| ; RUN: opt -mtriple=x86_64-- -S -passes=dse %s -o - | FileCheck %s |
| ; Ensure that we can mark a value as undefined when performing dead |
| ; store elimination. |
| ; Bugzilla #45080 |
| |
| @b = common dso_local local_unnamed_addr global i32 0, align 1 |
| |
| define dso_local i32 @main() local_unnamed_addr !dbg !7 { |
| %1 = alloca i32, align 4 |
| %2 = load i32, ptr @b, align 1, !dbg !13 |
| ; CHECK: call void @llvm.dbg.value(metadata i32 poison |
| call void @llvm.dbg.value(metadata i32 %2, metadata !12, metadata !DIExpression()), !dbg !13 |
| store i32 %2, ptr %1, align 4, !dbg !13 |
| ret i32 0, !dbg !13 |
| } |
| |
| declare void @llvm.dbg.value(metadata, metadata, metadata) |
| |
| !llvm.dbg.cu = !{!0} |
| !llvm.module.flags = !{!3, !4} |
| !llvm.ident = !{!6} |
| |
| !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) |
| !1 = !DIFile(filename: "dead-store-elimination-marks-undef.ll", directory: "/temp/bz45080") |
| !2 = !{} |
| !3 = !{i32 2, !"Dwarf Version", i32 4} |
| !4 = !{i32 2, !"Debug Info Version", i32 3} |
| !6 = !{!"clang version 10.0.0"} |
| !7 = distinct !DISubprogram(name: "main", scope: !1, file: !1, line: 3, type: !8, scopeLine: 3, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !11) |
| !8 = !DISubroutineType(types: !9) |
| !9 = !{!10} |
| !10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed) |
| !11 = !{!12} |
| !12 = !DILocalVariable(name: "l_2864", scope: !7, file: !1, line: 4, type: !10) |
| !13 = !DILocation(line: 5, column: 12, scope: !7) |
| |