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compiler: insert basic blocks at an appropriate location
For example, this commit moves the 'throw' branch of an assertion (nil check, slice index check, etc) to the end of the function while inserting the "continue" branch right after the insert location. This makes the resulting IR easier to follow. For some reason, this also reduces code size a bit on average. The TinyGo smoke tests saw a reduction of 0.22%, mainly from WebAssembly. The drivers repo saw little average change in code size (-0.01%). This commit also adds a few compiler tests for the defer keyword.
This commit is contained in:
Ayke van Laethem
committed by
Ron Evans
Ron Evans
parent
2fb5174910
commit
79ba6a50c3
+142
@@ -0,0 +1,142 @@
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; ModuleID = 'defer.go'
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source_filename = "defer.go"
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target datalayout = "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64"
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target triple = "thumbv7m-unknown-unknown-eabi"
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%runtime._defer = type { i32, %runtime._defer* }
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declare noalias nonnull i8* @runtime.alloc(i32, i8*, i8*)
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; Function Attrs: nounwind
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define hidden void @main.init(i8* %context) unnamed_addr #0 {
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entry:
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ret void
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}
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declare void @main.external(i8*)
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; Function Attrs: nounwind
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define hidden void @main.deferSimple(i8* %context) unnamed_addr #0 {
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entry:
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%defer.alloca = alloca { i32, %runtime._defer* }, align 4
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%deferPtr = alloca %runtime._defer*, align 4
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store %runtime._defer* null, %runtime._defer** %deferPtr, align 4
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%defer.alloca.repack = getelementptr inbounds { i32, %runtime._defer* }, { i32, %runtime._defer* }* %defer.alloca, i32 0, i32 0
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store i32 0, i32* %defer.alloca.repack, align 4
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%defer.alloca.repack1 = getelementptr inbounds { i32, %runtime._defer* }, { i32, %runtime._defer* }* %defer.alloca, i32 0, i32 1
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store %runtime._defer* null, %runtime._defer** %defer.alloca.repack1, align 4
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%0 = bitcast %runtime._defer** %deferPtr to { i32, %runtime._defer* }**
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store { i32, %runtime._defer* }* %defer.alloca, { i32, %runtime._defer* }** %0, align 4
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call void @main.external(i8* undef) #0
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br label %rundefers.loophead
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rundefers.loophead: ; preds = %rundefers.callback0, %entry
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%1 = load %runtime._defer*, %runtime._defer** %deferPtr, align 4
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%stackIsNil = icmp eq %runtime._defer* %1, null
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br i1 %stackIsNil, label %rundefers.end, label %rundefers.loop
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rundefers.loop: ; preds = %rundefers.loophead
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%stack.next.gep = getelementptr inbounds %runtime._defer, %runtime._defer* %1, i32 0, i32 1
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%stack.next = load %runtime._defer*, %runtime._defer** %stack.next.gep, align 4
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store %runtime._defer* %stack.next, %runtime._defer** %deferPtr, align 4
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%callback.gep = getelementptr inbounds %runtime._defer, %runtime._defer* %1, i32 0, i32 0
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%callback = load i32, i32* %callback.gep, align 4
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switch i32 %callback, label %rundefers.default [
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i32 0, label %rundefers.callback0
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]
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rundefers.callback0: ; preds = %rundefers.loop
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call void @"main.deferSimple$1"(i8* undef)
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br label %rundefers.loophead
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rundefers.default: ; preds = %rundefers.loop
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unreachable
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rundefers.end: ; preds = %rundefers.loophead
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ret void
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recover: ; No predecessors!
