olt float %x, %y
  ret i1 %0
 }

 ; Function Attrs: nounwind
-define hidden i1 @main.floatLowerEqual(float %x, float %y, ptr %context) unnamed_addr #2 {
+define hidden i1 @main.floatLowerEqual(float %x, float %y, ptr %context) unnamed_addr #1 {
 entry:
  %0 = fcmp ole float %x, %y
  ret i1 %0
 }

 ; Function Attrs: nounwind
-define hidden i1 @main.floatGreater(float %x, float %y, ptr %context) unnamed_addr #2 {
+define hidden i1 @main.floatGreater(float %x, float %y, ptr %context) unnamed_addr #1 {
 entry:
  %0 = fcmp ogt float %x, %y
  ret i1 %0
 }

 ; Function Attrs: nounwind
-define hidden i1 @main.floatGreaterEqual(float %x, float %y, ptr %context) unnamed_addr #2 {
+define hidden i1 @main.floatGreaterEqual(float %x, float %y, ptr %context) unnamed_addr #1 {
 entry:
  %0 = fcmp oge float %x, %y
  ret i1 %0
 }

 ; Function Attrs: nounwind
-define hidden float @main.complexReal(float %x.r, float %x.i, ptr %context) unnamed_addr #2 {
+define hidden float @main.complexReal(float %x.r, float %x.i, ptr %context) unnamed_addr #1 {
 entry:
  ret float %x.r
 }

 ; Function Attrs: nounwind
-define hidden float @main.complexImag(float %x.r, float %x.i, ptr %context) unnamed_addr #2 {
+define hidden float @main.complexImag(float %x.r, float %x.i, ptr %context) unnamed_addr #1 {
 entry:
  ret float %x.i
 }

 ; Function Attrs: nounwind
-define hidden { float, float } @main.complexAdd(float %x.r, float %x.i, float %y.r, float %y.i, ptr %context) unnamed_addr #2 {
+define hidden { float, float } @main.complexAdd(float %x.r, float %x.i, float %y.r, float %y.i, ptr %context) unnamed_addr #1 {
 entry:
  %0 = fadd float %x.r, %y.r
  %1 = fadd float %x.i, %y.i
@@ -170,7 +167,7 @@ entry:
 }

 ; Function Attrs: nounwind
-define hidden { float, float } @main.complexSub(float %x.r, float %x.i, float %y.r, float %y.i, ptr %context) unnamed_addr #2 {
+define hidden { float, float } @main.complexSub(float %x.r, float %x.i, float %y.r, float %y.i, ptr %context) unnamed_addr #1 {
 entry:
  %0 = fsub float %x.r, %y.r
  %1 = fsub float %x.i, %y.i
@@ -180,7 +177,14 @@ entry:
 }

 ; Function Attrs: nounwind
-define hidden { float, float } @main.complexMul(float %x.r, float %x.i, float %y.r, float %y.i, ptr %context) unnamed_addr #2 {
+define hidden i64 @main.shiftNested(i64 %x, ptr %context) unnamed_addr #1 {
+entry:
+  %0 = lshr i64 %x, 8
+  ret i64 %0
+}
+
+; Function Attrs: nounwind
+define hidden { float, float } @main.complexMul(float %x.r, float %x.i, float %y.r, float %y.i, ptr %context) unnamed_addr #1 {
 entry:
  %0 = fmul float %x.r, %y.r
  %1 = fmul float %x.i, %y.i
@@ -194,19 +198,18 @@ entry:
 }

 ; Function Attrs: nounwind
-define hidden void @main.foo(ptr %context) unnamed_addr #2 {
+define hidden void @main.foo(ptr %context) unnamed_addr #1 {
 entry:
  call void @"main.foo$1"(%main.kv.0 zeroinitializer, ptr undef)
  ret void
 }

 ; Function Attrs: nounwind
-define internal void @"main.foo$1"(%main.kv.0 %b, ptr %context) unnamed_addr #2 {
+define internal void @"main.foo$1"(%main.kv.0 %b, ptr %context) unnamed_addr #1 {
 entry:
  ret void
 }

-attributes #0 = { allockind("alloc,zeroed") allocsize(0) "alloc-family"="runtime.alloc" "target-features"="+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" }
-attributes #1 = { "target-features"="+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" }
-attributes #2 = { nounwind "target-features"="+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" }
-attributes #3 = { nounwind }
+attributes #0 = { "target-features"="+bulk-memory,+bulk-memory-opt,+call-indirect-overlong,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" }
+attributes #1 = { nounwind "target-features"="+bulk-memory,+bulk-memory-opt,+call-indirect-overlong,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" }
+attributes #2 = { nounwind }
@@ -1,94 +1,91 @@
 ; ModuleID = 'channel.go'
 source_filename = "channel.go"
-target datalayout = "e-m:e-p:32:32-p10:8:8-p20:8:8-i64:64-n32:64-S128-ni:1:10:20"
+target datalayout = "e-m:e-p:32:32-p10:8:8-p20:8:8-i64:64-i128:128-n32:64-S128-ni:1:10:20"
 target triple = "wasm32-unknown-wasi"

 %runtime.channelOp = type { ptr, ptr, i32, ptr }
 %runtime.chanSelectState = type { ptr, ptr }

-; Function Attrs: allockind("alloc,zeroed") allocsize(0)
-declare noalias nonnull ptr @runtime.alloc(i32, ptr, ptr) #0
-
-declare void @runtime.trackPointer(ptr nocapture readonly, ptr, ptr) #1
+declare void @runtime.trackPointer(ptr nocapture readonly, ptr, ptr) #0

 ; Function Attrs: nounwind
-define hidden void @main.init(ptr %context) unnamed_addr #2 {
+define hidden void @main.init(ptr %context) unnamed_addr #1 {
 entry:
  ret void
 }

 ; Function Attrs: nounwind
-define hidden void @main.chanIntSend(ptr dereferenceable_or_null(36) %ch, ptr %context) unnamed_addr #2 {
+define hidden void @main.chanIntSend(ptr dereferenceable_or_null(36) %ch, ptr %context) unnamed_addr #1 {
 entry:
  %chan.op = alloca %runtime.channelOp, align 8
  %chan.value = alloca i32, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %chan.value)
  store i32 3, ptr %chan.value, align 4
  call void @llvm.lifetime.start.p0(i64 16, ptr nonnull %chan.op)
-  call void @runtime.chanSend(ptr %ch, ptr nonnull %chan.value, ptr nonnull %chan.op, ptr undef) #4
+  call void @runtime.chanSend(ptr %ch, ptr nonnull %chan.value, ptr nonnull %chan.op, ptr undef) #3
  call void @llvm.lifetime.end.p0(i64 16, ptr nonnull %chan.op)
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %chan.value)
  ret void
 }

 ; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
-declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #3
+declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #2

-declare void @runtime.chanSend(ptr dereferenceable_or_null(36), ptr, ptr dereferenceable_or_null(16), ptr) #1
+declare void @runtime.chanSend(ptr dereferenceable_or_null(36), ptr, ptr dereferenceable_or_null(16), ptr) #0

 ; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
-declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #3
+declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #2

 ; Function Attrs: nounwind
-define hidden void @main.chanIntRecv(ptr dereferenceable_or_null(36) %ch, ptr %context) unnamed_addr #2 {
+define hidden void @main.chanIntRecv(ptr dereferenceable_or_null(36) %ch, ptr %context) unnamed_addr #1 {
 entry:
  %chan.op = alloca %runtime.channelOp, align 8
  %chan.value = alloca i32, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %chan.value)
  call void @llvm.lifetime.start.p0(i64 16, ptr nonnull %chan.op)
-  %0 = call i1 @runtime.chanRecv(ptr %ch, ptr nonnull %chan.value, ptr nonnull %chan.op, ptr undef) #4
+  %0 = call i1 @runtime.chanRecv(ptr %ch, ptr nonnull %chan.value, ptr nonnull %chan.op, ptr undef) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %chan.value)
  call void @llvm.lifetime.end.p0(i64 16, ptr nonnull %chan.op)
  ret void
 }

