; RUN: opt < %s -S -simplifycfg -simplifycfg-require-and-preserve-domtree=1 -hoist-common-insts=true | FileCheck %s ; SimplifyCFG can hoist any common code in the 'then' and 'else' blocks to ; the 'if' basic block. ; ; For the special case, when hoisting the terminator instruction, its debug ; location keep references to its basic block, causing the debug information ; to become ambiguous. It causes the debugger to display unreached lines. ; Check that hoisted instructions get unknown-location line numbers -- there ; is no correct line number for code that has been common'd in this way. ; IR generated with: ; clang -S -g -gno-column-info -O2 -emit-llvm pr39187.cpp -o pr39187-g.ll -mllvm -opt-bisect-limit=10 ; // pr39187.cpp ; int main() { ; volatile int foo = 0; ; ; int beards = 0; ; bool cond = foo == 4; ; int bar = 0; ; if (cond) ; beards = 8; ; else ; beards = 4; ; ; volatile bool face = cond; ; ; return face ? beards : 0; ; } ; CHECK-LABEL: entry ; CHECK: %foo = alloca i32, align 4 ; CHECK: %face = alloca i8, align 1 ; CHECK: %foo.0..sroa_cast = bitcast i32* %foo to i8* ; CHECK: store volatile i32 0, i32* %foo, align 4 ; CHECK: %foo.0. = load volatile i32, i32* %foo, align 4, !dbg !16 ; CHECK: %cmp = icmp eq i32 %foo.0., 4, !dbg !16 ; CHECK: %frombool = zext i1 %cmp to i8, !dbg !16 ; CHECK: call void @llvm.dbg.value(metadata i8 %frombool, metadata !13, metadata !DIExpression()), !dbg !16 ; CHECK: call void @llvm.dbg.value(metadata i32 0, metadata !15, metadata !DIExpression()), !dbg !17 ; CHECK: %. = select i1 %cmp, i32 8, i32 4, !dbg ![[MERGEDLOC:[0-9]+]] ; CHECK: ![[MERGEDLOC]] = !DILocation(line: 0, scope: !7) ; ModuleID = 'pr39187.cpp' source_filename = "pr39187.cpp" target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128" target triple = "x86_64-pc-linux-gnu" ; Function Attrs: norecurse nounwind uwtable define dso_local i32 @main() local_unnamed_addr #0 !dbg !7 { entry: %foo = alloca i32, align 4 %face = alloca i8, align 1 %foo.0..sroa_cast = bitcast i32* %foo to i8* store volatile i32 0, i32* %foo, align 4 %foo.0. = load volatile i32, i32* %foo, align 4, !dbg !26 %cmp = icmp eq i32 %foo.0., 4, !dbg !26 %frombool = zext i1 %cmp to i8, !dbg !26 call void @llvm.dbg.value(metadata i8 %frombool, metadata !15, metadata !DIExpression()), !dbg !26 call void @llvm.dbg.value(metadata i32 0, metadata !17, metadata !DIExpression()), !dbg !27 br i1 %cmp, label %if.then, label %if.else if.then: ; preds = %entry call void @llvm.dbg.value(metadata i32 8, metadata !14, metadata !DIExpression()), !dbg !25 br label %if.end, !dbg !25 if.else: ; preds = %entry call void @llvm.dbg.value(metadata i32 4, metadata !14, metadata !DIExpression()), !dbg !27 br label %if.end, !dbg !27 if.end: ; preds = %if.else, %if.then %beards.0 = phi i32 [ 8, %if.then ], [ 4, %if.else ] store volatile i8 %frombool, i8* %face, align 1 %face.0. = load volatile i8, i8* %face, align 1 %0 = and i8 %face.0., 1 %tobool3 = icmp eq i8 %0, 0 %cond4 = select i1 %tobool3, i32 0, i32 %beards.0 ret i32 %cond4 } ; Function Attrs: nounwind readnone speculatable declare void @llvm.dbg.value(metadata, metadata, metadata) #2 !llvm.dbg.cu = !{!0} !llvm.module.flags = !{!3, !4, !5} !llvm.ident = !{!6} !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) !1 = !DIFile(filename: "pr39187.cpp", directory: ".") !2 = !{} !3 = !{i32 2, !"Dwarf Version", i32 4} !4 = !{i32 2, !"Debug Info Version", i32 3} !5 = !{i32 1, !"wchar_size", i32 4} !6 = !{!"clang version 8.0.0 (trunk 346301)"} !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) !8 = !DISubroutineType(types: !9) !9 = !{!10} !10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed) !11 = !{!14, !15, !17} !14 = !DILocalVariable(name: "beards", scope: !7, file: !1, line: 4, type: !10) !15 = !DILocalVariable(name: "cond", scope: !7, file: !1, line: 5, type: !16) !16 = !DIBasicType(name: "bool", size: 8, encoding: DW_ATE_boolean) !17 = !DILocalVariable(name: "bar", scope: !7, file: !1, line: 6, type: !10) !25 = !DILocation(line: 4, scope: !7) !26 = !DILocation(line: 5, scope: !7) !27 = !DILocation(line: 6, scope: !7)