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compiler: implement copy directly

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The compiler now implements the copy builtin directly instead of calling sliceCopy.
The length is calculated with the llvm.umax.* intrinsics, and the move is performed by llvm.memmove.*.
Both of these operations are easily understood by LLVM's optimization passes.
The type's alignment is also provided to llvm.memmove.*, which is useful when rewriting the move.

Interp no longer needs to reimplement sliceCopy.
Some edge case handling was implemented by sliceCopy but not llvm.memmove.*/llvm.memcpy.*.
I copied this over, so copies of external slices should work now.
Volatile moves/copies are now run at runtime by interp.

There is a 4-byte size increase due to some confusing length logic in sendUSBPacket.
I will look at sendUSBPacket in a future PR.
This commit is contained in:
Nia Waldvogel
2025-12-26 19:19:21 -05:00
committed by Nia
parent bc9708f51a
commit a40586d092
17 changed files with 353 additions and 358 deletions
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builder/sizes_test.go
+1 -1
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@@ -44,7 +44,7 @@ func TestBinarySize(t *testing.T) {
// microcontrollers
{"hifive1b", "examples/echo", 3668, 280, 0, 2244},
{"microbit", "examples/serial", 2694, 342, 8, 2248},
{"wioterminal", "examples/pininterrupt", 6833, 1491, 120, 6888},
{"wioterminal", "examples/pininterrupt", 6837, 1491, 120, 6888},
// TODO: also check wasm. Right now this is difficult, because
// wasm binaries are run through wasm-opt and therefore the