1; RUN: opt -jump-threading -S < %s | FileCheck %s
2
3declare void @side_effect(i32)
4
5define void @test0(i32 %i, i32 %len) {
6; CHECK-LABEL: @test0(
7 entry:
8  call void @side_effect(i32 0)
9  %i.inc = add nuw i32 %i, 1
10  %c0 = icmp ult i32 %i.inc, %len
11  br i1 %c0, label %left, label %right
12
13 left:
14; CHECK: entry:
15; CHECK: br i1 %c0, label %left0, label %right
16
17; CHECK: left0:
18; CHECK: call void @side_effect
19; CHECK-NOT: br i1 %c1
20; CHECK: call void @side_effect
21  call void @side_effect(i32 0)
22  %c1 = icmp ult i32 %i, %len
23  br i1 %c1, label %left0, label %right
24
25 left0:
26  call void @side_effect(i32 0)
27  ret void
28
29 right:
30  %t = phi i32 [ 1, %left ], [ 2, %entry ]
31  call void @side_effect(i32 %t)
32  ret void
33}
34
35define void @test1(i32 %i, i32 %len) {
36; CHECK-LABEL: @test1(
37 entry:
38  call void @side_effect(i32 0)
39  %i.inc = add nsw i32 %i, 1
40  %c0 = icmp slt i32 %i.inc, %len
41  br i1 %c0, label %left, label %right
42
43 left:
44; CHECK: entry:
45; CHECK: br i1 %c0, label %left0, label %right
46
47; CHECK: left0:
48; CHECK: call void @side_effect
49; CHECK-NOT: br i1 %c1
50; CHECK: call void @side_effect
51  call void @side_effect(i32 0)
52  %c1 = icmp slt i32 %i, %len
53  br i1 %c1, label %left0, label %right
54
55 left0:
56  call void @side_effect(i32 0)
57  ret void
58
59 right:
60  %t = phi i32 [ 1, %left ], [ 2, %entry ]
61  call void @side_effect(i32 %t)
62  ret void
63}
64
65define void @test2(i32 %i, i32 %len, i1* %c.ptr) {
66; CHECK-LABEL: @test2(
67
68; CHECK: entry:
69; CHECK: br i1 %c0, label %cont, label %right
70; CHECK: cont:
71; CHECK: br i1 %c, label %left0, label %right
72; CHECK: left0:
73; CHECK: call void @side_effect(i32 0)
74; CHECK: call void @side_effect(i32 0)
75 entry:
76  call void @side_effect(i32 0)
77  %i.inc = add nsw i32 %i, 1
78  %c0 = icmp slt i32 %i.inc, %len
79  br i1 %c0, label %cont, label %right
80
81 cont:
82  %c = load i1, i1* %c.ptr
83  br i1 %c, label %left, label %right
84
85 left:
86  call void @side_effect(i32 0)
87  %c1 = icmp slt i32 %i, %len
88  br i1 %c1, label %left0, label %right
89
90 left0:
91  call void @side_effect(i32 0)
92  ret void
93
94 right:
95  %t = phi i32 [ 1, %left ], [ 2, %entry ], [ 3, %cont ]
96  call void @side_effect(i32 %t)
97  ret void
98}
99