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02db7c55a3
ObjC ARC Optimizer. The main implication of this is: 1. Ensuring that we treat it conservatively in terms of optimization. 2. We put the ASM marker on it so that the runtime can recognize objc_unsafeClaimAutoreleasedReturnValue from releaseRV. <rdar://problem/21567064> Patch by Michael Gottesman! llvm-svn: 258970
46 lines
1.5 KiB
LLVM
46 lines
1.5 KiB
LLVM
; RUN: opt -S -objc-arc-contract < %s | FileCheck %s
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; CHECK-LABEL: define void @foo() {
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; CHECK: %call = tail call i32* @qux()
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; CHECK-NEXT: %tcall = bitcast i32* %call to i8*
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; CHECK-NEXT: call void asm sideeffect "mov\09r7, r7\09\09@ marker for return value optimization", ""()
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; CHECK-NEXT: %0 = tail call i8* @objc_retainAutoreleasedReturnValue(i8* %tcall) [[NUW:#[0-9]+]]
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; CHECK: }
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define void @foo() {
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entry:
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%call = tail call i32* @qux()
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%tcall = bitcast i32* %call to i8*
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%0 = tail call i8* @objc_retainAutoreleasedReturnValue(i8* %tcall) nounwind
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tail call void @bar(i8* %0)
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ret void
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}
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; CHECK-LABEL: define void @foo2() {
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; CHECK: %call = tail call i32* @qux()
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; CHECK-NEXT: %tcall = bitcast i32* %call to i8*
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; CHECK-NEXT: call void asm sideeffect "mov\09r7, r7\09\09@ marker for return value optimization", ""()
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; CHECK-NEXT: %0 = tail call i8* @objc_unsafeClaimAutoreleasedReturnValue(i8* %tcall) [[NUW:#[0-9]+]]
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; CHECK: }
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define void @foo2() {
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entry:
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%call = tail call i32* @qux()
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%tcall = bitcast i32* %call to i8*
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%0 = tail call i8* @objc_unsafeClaimAutoreleasedReturnValue(i8* %tcall) nounwind
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tail call void @bar(i8* %0)
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ret void
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}
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declare i32* @qux()
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declare i8* @objc_retainAutoreleasedReturnValue(i8*)
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declare i8* @objc_unsafeClaimAutoreleasedReturnValue(i8*)
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declare void @bar(i8*)
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!clang.arc.retainAutoreleasedReturnValueMarker = !{!0}
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!0 = !{!"mov\09r7, r7\09\09@ marker for return value optimization"}
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; CHECK: attributes [[NUW]] = { nounwind }
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