1; RUN: opt < %s -S -instcombine -instcombine-lower-dbg-declare=0 | FileCheck %s
2
3; In this example, instcombine wants to turn "local" into an i64, since that's
4; how it is stored. It should keep the debug info referring to the alloca when
5; it does the replacement.
6
7; C source:
8; struct Foo {
9;   int x, y;
10; };
11; void escape(const void*);
12; void f(struct Foo *p) {
13;   struct Foo local;
14;   *(__int64 *)&local = *(__int64 *)p;
15;   escape(&local);
16; }
17
18; ModuleID = '<stdin>'
19source_filename = "t.c"
20target datalayout = "e-m:w-i64:64-f80:128-n8:16:32:64-S128"
21target triple = "x86_64-pc-windows-msvc19.11.25508"
22
23%struct.Foo = type { i32, i32 }
24
25define void @f(%struct.Foo* %p) !dbg !11 {
26entry:
27  %local = alloca %struct.Foo, align 4
28  %0 = bitcast %struct.Foo* %local to i8*, !dbg !24
29  call void @llvm.dbg.declare(metadata %struct.Foo* %local, metadata !22, metadata !DIExpression()), !dbg !25
30  %1 = bitcast %struct.Foo* %p to i64*, !dbg !26
31  %2 = load i64, i64* %1, align 8, !dbg !26, !tbaa !27
32  %3 = bitcast %struct.Foo* %local to i64*, !dbg !31
33  store i64 %2, i64* %3, align 4, !dbg !32, !tbaa !27
34  %4 = bitcast %struct.Foo* %local to i8*, !dbg !33
35  call void @escape(i8* %4), !dbg !34
36  %5 = bitcast %struct.Foo* %local to i8*, !dbg !35
37  ret void, !dbg !35
38}
39
40; CHECK-LABEL: define void @f(%struct.Foo* %p)
41; CHECK: %local = alloca i64, align 8
42; CHECK: call void @llvm.dbg.declare(metadata i64* %local, metadata !22, metadata !DIExpression())
43; CHECK: [[simplified:%.*]] = bitcast i64* %local to i8*
44;
45; Another dbg.value for "local" would be redundant here.
46; CHECK-NOT: call void @llvm.dbg.value(metadata i8* [[simplified]], metadata !22, metadata !DIExpression())
47;
48; CHECK: call void @escape(i8* [[simplified]])
49; CHECK: ret void
50
51declare void @llvm.dbg.declare(metadata, metadata, metadata)
52
53declare void @escape(i8*)
54
55!llvm.dbg.cu = !{!0}
56!llvm.module.flags = !{!6, !7, !8, !9}
57!llvm.ident = !{!10}
58
59!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 6.0.0 ", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, retainedTypes: !3)
60!1 = !DIFile(filename: "t.c", directory: "C:\5Csrc\5Cllvm-project\5Cbuild", checksumkind: CSK_MD5, checksum: "d7473625866433067a75fd7d03d2abf7")
61!2 = !{}
62!3 = !{!4}
63!4 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !5, size: 64)
64!5 = !DIBasicType(name: "long long int", size: 64, encoding: DW_ATE_signed)
65!6 = !{i32 2, !"CodeView", i32 1}
66!7 = !{i32 2, !"Debug Info Version", i32 3}
67!8 = !{i32 1, !"wchar_size", i32 2}
68!9 = !{i32 7, !"PIC Level", i32 2}
69!10 = !{!"clang version 6.0.0 "}
70!11 = distinct !DISubprogram(name: "f", scope: !1, file: !1, line: 5, type: !12, isLocal: false, isDefinition: true, scopeLine: 5, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !20)
71!12 = !DISubroutineType(types: !13)
72!13 = !{null, !14}
73!14 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !15, size: 64)
74!15 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "Foo", file: !1, line: 1, size: 64, elements: !16)
75!16 = !{!17, !19}
76!17 = !DIDerivedType(tag: DW_TAG_member, name: "x", scope: !15, file: !1, line: 2, baseType: !18, size: 32)
77!18 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
78!19 = !DIDerivedType(tag: DW_TAG_member, name: "y", scope: !15, file: !1, line: 2, baseType: !18, size: 32, offset: 32)
79!20 = !{!21, !22}
80!21 = !DILocalVariable(name: "p", arg: 1, scope: !11, file: !1, line: 5, type: !14)
81!22 = !DILocalVariable(name: "local", scope: !11, file: !1, line: 6, type: !15)
82!23 = !DILocation(line: 5, column: 20, scope: !11)
83!24 = !DILocation(line: 6, column: 3, scope: !11)
84!25 = !DILocation(line: 6, column: 14, scope: !11)
85!26 = !DILocation(line: 7, column: 24, scope: !11)
86!27 = !{!28, !28, i64 0}
87!28 = !{!"long long", !29, i64 0}
88!29 = !{!"omnipotent char", !30, i64 0}
89!30 = !{!"Simple C/C++ TBAA"}
90!31 = !DILocation(line: 7, column: 3, scope: !11)
91!32 = !DILocation(line: 7, column: 22, scope: !11)
92!33 = !DILocation(line: 8, column: 10, scope: !11)
93!34 = !DILocation(line: 8, column: 3, scope: !11)
94!35 = !DILocation(line: 9, column: 1, scope: !11)
95