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1; RUN: opt -passes=instcombine -S %s -o - | FileCheck %s2 3; In this example, the cast from ptr to ptr becomes trivially dead. We should4; salvage its debug info.5 6; C source:7; void use_as_void(ptr);8; void f(ptr p) {9; int *q = (int *)p;10; use_as_void(q);11; }12 13; ModuleID = '<stdin>'14source_filename = "t.c"15target datalayout = "e-m:w-i64:64-f80:128-n8:16:32:64-S128"16target triple = "x86_64-pc-windows-msvc19.11.25508"17 18; Function Attrs: nounwind uwtable19define void @f(ptr %p) !dbg !11 {20entry:21 call void @llvm.dbg.value(metadata ptr %p, metadata !16, metadata !DIExpression()), !dbg !1822 call void @llvm.dbg.value(metadata ptr %p, metadata !17, metadata !DIExpression()), !dbg !2023 call void @use_as_void(ptr %p), !dbg !2224 ret void, !dbg !2325}26 27; CHECK-LABEL: define void @f(ptr %p)28; CHECK: #dbg_value(ptr %p, ![[P_VAR:[0-9]+]], !DIExpression(),29; CHECK-NOT: bitcast30; CHECK: #dbg_value(ptr %p, ![[Q_VAR:[0-9]+]], !DIExpression(),31; CHECK-NOT: bitcast32; CHECK: ret void33 34; CHECK: ![[P_VAR]] = !DILocalVariable(name: "p", {{.*}})35; CHECK: ![[Q_VAR]] = !DILocalVariable(name: "q", {{.*}})36 37declare void @use_as_void(ptr)38 39declare void @llvm.dbg.value(metadata, metadata, metadata)40 41!llvm.dbg.cu = !{!0}42!llvm.module.flags = !{!6, !7, !8, !9}43!llvm.ident = !{!10}44 45!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)46!1 = !DIFile(filename: "t.c", directory: "C:\5Csrc\5Cllvm-project\5Cbuild", checksumkind: CSK_MD5, checksum: "56c40617ada23a8cccbd9a16bcec57af")47!2 = !{}48!3 = !{!4}49!4 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !5, size: 64)50!5 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)51!6 = !{i32 2, !"CodeView", i32 1}52!7 = !{i32 2, !"Debug Info Version", i32 3}53!8 = !{i32 1, !"wchar_size", i32 2}54!9 = !{i32 7, !"PIC Level", i32 2}55!10 = !{!"clang version 6.0.0 "}56!11 = distinct !DISubprogram(name: "f", scope: !1, file: !1, line: 2, type: !12, isLocal: false, isDefinition: true, scopeLine: 2, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !15)57!12 = !DISubroutineType(types: !13)58!13 = !{null, !14}59!14 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 64)60!15 = !{!16, !17}61!16 = !DILocalVariable(name: "p", arg: 1, scope: !11, file: !1, line: 2, type: !14)62!17 = !DILocalVariable(name: "q", scope: !11, file: !1, line: 3, type: !4)63!18 = !DILocation(line: 2, column: 14, scope: !11)64!19 = !DILocation(line: 3, column: 12, scope: !11)65!20 = !DILocation(line: 3, column: 8, scope: !11)66!21 = !DILocation(line: 4, column: 15, scope: !11)67!22 = !DILocation(line: 4, column: 3, scope: !11)68!23 = !DILocation(line: 5, column: 1, scope: !11)69