1; RUN: opt  %s -instcombine -S | FileCheck %s
2
3; Test sinking of dbg.values when instcombine sinks associated instructions.
4
5declare void @llvm.dbg.value(metadata, metadata, metadata)
6
7; This GEP is sunk, but can be folded into a DIExpression. Check that it
8; gets folded. The dbg.value should be duplicated in the block its sunk
9; into, to maximise liveness.
10;
11; CHECK-LABEL: define i32 @foo(i32*
12; CHECK:       call void @llvm.dbg.value(metadata i32* %a, metadata !{{[0-9]+}},
13; CHECK-SAME:  metadata !DIExpression(DW_OP_plus_uconst, 4, DW_OP_stack_value))
14; CHECK-NEXT:  br label %sink1
15
16define i32 @foo(i32 *%a) !dbg !7 {
17entry:
18  %gep = getelementptr i32, i32 *%a, i32 1
19  call void @llvm.dbg.value(metadata i32 *%gep, metadata !16, metadata !12), !dbg !15
20  br label %sink1
21
22sink1:
23; CHECK-LABEL: sink1:
24; CHECK:       call void @llvm.dbg.value(metadata i32* %gep,
25; CHECK-SAME:                    metadata !{{[0-9]+}}, metadata !DIExpression())
26; CHECK-NEXT:  load
27  %0 = load i32, i32* %gep, align 4, !dbg !15
28  ret i32 %0, !dbg !15
29}
30
31; In this example the GEP cannot (yet) be salvaged. Check that not only is the
32; dbg.value sunk, but an undef dbg.value is left to terminate any earlier
33; value range.
34
35; CHECK-LABEL: define i32 @bar(
36; CHECK:       call void @llvm.dbg.value(metadata <vscale x 4 x i32>* undef,
37; CHECK-NEXT:  br label %sink2
38
39define i32 @bar(<vscale x 4 x i32>* %a, i32 %b) !dbg !70 {
40entry:
41  %gep = getelementptr <vscale x 4 x i32>, <vscale x 4 x i32>* %a, i32 %b
42  call void @llvm.dbg.value(metadata <vscale x 4 x i32>* %gep, metadata !73, metadata !12), !dbg !74
43  br label %sink2
44
45sink2:
46; CHECK-LABEL: sink2:
47; CHECK:       call void @llvm.dbg.value(metadata <vscale x 4 x i32>* %gep,
48; CHECK-SAME:                    metadata !{{[0-9]+}}, metadata !DIExpression())
49; CHECK-NEXT:  load
50; CHECK-NEXT:  extractelement
51; CHECK-NEXT:  ret
52  %0 = load <vscale x 4 x i32>, <vscale x 4 x i32>* %gep
53  %extract = extractelement <vscale x 4 x i32> %0, i32 1
54  ret i32 %extract
55}
56
57; This GEP is sunk, and has multiple debug uses in the same block. Check that
58; only the last use is cloned into the sunk block, and that both of the
59; original dbg.values are salvaged.
60;
61; CHECK-LABEL: define i32 @baz(i32*
62; CHECK:       call void @llvm.dbg.value(metadata i32* %a, metadata !{{[0-9]+}},
63; CHECK-SAME:  metadata !DIExpression(DW_OP_plus_uconst, 4, DW_OP_stack_value))
64; CHECK-NEXT:  call void @llvm.dbg.value(metadata i32* %a, metadata !{{[0-9]+}},
65; CHECK-SAME:  metadata !DIExpression(DW_OP_plus_uconst, 4, DW_OP_plus_uconst, 5, DW_OP_stack_value))
66; CHECK-NEXT:  br label %sink1
67
68define i32 @baz(i32 *%a) !dbg !80 {
69entry:
70  %gep = getelementptr i32, i32 *%a, i32 1
71  call void @llvm.dbg.value(metadata i32 *%gep, metadata !83, metadata !12), !dbg !84
72  call void @llvm.dbg.value(metadata i32 *%gep, metadata !83, metadata !DIExpression(DW_OP_plus_uconst, 5)), !dbg !85
73  br label %sink1
74
75sink1:
76; CHECK-LABEL: sink1:
77; CHECK:       call void @llvm.dbg.value(metadata i32* %gep,
78; CHECK-SAME:  metadata !{{[0-9]+}}, metadata !DIExpression(DW_OP_plus_uconst, 5))
79; CHECK-NEXT:  load
80  %0 = load i32, i32* %gep, align 4, !dbg !85
81  ret i32 %0, !dbg !85
82}
83
84!llvm.dbg.cu = !{!0}
85!llvm.module.flags = !{!3, !4, !5}
86!llvm.ident = !{!6}
87
88!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
89!1 = !DIFile(filename: "a.c", directory: ".")
90!2 = !{}
91!3 = !{i32 2, !"Dwarf Version", i32 4}
92!4 = !{i32 2, !"Debug Info Version", i32 3}
93!5 = !{i32 1, !"PIC Level", i32 2}
94!6 = !{!"clang"}
95!7 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 2, type: !8, isLocal: false, isDefinition: true, scopeLine: 3, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2)
96!8 = !DISubroutineType(types: !9)
97!9 = !{!10, !10}
98!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
99!11 = !DILocalVariable(name: "j", scope: !7, file: !1, line: 2, type: !10)
100!12 = !DIExpression()
101!15 = !DILocation(line: 5, column: 3, scope: !7)
102!16 = !DILocalVariable(name: "h", scope: !7, file: !1, line: 4, type: !10)
103!70 = distinct !DISubprogram(name: "bar", scope: !1, file: !1, line: 2, type: !71, isLocal: false, isDefinition: true, scopeLine: 3, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2)
104!71 = !DISubroutineType(types: !72)
105!72 = !{!10, !10, !10}
106!73 = !DILocalVariable(name: "k", scope: !70, file: !1, line: 2, type: !10)
107!74 = !DILocation(line: 5, column: 3, scope: !70)
108!80 = distinct !DISubprogram(name: "baz", scope: !1, file: !1, line: 2, type: !8, isLocal: false, isDefinition: true, scopeLine: 3, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2)
109!83 = !DILocalVariable(name: "l", scope: !80, file: !1, line: 2, type: !10)
110!84 = !DILocation(line: 5, column: 3, scope: !80)
111!85 = !DILocation(line: 6, column: 3, scope: !80)
112