; RUN: opt < %s -reassociate -S | FileCheck %s ; Check that reassociate pass now undefs debug intrinsics that reference a value ; that gets dropped and cannot be salvaged. define hidden i32 @main() local_unnamed_addr { entry: %foo = alloca i32, align 4, !dbg !20 %foo.0.foo.0..sroa_cast = bitcast i32* %foo to i8*, !dbg !20 call void @llvm.lifetime.start.p0i8(i64 4, i8* nonnull %foo.0.foo.0..sroa_cast), !dbg !20 store volatile i32 4, i32* %foo, align 4, !dbg !20, !tbaa !21 %foo.0.foo.0. = load volatile i32, i32* %foo, align 4, !dbg !25, !tbaa !21 %foo.0.foo.0.15 = load volatile i32, i32* %foo, align 4, !dbg !27, !tbaa !21 %foo.0.foo.0.16 = load volatile i32, i32* %foo, align 4, !dbg !28, !tbaa !21 ; CHECK-NOT: %add = add nsw i32 %foo.0.foo.0., %foo.0.foo.0.15 %add = add nsw i32 %foo.0.foo.0., %foo.0.foo.0.15, !dbg !29 ; CHECK: call void @llvm.dbg.value(metadata i32 undef, metadata [[VAR_A:![0-9]+]], metadata !DIExpression()) call void @llvm.dbg.value(metadata i32 %add, metadata !19, metadata !DIExpression()), !dbg !26 %foo.0.foo.0.17 = load volatile i32, i32* %foo, align 4, !dbg !30, !tbaa !21 %cmp = icmp eq i32 %foo.0.foo.0.17, 4, !dbg !30 br i1 %cmp, label %if.then, label %if.end, !dbg !32 ; CHECK-LABEL: if.then: if.then: ; CHECK-NOT: %add1 = add nsw i32 %add, %foo.0.foo.0.16 %add1 = add nsw i32 %add, %foo.0.foo.0.16, !dbg !33 ; CHECK: call void @llvm.dbg.value(metadata i32 undef, metadata [[VAR_A]], metadata !DIExpression()) call void @llvm.dbg.value(metadata i32 %add1, metadata !19, metadata !DIExpression()), !dbg !26 ; CHECK: call void @llvm.dbg.value(metadata i32 undef, metadata [[VAR_CHEESE:![0-9]+]], metadata !DIExpression()) call void @llvm.dbg.value(metadata i32 %add, metadata !18, metadata !DIExpression()), !dbg !26 %sub = add nsw i32 %add, -12, !dbg !34 %sub3 = sub nsw i32 %add1, %sub, !dbg !34 %mul = mul nsw i32 %sub3, 20, !dbg !36 %div = sdiv i32 %mul, 3, !dbg !37 br label %if.end, !dbg !38 if.end: %a.0 = phi i32 [ %div, %if.then ], [ 0, %entry ], !dbg !39 call void @llvm.lifetime.end.p0i8(i64 4, i8* nonnull %foo.0.foo.0..sroa_cast), !dbg !40 ret i32 %a.0, !dbg !41 } declare void @llvm.lifetime.start.p0i8(i64 immarg, i8* nocapture) #1 declare void @llvm.dbg.declare(metadata, metadata, metadata) #2 declare void @llvm.lifetime.end.p0i8(i64 immarg, i8* nocapture) #1 declare void @llvm.dbg.value(metadata, metadata, metadata) #2 !llvm.dbg.cu = !{!0} !llvm.module.flags = !{!3, !4, !5, !6} !llvm.ident = !{!7} !0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus_14, file: !1, producer: "clang version 10.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, debugInfoForProfiling: true, nameTableKind: None) !1 = !DIFile(filename: "test.cpp", directory: "F:\") !2 = !{} !3 = !{i32 2, !"Dwarf Version", i32 4} !4 = !{i32 2, !"Debug Info Version", i32 3} !5 = !{i32 1, !"wchar_size", i32 2} !6 = !{i32 7, !"PIC Level", i32 2} !7 = !{!"clang version 10.0.0"} !8 = distinct !DISubprogram(name: "main", scope: !9, file: !9, line: 1, type: !10, scopeLine: 1, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !13) !9 = !DIFile(filename: "./test.cpp", directory: "F:\") !10 = !DISubroutineType(types: !11) !11 = !{!12} !12 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed) !13 = !{!14, !16, !17, !18, !19} !14 = !DILocalVariable(name: "foo", scope: !8, file: !9, line: 2, type: !15) !15 = !DIDerivedType(tag: DW_TAG_volatile_type, baseType: !12) !16 = !DILocalVariable(name: "read1", scope: !8, file: !9, line: 3, type: !12) !17 = !DILocalVariable(name: "read2", scope: !8, file: !9, line: 4, type: !12) ; CHECK: [[VAR_CHEESE]] = !DILocalVariable(name: "cheese" !18 = !DILocalVariable(name: "cheese", scope: !8, file: !9, line: 6, type: !12) ; CHECK: [[VAR_A]] = !DILocalVariable(name: "a" !19 = !DILocalVariable(name: "a", scope: !8, file: !9, line: 7, type: !12) !20 = !DILocation(line: 2, scope: !8) !21 = !{!22, !22, i64 0} !22 = !{!"int", !23, i64 0} !23 = !{!"omnipotent char", !24, i64 0} !24 = !{!"Simple C++ TBAA"} !25 = !DILocation(line: 3, scope: !8) !26 = !DILocation(line: 0, scope: !8) !27 = !DILocation(line: 4, scope: !8) !28 = !DILocation(line: 6, scope: !8) !29 = !DILocation(line: 7, scope: !8) !30 = !DILocation(line: 10, scope: !31) !31 = distinct !DILexicalBlock(scope: !8, file: !9, line: 10) !32 = !DILocation(line: 10, scope: !8) !33 = !DILocation(line: 8, scope: !8) !34 = !DILocation(line: 12, scope: !35) !35 = distinct !DILexicalBlock(scope: !31, file: !9, line: 10) !36 = !DILocation(line: 13, scope: !35) !37 = !DILocation(line: 14, scope: !35) !38 = !DILocation(line: 15, scope: !35) !39 = !DILocation(line: 0, scope: !31) !40 = !DILocation(line: 20, scope: !8) !41 = !DILocation(line: 19, scope: !8)