1; RUN: opt < %s -S -passes=simplifycfg -simplifycfg-require-and-preserve-domtree=1 -hoist-common-insts=true | FileCheck %s 2; RUN: opt --try-experimental-debuginfo-iterators < %s -S -passes=simplifycfg -simplifycfg-require-and-preserve-domtree=1 -hoist-common-insts=true | FileCheck %s 3 4; SimplifyCFG can hoist any common code in the 'then' and 'else' blocks to 5; the 'if' basic block. 6; 7; For the special case, when hoisting the terminator instruction, its debug 8; location keep references to its basic block, causing the debug information 9; to become ambiguous. It causes the debugger to display unreached lines. 10 11; Check that hoisted instructions get unknown-location line numbers -- there 12; is no correct line number for code that has been common'd in this way. 13 14; IR generated with: 15; clang -S -g -gno-column-info -O2 -emit-llvm pr39187.cpp -o pr39187-g.ll -mllvm -opt-bisect-limit=10 16 17; // pr39187.cpp 18; int main() { 19; volatile int foo = 0; 20; 21; int beards = 0; 22; bool cond = foo == 4; 23; int bar = 0; 24; if (cond) 25; beards = 8; 26; else 27; beards = 4; 28; 29; volatile bool face = cond; 30; 31; return face ? beards : 0; 32; } 33 34; CHECK-LABEL: entry 35; CHECK: %foo = alloca i32, align 4 36; CHECK: %face = alloca i8, align 1 37; CHECK: store volatile i32 0, ptr %foo, align 4 38; CHECK: %foo.0. = load volatile i32, ptr %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: #dbg_value(i8 %frombool, !13, !DIExpression(), !16 42; CHECK: #dbg_value(i32 0, !15, !DIExpression(), !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 store volatile i32 0, ptr %foo, align 4 57 %foo.0. = load volatile i32, ptr %foo, align 4, !dbg !26 58 %cmp = icmp eq i32 %foo.0., 4, !dbg !26 59 %frombool = zext i1 %cmp to i8, !dbg !26 60 call void @llvm.dbg.value(metadata i8 %frombool, metadata !15, metadata !DIExpression()), !dbg !26 61 call void @llvm.dbg.value(metadata i32 0, metadata !17, metadata !DIExpression()), !dbg !27 62 br i1 %cmp, label %if.then, label %if.else 63 64if.then: ; preds = %entry 65 call void @llvm.dbg.value(metadata i32 8, metadata !14, metadata !DIExpression()), !dbg !25 66 br label %if.end, !dbg !25 67 68if.else: ; preds = %entry 69 call void @llvm.dbg.value(metadata i32 4, metadata !14, metadata !DIExpression()), !dbg !27 70 br label %if.end, !dbg !27 71 72if.end: ; preds = %if.else, %if.then 73 %beards.0 = phi i32 [ 8, %if.then ], [ 4, %if.else ] 74 store volatile i8 %frombool, ptr %face, align 1 75 %face.0. = load volatile i8, ptr %face, align 1 76 %0 = and i8 %face.0., 1 77 %tobool3 = icmp eq i8 %0, 0 78 %cond4 = select i1 %tobool3, i32 0, i32 %beards.0 79 ret i32 %cond4 80} 81 82; Function Attrs: nounwind readnone speculatable 83declare void @llvm.dbg.value(metadata, metadata, metadata) #2 84 85!llvm.dbg.cu = !{!0} 86!llvm.module.flags = !{!3, !4, !5} 87!llvm.ident = !{!6} 88 89!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) 90!1 = !DIFile(filename: "pr39187.cpp", directory: ".") 91!2 = !{} 92!3 = !{i32 2, !"Dwarf Version", i32 4} 93!4 = !{i32 2, !"Debug Info Version", i32 3} 94!5 = !{i32 1, !"wchar_size", i32 4} 95!6 = !{!"clang version 8.0.0 (trunk 346301)"} 96!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) 97!8 = !DISubroutineType(types: !9) 98!9 = !{!10} 99!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed) 100!11 = !{!14, !15, !17} 101!14 = !DILocalVariable(name: "beards", scope: !7, file: !1, line: 4, type: !10) 102!15 = !DILocalVariable(name: "cond", scope: !7, file: !1, line: 5, type: !16) 103!16 = !DIBasicType(name: "bool", size: 8, encoding: DW_ATE_boolean) 104!17 = !DILocalVariable(name: "bar", scope: !7, file: !1, line: 6, type: !10) 105!25 = !DILocation(line: 4, scope: !7) 106!26 = !DILocation(line: 5, scope: !7) 107!27 = !DILocation(line: 6, scope: !7) 108