-declare i1 @runtime.chanRecv(ptr dereferenceable_or_null(36), ptr, ptr dereferenceable_or_null(16), ptr) #1
+declare i1 @runtime.chanRecv(ptr dereferenceable_or_null(36), ptr, ptr dereferenceable_or_null(16), ptr) #0

 ; Function Attrs: nounwind
-define hidden void @main.chanZeroSend(ptr dereferenceable_or_null(36) %ch, ptr %context) unnamed_addr #2 {
+define hidden void @main.chanZeroSend(ptr dereferenceable_or_null(36) %ch, ptr %context) unnamed_addr #1 {
 entry:
  %chan.op = alloca %runtime.channelOp, align 8
  call void @llvm.lifetime.start.p0(i64 16, ptr nonnull %chan.op)
-  call void @runtime.chanSend(ptr %ch, ptr null, ptr nonnull %chan.op, ptr undef) #4
+  call void @runtime.chanSend(ptr %ch, ptr null, ptr nonnull %chan.op, ptr undef) #3
  call void @llvm.lifetime.end.p0(i64 16, ptr nonnull %chan.op)
  ret void
 }

 ; Function Attrs: nounwind
-define hidden void @main.chanZeroRecv(ptr dereferenceable_or_null(36) %ch, ptr %context) unnamed_addr #2 {
+define hidden void @main.chanZeroRecv(ptr dereferenceable_or_null(36) %ch, ptr %context) unnamed_addr #1 {
 entry:
  %chan.op = alloca %runtime.channelOp, align 8
  call void @llvm.lifetime.start.p0(i64 16, ptr nonnull %chan.op)
-  %0 = call i1 @runtime.chanRecv(ptr %ch, ptr null, ptr nonnull %chan.op, ptr undef) #4
+  %0 = call i1 @runtime.chanRecv(ptr %ch, ptr null, ptr nonnull %chan.op, ptr undef) #3
  call void @llvm.lifetime.end.p0(i64 16, ptr nonnull %chan.op)
  ret void
 }

 ; Function Attrs: nounwind
-define hidden void @main.selectZeroRecv(ptr dereferenceable_or_null(36) %ch1, ptr dereferenceable_or_null(36) %ch2, ptr %context) unnamed_addr #2 {
+define hidden void @main.selectZeroRecv(ptr dereferenceable_or_null(36) %ch1, ptr dereferenceable_or_null(36) %ch2, ptr %context) unnamed_addr #1 {
 entry:
  %select.states.alloca = alloca [2 x %runtime.chanSelectState], align 8
  %select.send.value = alloca i32, align 4
  store i32 1, ptr %select.send.value, align 4
  call void @llvm.lifetime.start.p0(i64 16, ptr nonnull %select.states.alloca)
  store ptr %ch1, ptr %select.states.alloca, align 4
-  %select.states.alloca.repack1 = getelementptr inbounds i8, ptr %select.states.alloca, i32 4
+  %select.states.alloca.repack1 = getelementptr inbounds nuw i8, ptr %select.states.alloca, i32 4
  store ptr %select.send.value, ptr %select.states.alloca.repack1, align 4
-  %0 = getelementptr inbounds i8, ptr %select.states.alloca, i32 8
+  %0 = getelementptr inbounds nuw i8, ptr %select.states.alloca, i32 8
  store ptr %ch2, ptr %0, align 4
-  %.repack3 = getelementptr inbounds i8, ptr %select.states.alloca, i32 12
+  %.repack3 = getelementptr inbounds nuw i8, ptr %select.states.alloca, i32 12
  store ptr null, ptr %.repack3, align 4
-  %select.result = call { i32, i1 } @runtime.chanSelect(ptr undef, ptr nonnull %select.states.alloca, i32 2, i32 2, ptr null, i32 0, i32 0, ptr undef) #4
+  %select.result = call { i32, i1 } @runtime.chanSelect(ptr undef, ptr nonnull %select.states.alloca, i32 2, i32 2, ptr null, i32 0, i32 0, ptr undef) #3
  call void @llvm.lifetime.end.p0(i64 16, ptr nonnull %select.states.alloca)
  %1 = extractvalue { i32, i1 } %select.result, 0
  %2 = icmp eq i32 %1, 0
@@ -105,10 +102,9 @@ select.body:                                      ; preds = %select.next
  br label %select.done
 }

-declare { i32, i1 } @runtime.chanSelect(ptr, ptr, i32, i32, ptr, i32, i32, ptr) #1
+declare { i32, i1 } @runtime.chanSelect(ptr, ptr, i32, i32, ptr, i32, i32, ptr) #0

-attributes #0 = { allockind("alloc,zeroed") allocsize(0) "alloc-family"="runtime.alloc" "target-features"="+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" }
-attributes #1 = { "target-features"="+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" }
-attributes #2 = { nounwind "target-features"="+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" }
-attributes #3 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
-attributes #4 = { nounwind }
+attributes #0 = { "target-features"="+bulk-memory,+bulk-memory-opt,+call-indirect-overlong,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" }
+attributes #1 = { nounwind "target-features"="+bulk-memory,+bulk-memory-opt,+call-indirect-overlong,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" }
+attributes #2 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
+attributes #3 = { nounwind }
@@ -3,32 +3,29 @@ source_filename = "defer.go"
 target datalayout = "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64"
 target triple = "thumbv7m-unknown-unknown-eabi"

-%runtime.deferFrame = type { ptr, ptr, [0 x ptr], ptr, i8, %runtime._interface }
+%runtime.deferFrame = type { ptr, ptr, [0 x ptr], ptr, i8, %runtime._interface, ptr }
 %runtime._interface = type { ptr, ptr }

-; Function Attrs: allockind("alloc,zeroed") allocsize(0)
-declare noalias nonnull ptr @runtime.alloc(i32, ptr, ptr) #0
-
 ; Function Attrs: nounwind
-define hidden void @main.init(ptr %context) unnamed_addr #1 {
+define hidden void @main.init(ptr %context) unnamed_addr #0 {
 entry:
  ret void
 }

-declare void @main.external(ptr) #2
+declare void @main.external(ptr) #1

 ; Function Attrs: nounwind
-define hidden void @main.deferSimple(ptr %context) unnamed_addr #1 {
+define hidden void @main.deferSimple(ptr %context) unnamed_addr #0 {
 entry:
  %defer.alloca = alloca { i32, ptr }, align 4
-  %deferPtr = alloca ptr, align 4
-  store ptr null, ptr %deferPtr, align 4
  %deferframe.buf = alloca %runtime.deferFrame, align 4
+  %deferPtr = getelementptr inbounds nuw i8, ptr %deferframe.buf, i32 24
  %0 = call ptr @llvm.stacksave.p0()
  call void @runtime.setupDeferFrame(ptr nonnull %deferframe.buf, ptr %0, ptr undef) #4
+  %defer.next = load ptr, ptr %deferPtr, align 4
  store i32 0, ptr %defer.alloca, align 4
-  %defer.alloca.repack15 = getelementptr inbounds i8, ptr %defer.alloca, i32 4
-  store ptr null, ptr %defer.alloca.repack15, align 4
+  %defer.alloca.repack15 = getelementptr inbounds nuw i8, ptr %defer.alloca, i32 4
+  store ptr %defer.next, ptr %defer.alloca.repack15, align 4
  store ptr %defer.alloca, ptr %deferPtr, align 4
  %setjmp = call i32 asm "\0Amovs r0, #0\0Amov r2, pc\0Astr r2, [r1, #4]", "={r0},{r1},~{r1},~{r2},~{r3},~{r4},~{r5},~{r6},~{r7},~{r8},~{r9},~{r10},~{r11},~{r12},~{lr},~{q0},~{q1},~{q2},~{q3},~{q4},~{q5},~{q6},~{q7},~{q8},~{q9},~{q10},~{q11},~{q12},~{q13},~{q14},~{q15},~{cpsr},~{memory}"(ptr nonnull %deferframe.buf) #5
  %setjmp.result = icmp eq i32 %setjmp, 0
@@ -51,7 +48,7 @@ rundefers.loophead:                               ; preds = %3, %rundefers.block
  br i1 %stackIsNil, label %rundefers.end, label %rundefers.loop

