128 lines
6.5 KiB
LLVM
128 lines
6.5 KiB
LLVM
; RUN: opt -instcombine -S %s | FileCheck %s
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;; Ensure that debug uses of a select are replaced when the select is replaced
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;; with one of its operands in InstCombine's replacedSelectWithOperand.
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;; Based on IR generated from this source, compiled with -O2 -g:
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;;
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;; extern void* glob;
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;; struct Thing {
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;; void *ptr;
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;; void *get() {return ptr;}
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;; };
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;; Thing *two(void *in) {
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;; if ((long)in & 1)
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;; return nullptr;
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;; return static_cast<Thing *>(in);
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;; }
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;; void one() {
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;; if (Thing *a = two(glob))
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;; // Without the fix we lose 'this' (a) in the inlined call below.
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;; glob = a->get();
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;; }
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;; Look at the instruction:
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;; %retval.0.i = select i1 %tobool.not.i, %struct.Thing* %2, %struct.Thing* null
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;; Note that %2 is a bitcast of %0.
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;; InstCombine replaces the use of %retval.0.i in if.then with %0 because
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;; if.then is only branched to when retval.0.is not null. Ensure that debug use
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;; of %retval.0.i is also replaced with %0.
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; CHECK: if.then:
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; CHECK-NEXT: call void @llvm.dbg.value(metadata i8* %0, metadata ![[THIS:[0-9]+]], metadata !DIExpression())
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; CHECK: ![[THIS]] = !DILocalVariable(name: "this",
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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%struct.Thing = type { i8* }
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@glob = external dso_local local_unnamed_addr global i8*, align 8
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define dso_local void @_Z3onev() local_unnamed_addr !dbg !29 {
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entry:
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%0 = load i8*, i8** @glob, align 8, !dbg !35
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call void @llvm.dbg.value(metadata i8* %0, metadata !22, metadata !DIExpression()), !dbg !40
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%1 = ptrtoint i8* %0 to i64, !dbg !42
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%and.i = and i64 %1, 1, !dbg !43
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%tobool.not.i = icmp eq i64 %and.i, 0, !dbg !42
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%2 = bitcast i8* %0 to %struct.Thing*, !dbg !44
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%retval.0.i = select i1 %tobool.not.i, %struct.Thing* %2, %struct.Thing* null, !dbg !44
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call void @llvm.dbg.value(metadata %struct.Thing* %retval.0.i, metadata !33, metadata !DIExpression()), !dbg !45
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%tobool.not = icmp eq %struct.Thing* %retval.0.i, null, !dbg !46
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br i1 %tobool.not, label %if.end, label %if.then, !dbg !47
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if.then: ; preds = %entry
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call void @llvm.dbg.value(metadata %struct.Thing* %retval.0.i, metadata !48, metadata !DIExpression()), !dbg !51
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%ptr.i = getelementptr inbounds %struct.Thing, %struct.Thing* %retval.0.i, i64 0, i32 0, !dbg !53
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%3 = load i8*, i8** %ptr.i, align 8, !dbg !53
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store i8* %3, i8** @glob, align 8, !dbg !56
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br label %if.end, !dbg !57
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if.end: ; preds = %if.then, %entry
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ret void, !dbg !58
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}
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declare void @llvm.dbg.value(metadata, metadata, metadata)
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!14, !15, !16}
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!llvm.ident = !{!17}
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!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)
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!1 = !DIFile(filename: "test.cpp", directory: "/")
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!2 = !{}
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!3 = !{!4, !5}
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!4 = !DIBasicType(name: "long int", size: 64, encoding: DW_ATE_signed)
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!5 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !6, size: 64)
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!6 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "Thing", file: !1, line: 2, size: 64, flags: DIFlagTypePassByValue, elements: !7, identifier: "_ZTS5Thing")
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!7 = !{!8, !10}
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!8 = !DIDerivedType(tag: DW_TAG_member, name: "ptr", scope: !6, file: !1, line: 3, baseType: !9, size: 64)
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!9 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 64)
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!10 = !DISubprogram(name: "get", linkageName: "_ZN5Thing3getEv", scope: !6, file: !1, line: 4, type: !11, scopeLine: 4, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized)
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!11 = !DISubroutineType(types: !12)
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!12 = !{!9, !13}
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!13 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !6, size: 64, flags: DIFlagArtificial | DIFlagObjectPointer)
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!14 = !{i32 7, !"Dwarf Version", i32 4}
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!15 = !{i32 2, !"Debug Info Version", i32 3}
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!16 = !{i32 1, !"wchar_size", i32 4}
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!17 = !{!"clang version 13.0.0"}
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!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)
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!19 = !DISubroutineType(types: !20)
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!20 = !{!5, !9}
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!21 = !{!22}
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!22 = !DILocalVariable(name: "in", arg: 1, scope: !18, file: !1, line: 6, type: !9)
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!23 = !DILocation(line: 0, scope: !18)
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!24 = !DILocation(line: 7, column: 7, scope: !25)
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!25 = distinct !DILexicalBlock(scope: !18, file: !1, line: 7, column: 7)
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!26 = !DILocation(line: 7, column: 16, scope: !25)
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!27 = !DILocation(line: 7, column: 7, scope: !18)
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!28 = !DILocation(line: 10, column: 1, scope: !18)
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!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)
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!30 = !DISubroutineType(types: !31)
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!31 = !{null}
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!32 = !{!33}
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!33 = !DILocalVariable(name: "a", scope: !34, file: !1, line: 12, type: !5)
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!34 = distinct !DILexicalBlock(scope: !29, file: !1, line: 12, column: 14)
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!35 = !DILocation(line: 12, column: 22, scope: !34)
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!40 = !DILocation(line: 0, scope: !18, inlinedAt: !41)
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!41 = distinct !DILocation(line: 12, column: 18, scope: !34)
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!42 = !DILocation(line: 7, column: 7, scope: !25, inlinedAt: !41)
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!43 = !DILocation(line: 7, column: 16, scope: !25, inlinedAt: !41)
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!44 = !DILocation(line: 7, column: 7, scope: !18, inlinedAt: !41)
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!45 = !DILocation(line: 0, scope: !34)
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!46 = !DILocation(line: 12, column: 14, scope: !34)
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!47 = !DILocation(line: 12, column: 14, scope: !29)
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!48 = !DILocalVariable(name: "this", arg: 1, scope: !49, type: !5, flags: DIFlagArtificial | DIFlagObjectPointer)
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!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)
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!50 = !{!48}
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!51 = !DILocation(line: 0, scope: !49, inlinedAt: !52)
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!52 = distinct !DILocation(line: 14, column: 15, scope: !34)
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!53 = !DILocation(line: 4, column: 23, scope: !49, inlinedAt: !52)
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!56 = !DILocation(line: 14, column: 10, scope: !34)
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!57 = !DILocation(line: 14, column: 5, scope: !34)
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!58 = !DILocation(line: 15, column: 1, scope: !29)
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!59 = !DILocation(line: 0, scope: !49)
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!60 = !DILocation(line: 4, column: 23, scope: !49)
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!61 = !DILocation(line: 4, column: 16, scope: !49)
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