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ret void
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}
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; Function Attrs: nounwind
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define hidden void @"main.deferSimple$1"(i8* %context) unnamed_addr #0 {
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entry:
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call void @runtime.printint32(i32 3, i8* undef) #0
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ret void
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}
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declare void @runtime.printint32(i32, i8*)
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; Function Attrs: nounwind
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define hidden void @main.deferMultiple(i8* %context) unnamed_addr #0 {
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entry:
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%defer.alloca2 = alloca { i32, %runtime._defer* }, align 4
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%defer.alloca = alloca { i32, %runtime._defer* }, align 4
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%deferPtr = alloca %runtime._defer*, align 4
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store %runtime._defer* null, %runtime._defer** %deferPtr, align 4
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%defer.alloca.repack = getelementptr inbounds { i32, %runtime._defer* }, { i32, %runtime._defer* }* %defer.alloca, i32 0, i32 0
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store i32 0, i32* %defer.alloca.repack, align 4
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%defer.alloca.repack5 = getelementptr inbounds { i32, %runtime._defer* }, { i32, %runtime._defer* }* %defer.alloca, i32 0, i32 1
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store %runtime._defer* null, %runtime._defer** %defer.alloca.repack5, align 4
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%0 = bitcast %runtime._defer** %deferPtr to { i32, %runtime._defer* }**
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store { i32, %runtime._defer* }* %defer.alloca, { i32, %runtime._defer* }** %0, align 4
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%defer.alloca2.repack = getelementptr inbounds { i32, %runtime._defer* }, { i32, %runtime._defer* }* %defer.alloca2, i32 0, i32 0
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store i32 1, i32* %defer.alloca2.repack, align 4
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%defer.alloca2.repack6 = getelementptr inbounds { i32, %runtime._defer* }, { i32, %runtime._defer* }* %defer.alloca2, i32 0, i32 1
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%1 = bitcast %runtime._defer** %defer.alloca2.repack6 to { i32, %runtime._defer* }**
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store { i32, %runtime._defer* }* %defer.alloca, { i32, %runtime._defer* }** %1, align 4
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%2 = bitcast %runtime._defer** %deferPtr to { i32, %runtime._defer* }**
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store { i32, %runtime._defer* }* %defer.alloca2, { i32, %runtime._defer* }** %2, align 4
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call void @main.external(i8* undef) #0
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br label %rundefers.loophead
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rundefers.loophead: ; preds = %rundefers.callback1, %rundefers.callback0, %entry
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%3 = load %runtime._defer*, %runtime._defer** %deferPtr, align 4
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%stackIsNil = icmp eq %runtime._defer* %3, null
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br i1 %stackIsNil, label %rundefers.end, label %rundefers.loop
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rundefers.loop: ; preds = %rundefers.loophead
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%stack.next.gep = getelementptr inbounds %runtime._defer, %runtime._defer* %3, i32 0, i32 1
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%stack.next = load %runtime._defer*, %runtime._defer** %stack.next.gep, align 4
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store %runtime._defer* %stack.next, %runtime._defer** %deferPtr, align 4
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%callback.gep = getelementptr inbounds %runtime._defer, %runtime._defer* %3, i32 0, i32 0
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%callback = load i32, i32* %callback.gep, align 4
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switch i32 %callback, label %rundefers.default [
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i32 0, label %rundefers.callback0
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i32 1, label %rundefers.callback1
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]
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rundefers.callback0: ; preds = %rundefers.loop
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call void @"main.deferMultiple$1"(i8* undef)
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br label %rundefers.loophead
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rundefers.callback1: ; preds = %rundefers.loop
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call void @"main.deferMultiple$2"(i8* undef)
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br label %rundefers.loophead
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rundefers.default: ; preds = %rundefers.loop
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unreachable
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rundefers.end: ; preds = %rundefers.loophead
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ret void
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recover: ; No predecessors!
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ret void
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}
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; Function Attrs: nounwind
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define hidden void @"main.deferMultiple$1"(i8* %context) unnamed_addr #0 {
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entry:
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call void @runtime.printint32(i32 3, i8* undef) #0
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ret void
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}
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; Function Attrs: nounwind
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define hidden void @"main.deferMultiple$2"(i8* %context) unnamed_addr #0 {
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entry:
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call void @runtime.printint32(i32 5, i8* undef) #0
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ret void
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}
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attributes #0 = { nounwind }
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