 rundefers.loop:                                   ; preds = %rundefers.loophead
-  %stack.next.gep = getelementptr inbounds i8, ptr %2, i32 4
+  %stack.next.gep = getelementptr inbounds nuw i8, ptr %2, i32 4
  %stack.next = load ptr, ptr %stack.next.gep, align 4
  store ptr %stack.next, ptr %deferPtr, align 4
  %callback = load i32, ptr %2, align 4
@@ -87,7 +84,7 @@ rundefers.loophead6:                              ; preds = %5, %lpad
  br i1 %stackIsNil7, label %rundefers.end3, label %rundefers.loop5

 rundefers.loop5:                                  ; preds = %rundefers.loophead6
-  %stack.next.gep8 = getelementptr inbounds i8, ptr %4, i32 4
+  %stack.next.gep8 = getelementptr inbounds nuw i8, ptr %4, i32 4
  %stack.next9 = load ptr, ptr %stack.next.gep8, align 4
  store ptr %stack.next9, ptr %deferPtr, align 4
  %callback11 = load i32, ptr %4, align 4
@@ -112,14 +109,14 @@ rundefers.end3:                                   ; preds = %rundefers.loophead6
 }

 ; Function Attrs: nocallback nofree nosync nounwind willreturn
-declare ptr @llvm.stacksave.p0() #3
+declare ptr @llvm.stacksave.p0() #2

-declare void @runtime.setupDeferFrame(ptr dereferenceable_or_null(24), ptr, ptr) #2
+declare void @runtime.setupDeferFrame(ptr dereferenceable_or_null(28), ptr, ptr) #1

-declare void @runtime.destroyDeferFrame(ptr dereferenceable_or_null(24), ptr) #2
+declare void @runtime.destroyDeferFrame(ptr dereferenceable_or_null(28), ptr) #1

 ; Function Attrs: nounwind
-define internal void @"main.deferSimple$1"(ptr %context) unnamed_addr #1 {
+define internal void @"main.deferSimple$1"(ptr %context) unnamed_addr #0 {
 entry:
  call void @runtime.printlock(ptr undef) #4
  call void @runtime.printint32(i32 3, ptr undef) #4
@@ -127,29 +124,29 @@ entry:
  ret void
 }

-declare void @runtime.printlock(ptr) #2
+declare void @runtime.printlock(ptr) #1

-declare void @runtime.printint32(i32, ptr) #2
+declare void @runtime.printint32(i32, ptr) #1

-declare void @runtime.printunlock(ptr) #2
+declare void @runtime.printunlock(ptr) #1

 ; Function Attrs: nounwind
-define hidden void @main.deferMultiple(ptr %context) unnamed_addr #1 {
+define hidden void @main.deferMultiple(ptr %context) unnamed_addr #0 {
 entry:
  %defer.alloca2 = alloca { i32, ptr }, align 4
  %defer.alloca = alloca { i32, ptr }, align 4
-  %deferPtr = alloca ptr, align 4
-  store ptr null, ptr %deferPtr, align 4
  %deferframe.buf = alloca %runtime.deferFrame, align 4
+  %deferPtr = getelementptr inbounds nuw i8, ptr %deferframe.buf, i32 24
  %0 = call ptr @llvm.stacksave.p0()
  call void @runtime.setupDeferFrame(ptr nonnull %deferframe.buf, ptr %0, ptr undef) #4
+  %defer.next = load ptr, ptr %deferPtr, align 4
  store i32 0, ptr %defer.alloca, align 4
-  %defer.alloca.repack22 = getelementptr inbounds i8, ptr %defer.alloca, i32 4
-  store ptr null, ptr %defer.alloca.repack22, align 4
+  %defer.alloca.repack22 = getelementptr inbounds nuw i8, ptr %defer.alloca, i32 4
+  store ptr %defer.next, ptr %defer.alloca.repack22, align 4
  store ptr %defer.alloca, ptr %deferPtr, align 4
  store i32 1, ptr %defer.alloca2, align 4
-  %defer.alloca2.repack23 = getelementptr inbounds i8, ptr %defer.alloca2, i32 4
-  store ptr %defer.alloca, ptr %defer.alloca2.repack23, align 4
+  %defer.alloca2.repack24 = getelementptr inbounds nuw i8, ptr %defer.alloca2, i32 4
+  store ptr %defer.alloca, ptr %defer.alloca2.repack24, align 4
  store ptr %defer.alloca2, ptr %deferPtr, align 4
  %setjmp = call i32 asm "\0Amovs r0, #0\0Amov r2, pc\0Astr r2, [r1, #4]", "={r0},{r1},~{r1},~{r2},~{r3},~{r4},~{r5},~{r6},~{r7},~{r8},~{r9},~{r10},~{r11},~{r12},~{lr},~{q0},~{q1},~{q2},~{q3},~{q4},~{q5},~{q6},~{q7},~{q8},~{q9},~{q10},~{q11},~{q12},~{q13},~{q14},~{q15},~{cpsr},~{memory}"(ptr nonnull %deferframe.buf) #5
  %setjmp.result = icmp eq i32 %setjmp, 0
@@ -172,7 +169,7 @@ rundefers.loophead:                               ; preds = %4, %3, %rundefers.b
  br i1 %stackIsNil, label %rundefers.end, label %rundefers.loop

 rundefers.loop:                                   ; preds = %rundefers.loophead
-  %stack.next.gep = getelementptr inbounds i8, ptr %2, i32 4
+  %stack.next.gep = getelementptr inbounds nuw i8, ptr %2, i32 4
  %stack.next = load ptr, ptr %stack.next.gep, align 4
  store ptr %stack.next, ptr %deferPtr, align 4
  %callback = load i32, ptr %2, align 4
@@ -218,7 +215,7 @@ rundefers.loophead10:                             ; preds = %7, %6, %lpad
  br i1 %stackIsNil11, label %rundefers.end7, label %rundefers.loop9

 rundefers.loop9:                                  ; preds = %rundefers.loophead10
-  %stack.next.gep12 = getelementptr inbounds i8, ptr %5, i32 4
+  %stack.next.gep12 = getelementptr inbounds nuw i8, ptr %5, i32 4
  %stack.next13 = load ptr, ptr %stack.next.gep12, align 4
  store ptr %stack.next13, ptr %deferPtr, align 4
  %callback15 = load i32, ptr %5, align 4
@@ -253,7 +250,7 @@ rundefers.end7:                                   ; preds = %rundefers.loophead1
 }

 ; Function Attrs: nounwind
-define internal void @"main.deferMultiple$1"(ptr %context) unnamed_addr #1 {
+define internal void @"main.deferMultiple$1"(ptr %context) unnamed_addr #0 {
 entry:
  call void @runtime.printlock(ptr undef) #4
  call void @runtime.printint32(i32 3, ptr undef) #4
@@ -262,7 +259,7 @@ entry:
 }

