1; RUN: opt < %s -gvn -S | FileCheck %s
2;
3; Produced at -O2 from:
4; int a, b;
5; void f1(int *p1) {
6;   if (b)
7;     a = 1;
8;   if (a && *p1)
9;     f4();
10; }
11; int f2(int);
12; void f3(void) {
13;   a = f2(1);
14;   f1(&a);
15; }
16target datalayout = "e-m:o-i64:64-i128:128-n32:64-S128"
17target triple = "arm64-apple-ios"
18
19@a = common global i32 0, align 4
20@b = common global i32 0, align 4
21
22; Function Attrs: nounwind
23define void @f3() #0 !dbg !12 {
24entry:
25  ; Verify that the call still has a debug location after GVN.
26  ; CHECK: %call = tail call i32 @f2(i32 1) #{{[0-9]}}, !dbg
27  %call = tail call i32 @f2(i32 1) #3, !dbg !36
28  store i32 %call, i32* @a, align 4, !dbg !36, !tbaa !25
29  tail call void @llvm.dbg.value(metadata i32* @a, i64 0, metadata !11, metadata !21) #3, !dbg !39
30  %0 = load i32, i32* @b, align 4, !dbg !39, !tbaa !25
31  %tobool.i = icmp eq i32 %0, 0, !dbg !39
32  br i1 %tobool.i, label %if.end.i, label %land.lhs.true.i.thread, !dbg !40
33
34land.lhs.true.i.thread:                           ; preds = %entry
35  store i32 1, i32* @a, align 4, !dbg !41, !tbaa !25
36  br label %if.then.3.i, !dbg !42
37
38if.end.i:                                         ; preds = %entry
39  ; This instruction has no debug location -- in this
40  ; particular case it was removed by a bug in SimplifyCFG.
41  %.pr = load i32, i32* @a, align 4
42
43  ; GVN is supposed to replace the load of %.pr with a direct reference to %call.
44  ; CHECK: %tobool2.i = icmp eq i32 %call, 0, !dbg
45  %tobool2.i = icmp eq i32 %.pr, 0, !dbg !43
46  br i1 %tobool2.i, label %f1.exit, label %if.then.3.i, !dbg !43
47
48if.then.3.i:                                      ; preds = %if.end.i, %land.lhs.true.i.thread
49  %call.i = tail call i32 bitcast (i32 (...)* @f4 to i32 ()*)() #3, !dbg !44
50  br label %f1.exit, !dbg !44
51
52f1.exit:                                          ; preds = %if.end.i, %if.then.3.i
53  ret void, !dbg !45
54}
55
56declare i32 @f2(i32)
57declare i32 @f4(...)
58
59; Function Attrs: nounwind readnone
60declare void @llvm.dbg.value(metadata, i64, metadata, metadata) #2
61
62attributes #0 = { nounwind }
63attributes #2 = { nounwind readnone }
64attributes #3 = { nounwind }
65
66!llvm.dbg.cu = !{!0}
67!llvm.module.flags = !{!18, !19}
68!llvm.ident = !{!20}
69
70!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 3.8.0 (trunk 245562) (llvm/trunk 245569)", isOptimized: true, runtimeVersion: 0, emissionKind: 1, enums: !2, subprograms: !3, globals: !15)
71!1 = !DIFile(filename: "test.c", directory: "/")
72!2 = !{}
73!3 = !{!4, !12}
74!4 = distinct !DISubprogram(name: "f1", scope: !1, file: !1, line: 2, type: !6, isLocal: false, isDefinition: true, scopeLine: 2, flags: DIFlagPrototyped, isOptimized: true, variables: !10)
75!6 = !DISubroutineType(types: !7)
76!7 = !{null, !8}
77!8 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !9, size: 64, align: 64)
78!9 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
79!10 = !{!11}
80!11 = !DILocalVariable(name: "p1", arg: 1, scope: !4, file: !1, line: 2, type: !8)
81!12 = distinct !DISubprogram(name: "f3", scope: !1, file: !1, line: 9, type: !13, isLocal: false, isDefinition: true, scopeLine: 9, flags: DIFlagPrototyped, isOptimized: true, variables: !2)
82!13 = !DISubroutineType(types: !14)
83!14 = !{null}
84!15 = !{!16, !17}
85!16 = !DIGlobalVariable(name: "a", scope: !0, file: !1, line: 1, type: !9, isLocal: false, isDefinition: true, variable: i32* @a)
86!17 = !DIGlobalVariable(name: "b", scope: !0, file: !1, line: 1, type: !9, isLocal: false, isDefinition: true, variable: i32* @b)
87!18 = !{i32 2, !"Dwarf Version", i32 2}
88!19 = !{i32 2, !"Debug Info Version", i32 3}
89!20 = !{!"clang version 3.8.0 (trunk 245562) (llvm/trunk 245569)"}
90!21 = !DIExpression()
91!22 = !DILocation(line: 2, scope: !4)
92!23 = !DILocation(line: 3, scope: !24)
93!24 = distinct !DILexicalBlock(scope: !4, file: !1, line: 3)
94!25 = !{!26, !26, i64 0}
95!26 = !{!"int", !27, i64 0}
96!27 = !{!"omnipotent char", !28, i64 0}
97!28 = !{!"Simple C/C++ TBAA"}
98!29 = !DILocation(line: 3, scope: !4)
99!30 = !DILocation(line: 4, scope: !24)
100!31 = !DILocation(line: 5, scope: !32)
101!32 = distinct !DILexicalBlock(scope: !4, file: !1, line: 5)
102!33 = !DILocation(line: 5, scope: !4)
103!34 = !DILocation(line: 6, scope: !32)
104!35 = !DILocation(line: 7, scope: !4)
105!36 = !DILocation(line: 5, scope: !32, inlinedAt: !37)
106!37 = distinct !DILocation(line: 11, scope: !12)
107!38 = !DILocation(line: 10, scope: !12)
108!39 = !DILocation(line: 2, scope: !4, inlinedAt: !37)
109!40 = !DILocation(line: 3, scope: !24, inlinedAt: !37)
110!41 = !DILocation(line: 3, scope: !4, inlinedAt: !37)
111!42 = !DILocation(line: 4, scope: !24, inlinedAt: !37)
112!43 = !DILocation(line: 5, scope: !4, inlinedAt: !37)
113!44 = !DILocation(line: 6, scope: !32, inlinedAt: !37)
114!45 = !DILocation(line: 12, scope: !12)
115