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1; RUN: opt -S -objc-arc < %s | FileCheck %s
2
3declare void @use_pointer(i8*)
4declare i8* @returner()
5declare i8* @llvm.objc.retain(i8*)
6declare i8* @llvm.objc.autoreleaseReturnValue(i8*)
7declare i8* @llvm.objc.retainAutoreleasedReturnValue(i8*)
8
9; Clean up residue left behind after inlining.
10
11; CHECK-LABEL: define void @test0(
12; CHECK: entry:
13; CHECK-NEXT: ret void
14; CHECK-NEXT: }
15define void @test0(i8* %call.i) {
16entry:
17  %0 = tail call i8* @llvm.objc.retain(i8* %call.i) nounwind
18  %1 = tail call i8* @llvm.objc.autoreleaseReturnValue(i8* %0) nounwind
19  ret void
20}
21
22; Same as test0, but with slightly different use arrangements.
23
24; CHECK-LABEL: define void @test1(
25; CHECK: entry:
26; CHECK-NEXT: ret void
27; CHECK-NEXT: }
28define void @test1(i8* %call.i) {
29entry:
30  %0 = tail call i8* @llvm.objc.retain(i8* %call.i) nounwind
31  %1 = tail call i8* @llvm.objc.autoreleaseReturnValue(i8* %call.i) nounwind
32  ret void
33}
34
35; Delete a retainRV+autoreleaseRV even if the pointer is used.
36
37; CHECK-LABEL: define void @test24(
38; CHECK-NEXT: entry:
39; CHECK-NEXT:   call void @use_pointer(i8* %p)
40; CHECK-NEXT:   ret void
41; CHECK-NEXT: }
42define void @test24(i8* %p) {
43entry:
44  call i8* @llvm.objc.autoreleaseReturnValue(i8* %p) nounwind
45  call i8* @llvm.objc.retainAutoreleasedReturnValue(i8* %p) nounwind
46  call void @use_pointer(i8* %p)
47  ret void
48}
49
50; Check that we can delete the autoreleaseRV+retainAutoreleasedRV pair even in
51; presence of instructions added by the inliner as part of the return sequence.
52
53; 1) Noop instructions: bitcasts and zero-indices GEPs.
54
55; CHECK-LABEL: define i8* @testNoop(
56; CHECK: entry:
57; CHECK-NEXT: %noop0 = bitcast i8* %call.i to i64*
58; CHECK-NEXT: %noop1 = getelementptr i8, i8* %call.i, i32 0
59; CHECK-NEXT: ret i8* %call.i
60; CHECK-NEXT: }
61define i8* @testNoop(i8* %call.i) {
62entry:
63  %0 = tail call i8* @llvm.objc.autoreleaseReturnValue(i8* %call.i) nounwind
64  %noop0 = bitcast i8* %call.i to i64*
65  %noop1 = getelementptr i8, i8* %call.i, i32 0
66  %1 = tail call i8* @llvm.objc.retainAutoreleasedReturnValue(i8* %call.i) nounwind
67  ret i8* %call.i
68}
69
70; 2) Lifetime markers.
71
72declare void @llvm.lifetime.start.p0i8(i64, i8*)
73declare void @llvm.lifetime.end.p0i8(i64, i8*)
74
75; CHECK-LABEL: define i8* @testLifetime(
76; CHECK: entry:
77; CHECK-NEXT: %obj = alloca i8
78; CHECK-NEXT: call void @llvm.lifetime.start.p0i8(i64 8, i8* %obj)
79; CHECK-NEXT: call void @llvm.lifetime.end.p0i8(i64 8, i8* %obj)
80; CHECK-NEXT: ret i8* %call.i
81; CHECK-NEXT: }
82define i8* @testLifetime(i8* %call.i) {
83entry:
84  %obj = alloca i8
85  call void @llvm.lifetime.start.p0i8(i64 8, i8* %obj)
86  %0 = tail call i8* @llvm.objc.autoreleaseReturnValue(i8* %call.i) nounwind
87  call void @llvm.lifetime.end.p0i8(i64 8, i8* %obj)
88  %1 = tail call i8* @llvm.objc.retainAutoreleasedReturnValue(i8* %call.i) nounwind
89  ret i8* %call.i
90}
91
92; 3) Dynamic alloca markers.
93
94declare i8* @llvm.stacksave()
95declare void @llvm.stackrestore(i8*)
96
97; CHECK-LABEL: define i8* @testStack(
98; CHECK: entry:
99; CHECK-NEXT: %save = tail call i8* @llvm.stacksave()
100; CHECK-NEXT: %obj = alloca i8, i8 %arg
101; CHECK-NEXT: call void @llvm.stackrestore(i8* %save)
102; CHECK-NEXT: ret i8* %call.i
103; CHECK-NEXT: }
104define i8* @testStack(i8* %call.i, i8 %arg) {
105entry:
106  %save = tail call i8* @llvm.stacksave()
107  %obj = alloca i8, i8 %arg
108  %0 = tail call i8* @llvm.objc.autoreleaseReturnValue(i8* %call.i) nounwind
109  call void @llvm.stackrestore(i8* %save)
110  %1 = tail call i8* @llvm.objc.retainAutoreleasedReturnValue(i8* %call.i) nounwind
111  ret i8* %call.i
112}
113