 ; Function Attrs: nounwind
-define internal void @"main.deferMultiple$2"(ptr %context) unnamed_addr #1 {
+define internal void @"main.deferMultiple$2"(ptr %context) unnamed_addr #0 {
 entry:
  call void @runtime.printlock(ptr undef) #4
  call void @runtime.printint32(i32 5, ptr undef) #4
@@ -270,9 +267,244 @@ entry:
  ret void
 }

-attributes #0 = { allockind("alloc,zeroed") allocsize(0) "alloc-family"="runtime.alloc" "target-features"="+armv7-m,+hwdiv,+soft-float,+thumb-mode,-aes,-bf16,-cdecp0,-cdecp1,-cdecp2,-cdecp3,-cdecp4,-cdecp5,-cdecp6,-cdecp7,-crc,-crypto,-d32,-dotprod,-dsp,-fp-armv8,-fp-armv8d16,-fp-armv8d16sp,-fp-armv8sp,-fp16,-fp16fml,-fp64,-fpregs,-fullfp16,-hwdiv-arm,-i8mm,-lob,-mve,-mve.fp,-neon,-pacbti,-ras,-sb,-sha2,-vfp2,-vfp2sp,-vfp3,-vfp3d16,-vfp3d16sp,-vfp3sp,-vfp4,-vfp4d16,-vfp4d16sp,-vfp4sp" }
-attributes #1 = { nounwind "target-features"="+armv7-m,+hwdiv,+soft-float,+thumb-mode,-aes,-bf16,-cdecp0,-cdecp1,-cdecp2,-cdecp3,-cdecp4,-cdecp5,-cdecp6,-cdecp7,-crc,-crypto,-d32,-dotprod,-dsp,-fp-armv8,-fp-armv8d16,-fp-armv8d16sp,-fp-armv8sp,-fp16,-fp16fml,-fp64,-fpregs,-fullfp16,-hwdiv-arm,-i8mm,-lob,-mve,-mve.fp,-neon,-pacbti,-ras,-sb,-sha2,-vfp2,-vfp2sp,-vfp3,-vfp3d16,-vfp3d16sp,-vfp3sp,-vfp4,-vfp4d16,-vfp4d16sp,-vfp4sp" }
-attributes #2 = { "target-features"="+armv7-m,+hwdiv,+soft-float,+thumb-mode,-aes,-bf16,-cdecp0,-cdecp1,-cdecp2,-cdecp3,-cdecp4,-cdecp5,-cdecp6,-cdecp7,-crc,-crypto,-d32,-dotprod,-dsp,-fp-armv8,-fp-armv8d16,-fp-armv8d16sp,-fp-armv8sp,-fp16,-fp16fml,-fp64,-fpregs,-fullfp16,-hwdiv-arm,-i8mm,-lob,-mve,-mve.fp,-neon,-pacbti,-ras,-sb,-sha2,-vfp2,-vfp2sp,-vfp3,-vfp3d16,-vfp3d16sp,-vfp3sp,-vfp4,-vfp4d16,-vfp4d16sp,-vfp4sp" }
-attributes #3 = { nocallback nofree nosync nounwind willreturn }
+; Function Attrs: nounwind
+define hidden void @main.deferInfiniteLoop(ptr %context) unnamed_addr #0 {
+entry:
+  %deferframe.buf = alloca %runtime.deferFrame, align 4
+  %deferPtr = getelementptr inbounds nuw i8, ptr %deferframe.buf, i32 24
+  %0 = call ptr @llvm.stacksave.p0()
+  call void @runtime.setupDeferFrame(ptr nonnull %deferframe.buf, ptr %0, ptr undef) #4
+  br label %for.body
+
+for.body:                                         ; preds = %for.body, %entry
+  %defer.next = load ptr, ptr %deferPtr, align 4
+  %defer.alloc.call = call align 4 dereferenceable(12) ptr @runtime.alloc(i32 12, ptr nonnull inttoptr (i32 135 to ptr), ptr undef) #4
+  store i32 0, ptr %defer.alloc.call, align 4
+  %defer.alloc.call.repack1 = getelementptr inbounds nuw i8, ptr %defer.alloc.call, i32 4
+  store ptr %defer.next, ptr %defer.alloc.call.repack1, align 4
+  %defer.alloc.call.repack3 = getelementptr inbounds nuw i8, ptr %defer.alloc.call, i32 8
+  store i32 8, ptr %defer.alloc.call.repack3, align 4
+  store ptr %defer.alloc.call, ptr %deferPtr, align 4
+  br label %for.body
+
+recover:                                          ; preds = %rundefers.end
+  ret void
+
+lpad:                                             ; No predecessors!
+  br label %rundefers.loophead
+
+rundefers.loophead:                               ; preds = %rundefers.callback0, %lpad
+  br i1 poison, label %rundefers.end, label %rundefers.loop
+
+rundefers.loop:                                   ; preds = %rundefers.loophead
+  switch i32 poison, label %rundefers.default [
+    i32 0, label %rundefers.callback0
+  ]
+
+rundefers.callback0:                              ; preds = %rundefers.loop
+  br label %rundefers.loophead
+
+rundefers.default:                                ; preds = %rundefers.loop
+  unreachable
+
+rundefers.end:                                    ; preds = %rundefers.loophead
+  br label %recover
+}
+
+; Function Attrs: allockind("alloc,zeroed") allocsize(0)
+declare noalias nonnull ptr @runtime.alloc(i32, ptr, ptr) #3
+
+; Function Attrs: nounwind
+define hidden void @main.deferLoop(ptr %context) unnamed_addr #0 {
+entry:
+  %deferframe.buf = alloca %runtime.deferFrame, align 4
+  %deferPtr = getelementptr inbounds nuw i8, ptr %deferframe.buf, i32 24
+  %0 = call ptr @llvm.stacksave.p0()
+  call void @runtime.setupDeferFrame(ptr nonnull %deferframe.buf, ptr %0, ptr undef) #4
+  br label %for.loop
+
+for.loop:                                         ; preds = %for.body, %entry
+  %1 = phi i32 [ 0, %entry ], [ %3, %for.body ]
+  %2 = icmp slt i32 %1, 10
+  br i1 %2, label %for.body, label %for.done
+
+for.body:                                         ; preds = %for.loop
+  %defer.next = load ptr, ptr %deferPtr, align 4
+  %defer.alloc.call = call align 4 dereferenceable(12) ptr @runtime.alloc(i32 12, ptr nonnull inttoptr (i32 135 to ptr), ptr undef) #4
+  store i32 0, ptr %defer.alloc.call, align 4
+  %defer.alloc.call.repack13 = getelementptr inbounds nuw i8, ptr %defer.alloc.call, i32 4
+  store ptr %defer.next, ptr %defer.alloc.call.repack13, align 4
+  %defer.alloc.call.repack15 = getelementptr inbounds nuw i8, ptr %defer.alloc.call, i32 8
+  store i32 %1, ptr %defer.alloc.call.repack15, align 4
+  store ptr %defer.alloc.call, ptr %deferPtr, align 4
+  %3 = add i32 %1, 1
+  br label %for.loop
+
+for.done:                                         ; preds = %for.loop
+  br label %rundefers.block
+
+rundefers.after:                                  ; preds = %rundefers.end
+  call void @runtime.destroyDeferFrame(ptr nonnull %deferframe.buf, ptr undef) #4
+  ret void
+
+rundefers.block:                                  ; preds = %for.done
+  br label %rundefers.loophead
+
+rundefers.loophead:                               ; preds = %rundefers.callback0, %rundefers.block
+  %4 = load ptr, ptr %deferPtr, align 4
+  %stackIsNil = icmp eq ptr %4, null
+  br i1 %stackIsNil, label %rundefers.end, label %rundefers.loop
+
+rundefers.loop:                                   ; preds = %rundefers.loophead
+  %stack.next.gep = getelementptr inbounds nuw i8, ptr %4, i32 4
+  %stack.next = load ptr, ptr %stack.next.gep, align 4
+  store ptr %stack.next, ptr %deferPtr, align 4
+  %callback = load i32, ptr %4, align 4
+  switch i32 %callback, label %rundefers.default [
+    i32 0, label %rundefers.callback0
+  ]
+
+rundefers.callback0:                              ; preds = %rundefers.loop
+  %gep = getelementptr inbounds nuw i8, ptr %4, i32 8
+  %param = load i32, ptr %gep, align 4
+  call void @runtime.printlock(ptr undef) #4
+  call void @runtime.printint32(i32 %param, ptr undef) #4
+  call void @runtime.printunlock(ptr undef) #4
+  br label %rundefers.loophead
+
+rundefers.default:                                ; preds = %rundefers.loop
+  unreachable
+
+rundefers.end:                                    ; preds = %rundefers.loophead
+  br label %rundefers.after
+
+recover:                                          ; preds = %rundefers.end1
+  ret void
+
+lpad:                                             ; No predecessors!
