1; RUN: opt -simplifycfg -S < %s | FileCheck %s
2
3define void @ifconvertstore(i32 %m, i32* %A, i32* %B, i32 %C, i32 %D) {
4entry:
5  %arrayidx = getelementptr inbounds i32* %B, i64 0
6  %0 = load i32* %arrayidx, align 4
7  %add = add nsw i32 %0, %C
8  %arrayidx2 = getelementptr inbounds i32* %A, i64 0
9
10; First store to the location.
11  store i32 %add, i32* %arrayidx2, align 4
12  %arrayidx4 = getelementptr inbounds i32* %B, i64 1
13  %1 = load i32* %arrayidx4, align 4
14  %add5 = add nsw i32 %1, %D
15  %cmp6 = icmp sgt i32 %add5, %C
16  br i1 %cmp6, label %if.then, label %ret.end
17
18; Make sure we speculate stores like the following one. It is cheap compared to
19; a mispredicated branch.
20; CHECK-LABEL: @ifconvertstore(
21; CHECK: %add5.add = select i1 %cmp6, i32 %add5, i32 %add
22; CHECK: store i32 %add5.add, i32* %arrayidx2, align 4
23if.then:
24  store i32 %add5, i32* %arrayidx2, align 4
25  br label %ret.end
26
27ret.end:
28  ret void
29}
30
31define void @noifconvertstore1(i32 %m, i32* %A, i32* %B, i32 %C, i32 %D) {
32entry:
33  %arrayidx = getelementptr inbounds i32* %B, i64 0
34  %0 = load i32* %arrayidx, align 4
35  %add = add nsw i32 %0, %C
36  %arrayidx2 = getelementptr inbounds i32* %A, i64 0
37
38; Store to a different location.
39  store i32 %add, i32* %arrayidx, align 4
40  %arrayidx4 = getelementptr inbounds i32* %B, i64 1
41  %1 = load i32* %arrayidx4, align 4
42  %add5 = add nsw i32 %1, %D
43  %cmp6 = icmp sgt i32 %add5, %C
44  br i1 %cmp6, label %if.then, label %ret.end
45
46; CHECK-LABEL: @noifconvertstore1(
47; CHECK-NOT: select
48if.then:
49  store i32 %add5, i32* %arrayidx2, align 4
50  br label %ret.end
51
52ret.end:
53  ret void
54}
55
56declare void @unknown_fun()
57
58define void @noifconvertstore2(i32 %m, i32* %A, i32* %B, i32 %C, i32 %D) {
59entry:
60  %arrayidx = getelementptr inbounds i32* %B, i64 0
61  %0 = load i32* %arrayidx, align 4
62  %add = add nsw i32 %0, %C
63  %arrayidx2 = getelementptr inbounds i32* %A, i64 0
64
65; First store to the location.
66  store i32 %add, i32* %arrayidx2, align 4
67  call void @unknown_fun()
68  %arrayidx4 = getelementptr inbounds i32* %B, i64 1
69  %1 = load i32* %arrayidx4, align 4
70  %add5 = add nsw i32 %1, %D
71  %cmp6 = icmp sgt i32 %add5, %C
72  br i1 %cmp6, label %if.then, label %ret.end
73
74; CHECK-LABEL: @noifconvertstore2(
75; CHECK-NOT: select
76if.then:
77  store i32 %add5, i32* %arrayidx2, align 4
78  br label %ret.end
79
80ret.end:
81  ret void
82}
83
84define void @noifconvertstore_volatile(i32 %m, i32* %A, i32* %B, i32 %C, i32 %D) {
85entry:
86  %arrayidx = getelementptr inbounds i32* %B, i64 0
87  %0 = load i32* %arrayidx, align 4
88  %add = add nsw i32 %0, %C
89  %arrayidx2 = getelementptr inbounds i32* %A, i64 0
90
91; First store to the location.
92  store i32 %add, i32* %arrayidx2, align 4
93  %arrayidx4 = getelementptr inbounds i32* %B, i64 1
94  %1 = load i32* %arrayidx4, align 4
95  %add5 = add nsw i32 %1, %D
96  %cmp6 = icmp sgt i32 %add5, %C
97  br i1 %cmp6, label %if.then, label %ret.end
98
99; Make sure we don't speculate volatile stores.
100; CHECK-LABEL: @noifconvertstore_volatile(
101; CHECK-NOT: select
102if.then:
103  store volatile i32 %add5, i32* %arrayidx2, align 4
104  br label %ret.end
105
106ret.end:
107  ret void
108}
109