1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
|
; RUN: opt -S -objc-arc-contract < %s | FileCheck %s
; CHECK-LABEL: define void @foo() {
; CHECK: %call = tail call i32* @qux()
; CHECK-NEXT: %tcall = bitcast i32* %call to i8*
; CHECK-NEXT: call void asm sideeffect "mov\09r7, r7\09\09@ marker for return value optimization", ""()
; CHECK-NEXT: %0 = tail call i8* @llvm.objc.retainAutoreleasedReturnValue(i8* %tcall) [[NUW:#[0-9]+]]
; CHECK: }
define void @foo() {
entry:
%call = tail call i32* @qux()
%tcall = bitcast i32* %call to i8*
%0 = tail call i8* @llvm.objc.retainAutoreleasedReturnValue(i8* %tcall) nounwind
tail call void @bar(i8* %0)
ret void
}
; CHECK-LABEL: define void @foo2() {
; CHECK: %call = tail call i32* @qux()
; CHECK-NEXT: %tcall = bitcast i32* %call to i8*
; CHECK-NEXT: call void asm sideeffect "mov\09r7, r7\09\09@ marker for return value optimization", ""()
; CHECK-NEXT: %0 = tail call i8* @llvm.objc.unsafeClaimAutoreleasedReturnValue(i8* %tcall) [[NUW:#[0-9]+]]
; CHECK: }
define void @foo2() {
entry:
%call = tail call i32* @qux()
%tcall = bitcast i32* %call to i8*
%0 = tail call i8* @llvm.objc.unsafeClaimAutoreleasedReturnValue(i8* %tcall) nounwind
tail call void @bar(i8* %0)
ret void
}
; CHECK-LABEL: define i8* @foo3(
; CHECK: call i8* @returnsArg(
; CHECK-NEXT: call void asm sideeffect
define i8* @foo3(i8* %a) {
%call = call i8* @returnsArg(i8* %a)
call i8* @llvm.objc.retainAutoreleasedReturnValue(i8* %call)
ret i8* %call
}
; CHECK-LABEL: define i8* @foo4(
; CHECK: call i8* @returnsArg(
; CHECK-NEXT: call void asm sideeffect
define i8* @foo4(i8* %a) {
%call = call i8* @returnsArg(i8* %a)
call i8* @llvm.objc.retainAutoreleasedReturnValue(i8* %a)
ret i8* %call
}
declare i32* @qux()
declare i8* @llvm.objc.retainAutoreleasedReturnValue(i8*)
declare i8* @llvm.objc.unsafeClaimAutoreleasedReturnValue(i8*)
declare void @bar(i8*)
declare i8* @returnsArg(i8* returned)
!llvm.module.flags = !{!0}
!0 = !{i32 1, !"clang.arc.retainAutoreleasedReturnValueMarker", !"mov\09r7, r7\09\09@ marker for return value optimization"}
; CHECK: attributes [[NUW]] = { nounwind }
|