+  br label %rundefers.loophead4
+
+rundefers.loophead4:                              ; preds = %rundefers.callback010, %lpad
+  br i1 poison, label %rundefers.end1, label %rundefers.loop3
+
+rundefers.loop3:                                  ; preds = %rundefers.loophead4
+  switch i32 poison, label %rundefers.default2 [
+    i32 0, label %rundefers.callback010
+  ]
+
+rundefers.callback010:                            ; preds = %rundefers.loop3
+  br label %rundefers.loophead4
+
+rundefers.default2:                               ; preds = %rundefers.loop3
+  unreachable
+
+rundefers.end1:                                   ; preds = %rundefers.loophead4
+  br label %recover
+}
+
+; Function Attrs: nounwind
+define hidden void @main.deferBetweenLoops(ptr %context) unnamed_addr #0 {
+entry:
+  %defer.alloca = alloca { i32, ptr, i32 }, align 4
+  %deferframe.buf = alloca %runtime.deferFrame, align 4
+  %deferPtr = getelementptr inbounds nuw i8, ptr %deferframe.buf, i32 24
+  %0 = call ptr @llvm.stacksave.p0()
+  call void @runtime.setupDeferFrame(ptr nonnull %deferframe.buf, ptr %0, ptr undef) #4
+  br label %for.loop
+
+for.loop:                                         ; preds = %for.body, %entry
+  %1 = phi i32 [ 0, %entry ], [ %3, %for.body ]
+  %2 = icmp slt i32 %1, 10
+  br i1 %2, label %for.body, label %for.done
+
+for.body:                                         ; preds = %for.loop
+  %3 = add i32 %1, 1
+  br label %for.loop
+
+for.done:                                         ; preds = %for.loop
+  %defer.next = load ptr, ptr %deferPtr, align 4
+  store i32 0, ptr %defer.alloca, align 4
+  %defer.alloca.repack16 = getelementptr inbounds nuw i8, ptr %defer.alloca, i32 4
+  store ptr %defer.next, ptr %defer.alloca.repack16, align 4
+  %defer.alloca.repack18 = getelementptr inbounds nuw i8, ptr %defer.alloca, i32 8
+  store i32 1, ptr %defer.alloca.repack18, align 4
+  store ptr %defer.alloca, ptr %deferPtr, align 4
+  br label %for.loop1
+
+for.loop1:                                        ; preds = %for.body2, %for.done
+  %4 = phi i32 [ 0, %for.done ], [ %6, %for.body2 ]
+  %5 = icmp slt i32 %4, 10
+  br i1 %5, label %for.body2, label %for.done3
+
+for.body2:                                        ; preds = %for.loop1
+  %6 = add i32 %4, 1
+  br label %for.loop1
+
+for.done3:                                        ; preds = %for.loop1
+  br label %rundefers.block
+
+rundefers.after:                                  ; preds = %rundefers.end
+  call void @runtime.destroyDeferFrame(ptr nonnull %deferframe.buf, ptr undef) #4
+  ret void
+
+rundefers.block:                                  ; preds = %for.done3
+  br label %rundefers.loophead
+
+rundefers.loophead:                               ; preds = %rundefers.callback0, %rundefers.block
+  %7 = load ptr, ptr %deferPtr, align 4
+  %stackIsNil = icmp eq ptr %7, null
+  br i1 %stackIsNil, label %rundefers.end, label %rundefers.loop
+
+rundefers.loop:                                   ; preds = %rundefers.loophead
+  %stack.next.gep = getelementptr inbounds nuw i8, ptr %7, i32 4
+  %stack.next = load ptr, ptr %stack.next.gep, align 4
+  store ptr %stack.next, ptr %deferPtr, align 4
+  %callback = load i32, ptr %7, align 4
+  switch i32 %callback, label %rundefers.default [
+    i32 0, label %rundefers.callback0
+  ]
+
+rundefers.callback0:                              ; preds = %rundefers.loop
+  %gep = getelementptr inbounds nuw i8, ptr %7, i32 8
+  %param = load i32, ptr %gep, align 4
+  call void @runtime.printlock(ptr undef) #4
+  call void @runtime.printint32(i32 %param, ptr undef) #4
+  call void @runtime.printunlock(ptr undef) #4
+  br label %rundefers.loophead
+
+rundefers.default:                                ; preds = %rundefers.loop
+  unreachable
+
+rundefers.end:                                    ; preds = %rundefers.loophead
+  br label %rundefers.after
+
+recover:                                          ; preds = %rundefers.end4
+  ret void
+
+lpad:                                             ; No predecessors!
+  br label %rundefers.loophead7
+
+rundefers.loophead7:                              ; preds = %rundefers.callback013, %lpad
+  br i1 poison, label %rundefers.end4, label %rundefers.loop6
+
+rundefers.loop6:                                  ; preds = %rundefers.loophead7
+  switch i32 poison, label %rundefers.default5 [
+    i32 0, label %rundefers.callback013
+  ]
+
+rundefers.callback013:                            ; preds = %rundefers.loop6
+  br label %rundefers.loophead7
+
+rundefers.default5:                               ; preds = %rundefers.loop6
+  unreachable
+
+rundefers.end4:                                   ; preds = %rundefers.loophead7
+  br label %recover
+}
+
+attributes #0 = { nounwind "target-features"="+armv7-m,+hwdiv,+soft-float,+thumb-mode,-aes,-bf16,-cdecp0,-cdecp1,-cdecp2,-cdecp3,-cdecp4,-cdecp5,-cdecp6,-cdecp7,-crc,-crypto,-d32,-dotprod,-dsp,-fp-armv8,-fp-armv8d16,-fp-armv8d16sp,-fp-armv8sp,-fp16,-fp16fml,-fp64,-fpregs,-fullfp16,-hwdiv-arm,-i8mm,-lob,-mve,-mve.fp,-neon,-pacbti,-ras,-sb,-sha2,-vfp2,-vfp2sp,-vfp3,-vfp3d16,-vfp3d16sp,-vfp3sp,-vfp4,-vfp4d16,-vfp4d16sp,-vfp4sp" }
+attributes #1 = { "target-features"="+armv7-m,+hwdiv,+soft-float,+thumb-mode,-aes,-bf16,-cdecp0,-cdecp1,-cdecp2,-cdecp3,-cdecp4,-cdecp5,-cdecp6,-cdecp7,-crc,-crypto,-d32,-dotprod,-dsp,-fp-armv8,-fp-armv8d16,-fp-armv8d16sp,-fp-armv8sp,-fp16,-fp16fml,-fp64,-fpregs,-fullfp16,-hwdiv-arm,-i8mm,-lob,-mve,-mve.fp,-neon,-pacbti,-ras,-sb,-sha2,-vfp2,-vfp2sp,-vfp3,-vfp3d16,-vfp3d16sp,-vfp3sp,-vfp4,-vfp4d16,-vfp4d16sp,-vfp4sp" }
+attributes #2 = { nocallback nofree nosync nounwind willreturn }
+attributes #3 = { allockind("alloc,zeroed") allocsize(0) "alloc-family"="runtime.alloc" "target-features"="+armv7-m,+hwdiv,+soft-float,+thumb-mode,-aes,-bf16,-cdecp0,-cdecp1,-cdecp2,-cdecp3,-cdecp4,-cdecp5,-cdecp6,-cdecp7,-crc,-crypto,-d32,-dotprod,-dsp,-fp-armv8,-fp-armv8d16,-fp-armv8d16sp,-fp-armv8sp,-fp16,-fp16fml,-fp64,-fpregs,-fullfp16,-hwdiv-arm,-i8mm,-lob,-mve,-mve.fp,-neon,-pacbti,-ras,-sb,-sha2,-vfp2,-vfp2sp,-vfp3,-vfp3d16,-vfp3d16sp,-vfp3sp,-vfp4,-vfp4d16,-vfp4d16sp,-vfp4sp" }
 attributes #4 = { nounwind }
 attributes #5 = { nounwind returns_twice }
@@ -18,3 +18,23 @@ func deferMultiple() {
 	}()
 	external()
 }
+
+func deferInfiniteLoop() {
+	for {
+		defer print(8)
+	}
+}
+
+func deferLoop() {
+	for i := 0; i < 10; i++ {
+		defer print(i)
+	}
+}
+
+func deferBetweenLoops() {
+	for i := 0; i < 10; i++ {
+	}
+	defer print(1)
+	for i := 0; i < 10; i++ {
+	}
+}
@@ -1,21 +1,18 @@
 ; ModuleID = 'float.go'
 source_filename = "float.go"
-target datalayout = "e-m:e-p:32:32-p10:8:8-p20:8:8-i64:64-n32:64-S128-ni:1:10:20"
+target datalayout = "e-m:e-p:32:32-p10:8:8-p20:8:8-i64:64-i128:128-n32:64-S128-ni:1:10:20"
 target triple = "wasm32-unknown-wasi"

