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1; Check for setting dbg.value as undef which depends on trivially dead instructions.2; RUN: opt -passes=instcombine -S -o - %s | FileCheck %s3 4@a = common dso_local global i8 0, align 1, !dbg !05@b = common dso_local global i8 0, align 1, !dbg !66 7define dso_local i32 @main() !dbg !13 {8entry:9 %0 = load i8, ptr @a, align 1, !dbg !1710 %dec = add i8 %0, -1, !dbg !1711 store i8 %dec, ptr @a, align 1, !dbg !1712;CHECK: #dbg_value(i32 poison13;CHECK: #dbg_value(i32 -814;CHECK: #dbg_value(i32 poison15 %conv = sext i8 %dec to i32, !dbg !1716 %udiv = udiv i32 %conv, 4, !dbg !1717 call void @llvm.dbg.value(metadata i32 %udiv, metadata !18, metadata !DIExpression()), !dbg !1918 call void @llvm.dbg.value(metadata i32 -8, metadata !20, metadata !DIExpression()), !dbg !1919 call void @llvm.dbg.value(metadata i32 %udiv, metadata !20, metadata !DIExpression()), !dbg !1920 store i8 0, ptr @b, align 1, !dbg !2121 %cmp = icmp sgt i32 %conv, 0, !dbg !2222 %conv1 = zext i1 %cmp to i32, !dbg !2223 ret i32 0, !dbg !2324}25 26declare void @llvm.dbg.value(metadata, metadata, metadata) 27 28!llvm.dbg.cu = !{!2}29!llvm.module.flags = !{!9, !10, !11}30!llvm.ident = !{!12}31 32!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())33!1 = distinct !DIGlobalVariable(name: "a", scope: !2, file: !3, line: 1, type: !8, isLocal: false, isDefinition: true)34!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 10.0.0", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, nameTableKind: None)35!3 = !DIFile(filename: "test", directory: "n")36!4 = !{}37!5 = !{!0, !6}38!6 = !DIGlobalVariableExpression(var: !7, expr: !DIExpression())39!7 = distinct !DIGlobalVariable(name: "b", scope: !2, file: !3, line: 1, type: !8, isLocal: false, isDefinition: true)40!8 = !DIBasicType(name: "char", size: 8, encoding: DW_ATE_signed_char)41!9 = !{i32 2, !"Dwarf Version", i32 4}42!10 = !{i32 2, !"Debug Info Version", i32 3}43!11 = !{i32 1, !"wchar_size", i32 4}44!12 = !{!"clang version 10.0.0"}45!13 = distinct !DISubprogram(name: "main", scope: !3, file: !3, line: 2, type: !14, scopeLine: 2, spFlags: DISPFlagDefinition, unit: !2, retainedNodes: !4)46!14 = !DISubroutineType(types: !15)47!15 = !{!16}48!16 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)49!17 = !DILocation(line: 4, column: 11, scope: !13)50!18 = !DILocalVariable(name: "c", scope: !13, file: !3, line: 4, type: !16)51!19 = !DILocation(line: 0, scope: !13)52!20 = !DILocalVariable(name: "l_1240", scope: !13, file: !3, line: 6, type: !16)53!21 = !DILocation(line: 10, column: 10, scope: !13)54!22 = !DILocation(line: 10, column: 5, scope: !13)55!23 = !DILocation(line: 12, column: 1, scope: !13)56