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compiler: add 'align' attribute to runtime.alloc calls

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This adds something like 'align 4' to the runtime.alloc calls, so that
the compiler knows the alignment of the allocation and can optimize
accordingly.

The optimization is very small, only 0.01% in my small test. However, my
plan is to read the value in the heap-to-stack transform pass to make it
more correct and let it produce slightly more optimal code.
This commit is contained in:
Ayke van Laethem
2024-06-27 20:25:33 +02:00
committed by Ron Evans
parent 9cb263479c
commit 571447c7c1
6 changed files with 36 additions and 30 deletions
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compiler/testdata/goroutine-cortex-m-qemu-tasks.ll
Vendored
+4 -4
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@@ -63,9 +63,9 @@ entry:
; Function Attrs: nounwind
define hidden void @main.closureFunctionGoroutine(ptr %context) unnamed_addr #1 {
entry:
%n = call dereferenceable(4) ptr @runtime.alloc(i32 4, ptr nonnull inttoptr (i32 3 to ptr), ptr undef) #9
%n = call align 4 dereferenceable(4) ptr @runtime.alloc(i32 4, ptr nonnull inttoptr (i32 3 to ptr), ptr undef) #9
store i32 3, ptr %n, align 4
%0 = call dereferenceable(8) ptr @runtime.alloc(i32 8, ptr null, ptr undef) #9
%0 = call align 4 dereferenceable(8) ptr @runtime.alloc(i32 8, ptr null, ptr undef) #9
store i32 5, ptr %0, align 4
%1 = getelementptr inbounds { i32, ptr }, ptr %0, i32 0, i32 1
store ptr %n, ptr %1, align 4
@@ -98,7 +98,7 @@ declare void @runtime.printint32(i32, ptr) #2
; Function Attrs: nounwind
define hidden void @main.funcGoroutine(ptr %fn.context, ptr %fn.funcptr, ptr %context) unnamed_addr #1 {
entry:
%0 = call dereferenceable(12) ptr @runtime.alloc(i32 12, ptr null, ptr undef) #9
%0 = call align 4 dereferenceable(12) ptr @runtime.alloc(i32 12, ptr null, ptr undef) #9
store i32 5, ptr %0, align 4
%1 = getelementptr inbounds { i32, ptr, ptr }, ptr %0, i32 0, i32 1
store ptr %fn.context, ptr %1, align 4
@@ -148,7 +148,7 @@ declare void @runtime.chanClose(ptr dereferenceable_or_null(32), ptr) #2
; Function Attrs: nounwind
define hidden void @main.startInterfaceMethod(ptr %itf.typecode, ptr %itf.value, ptr %context) unnamed_addr #1 {
entry:
%0 = call dereferenceable(16) ptr @runtime.alloc(i32 16, ptr null, ptr undef) #9
%0 = call align 4 dereferenceable(16) ptr @runtime.alloc(i32 16, ptr null, ptr undef) #9
store ptr %itf.value, ptr %0, align 4
%1 = getelementptr inbounds { ptr, %runtime._string, ptr }, ptr %0, i32 0, i32 1
store ptr @"main$string", ptr %1, align 4