1; RUN: opt < %s -S -simplifycfg | FileCheck %s 2 3; Note: This patch fixes the regression introduced by pr38762. 4; 5; When SimplifyCFG changes the PHI node into a select instruction, the debug 6; information becomes ambiguous. It causes the debugger to display unreached 7; lines and invalid variable values. 8; 9; When the function 'hoistAllInstructionsInto' hoist a basic block: 10; - Remove their dbg.values. 11; - Set their debug locations to the values from the insertion point. 12; 13; But, if one of the instructions being hoisted is a debug intrinsic from an 14; inlined function, assigning it the debug location from the insertion point 15; will create a mismatch between the intrinsic's subprogram and the location's 16; subprogram, causing the assertion "Expected inlined-at fields to agree" in 17; SelectionDAG". 18 19; IR generated with: 20; clang -S -g -gno-column-info -O2 -emit-llvm pr39243.cpp -o pr39243.ll -mllvm -opt-bisect-limit=103 21 22; // pr39243.cpp 23; union onion { 24; double dd; 25; int ii[2]; 26; }; 27; 28; int alpha; 29; int bravo(); 30; 31; int charlie() { 32; int delta = 0; 33; return bravo(); 34; } 35; 36; int echo(onion foxtrot) { 37; alpha = foxtrot.ii[0]; 38; if (alpha) { 39; int golf = bravo(); 40; return -golf; 41; } 42; alpha = foxtrot.ii[1]; 43; return -charlie(); 44; } 45 46; Change the debug locations associated with the PHI nodes being promoted, to 47; the debug locations from the insertion point in the dominant block. 48 49; CHECK-LABEL: entry 50; CHECK: %foxtrot.sroa.0.0.extract.trunc = trunc i64 %foxtrot.coerce to i32 51; CHECK: %tobool = icmp eq i32 %foxtrot.sroa.0.0.extract.trunc, 0 52; CHECK: %foxtrot.sroa.2.0.extract.shift = lshr i64 %foxtrot.coerce, 32 53; CHECK-NOT: call void @llvm.dbg.value(metadata i32 %foxtrot.sroa.2.0.extract.trunc, metadata !30, metadata !DIExpression(DW_OP_LLVM_fragment, 32, 32)), !dbg !34 54; CHECK: %foxtrot.sroa.2.0.extract.trunc = trunc i64 %foxtrot.sroa.2.0.extract.shift to i32 55; CHECK: store i32 %foxtrot.sroa.2.0.extract.trunc, i32* @alpha, align 4, !dbg !25 56; CHECK-NOT: call void @llvm.dbg.value(metadata i32 0, metadata !15, metadata !DIExpression()), !dbg !43 57 58; ModuleID = 'pr39243.cpp' 59source_filename = "pr39243.cpp" 60target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128" 61target triple = "x86_64-pc-linux-gnu" 62 63@alpha = dso_local local_unnamed_addr global i32 0, align 4, !dbg !0 64 65define dso_local i32 @_Z7charliev() local_unnamed_addr #0 { 66entry: 67 %call = tail call i32 @_Z5bravov() 68 ret i32 %call 69} 70 71declare dso_local i32 @_Z5bravov() local_unnamed_addr #1 72 73define dso_local i32 @_Z4echo5onion(i64 %foxtrot.coerce) local_unnamed_addr #0 !dbg !18 { 74entry: 75 %foxtrot.sroa.0.0.extract.trunc = trunc i64 %foxtrot.coerce to i32 76 store i32 %foxtrot.sroa.0.0.extract.trunc, i32* @alpha, align 4 77 %tobool = icmp eq i32 %foxtrot.sroa.0.0.extract.trunc, 0 78 br i1 %tobool, label %if.end, label %return 79 80if.end: ; preds = %entry 81 %foxtrot.sroa.2.0.extract.shift = lshr i64 %foxtrot.coerce, 32 82 %foxtrot.sroa.2.0.extract.trunc = trunc i64 %foxtrot.sroa.2.0.extract.shift to i32 83 call void @llvm.dbg.value(metadata i32 %foxtrot.sroa.2.0.extract.trunc, metadata !30, metadata !DIExpression(DW_OP_LLVM_fragment, 32, 32)), !dbg !34 84 store i32 %foxtrot.sroa.2.0.extract.trunc, i32* @alpha, align 4, !dbg !42 85 call void @llvm.dbg.value(metadata i32 0, metadata !15, metadata !DIExpression()), !dbg !43 86 br label %return 87 88return: ; preds = %entry, %if.end 89 %call.i = tail call i32 @_Z5bravov() 90 %retval.0 = sub nsw i32 0, %call.i 91 ret i32 %retval.0 92} 93 94declare void @llvm.dbg.value(metadata, metadata, metadata) #2 95 96!llvm.dbg.cu = !{!2} 97!llvm.module.flags = !{!7, !8, !9} 98!llvm.ident = !{!10} 99 100!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression()) 101!1 = distinct !DIGlobalVariable(name: "alpha", scope: !2, file: !3, line: 6, type: !6, isLocal: false, isDefinition: true) 102!2 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !3, producer: "clang version 8.0.0 (trunk 344502)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, nameTableKind: None) 103!3 = !DIFile(filename: "pr39243.cpp", directory: ".") 104!4 = !{} 105!5 = !{!0} 106!6 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed) 107!7 = !{i32 2, !"Dwarf Version", i32 4} 108!8 = !{i32 2, !"Debug Info Version", i32 3} 109!9 = !{i32 1, !"wchar_size", i32 4} 110!10 = !{!"clang version 8.0.0 (trunk 344502)"} 111!11 = distinct !DISubprogram(name: "charlie", linkageName: "_Z7charliev", scope: !3, file: !3, line: 9, type: !12, isLocal: false, isDefinition: true, scopeLine: 9, flags: DIFlagPrototyped, isOptimized: true, unit: !2, retainedNodes: !14) 112!12 = !DISubroutineType(types: !13) 113!13 = !{!6} 114!14 = !{!15} 115!15 = !DILocalVariable(name: "delta", scope: !11, file: !3, line: 10, type: !6) 116!18 = distinct !DISubprogram(name: "echo", linkageName: "_Z4echo5onion", scope: !3, file: !3, line: 14, type: !19, isLocal: false, isDefinition: true, scopeLine: 14, flags: DIFlagPrototyped, isOptimized: true, unit: !2, retainedNodes: !29) 117!19 = !DISubroutineType(types: !20) 118!20 = !{!6, !21} 119!21 = distinct !DICompositeType(tag: DW_TAG_union_type, name: "onion", file: !3, line: 1, size: 64, flags: DIFlagTypePassByValue, elements: !22, identifier: "_ZTS5onion") 120!22 = !{!23, !25} 121!23 = !DIDerivedType(tag: DW_TAG_member, name: "dd", scope: !21, file: !3, line: 2, baseType: !24, size: 64) 122!24 = !DIBasicType(name: "double", size: 64, encoding: DW_ATE_float) 123!25 = !DIDerivedType(tag: DW_TAG_member, name: "ii", scope: !21, file: !3, line: 3, baseType: !26, size: 64) 124!26 = !DICompositeType(tag: DW_TAG_array_type, baseType: !6, size: 64, elements: !27) 125!27 = !{!28} 126!28 = !DISubrange(count: 2) 127!29 = !{!30} 128!30 = !DILocalVariable(name: "foxtrot", arg: 1, scope: !18, file: !3, line: 14, type: !21) 129!34 = !DILocation(line: 14, scope: !18) 130!42 = !DILocation(line: 20, scope: !18) 131!43 = !DILocation(line: 10, scope: !11, inlinedAt: !44) 132!44 = distinct !DILocation(line: 21, scope: !18) 133