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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/symbol.go
+1 -1
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@@ -162,7 +162,7 @@ func (c *compilerContext) getFunction(fn *ssa.Function) (llvm.Type, llvm.Value)
llvmFn.AddAttributeAtIndex(1, c.ctx.CreateEnumAttribute(llvm.AttributeKindID("nocapture"), 0))
case "machine.keepAliveNoEscape", "machine.unsafeNoEscape":
llvmFn.AddAttributeAtIndex(1, c.ctx.CreateEnumAttribute(llvm.AttributeKindID("nocapture"), 0))
case "runtime.alloc", "runtime.alloc_noheap":
case "runtime.alloc", "runtime.alloc_noheap", "runtime.alloc_zero":
// Tell the optimizer that runtime.alloc is an allocator, meaning that it
// returns values that are never null and never alias to an existing value.
for _, attrName := range []string{"noalias", "nonnull"} {