1; RUN: opt < %s -S -simplifycfg -hoist-common-insts=true | FileCheck %s 2 3; SimplifyCFG can hoist any common code in the 'then' and 'else' blocks to 4; the 'if' basic block. 5; 6; For the special case, when hoisting the terminator instruction, its debug 7; location keep references to its basic block, causing the debug information 8; to become ambiguous. It causes the debugger to display unreached lines. 9 10; Check that hoisted instructions get unknown-location line numbers -- there 11; is no correct line number for code that has been common'd in this way. 12 13; IR generated with: 14; clang -S -g -gno-column-info -O2 -emit-llvm pr39187.cpp -o pr39187-g.ll -mllvm -opt-bisect-limit=10 15 16; // pr39187.cpp 17; int main() { 18; volatile int foo = 0; 19; 20; int beards = 0; 21; bool cond = foo == 4; 22; int bar = 0; 23; if (cond) 24; beards = 8; 25; else 26; beards = 4; 27; 28; volatile bool face = cond; 29; 30; return face ? beards : 0; 31; } 32 33; CHECK-LABEL: entry 34; CHECK: %foo = alloca i32, align 4 35; CHECK: %face = alloca i8, align 1 36; CHECK: %foo.0..sroa_cast = bitcast i32* %foo to i8* 37; CHECK: store volatile i32 0, i32* %foo, align 4 38; CHECK: %foo.0. = load volatile i32, i32* %foo, align 4, !dbg !16 39; CHECK: %cmp = icmp eq i32 %foo.0., 4, !dbg !16 40; CHECK: %frombool = zext i1 %cmp to i8, !dbg !16 41; CHECK: call void @llvm.dbg.value(metadata i8 %frombool, metadata !13, metadata !DIExpression()), !dbg !16 42; CHECK: call void @llvm.dbg.value(metadata i32 0, metadata !15, metadata !DIExpression()), !dbg !17 43; CHECK: %. = select i1 %cmp, i32 8, i32 4, !dbg ![[MERGEDLOC:[0-9]+]] 44; CHECK: ![[MERGEDLOC]] = !DILocation(line: 0, scope: !7) 45 46; ModuleID = 'pr39187.cpp' 47source_filename = "pr39187.cpp" 48target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128" 49target triple = "x86_64-pc-linux-gnu" 50 51; Function Attrs: norecurse nounwind uwtable 52define dso_local i32 @main() local_unnamed_addr #0 !dbg !7 { 53entry: 54 %foo = alloca i32, align 4 55 %face = alloca i8, align 1 56 %foo.0..sroa_cast = bitcast i32* %foo to i8* 57 store volatile i32 0, i32* %foo, align 4 58 %foo.0. = load volatile i32, i32* %foo, align 4, !dbg !26 59 %cmp = icmp eq i32 %foo.0., 4, !dbg !26 60 %frombool = zext i1 %cmp to i8, !dbg !26 61 call void @llvm.dbg.value(metadata i8 %frombool, metadata !15, metadata !DIExpression()), !dbg !26 62 call void @llvm.dbg.value(metadata i32 0, metadata !17, metadata !DIExpression()), !dbg !27 63 br i1 %cmp, label %if.then, label %if.else 64 65if.then: ; preds = %entry 66 call void @llvm.dbg.value(metadata i32 8, metadata !14, metadata !DIExpression()), !dbg !25 67 br label %if.end, !dbg !25 68 69if.else: ; preds = %entry 70 call void @llvm.dbg.value(metadata i32 4, metadata !14, metadata !DIExpression()), !dbg !27 71 br label %if.end, !dbg !27 72 73if.end: ; preds = %if.else, %if.then 74 %beards.0 = phi i32 [ 8, %if.then ], [ 4, %if.else ] 75 store volatile i8 %frombool, i8* %face, align 1 76 %face.0. = load volatile i8, i8* %face, align 1 77 %0 = and i8 %face.0., 1 78 %tobool3 = icmp eq i8 %0, 0 79 %cond4 = select i1 %tobool3, i32 0, i32 %beards.0 80 ret i32 %cond4 81} 82 83; Function Attrs: nounwind readnone speculatable 84declare void @llvm.dbg.value(metadata, metadata, metadata) #2 85 86!llvm.dbg.cu = !{!0} 87!llvm.module.flags = !{!3, !4, !5} 88!llvm.ident = !{!6} 89 90!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 8.0.0 (trunk 346301)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, nameTableKind: None) 91!1 = !DIFile(filename: "pr39187.cpp", directory: ".") 92!2 = !{} 93!3 = !{i32 2, !"Dwarf Version", i32 4} 94!4 = !{i32 2, !"Debug Info Version", i32 3} 95!5 = !{i32 1, !"wchar_size", i32 4} 96!6 = !{!"clang version 8.0.0 (trunk 346301)"} 97!7 = distinct !DISubprogram(name: "main", scope: !1, file: !1, line: 1, type: !8, isLocal: false, isDefinition: true, scopeLine: 1, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !11) 98!8 = !DISubroutineType(types: !9) 99!9 = !{!10} 100!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed) 101!11 = !{!14, !15, !17} 102!14 = !DILocalVariable(name: "beards", scope: !7, file: !1, line: 4, type: !10) 103!15 = !DILocalVariable(name: "cond", scope: !7, file: !1, line: 5, type: !16) 104!16 = !DIBasicType(name: "bool", size: 8, encoding: DW_ATE_boolean) 105!17 = !DILocalVariable(name: "bar", scope: !7, file: !1, line: 6, type: !10) 106!25 = !DILocation(line: 4, scope: !7) 107!26 = !DILocation(line: 5, scope: !7) 108!27 = !DILocation(line: 6, scope: !7) 109