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1; RUN: opt -passes=mem2reg -S %s -o - | FileCheck %s --implicit-check-not="#dbg_"2 3; CHECK: #dbg_value(i64 0, ![[#]], !DIExpression(DW_OP_LLVM_fragment, 0, 32),4 5;; The store has a debug intrinsic attached to it with a fragment size6;; different to the base alloca debug intrinsic fragment size. Check that7;; mem2reg doesn't think this store is "untagged" for that base variable. If8;; that were the case mem2reg would insert a dbg.value covering the entire9;; variable, which isn't the right thing to do here. This example looks weird10;; and not particularly compelling, but this was encountered in the wild on11;; "real code".12 13;; Reduced from this C++ (which itself has been reduced).14;; class a {15;; public:16;; a(float, float);17;; };18;; class d {19;; protected:20;; float b[4];21;; 22;; public:23;; float e() { return b[0]; }24;; float f() { return b[1]; }25;; };26;; class g : public d {27;; public:28;; void operator*=(g) {29;; {30;; float __attribute__((nodebug)) c = b[2], __attribute__((nodebug)) h = b[0];31;; b[0] = c;32;; b[1] = h;33;; }34;; }35;; };36;; g get();37;; void i() {38;; g __attribute__((nodebug)) j = get();39;; g k = j;40;; k *= j;41;; a(k.e(), k.f());42;; }43 44define dso_local i64 @_Z3funv() #0 !dbg !10 {45entry:46 %retval.sroa.0 = alloca i64, align 8, !DIAssignID !2047 call void @llvm.dbg.assign(metadata i1 undef, metadata !19, metadata !DIExpression(), metadata !20, metadata ptr %retval.sroa.0, metadata !DIExpression()), !dbg !2148 store i64 0, ptr %retval.sroa.0, align 8, !dbg !22, !DIAssignID !2349 call void @llvm.dbg.assign(metadata i64 0, metadata !19, metadata !DIExpression(DW_OP_LLVM_fragment, 0, 32), metadata !23, metadata ptr %retval.sroa.0, metadata !DIExpression()), !dbg !2150 ret i64 051}52 53declare void @llvm.dbg.declare(metadata, metadata, metadata) #154declare void @llvm.dbg.assign(metadata, metadata, metadata, metadata, metadata, metadata) #155 56!llvm.dbg.cu = !{!0}57!llvm.module.flags = !{!2, !3, !4, !5, !6, !7, !8}58!llvm.ident = !{!9}59 60!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus_14, file: !1, producer: "clang version 17.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, splitDebugInlining: false, nameTableKind: None)61!1 = !DIFile(filename: "test.cpp", directory: "/")62!2 = !{i32 7, !"Dwarf Version", i32 5}63!3 = !{i32 2, !"Debug Info Version", i32 3}64!4 = !{i32 1, !"wchar_size", i32 4}65!5 = !{i32 8, !"PIC Level", i32 2}66!6 = !{i32 7, !"PIE Level", i32 2}67!7 = !{i32 7, !"uwtable", i32 2}68!8 = !{i32 7, !"debug-info-assignment-tracking", i1 true}69!9 = !{!"clang version 17.0.0"}70!10 = distinct !DISubprogram(name: "fun", linkageName: "_Z3funv", scope: !1, file: !1, line: 2, type: !11, scopeLine: 2, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !18)71!11 = !DISubroutineType(types: !12)72!12 = !{!13}73!13 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "Pair", file: !1, line: 1, size: 64, flags: DIFlagTypePassByValue, elements: !14, identifier: "_ZTS4Pair")74!14 = !{!15, !17}75!15 = !DIDerivedType(tag: DW_TAG_member, name: "A", scope: !13, file: !1, line: 1, baseType: !16, size: 32)76!16 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)77!17 = !DIDerivedType(tag: DW_TAG_member, name: "B", scope: !13, file: !1, line: 1, baseType: !16, size: 32, offset: 32)78!18 = !{!19}79!19 = !DILocalVariable(name: "X", scope: !10, file: !1, line: 3, type: !13)80!20 = distinct !DIAssignID()81!21 = !DILocation(line: 0, scope: !10)82!22 = !DILocation(line: 3, column: 8, scope: !10)83!23 = distinct !DIAssignID()84!24 = !DILocation(line: 4, column: 3, scope: !10)85