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compiler, runtime: optimize zero-sized allocations

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Instead of referring to an unused global, use a constant value. This is
safe even when using `-gc=none` (since no actual memory gets allocated)
which wasn't the case before. It should also reduce binary size by a few
bytes for most programs.
This commit is contained in:
Ayke van Laethem
2026-05-25 18:55:36 +02:00
committed by Ron Evans
parent 221ea6a54c
commit 134de98ba5
18 changed files with 63 additions and 12 deletions
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compiler/testdata/gc.ll
Vendored
+4 -1
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@@ -75,7 +75,7 @@ entry:
define hidden void @main.newStruct(ptr %context) unnamed_addr #1 {
entry:
%stackalloc = alloca i8, align 1
%new = call align 1 ptr @runtime.alloc(i32 0, ptr nonnull inttoptr (i32 3 to ptr), ptr undef) #3
%new = call align 1 ptr @runtime.alloc_zero(i32 0, ptr nonnull inttoptr (i32 3 to ptr), ptr undef) #3
call void @runtime.trackPointer(ptr nonnull %new, ptr nonnull %stackalloc, ptr undef) #3
store ptr %new, ptr @main.struct1, align 4
%new1 = call align 4 dereferenceable(8) ptr @runtime.alloc(i32 8, ptr nonnull inttoptr (i32 3 to ptr), ptr undef) #3
@@ -93,6 +93,9 @@ entry:
ret void
}
; Function Attrs: allockind("alloc,zeroed") allocsize(0)
declare noalias nonnull ptr @runtime.alloc_zero(i32, ptr, ptr) #2
; Function Attrs: nounwind
define hidden ptr @main.newFuncValue(ptr %context) unnamed_addr #1 {
entry: