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compiler: add alloc attributes to runtime.alloc

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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.
This commit is contained in:
Ayke van Laethem
2023-03-11 20:57:40 +01:00
committed by Ron Evans
parent 5ed0cecf0d
commit f180339d6b
17 changed files with 504 additions and 447 deletions
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compiler/testdata/pointer.ll
Vendored
+14 -12
View File
@@ -3,46 +3,48 @@ source_filename = "pointer.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 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) #0
declare void @runtime.trackPointer(ptr nocapture readonly, ptr, ptr) #1
; Function Attrs: nounwind
define hidden void @main.init(ptr %context) unnamed_addr #1 {
define hidden void @main.init(ptr %context) unnamed_addr #2 {
entry:
ret void
}
; Function Attrs: nounwind
define hidden [0 x i32] @main.pointerDerefZero(ptr %x, ptr %context) unnamed_addr #1 {
define hidden [0 x i32] @main.pointerDerefZero(ptr %x, ptr %context) unnamed_addr #2 {
entry:
ret [0 x i32] zeroinitializer
}
; Function Attrs: nounwind
define hidden ptr @main.pointerCastFromUnsafe(ptr %x, ptr %context) unnamed_addr #1 {
define hidden ptr @main.pointerCastFromUnsafe(ptr %x, ptr %context) unnamed_addr #2 {
entry:
%stackalloc = alloca i8, align 1
call void @runtime.trackPointer(ptr %x, ptr nonnull %stackalloc, ptr undef) #2
call void @runtime.trackPointer(ptr %x, ptr nonnull %stackalloc, ptr undef) #3
ret ptr %x
}
; Function Attrs: nounwind
define hidden ptr @main.pointerCastToUnsafe(ptr dereferenceable_or_null(4) %x, ptr %context) unnamed_addr #1 {
define hidden ptr @main.pointerCastToUnsafe(ptr dereferenceable_or_null(4) %x, ptr %context) unnamed_addr #2 {
entry:
%stackalloc = alloca i8, align 1
call void @runtime.trackPointer(ptr %x, ptr nonnull %stackalloc, ptr undef) #2
call void @runtime.trackPointer(ptr %x, ptr nonnull %stackalloc, ptr undef) #3
ret ptr %x
}
; Function Attrs: nounwind
define hidden ptr @main.pointerCastToUnsafeNoop(ptr dereferenceable_or_null(1) %x, ptr %context) unnamed_addr #1 {
define hidden ptr @main.pointerCastToUnsafeNoop(ptr dereferenceable_or_null(1) %x, ptr %context) unnamed_addr #2 {
entry:
%stackalloc = alloca i8, align 1
call void @runtime.trackPointer(ptr %x, ptr nonnull %stackalloc, ptr undef) #2
call void @runtime.trackPointer(ptr %x, ptr nonnull %stackalloc, ptr undef) #3
ret ptr %x
}
attributes #0 = { "target-features"="+bulk-memory,+nontrapping-fptoint,+sign-ext" }
attributes #1 = { nounwind "target-features"="+bulk-memory,+nontrapping-fptoint,+sign-ext" }
attributes #2 = { nounwind }
attributes #0 = { allockind("alloc,zeroed") allocsize(0) "alloc-family"="runtime.alloc" "target-features"="+bulk-memory,+nontrapping-fptoint,+sign-ext" }
attributes #1 = { "target-features"="+bulk-memory,+nontrapping-fptoint,+sign-ext" }
attributes #2 = { nounwind "target-features"="+bulk-memory,+nontrapping-fptoint,+sign-ext" }
attributes #3 = { nounwind }