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1; RUN: opt -mtriple=x86_64-- -S -passes=dse %s -o - | FileCheck %s2; Ensure that we can mark a value as undefined when performing dead3; store elimination.4; Bugzilla #450805 6@b = common dso_local local_unnamed_addr global i32 0, align 17 8define dso_local i32 @main() local_unnamed_addr !dbg !7 {9 %1 = alloca i32, align 410 %2 = load i32, ptr @b, align 1, !dbg !1311 ; CHECK: #dbg_value(i32 poison12 call void @llvm.dbg.value(metadata i32 %2, metadata !12, metadata !DIExpression()), !dbg !1313 store i32 %2, ptr %1, align 4, !dbg !1314 ret i32 0, !dbg !1315}16 17declare void @llvm.dbg.value(metadata, metadata, metadata)18 19!llvm.dbg.cu = !{!0}20!llvm.module.flags = !{!3, !4}21!llvm.ident = !{!6}22 23!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 10.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, globals: !2, nameTableKind: None)24!1 = !DIFile(filename: "dead-store-elimination-marks-undef.ll", directory: "/temp/bz45080")25!2 = !{}26!3 = !{i32 2, !"Dwarf Version", i32 4}27!4 = !{i32 2, !"Debug Info Version", i32 3}28!6 = !{!"clang version 10.0.0"}29!7 = distinct !DISubprogram(name: "main", scope: !1, file: !1, line: 3, type: !8, scopeLine: 3, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !11)30!8 = !DISubroutineType(types: !9)31!9 = !{!10}32!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)33!11 = !{!12}34!12 = !DILocalVariable(name: "l_2864", scope: !7, file: !1, line: 4, type: !10)35!13 = !DILocation(line: 5, column: 12, scope: !7)36 37