-; Function Attrs: allockind("alloc,zeroed") allocsize(0)
-declare noalias nonnull ptr @runtime.alloc(i32, ptr, ptr) #0
-
-declare void @runtime.trackPointer(ptr nocapture readonly, ptr, ptr) #1
+declare void @runtime.trackPointer(ptr nocapture readonly, ptr, ptr) #0

 ; Function Attrs: nounwind
-define hidden void @main.init(ptr %context) unnamed_addr #2 {
+define hidden void @main.init(ptr %context) unnamed_addr #1 {
 entry:
  ret void
 }

 ; Function Attrs: nounwind
-define hidden i32 @main.f32tou32(float %v, ptr %context) unnamed_addr #2 {
+define hidden i32 @main.f32tou32(float %v, ptr %context) unnamed_addr #1 {
 entry:
  %positive = fcmp oge float %v, 0.000000e+00
  %withinmax = fcmp ole float %v, 0x41EFFFFFC0000000
@@ -27,25 +24,25 @@ entry:
 }

 ; Function Attrs: nounwind
-define hidden float @main.maxu32f(ptr %context) unnamed_addr #2 {
+define hidden float @main.maxu32f(ptr %context) unnamed_addr #1 {
 entry:
  ret float 0x41F0000000000000
 }

 ; Function Attrs: nounwind
-define hidden i32 @main.maxu32tof32(ptr %context) unnamed_addr #2 {
+define hidden i32 @main.maxu32tof32(ptr %context) unnamed_addr #1 {
 entry:
  ret i32 -1
 }

 ; Function Attrs: nounwind
-define hidden { i32, i32, i32, i32 } @main.inftoi32(ptr %context) unnamed_addr #2 {
+define hidden { i32, i32, i32, i32 } @main.inftoi32(ptr %context) unnamed_addr #1 {
 entry:
  ret { i32, i32, i32, i32 } { i32 -1, i32 0, i32 2147483647, i32 -2147483648 }
 }

 ; Function Attrs: nounwind
-define hidden i32 @main.u32tof32tou32(i32 %v, ptr %context) unnamed_addr #2 {
+define hidden i32 @main.u32tof32tou32(i32 %v, ptr %context) unnamed_addr #1 {
 entry:
  %0 = uitofp i32 %v to float
  %withinmax = fcmp ole float %0, 0x41EFFFFFC0000000
@@ -55,7 +52,7 @@ entry:
 }

 ; Function Attrs: nounwind
-define hidden float @main.f32tou32tof32(float %v, ptr %context) unnamed_addr #2 {
+define hidden float @main.f32tou32tof32(float %v, ptr %context) unnamed_addr #1 {
 entry:
  %positive = fcmp oge float %v, 0.000000e+00
  %withinmax = fcmp ole float %v, 0x41EFFFFFC0000000
@@ -68,7 +65,7 @@ entry:
 }

 ; Function Attrs: nounwind
-define hidden i8 @main.f32tou8(float %v, ptr %context) unnamed_addr #2 {
+define hidden i8 @main.f32tou8(float %v, ptr %context) unnamed_addr #1 {
 entry:
  %positive = fcmp oge float %v, 0.000000e+00
  %withinmax = fcmp ole float %v, 2.550000e+02
@@ -80,7 +77,7 @@ entry:
 }

 ; Function Attrs: nounwind
-define hidden i8 @main.f32toi8(float %v, ptr %context) unnamed_addr #2 {
+define hidden i8 @main.f32toi8(float %v, ptr %context) unnamed_addr #1 {
 entry:
  %abovemin = fcmp oge float %v, -1.280000e+02
  %belowmax = fcmp ole float %v, 1.270000e+02
@@ -93,6 +90,5 @@ entry:
  ret i8 %0
 }

-attributes #0 = { allockind("alloc,zeroed") allocsize(0) "alloc-family"="runtime.alloc" "target-features"="+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" }
-attributes #1 = { "target-features"="+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" }
-attributes #2 = { nounwind "target-features"="+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" }
+attributes #0 = { "target-features"="+bulk-memory,+bulk-memory-opt,+call-indirect-overlong,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" }
+attributes #1 = { nounwind "target-features"="+bulk-memory,+bulk-memory-opt,+call-indirect-overlong,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" }
@@ -1,50 +1,46 @@
 ; ModuleID = 'func.go'
 source_filename = "func.go"
-target datalayout = "e-m:e-p:32:32-p10:8:8-p20:8:8-i64:64-n32:64-S128-ni:1:10:20"
+target datalayout = "e-m:e-p:32:32-p10:8:8-p20:8:8-i64:64-i128:128-n32:64-S128-ni:1:10:20"
 target triple = "wasm32-unknown-wasi"

-; Function Attrs: allockind("alloc,zeroed") allocsize(0)
-declare noalias nonnull ptr @runtime.alloc(i32, ptr, ptr) #0
-
-declare void @runtime.trackPointer(ptr nocapture readonly, ptr, ptr) #1
+declare void @runtime.trackPointer(ptr nocapture readonly, ptr, ptr) #0

 ; Function Attrs: nounwind
-define hidden void @main.init(ptr %context) unnamed_addr #2 {
+define hidden void @main.init(ptr %context) unnamed_addr #1 {
 entry:
  ret void
 }

