1; RUN: opt < %s -basic-aa -dse -S | FileCheck %s
2
3declare noalias i8* @calloc(i64, i64)
4
5define i32* @test1() {
6; CHECK-LABEL: test1
7  %1 = tail call noalias i8* @calloc(i64 1, i64 4)
8  %2 = bitcast i8* %1 to i32*
9  ; This store is dead and should be removed
10  store i32 0, i32* %2, align 4
11; CHECK-NOT: store i32 0, i32* %2, align 4
12  ret i32* %2
13}
14
15define i32* @test2() {
16; CHECK-LABEL: test2
17  %1 = tail call noalias i8* @calloc(i64 1, i64 4)
18  %2 = bitcast i8* %1 to i32*
19  %3 = getelementptr i32, i32* %2, i32 5
20  store i32 0, i32* %3, align 4
21; CHECK-NOT: store i32 0, i32* %2, align 4
22  ret i32* %2
23}
24
25define i32* @test3(i32 *%arg) {
26; CHECK-LABEL: test3
27  store i32 0, i32* %arg, align 4
28; CHECK: store i32 0, i32* %arg, align 4
29  ret i32* %arg
30}
31
32declare void @clobber_memory(i8*)
33define i8* @test4() {
34; CHECK-LABEL: test4
35  %1 = tail call noalias i8* @calloc(i64 1, i64 4)
36  call void @clobber_memory(i8* %1)
37  store i8 0, i8* %1, align 4
38; CHECK: store i8 0, i8* %1, align 4
39  ret i8* %1
40}
41
42define i32* @test5() {
43; CHECK-LABEL: test5
44  %1 = tail call noalias i8* @calloc(i64 1, i64 4)
45  %2 = bitcast i8* %1 to i32*
46  store volatile i32 0, i32* %2, align 4
47; CHECK: store volatile i32 0, i32* %2, align 4
48  ret i32* %2
49}
50
51define i8* @test6() {
52; CHECK-LABEL: test6
53  %1 = tail call noalias i8* @calloc(i64 1, i64 4)
54  store i8 5, i8* %1, align 4
55; CHECK: store i8 5, i8* %1, align 4
56  ret i8* %1
57}
58
59define i8* @test7(i8 %arg) {
60; CHECK-LABEL: test7
61  %1 = tail call noalias i8* @calloc(i64 1, i64 4)
62  store i8 %arg, i8* %1, align 4
63; CHECK: store i8 %arg, i8* %1, align 4
64  ret i8* %1
65}
66
67define i8* @test8() {
68; CHECK-LABEL: test8
69; CHECK-NOT: store
70  %p = tail call noalias i8* @calloc(i64 1, i64 4)
71  store i8 0, i8* %p, align 1
72  %p.1 = getelementptr i8, i8* %p, i32 1
73  store i8 0, i8* %p.1, align 1
74  %p.3 = getelementptr i8, i8* %p, i32 3
75  store i8 0, i8* %p.3, align 1
76  %p.2 = getelementptr i8, i8* %p, i32 2
77  store i8 0, i8* %p.2, align 1
78  ret i8* %p
79}
80
81define i8* @test9() {
82; CHECK-LABEL: test9
83; CHECK-NEXT:    %p = tail call noalias i8* @calloc(i64 1, i64 4)
84; CHECK-NEXT:    store i8 5, i8* %p, align 1
85; CHECK-NEXT:    ret i8* %p
86
87  %p = tail call noalias i8* @calloc(i64 1, i64 4)
88  store i8 5, i8* %p, align 1
89  %p.1 = getelementptr i8, i8* %p, i32 1
90  store i8 0, i8* %p.1, align 1
91  %p.3 = getelementptr i8, i8* %p, i32 3
92  store i8 0, i8* %p.3, align 1
93  %p.2 = getelementptr i8, i8* %p, i32 2
94  store i8 0, i8* %p.2, align 1
95  ret i8* %p
96}
97
98define i8* @test10() {
99; CHECK-LABEL: @test10(
100; CHECK-NEXT:    [[P:%.*]] = tail call noalias i8* @calloc(i64 1, i64 4)
101; CHECK-NEXT:    [[P_3:%.*]] = getelementptr i8, i8* [[P]], i32 3
102; CHECK-NEXT:    store i8 5, i8* [[P_3]], align 1
103; CHECK-NEXT:    ret i8* [[P]]
104;
105
106  %p = tail call noalias i8* @calloc(i64 1, i64 4)
107  store i8 0, i8* %p, align 1
108  %p.1 = getelementptr i8, i8* %p, i32 1
109  store i8 0, i8* %p.1, align 1
110  %p.3 = getelementptr i8, i8* %p, i32 3
111  store i8 5, i8* %p.3, align 1
112  %p.2 = getelementptr i8, i8* %p, i32 2
113  store i8 0, i8* %p.2, align 1
114  ret i8* %p
115}
116
117define i8* @test11() {
118; CHECK-LABEL: @test11(
119; CHECK-NEXT:    [[P:%.*]] = tail call noalias i8* @calloc(i64 1, i64 4)
120; CHECK-NEXT:    ret i8* [[P]]
121;
122
123  %p = tail call noalias i8* @calloc(i64 1, i64 4)
124  store i8 0, i8* %p, align 1
125  %p.1 = getelementptr i8, i8* %p, i32 1
126  store i8 0, i8* %p.1, align 1
127  %p.3 = getelementptr i8, i8* %p, i32 3
128  store i8 5, i8* %p.3, align 1
129  %p.2 = getelementptr i8, i8* %p, i32 2
130  store i8 0, i8* %p.2, align 1
131  %p.3.2 = getelementptr i8, i8* %p, i32 3
132  store i8 0, i8* %p.3.2, align 1
133  ret i8* %p
134}
135
136define i8* @test12() {
137; CHECK-LABEL: @test12(
138; CHECK-NEXT:    [[P:%.*]] = tail call noalias i8* @calloc(i64 1, i64 4)
139; CHECK-NEXT:    [[P_3:%.*]] = getelementptr i8, i8* [[P]], i32 3
140; CHECK-NEXT:    store i8 5, i8* [[P_3]], align 1
141; CHECK-NEXT:    call void @use(i8* [[P]])
142; CHECK-NEXT:    [[P_3_2:%.*]] = getelementptr i8, i8* [[P]], i32 3
143; CHECK-NEXT:    store i8 0, i8* [[P_3_2]], align 1
144; CHECK-NEXT:    ret i8* [[P]]
145;
146
147  %p = tail call noalias i8* @calloc(i64 1, i64 4)
148  %p.3 = getelementptr i8, i8* %p, i32 3
149  store i8 5, i8* %p.3, align 1
150  call void @use(i8* %p)
151  %p.3.2 = getelementptr i8, i8* %p, i32 3
152  store i8 0, i8* %p.3.2, align 1
153  ret i8* %p
154}
155
156declare void @use(i8*) readonly
157