1; RUN: opt < %s -passes=instcombine -S | FileCheck %s 2; RUN: opt < %s -passes=instcombine -S --try-experimental-debuginfo-iterators | FileCheck %s 3 4; When removing the llvm.dbg.value intrinsic in the unreachable block 5; InstCombine would incorrectly return a false Modified status. 6 7; CHECK: cond.true: 8; CHECK-NEXT: br label %cond.end 9 10define i32 @foo() !dbg !7 { 11entry: 12 br i1 false, label %cond.true, label %cond.end 13 14cond.true: 15 call void @llvm.dbg.value(metadata i32 undef, metadata !12, metadata !DIExpression()), !dbg !13 16 br label %cond.end 17 18cond.end: 19 ret i32 undef 20} 21 22declare void @llvm.dbg.value(metadata, metadata, metadata) #0 23 24attributes #0 = { nounwind readnone speculatable willreturn } 25 26!llvm.dbg.cu = !{!0} 27!llvm.module.flags = !{!3, !4} 28!llvm.ident = !{!6} 29 30!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 12.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, splitDebugInlining: false, nameTableKind: None) 31!1 = !DIFile(filename: "foo.c", directory: "/") 32!2 = !{} 33!3 = !{i32 7, !"Dwarf Version", i32 4} 34!4 = !{i32 2, !"Debug Info Version", i32 3} 35!6 = !{!"clang version 12.0.0"} 36!7 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 1, type: !8, scopeLine: 1, flags: DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !11) 37!8 = !DISubroutineType(types: !9) 38!9 = !{!10} 39!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed) 40!11 = !{!12, !12} 41!12 = !DILocalVariable(name: "bar", scope: !7, file: !1, line: 1, type: !10) 42!13 = !DILocation(line: 0, scope: !7) 43