 ; Function Attrs: nounwind
-define hidden void @main.foo(ptr %callback.context, ptr %callback.funcptr, ptr %context) unnamed_addr #2 {
+define hidden void @main.foo(ptr %callback.context, ptr %callback.funcptr, ptr %context) unnamed_addr #1 {
 entry:
  %0 = icmp eq ptr %callback.funcptr, null
  br i1 %0, label %fpcall.throw, label %fpcall.next

 fpcall.next:                                      ; preds = %entry
-  call void %callback.funcptr(i32 3, ptr %callback.context) #3
+  call void %callback.funcptr(i32 3, ptr %callback.context) #2
  ret void

 fpcall.throw:                                     ; preds = %entry
-  call void @runtime.nilPanic(ptr undef) #3
+  call void @runtime.nilPanic(ptr undef) #2
  unreachable
 }

-declare void @runtime.nilPanic(ptr) #1
+declare void @runtime.nilPanic(ptr) #0

 ; Function Attrs: nounwind
-define hidden void @main.bar(ptr %context) unnamed_addr #2 {
+define hidden void @main.bar(ptr %context) unnamed_addr #1 {
 entry:
  call void @main.foo(ptr undef, ptr nonnull @main.someFunc, ptr undef)
  ret void
 }

 ; Function Attrs: nounwind
-define hidden void @main.someFunc(i32 %arg0, ptr %context) unnamed_addr #2 {
+define hidden void @main.someFunc(i32 %arg0, ptr %context) unnamed_addr #1 {
 entry:
  ret void
 }

-attributes #0 = { allockind("alloc,zeroed") allocsize(0) "alloc-family"="runtime.alloc" "target-features"="+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" }
-attributes #1 = { "target-features"="+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" }
-attributes #2 = { nounwind "target-features"="+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" }
-attributes #3 = { nounwind }
+attributes #0 = { "target-features"="+bulk-memory,+bulk-memory-opt,+call-indirect-overlong,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" }
+attributes #1 = { nounwind "target-features"="+bulk-memory,+bulk-memory-opt,+call-indirect-overlong,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" }
+attributes #2 = { nounwind }
@@ -24,6 +24,10 @@ var (
 		x *byte
 		y [61]uintptr
 	}
+	struct5 *struct {
+		x *byte
+		y [30]uintptr
+	}

 	slice1 []byte
 	slice2 []*int
@@ -58,6 +62,10 @@ func newStruct() {
 		x *byte
 		y [61]uintptr
 	})
+	struct5 = new(struct {
+		x *byte
+		y [30]uintptr
+	})
 }

 func newFuncValue() *func() {
@@ -1,6 +1,6 @@
 ; ModuleID = 'gc.go'
 source_filename = "gc.go"
-target datalayout = "e-m:e-p:32:32-p10:8:8-p20:8:8-i64:64-n32:64-S128-ni:1:10:20"
+target datalayout = "e-m:e-p:32:32-p10:8:8-p20:8:8-i64:64-i128:128-n32:64-S128-ni:1:10:20"
 target triple = "wasm32-unknown-wasi"

 %runtime._interface = type { ptr, ptr }
@@ -16,27 +16,25 @@ target triple = "wasm32-unknown-wasi"
@main.struct2 = hidden global ptr null, align 4
@main.struct3 = hidden global ptr null, align 4
@main.struct4 = hidden global ptr null, align 4
+@main.struct5 = hidden global ptr null, align 4
@main.slice1 = hidden global { ptr, i32, i32 } zeroinitializer, align 4
@main.slice2 = hidden global { ptr, i32, i32 } zeroinitializer, align 4
@main.slice3 = hidden global { ptr, i32, i32 } zeroinitializer, align 4
-@"runtime/gc.layout:62-2000000000000001" = linkonce_odr unnamed_addr constant { i32, [8 x i8] } { i32 62, [8 x i8] c"\01\00\00\00\00\00\00 " }
-@"runtime/gc.layout:62-0001" = linkonce_odr unnamed_addr constant { i32, [8 x i8] } { i32 62, [8 x i8] c"\01\00\00\00\00\00\00\00" }
+@"runtime/gc.layout:62-0100000000000020" = linkonce_odr unnamed_addr constant { i32, [8 x i8] } { i32 62, [8 x i8] c"\01\00\00\00\00\00\00 " }
+@"runtime/gc.layout:62-0100000000000000" = linkonce_odr unnamed_addr constant { i32, [8 x i8] } { i32 62, [8 x i8] c"\01\00\00\00\00\00\00\00" }
@"reflect/types.type:basic:complex128" = linkonce_odr constant { i8, ptr } { i8 80, ptr @"reflect/types.type:pointer:basic:complex128" }, align 4
@"reflect/types.type:pointer:basic:complex128" = linkonce_odr constant { i8, i16, ptr } { i8 -43, i16 0, ptr @"reflect/types.type:basic:complex128" }, align 4

-; Function Attrs: allockind("alloc,zeroed") allocsize(0)
-declare noalias nonnull ptr @runtime.alloc(i32, ptr, ptr) #0
-
-declare void @runtime.trackPointer(ptr nocapture readonly, ptr, ptr) #1
+declare void @runtime.trackPointer(ptr nocapture readonly, ptr, ptr) #0

 ; Function Attrs: nounwind
-define hidden void @main.init(ptr %context) unnamed_addr #2 {
+define hidden void @main.init(ptr %context) unnamed_addr #1 {
 entry:
  ret void
 }

 ; Function Attrs: nounwind
-define hidden void @main.newScalar(ptr %context) unnamed_addr #2 {
+define hidden void @main.newScalar(ptr %context) unnamed_addr #1 {
 entry:
  %stackalloc = alloca i8, align 1
  %new = call align 1 dereferenceable(1) ptr @runtime.alloc(i32 1, ptr nonnull inttoptr (i32 3 to ptr), ptr undef) #3
@@ -54,8 +52,11 @@ entry:
  ret void
 }

+; Function Attrs: allockind("alloc,zeroed") allocsize(0)
+declare noalias nonnull ptr @runtime.alloc(i32, ptr, ptr) #2
+
 ; Function Attrs: nounwind
-define hidden void @main.newArray(ptr %context) unnamed_addr #2 {
+define hidden void @main.newArray(ptr %context) unnamed_addr #1 {
 entry:
  %stackalloc = alloca i8, align 1
  %new = call align 1 dereferenceable(3) ptr @runtime.alloc(i32 3, ptr nonnull inttoptr (i32 3 to ptr), ptr undef) #3
@@ -71,26 +72,32 @@ entry:
 }

 ; Function Attrs: nounwind
-define hidden void @main.newStruct(ptr %context) unnamed_addr #2 {
+define hidden void @main.newStruct(ptr %context) unnamed_addr #1 {
 entry:
  %stackalloc = alloca i8, align 1
-  %new = call align 1 ptr @runtime.alloc(i32 0, ptr nonnull inttoptr (i32 3 to ptr), ptr undef) #3
+  %new = call align 1 ptr @runtime.alloc_zero(i32 0, ptr nonnull inttoptr (i32 3 to ptr), ptr undef) #3
  call void @runtime.trackPointer(ptr nonnull %new, ptr nonnull %stackalloc, ptr undef) #3
  store ptr %new, ptr @main.struct1, align 4
  %new1 = call align 4 dereferenceable(8) ptr @runtime.alloc(i32 8, ptr nonnull inttoptr (i32 3 to ptr), ptr undef) #3
  call void @runtime.trackPointer(ptr nonnull %new1, ptr nonnull %stackalloc, ptr undef) #3
  store ptr %new1, ptr @main.struct2, align 4
-  %new2 = call align 4 dereferenceable(248) ptr @runtime.alloc(i32 248, ptr nonnull @"runtime/gc.layout:62-2000000000000001", ptr undef) #3
+  %new2 = call align 4 dereferenceable(248) ptr @runtime.alloc(i32 248, ptr nonnull @"runtime/gc.layout:62-0100000000000020", ptr undef) #3
  call void @runtime.trackPointer(ptr nonnull %new2, ptr nonnull %stackalloc, ptr undef) #3
  store ptr %new2, ptr @main.struct3, align 4
-  %new3 = call align 4 dereferenceable(248) ptr @runtime.alloc(i32 248, ptr nonnull @"runtime/gc.layout:62-0001", ptr undef) #3
+  %new3 = call align 4 dereferenceable(248) ptr @runtime.alloc(i32 248, ptr nonnull @"runtime/gc.layout:62-0100000000000000", ptr undef) #3
  call void @runtime.trackPointer(ptr nonnull %new3, ptr nonnull %stackalloc, ptr undef) #3
  store ptr %new3, ptr @main.struct4, align 4
+  %new4 = call align 4 dereferenceable(124) ptr @runtime.alloc(i32 124, ptr nonnull inttoptr (i32 127 to ptr), ptr undef) #3
+  call void @runtime.trackPointer(ptr nonnull %new4, ptr nonnull %stackalloc, ptr undef) #3
+  store ptr %new4, ptr @main.struct5, align 4
  ret void
 }

