1; Test CFG simplify removal of branch instructions.
2;
3; RUN: opt < %s -simplifycfg -S | FileCheck %s
4
5define void @test1() {
6        br label %1
7        ret void
8; CHECK-LABEL: @test1(
9; CHECK-NEXT: ret void
10}
11
12define void @test2() {
13        ret void
14        ret void
15; CHECK-LABEL: @test2(
16; CHECK-NEXT: ret void
17; CHECK-NEXT: }
18}
19
20define void @test3(i1 %T) {
21        br i1 %T, label %1, label %1
22        ret void
23; CHECK-LABEL: @test3(
24; CHECK-NEXT: ret void
25}
26
27
28; PR5795
29define void @test5(i32 %A) {
30  switch i32 %A, label %return [
31    i32 2, label %1
32    i32 10, label %2
33  ]
34
35  ret void
36
37  ret void
38
39return:                                           ; preds = %entry
40  ret void
41; CHECK-LABEL: @test5(
42; CHECK-NEXT: ret void
43}
44
45
46; PR14893
47define i8 @test6f() {
48; CHECK-LABEL: @test6f
49; CHECK: alloca i8, align 1
50; CHECK-NEXT: call i8 @test6g
51; CHECK-NEXT: icmp eq i8 %tmp, 0
52; CHECK-NEXT: load i8* %r, align 1{{$}}
53
54bb0:
55  %r = alloca i8, align 1
56  %tmp = call i8 @test6g(i8* %r)
57  %tmp1 = icmp eq i8 %tmp, 0
58  br i1 %tmp1, label %bb2, label %bb1
59bb1:
60  %tmp3 = load i8* %r, align 1, !range !2, !tbaa !1
61  %tmp4 = icmp eq i8 %tmp3, 1
62  br i1 %tmp4, label %bb2, label %bb3
63bb2:
64  br label %bb3
65bb3:
66  %tmp6 = phi i8 [ 0, %bb2 ], [ 1, %bb1 ]
67  ret i8 %tmp6
68}
69declare i8 @test6g(i8*)
70
71!0 = !{!1, !1, i64 0}
72!1 = !{!"foo"}
73!2 = !{i8 0, i8 2}
74