1; RUN: opt -S < %s -mem2reg -verify | FileCheck %s
2
3target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
4target triple = "x86_64-apple-macosx10.13.0"
5
6; Original source (with some whitespace removed):
7;
8;   extern int *getp();
9;   extern int cond();
10;   int get1() { return *getp(); }
11;   int get2(int *p) { return *p; }
12;   int bug(int *p) {
13;     if (cond()) return get1();
14;     else return get2(p);
15;   }
16
17define i32 @get1() !dbg !8 {
18  %1 = call i32* (...) @getp(), !dbg !12
19  %2 = load i32, i32* %1, align 4, !dbg !13
20  ret i32 %2, !dbg !14
21}
22
23declare i32* @getp(...)
24
25define i32 @get2(i32*) !dbg !15 {
26  %2 = alloca i32*, align 8
27  store i32* %0, i32** %2, align 8
28  call void @llvm.dbg.declare(metadata i32** %2, metadata !19, metadata !DIExpression()), !dbg !20
29  %3 = load i32*, i32** %2, align 8, !dbg !21
30  %4 = load i32, i32* %3, align 4, !dbg !22
31  ret i32 %4, !dbg !23
32}
33
34declare void @llvm.dbg.declare(metadata, metadata, metadata)
35
36; CHECK-LABEL: define i32 @bug
37define i32 @bug(i32*) !dbg !24 {
38  %2 = alloca i32, align 4
39  %3 = alloca i32*, align 8
40  store i32* %0, i32** %3, align 8
41  call void @llvm.dbg.declare(metadata i32** %3, metadata !25, metadata !DIExpression()), !dbg !26
42  %4 = call i32 (...) @cond(), !dbg !27
43  %5 = icmp ne i32 %4, 0, !dbg !27
44  br i1 %5, label %6, label %8, !dbg !29
45
46; <label>:6:                                      ; preds = %1
47  %7 = call i32 @get1(), !dbg !30
48  store i32 %7, i32* %2, align 4, !dbg !31
49  br label %11, !dbg !31
50
51; <label>:8:                                      ; preds = %1
52  %9 = load i32*, i32** %3, align 8, !dbg !32
53  %10 = call i32 @get2(i32* %9), !dbg !33
54  store i32 %10, i32* %2, align 4, !dbg !34
55  br label %11, !dbg !34
56
57; <label>:11:                                     ; preds = %8, %6
58  %12 = load i32, i32* %2, align 4, !dbg !35
59  ret i32 %12, !dbg !35
60
61  ; CHECK: [[phi:%.*]] = phi i32 [ {{.*}} ], [ {{.*}} ], !dbg [[mergedLoc:![0-9]+]]
62  ; CHECK-NEXT: ret i32 [[phi]], !dbg [[retLoc:![0-9]+]]
63}
64
65; CHECK: [[commonScope:![0-9]+]] = distinct !DILexicalBlock(scope: {{.*}}, file: !1, line: 15, column: 7)
66; CHECK: [[mergedLoc]] = !DILocation(line: 0, scope: [[commonScope]])
67; CHECK: [[retLoc]] = !DILocation(line: 23, column: 1
68
69declare i32 @cond(...)
70
71!llvm.dbg.cu = !{!0}
72!llvm.module.flags = !{!3, !4, !5, !6}
73!llvm.ident = !{!7}
74
75!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "Apple LLVM version 9.1.0 (clang-902.2.37.2)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
76!1 = !DIFile(filename: "bug.c", directory: "/bug")
77!2 = !{}
78!3 = !{i32 2, !"Dwarf Version", i32 4}
79!4 = !{i32 2, !"Debug Info Version", i32 3}
80!5 = !{i32 1, !"wchar_size", i32 4}
81!6 = !{i32 7, !"PIC Level", i32 2}
82!7 = !{!"Apple LLVM version 9.1.0 (clang-902.2.37.2)"}
83!8 = distinct !DISubprogram(name: "get1", scope: !1, file: !1, line: 6, type: !9, isLocal: false, isDefinition: true, scopeLine: 6, isOptimized: false, unit: !0, retainedNodes: !2)
84!9 = !DISubroutineType(types: !10)
85!10 = !{!11}
86!11 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
87!12 = !DILocation(line: 7, column: 11, scope: !8)
88!13 = !DILocation(line: 7, column: 10, scope: !8)
89!14 = !DILocation(line: 7, column: 3, scope: !8)
90!15 = distinct !DISubprogram(name: "get2", scope: !1, file: !1, line: 10, type: !16, isLocal: false, isDefinition: true, scopeLine: 10, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2)
91!16 = !DISubroutineType(types: !17)
92!17 = !{!11, !18}
93!18 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !11, size: 64)
94!19 = !DILocalVariable(name: "p", arg: 1, scope: !15, file: !1, line: 10, type: !18)
95!20 = !DILocation(line: 10, column: 15, scope: !15)
96!21 = !DILocation(line: 11, column: 11, scope: !15)
97!22 = !DILocation(line: 11, column: 10, scope: !15)
98!23 = !DILocation(line: 11, column: 3, scope: !15)
99!24 = distinct !DISubprogram(name: "bug", scope: !1, file: !1, line: 14, type: !16, isLocal: false, isDefinition: true, scopeLine: 14, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2)
100!25 = !DILocalVariable(name: "p", arg: 1, scope: !24, file: !1, line: 14, type: !18)
101!26 = !DILocation(line: 14, column: 14, scope: !24)
102!27 = !DILocation(line: 15, column: 7, scope: !28)
103!28 = distinct !DILexicalBlock(scope: !24, file: !1, line: 15, column: 7)
104!29 = !DILocation(line: 15, column: 7, scope: !24)
105!30 = !DILocation(line: 16, column: 12, scope: !28)
106!31 = !DILocation(line: 16, column: 5, scope: !28)
107!32 = !DILocation(line: 18, column: 17, scope: !28)
108!33 = !DILocation(line: 18, column: 12, scope: !28)
109!34 = !DILocation(line: 18, column: 5, scope: !28)
110!35 = !DILocation(line: 23, column: 1, scope: !24)
111