f180339d6b
This gives a small improvement now, and is needed to be able to use the
Heap2Stack transform that's available in the Attributor pass. This
Heap2Stack transform could replace our custom OptimizeAllocs pass.
Most of the changes are just IR that changed, the actual change is
relatively small.
To give an example of why this is useful, here is the code size before
this change:
$ tinygo build -o test -size=short ./testdata/stdlib.go
code data bss | flash ram
95620 1812 968 | 97432 2780
$ tinygo build -o test -size=short ./testdata/stdlib.go
code data bss | flash ram
95380 1812 968 | 97192 2780
That's a 0.25% reduction. Not a whole lot, but nice for such a small
patch.
63 строки
2,3 КиБ
LLVM
63 строки
2,3 КиБ
LLVM
; ModuleID = 'go1.20.go'
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source_filename = "go1.20.go"
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target datalayout = "e-m:e-p:32:32-p10:8:8-p20:8:8-i64:64-n32:64-S128-ni:1:10:20"
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target triple = "wasm32-unknown-wasi"
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%runtime._string = type { ptr, i32 }
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; Function Attrs: allockind("alloc,zeroed") allocsize(0)
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declare noalias nonnull ptr @runtime.alloc(i32, ptr, ptr) #0
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declare void @runtime.trackPointer(ptr nocapture readonly, ptr, ptr) #1
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; Function Attrs: nounwind
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define hidden void @main.init(ptr %context) unnamed_addr #2 {
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entry:
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ret void
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}
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; Function Attrs: nounwind
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define hidden ptr @main.unsafeSliceData(ptr %s.data, i32 %s.len, i32 %s.cap, ptr %context) unnamed_addr #2 {
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entry:
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%stackalloc = alloca i8, align 1
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call void @runtime.trackPointer(ptr %s.data, ptr nonnull %stackalloc, ptr undef) #3
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ret ptr %s.data
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}
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; Function Attrs: nounwind
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define hidden %runtime._string @main.unsafeString(ptr dereferenceable_or_null(1) %ptr, i16 %len, ptr %context) unnamed_addr #2 {
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entry:
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%stackalloc = alloca i8, align 1
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%0 = icmp slt i16 %len, 0
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%1 = icmp eq ptr %ptr, null
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%2 = icmp ne i16 %len, 0
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%3 = and i1 %1, %2
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%4 = or i1 %3, %0
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br i1 %4, label %unsafe.String.throw, label %unsafe.String.next
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unsafe.String.next: ; preds = %entry
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%5 = zext i16 %len to i32
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%6 = insertvalue %runtime._string undef, ptr %ptr, 0
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%7 = insertvalue %runtime._string %6, i32 %5, 1
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call void @runtime.trackPointer(ptr %ptr, ptr nonnull %stackalloc, ptr undef) #3
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ret %runtime._string %7
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unsafe.String.throw: ; preds = %entry
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call void @runtime.unsafeSlicePanic(ptr undef) #3
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unreachable
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}
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declare void @runtime.unsafeSlicePanic(ptr) #1
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; Function Attrs: nounwind
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define hidden ptr @main.unsafeStringData(ptr %s.data, i32 %s.len, ptr %context) unnamed_addr #2 {
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entry:
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%stackalloc = alloca i8, align 1
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call void @runtime.trackPointer(ptr %s.data, ptr nonnull %stackalloc, ptr undef) #3
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ret ptr %s.data
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}
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attributes #0 = { allockind("alloc,zeroed") allocsize(0) "alloc-family"="runtime.alloc" "target-features"="+bulk-memory,+nontrapping-fptoint,+sign-ext" }
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attributes #1 = { "target-features"="+bulk-memory,+nontrapping-fptoint,+sign-ext" }
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attributes #2 = { nounwind "target-features"="+bulk-memory,+nontrapping-fptoint,+sign-ext" }
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attributes #3 = { nounwind }
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