1; RUN: opt -objc-arc-contract -S < %s | FileCheck %s
2
3target datalayout = "e-p:64:64:64"
4
5declare i8* @objc_retain(i8*)
6declare void @objc_release(i8*)
7declare void @use_pointer(i8*)
8
9@x = external global i8*
10
11; CHECK-LABEL: define void @test0(
12; CHECK: entry:
13; CHECK-NEXT: tail call void @objc_storeStrong(i8** @x, i8* %p) [[NUW:#[0-9]+]]
14; CHECK-NEXT: ret void
15; CHECK-NEXT: }
16define void @test0(i8* %p) {
17entry:
18  %0 = tail call i8* @objc_retain(i8* %p) nounwind
19  %tmp = load i8** @x, align 8
20  store i8* %0, i8** @x, align 8
21  tail call void @objc_release(i8* %tmp) nounwind
22  ret void
23}
24
25; Don't do this if the load is volatile.
26
27;      CHECK: define void @test1(i8* %p) {
28; CHECK-NEXT: entry:
29; CHECK-NEXT:   %0 = tail call i8* @objc_retain(i8* %p) [[NUW]]
30; CHECK-NEXT:   %tmp = load volatile i8** @x, align 8
31; CHECK-NEXT:   store i8* %0, i8** @x, align 8
32; CHECK-NEXT:   tail call void @objc_release(i8* %tmp) [[NUW]]
33; CHECK-NEXT:   ret void
34; CHECK-NEXT: }
35define void @test1(i8* %p) {
36entry:
37  %0 = tail call i8* @objc_retain(i8* %p) nounwind
38  %tmp = load volatile i8** @x, align 8
39  store i8* %0, i8** @x, align 8
40  tail call void @objc_release(i8* %tmp) nounwind
41  ret void
42}
43
44; Don't do this if the store is volatile.
45
46;      CHECK: define void @test2(i8* %p) {
47; CHECK-NEXT: entry:
48; CHECK-NEXT:   %0 = tail call i8* @objc_retain(i8* %p) [[NUW]]
49; CHECK-NEXT:   %tmp = load i8** @x, align 8
50; CHECK-NEXT:   store volatile i8* %0, i8** @x, align 8
51; CHECK-NEXT:   tail call void @objc_release(i8* %tmp) [[NUW]]
52; CHECK-NEXT:   ret void
53; CHECK-NEXT: }
54define void @test2(i8* %p) {
55entry:
56  %0 = tail call i8* @objc_retain(i8* %p) nounwind
57  %tmp = load i8** @x, align 8
58  store volatile i8* %0, i8** @x, align 8
59  tail call void @objc_release(i8* %tmp) nounwind
60  ret void
61}
62
63; Don't do this if there's a use of the old pointer value between the store
64; and the release.
65
66; CHECK:      define void @test3(i8* %newValue) {
67; CHECK-NEXT: entry:
68; CHECK-NEXT:   %x0 = tail call i8* @objc_retain(i8* %newValue) [[NUW]]
69; CHECK-NEXT:   %x1 = load i8** @x, align 8
70; CHECK-NEXT:   store i8* %x0, i8** @x, align 8
71; CHECK-NEXT:   tail call void @use_pointer(i8* %x1), !clang.arc.no_objc_arc_exceptions !0
72; CHECK-NEXT:   tail call void @objc_release(i8* %x1) [[NUW]], !clang.imprecise_release !0
73; CHECK-NEXT:   ret void
74; CHECK-NEXT: }
75define void @test3(i8* %newValue) {
76entry:
77  %x0 = tail call i8* @objc_retain(i8* %newValue) nounwind
78  %x1 = load i8** @x, align 8
79  store i8* %newValue, i8** @x, align 8
80  tail call void @use_pointer(i8* %x1), !clang.arc.no_objc_arc_exceptions !0
81  tail call void @objc_release(i8* %x1) nounwind, !clang.imprecise_release !0
82  ret void
83}
84
85; Like test3, but with an icmp use instead of a call, for good measure.
