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1; RUN: opt -passes=instcombine -S %s | FileCheck %s2 3;; Ensure that debug uses of a select are replaced when the select is replaced4;; with one of its operands in InstCombine's replacedSelectWithOperand.5 6;; Based on IR generated from this source, compiled with -O2 -g:7;;8;; extern void* glob;9;; struct Thing {10;; void *ptr;11;; void *get() {return ptr;}12;; };13;; Thing *two(void *in) {14;; if ((long)in & 1)15;; return nullptr;16;; return static_cast<Thing *>(in);17;; }18;; void one() {19;; if (Thing *a = two(glob))20;; // Without the fix we lose 'this' (a) in the inlined call below.21;; glob = a->get();22;; }23 24;; Look at the instruction:25;; %retval.0.i = select i1 %tobool.not.i, ptr %2, ptr null26;; Note that %2 is a bitcast of %0.27;; InstCombine replaces the use of %retval.0.i in if.then with %0 because28;; if.then is only branched to when retval.0.is not null. Ensure that debug use29;; of %retval.0.i is also replaced with %0.30 31; CHECK: if.then:32; CHECK-NEXT: #dbg_value(ptr %0, ![[THIS:[0-9]+]], !DIExpression(),33; CHECK: ![[THIS]] = !DILocalVariable(name: "this",34 35target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"36target triple = "x86_64-unknown-linux-gnu"37 38%struct.Thing = type { ptr }39 40@glob = external dso_local local_unnamed_addr global ptr, align 841 42define dso_local void @_Z3onev() local_unnamed_addr !dbg !29 {43entry:44 %0 = load ptr, ptr @glob, align 8, !dbg !3545 call void @llvm.dbg.value(metadata ptr %0, metadata !22, metadata !DIExpression()), !dbg !4046 %1 = ptrtoint ptr %0 to i64, !dbg !4247 %and.i = and i64 %1, 1, !dbg !4348 %tobool.not.i = icmp eq i64 %and.i, 0, !dbg !4249 %2 = bitcast ptr %0 to ptr, !dbg !4450 %retval.0.i = select i1 %tobool.not.i, ptr %2, ptr null, !dbg !4451 call void @llvm.dbg.value(metadata ptr %retval.0.i, metadata !33, metadata !DIExpression()), !dbg !4552 %tobool.not = icmp eq ptr %retval.0.i, null, !dbg !4653 br i1 %tobool.not, label %if.end, label %if.then, !dbg !4754 55if.then: ; preds = %entry56 call void @llvm.dbg.value(metadata ptr %retval.0.i, metadata !48, metadata !DIExpression()), !dbg !5157 %ptr.i = getelementptr inbounds %struct.Thing, ptr %retval.0.i, i64 0, i32 0, !dbg !5358 %3 = load ptr, ptr %ptr.i, align 8, !dbg !5359 store ptr %3, ptr @glob, align 8, !dbg !5660 br label %if.end, !dbg !5761 62if.end: ; preds = %if.then, %entry63 ret void, !dbg !5864}65 66declare void @llvm.dbg.value(metadata, metadata, metadata)67 68!llvm.dbg.cu = !{!0}69!llvm.module.flags = !{!14, !15, !16}70!llvm.ident = !{!17}71 72!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus_14, file: !1, producer: "clang version 13.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, retainedTypes: !3, splitDebugInlining: false, nameTableKind: None)73!1 = !DIFile(filename: "test.cpp", directory: "/")74!2 = !{}75!3 = !{!4, !5}76!4 = !DIBasicType(name: "long int", size: 64, encoding: DW_ATE_signed)77!5 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !6, size: 64)78!6 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "Thing", file: !1, line: 2, size: 64, flags: DIFlagTypePassByValue, elements: !7, identifier: "_ZTS5Thing")79!7 = !{!8, !10}80!8 = !DIDerivedType(tag: DW_TAG_member, name: "ptr", scope: !6, file: !1, line: 3, baseType: !9, size: 64)81!9 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 64)82!10 = !DISubprogram(name: "get", linkageName: "_ZN5Thing3getEv", scope: !6, file: !1, line: 4, type: !11, scopeLine: 4, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized)83!11 = !DISubroutineType(types: !12)84!12 = !{!9, !13}85!13 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !6, size: 64, flags: DIFlagArtificial | DIFlagObjectPointer)86!14 = !{i32 7, !"Dwarf Version", i32 4}87!15 = !{i32 2, !"Debug Info Version", i32 3}88!16 = !{i32 1, !"wchar_size", i32 4}89!17 = !{!"clang version 13.0.0"}90!18 = distinct !DISubprogram(name: "two", linkageName: "_Z3twoPv", scope: !1, file: !1, line: 6, type: !19, scopeLine: 6, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !21)91!19 = !DISubroutineType(types: !20)92!20 = !{!5, !9}93!21 = !{!22}94!22 = !DILocalVariable(name: "in", arg: 1, scope: !18, file: !1, line: 6, type: !9)95!23 = !DILocation(line: 0, scope: !18)96!24 = !DILocation(line: 7, column: 7, scope: !25)97!25 = distinct !DILexicalBlock(scope: !18, file: !1, line: 7, column: 7)98!26 = !DILocation(line: 7, column: 16, scope: !25)99!27 = !DILocation(line: 7, column: 7, scope: !18)100!28 = !DILocation(line: 10, column: 1, scope: !18)101!29 = distinct !DISubprogram(name: "one", linkageName: "_Z3onev", scope: !1, file: !1, line: 11, type: !30, scopeLine: 11, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !32)102!30 = !DISubroutineType(types: !31)103!31 = !{null}104!32 = !{!33}105!33 = !DILocalVariable(name: "a", scope: !34, file: !1, line: 12, type: !5)106!34 = distinct !DILexicalBlock(scope: !29, file: !1, line: 12, column: 14)107!35 = !DILocation(line: 12, column: 22, scope: !34)108!40 = !DILocation(line: 0, scope: !18, inlinedAt: !41)109!41 = distinct !DILocation(line: 12, column: 18, scope: !34)110!42 = !DILocation(line: 7, column: 7, scope: !25, inlinedAt: !41)111!43 = !DILocation(line: 7, column: 16, scope: !25, inlinedAt: !41)112!44 = !DILocation(line: 7, column: 7, scope: !18, inlinedAt: !41)113!45 = !DILocation(line: 0, scope: !34)114!46 = !DILocation(line: 12, column: 14, scope: !34)115!47 = !DILocation(line: 12, column: 14, scope: !29)116!48 = !DILocalVariable(name: "this", arg: 1, scope: !49, type: !5, flags: DIFlagArtificial | DIFlagObjectPointer)117!49 = distinct !DISubprogram(name: "get", linkageName: "_ZN5Thing3getEv", scope: !6, file: !1, line: 4, type: !11, scopeLine: 4, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, declaration: !10, retainedNodes: !50)118!50 = !{!48}119!51 = !DILocation(line: 0, scope: !49, inlinedAt: !52)120!52 = distinct !DILocation(line: 14, column: 15, scope: !34)121!53 = !DILocation(line: 4, column: 23, scope: !49, inlinedAt: !52)122!56 = !DILocation(line: 14, column: 10, scope: !34)123!57 = !DILocation(line: 14, column: 5, scope: !34)124!58 = !DILocation(line: 15, column: 1, scope: !29)125!59 = !DILocation(line: 0, scope: !49)126!60 = !DILocation(line: 4, column: 23, scope: !49)127!61 = !DILocation(line: 4, column: 16, scope: !49)128