1; Test CFG simplify removal of branch instructions.
2;
3; RUN: opt < %s -simplifycfg -S | FileCheck %s
4; RUN: opt < %s -passes=simplify-cfg -S | FileCheck %s
5
6define void @test1() {
7        br label %1
8        ret void
9; CHECK-LABEL: @test1(
10; CHECK-NEXT: ret void
11}
12
13define void @test2() {
14        ret void
15        ret void
16; CHECK-LABEL: @test2(
17; CHECK-NEXT: ret void
18; CHECK-NEXT: }
19}
20
21define void @test3(i1 %T) {
22        br i1 %T, label %1, label %1
23        ret void
24; CHECK-LABEL: @test3(
25; CHECK-NEXT: ret void
26}
27
28
29; PR5795
30define void @test5(i32 %A) {
31  switch i32 %A, label %return [
32    i32 2, label %1
33    i32 10, label %2
34  ]
35
36  ret void
37
38  ret void
39
40return:                                           ; preds = %entry
41  ret void
42; CHECK-LABEL: @test5(
43; CHECK-NEXT: ret void
44}
45
46
47; PR14893
48define i8 @test6f() {
49; CHECK-LABEL: @test6f
50; CHECK: alloca i8, align 1
51; CHECK-NEXT: call i8 @test6g
52; CHECK-NEXT: icmp eq i8 %tmp, 0
53; CHECK-NEXT: load i8, i8* %r, align 1, !dbg !{{[0-9]+$}}
54
55bb0:
56  %r = alloca i8, align 1
57  %tmp = call i8 @test6g(i8* %r)
58  %tmp1 = icmp eq i8 %tmp, 0
59  br i1 %tmp1, label %bb2, label %bb1
60bb1:
61  %tmp3 = load i8, i8* %r, align 1, !range !2, !tbaa !1, !dbg !5
62  %tmp4 = icmp eq i8 %tmp3, 1
63  br i1 %tmp4, label %bb2, label %bb3
64bb2:
65  br label %bb3
66bb3:
67  %tmp6 = phi i8 [ 0, %bb2 ], [ 1, %bb1 ]
68  ret i8 %tmp6
69}
70declare i8 @test6g(i8*)
71
72!llvm.dbg.cu = !{!3}
73!llvm.module.flags = !{!8, !9}
74
75!0 = !{!1, !1, i64 0}
76!1 = !{!"foo"}
77!2 = !{i8 0, i8 2}
78!3 = distinct !DICompileUnit(language: DW_LANG_C99, file: !7, producer: "clang", isOptimized: false, runtimeVersion: 0, emissionKind: 1, enums: !4, subprograms: !4, globals: !4)
79!4 = !{}
80!5 = !DILocation(line: 23, scope: !6)
81!6 = distinct !DISubprogram(name: "foo", scope: !3, file: !7, line: 1, type: !DISubroutineType(types: !4), isLocal: false, isDefinition: true, scopeLine: 1, flags: DIFlagPrototyped, isOptimized: false, variables: !4)
82!7 = !DIFile(filename: "foo.c", directory: "/")
83!8 = !{i32 2, !"Dwarf Version", i32 2}
84!9 = !{i32 2, !"Debug Info Version", i32 3}
85