86
87; CHECK:      define i1 @test4(i8* %newValue, i8* %foo) {
88; CHECK-NEXT: entry:
89; CHECK-NEXT:   %x0 = tail call i8* @objc_retain(i8* %newValue) [[NUW]]
90; CHECK-NEXT:   %x1 = load i8** @x, align 8
91; CHECK-NEXT:   store i8* %x0, i8** @x, align 8
92; CHECK-NEXT:   %t = icmp eq i8* %x1, %foo
93; CHECK-NEXT:   tail call void @objc_release(i8* %x1) [[NUW]], !clang.imprecise_release !0
94; CHECK-NEXT:   ret i1 %t
95; CHECK-NEXT: }
96define i1 @test4(i8* %newValue, i8* %foo) {
97entry:
98  %x0 = tail call i8* @objc_retain(i8* %newValue) nounwind
99  %x1 = load i8** @x, align 8
100  store i8* %newValue, i8** @x, align 8
101  %t = icmp eq i8* %x1, %foo
102  tail call void @objc_release(i8* %x1) nounwind, !clang.imprecise_release !0
103  ret i1 %t
104}
105
106; Do form an objc_storeStrong here, because the use is before the store.
107
108; CHECK: define i1 @test5(i8* %newValue, i8* %foo) {
109; CHECK: %t = icmp eq i8* %x1, %foo
110; CHECK: tail call void @objc_storeStrong(i8** @x, i8* %newValue) [[NUW]]
111; CHECK: }
112define i1 @test5(i8* %newValue, i8* %foo) {
113entry:
114  %x0 = tail call i8* @objc_retain(i8* %newValue) nounwind
115  %x1 = load i8** @x, align 8
116  %t = icmp eq i8* %x1, %foo
117  store i8* %newValue, i8** @x, align 8
118  tail call void @objc_release(i8* %x1) nounwind, !clang.imprecise_release !0
119  ret i1 %t
120}
121
122; Like test5, but the release is before the store.
123
124; CHECK: define i1 @test6(i8* %newValue, i8* %foo) {
125; CHECK: %t = icmp eq i8* %x1, %foo
126; CHECK: tail call void @objc_storeStrong(i8** @x, i8* %newValue) [[NUW]]
127; CHECK: }
128define i1 @test6(i8* %newValue, i8* %foo) {
129entry:
130  %x0 = tail call i8* @objc_retain(i8* %newValue) nounwind
131  %x1 = load i8** @x, align 8
132  tail call void @objc_release(i8* %x1) nounwind, !clang.imprecise_release !0
133  %t = icmp eq i8* %x1, %foo
134  store i8* %newValue, i8** @x, align 8
135  ret i1 %t
136}
137
138; Like test0, but there's no store, so don't form an objc_storeStrong.
139
140;      CHECK-LABEL: define void @test7(
141; CHECK-NEXT: entry:
142; CHECK-NEXT:   %0 = tail call i8* @objc_retain(i8* %p) [[NUW]]
143; CHECK-NEXT:   %tmp = load i8** @x, align 8
144; CHECK-NEXT:   tail call void @objc_release(i8* %tmp) [[NUW]]
145; CHECK-NEXT:   ret void
146; CHECK-NEXT: }
147define void @test7(i8* %p) {
148entry:
149  %0 = tail call i8* @objc_retain(i8* %p) nounwind
150  %tmp = load i8** @x, align 8
151  tail call void @objc_release(i8* %tmp) nounwind
152  ret void
153}
154
155; Like test0, but there's no retain, so don't form an objc_storeStrong.
156
157;      CHECK-LABEL: define void @test8(
158; CHECK-NEXT: entry:
159; CHECK-NEXT:   %tmp = load i8** @x, align 8
160; CHECK-NEXT:   store i8* %p, i8** @x, align 8
161; CHECK-NEXT:   tail call void @objc_release(i8* %tmp) [[NUW]]
162; CHECK-NEXT:   ret void
163; CHECK-NEXT: }
164define void @test8(i8* %p) {
165entry:
166  %tmp = load i8** @x, align 8
167  store i8* %p, i8** @x, align 8
168  tail call void @objc_release(i8* %tmp) nounwind
169  ret void
170}
171
172!0 = !{}
173
174; CHECK: attributes [[NUW]] = { nounwind }
175