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compiler: mark stringFromBytes as nocapture/readonly to help escape analysis

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Fixes #4525
This commit is contained in:
Damian Gryski
2024-10-18 08:00:42 -07:00
committed by Ron Evans
parent 01dac8ba8e
commit 40c9c66c1d
2 changed files with 8 additions and 0 deletions
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compiler/symbol.go
+3
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@@ -172,6 +172,9 @@ func (c *compilerContext) getFunction(fn *ssa.Function) (llvm.Type, llvm.Value)
llvmFn.AddAttributeAtIndex(1, c.ctx.CreateEnumAttribute(llvm.AttributeKindID("nocapture"), 0))
llvmFn.AddAttributeAtIndex(2, c.ctx.CreateEnumAttribute(llvm.AttributeKindID("readonly"), 0))
llvmFn.AddAttributeAtIndex(2, c.ctx.CreateEnumAttribute(llvm.AttributeKindID("nocapture"), 0))
case "runtime.stringFromBytes":
llvmFn.AddAttributeAtIndex(1, c.ctx.CreateEnumAttribute(llvm.AttributeKindID("nocapture"), 0))
llvmFn.AddAttributeAtIndex(1, c.ctx.CreateEnumAttribute(llvm.AttributeKindID("readonly"), 0))
case "runtime.trackPointer":
// This function is necessary for tracking pointers on the stack in a
// portable way (see gc_stack_portable.go). Indicate to the optimizer
transform/testdata/allocs2.go
Vendored
+5
View File
@@ -49,6 +49,11 @@ func main() {
n4 = n5
}()
println(n4, n5)
// This shouldn't escape.
var buf [32]byte
s := string(buf[:])
println(len(s))
}
func derefInt(x *int) int {