+; Function Attrs: allockind("alloc,zeroed") allocsize(0)
+declare noalias nonnull ptr @runtime.alloc_zero(i32, ptr, ptr) #2
+
 ; Function Attrs: nounwind
-define hidden ptr @main.newFuncValue(ptr %context) unnamed_addr #2 {
+define hidden ptr @main.newFuncValue(ptr %context) unnamed_addr #1 {
 entry:
  %stackalloc = alloca i8, align 1
  %new = call align 4 dereferenceable(8) ptr @runtime.alloc(i32 8, ptr nonnull inttoptr (i32 197 to ptr), ptr undef) #3
@@ -99,35 +106,35 @@ entry:
 }

 ; Function Attrs: nounwind
-define hidden void @main.makeSlice(ptr %context) unnamed_addr #2 {
+define hidden void @main.makeSlice(ptr %context) unnamed_addr #1 {
 entry:
  %stackalloc = alloca i8, align 1
  %makeslice = call align 1 dereferenceable(5) ptr @runtime.alloc(i32 5, ptr nonnull inttoptr (i32 3 to ptr), ptr undef) #3
  call void @runtime.trackPointer(ptr nonnull %makeslice, ptr nonnull %stackalloc, ptr undef) #3
  store ptr %makeslice, ptr @main.slice1, align 4
-  store i32 5, ptr getelementptr inbounds (i8, ptr @main.slice1, i32 4), align 4
-  store i32 5, ptr getelementptr inbounds (i8, ptr @main.slice1, i32 8), align 4
+  store i32 5, ptr getelementptr inbounds nuw (i8, ptr @main.slice1, i32 4), align 4
+  store i32 5, ptr getelementptr inbounds nuw (i8, ptr @main.slice1, i32 8), align 4
  %makeslice1 = call align 4 dereferenceable(20) ptr @runtime.alloc(i32 20, ptr nonnull inttoptr (i32 67 to ptr), ptr undef) #3
  call void @runtime.trackPointer(ptr nonnull %makeslice1, ptr nonnull %stackalloc, ptr undef) #3
  store ptr %makeslice1, ptr @main.slice2, align 4
-  store i32 5, ptr getelementptr inbounds (i8, ptr @main.slice2, i32 4), align 4
-  store i32 5, ptr getelementptr inbounds (i8, ptr @main.slice2, i32 8), align 4
+  store i32 5, ptr getelementptr inbounds nuw (i8, ptr @main.slice2, i32 4), align 4
+  store i32 5, ptr getelementptr inbounds nuw (i8, ptr @main.slice2, i32 8), align 4
  %makeslice3 = call align 4 dereferenceable(60) ptr @runtime.alloc(i32 60, ptr nonnull inttoptr (i32 71 to ptr), ptr undef) #3
  call void @runtime.trackPointer(ptr nonnull %makeslice3, ptr nonnull %stackalloc, ptr undef) #3
  store ptr %makeslice3, ptr @main.slice3, align 4
-  store i32 5, ptr getelementptr inbounds (i8, ptr @main.slice3, i32 4), align 4
-  store i32 5, ptr getelementptr inbounds (i8, ptr @main.slice3, i32 8), align 4
+  store i32 5, ptr getelementptr inbounds nuw (i8, ptr @main.slice3, i32 4), align 4
+  store i32 5, ptr getelementptr inbounds nuw (i8, ptr @main.slice3, i32 8), align 4
  ret void
 }

 ; Function Attrs: nounwind
-define hidden %runtime._interface @main.makeInterface(double %v.r, double %v.i, ptr %context) unnamed_addr #2 {
+define hidden %runtime._interface @main.makeInterface(double %v.r, double %v.i, ptr %context) unnamed_addr #1 {
 entry:
  %stackalloc = alloca i8, align 1
-  %0 = call align 8 dereferenceable(16) ptr @runtime.alloc(i32 16, ptr null, ptr undef) #3
+  %0 = call align 8 dereferenceable(16) ptr @runtime.alloc(i32 16, ptr nonnull inttoptr (i32 3 to ptr), ptr undef) #3
  call void @runtime.trackPointer(ptr nonnull %0, ptr nonnull %stackalloc, ptr undef) #3
  store double %v.r, ptr %0, align 8
-  %.repack1 = getelementptr inbounds i8, ptr %0, i32 8
+  %.repack1 = getelementptr inbounds nuw i8, ptr %0, i32 8
  store double %v.i, ptr %.repack1, align 8
  %1 = insertvalue %runtime._interface { ptr @"reflect/types.type:basic:complex128", ptr undef }, ptr %0, 1
  call void @runtime.trackPointer(ptr nonnull @"reflect/types.type:basic:complex128", ptr nonnull %stackalloc, ptr undef) #3
@@ -135,7 +142,7 @@ entry:
  ret %runtime._interface %1
 }

-attributes #0 = { allockind("alloc,zeroed") allocsize(0) "alloc-family"="runtime.alloc" "target-features"="+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" }
-attributes #1 = { "target-features"="+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" }
-attributes #2 = { nounwind "target-features"="+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" }
+attributes #0 = { "target-features"="+bulk-memory,+bulk-memory-opt,+call-indirect-overlong,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" }
+attributes #1 = { nounwind "target-features"="+bulk-memory,+bulk-memory-opt,+call-indirect-overlong,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" }
+attributes #2 = { allockind("alloc,zeroed") allocsize(0) "alloc-family"="runtime.alloc" "target-features"="+bulk-memory,+bulk-memory-opt,+call-indirect-overlong,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" }
 attributes #3 = { nounwind }
@@ -19,12 +19,49 @@ func Add[T Coord](a, b Point[T]) Point[T] {
 	}
 }

+func aliasSize[F float32 | float64]() uintptr {
+	return unsafe.Sizeof(F(0))
+}
+
+func aliasSize32() uintptr {
+	type F = float32
+	return aliasSize[F]()
+}
+
+func aliasSize64() uintptr {
+	type F = float64
+	return aliasSize[F]()
+}
+
+type aliasMethodResult[F float32 | float64] struct {
+	Value F
+}
+
+type aliasMethodValue[F float32 | float64] struct{}
+
+func (aliasMethodValue[F]) Get() aliasMethodResult[F] {
+	return aliasMethodResult[F]{}
+}
+
 func main() {
 	var af, bf Point[float32]
 	Add(af, bf)

 	var ai, bi Point[int]
 	Add(ai, bi)
+
+	checkSize(aliasSize32())
+	checkSize(aliasSize64())
 }

 func checkSize(uintptr)
+
+func checkBool(bool)
+
+func aliasMethod32(x any) {
+	type F = float32
+	_, ok := x.(interface {
+		Get() aliasMethodResult[F]
+	})
+	checkBool(ok)
+}
--- a/Show More
+++ b/Show More