; RUN: opt %s -S -passes=instcombine -o - \ ; RUN: | FileCheck %s ; RUN: opt --try-experimental-debuginfo-iterators %s -S -passes=instcombine -o - \ ; RUN: | FileCheck %s ;; Check that when instcombine sinks an instruction used by a dbg.assign, the ;; usual debug intrinsic updating doesn't take place (i.e. do not ;; clone-and-sink a dbg.assign). Assignment tracking should be able to handle ;; this gracefully for variables that still have a stack home. For fully ;; promoted variables we may need to revisit this. ;; $ cat test.c ;; struct a { ;; char *b; ;; } c() __attribute__((noreturn)); ;; int d; ;; int e(); ;; int f() { ;; if (e()) ;; return d; ;; c(); ;; } ;; void g(); ;; void h() { ;; struct a i; ;; i.b = 0; ;; f(); ;; i.b = 0; ;; g(&i); ;; } ;; $ clang -O2 -g -Xclang -fexperimental-assignment-tracking ; CHECK: f.exit: ; CHECK-NEXT: store ptr null, ptr %i, align 8,{{.+}}, !DIAssignID ![[ID:[0-9]+]] ; CHECK-NEXT: call void @llvm.dbg.assign({{.+}}, {{.+}}, {{.+}}, metadata ![[ID]], metadata ptr %i, {{.+}}), !dbg %struct.a = type { ptr } @d = dso_local local_unnamed_addr global i32 0, align 4, !dbg !0 ; Function Attrs: nounwind uwtable define dso_local i32 @f() local_unnamed_addr #0 !dbg !11 { entry: %call = tail call i32 (...) @e() #5, !dbg !14 %tobool.not = icmp eq i32 %call, 0, !dbg !14 br i1 %tobool.not, label %if.end, label %if.then, !dbg !16 if.then: ; preds = %entry %0 = load i32, ptr @d, align 4, !dbg !17 ret i32 %0, !dbg !22 if.end: ; preds = %entry %call1 = tail call ptr (...) @c() #6, !dbg !23 unreachable, !dbg !23 } declare !dbg !24 dso_local i32 @e(...) local_unnamed_addr #1 ; Function Attrs: noreturn declare !dbg !27 dso_local ptr @c(...) local_unnamed_addr #2 ; Function Attrs: nounwind uwtable define dso_local void @h() local_unnamed_addr #0 !dbg !35 { entry: %i = alloca %struct.a, align 8, !DIAssignID !40 call void @llvm.dbg.assign(metadata i1 undef, metadata !39, metadata !DIExpression(), metadata !40, metadata ptr %i, metadata !DIExpression()), !dbg !41 %0 = bitcast ptr %i to ptr, !dbg !42 call void @llvm.lifetime.start.p0i8(i64 8, ptr nonnull %0) #5, !dbg !42 %b = getelementptr inbounds %struct.a, ptr %i, i64 0, i32 0, !dbg !43 call void @llvm.dbg.assign(metadata ptr null, metadata !39, metadata !DIExpression(), metadata !44, metadata ptr %b, metadata !DIExpression()), !dbg !41 %call.i = tail call i32 (...) @e() #5, !dbg !45 %tobool.not.i = icmp eq i32 %call.i, 0, !dbg !45 br i1 %tobool.not.i, label %if.end.i, label %f.exit, !dbg !47 if.end.i: ; preds = %entry %call1.i = tail call ptr (...) @c() #6, !dbg !48 unreachable, !dbg !48 f.exit: ; preds = %entry store ptr null, ptr %b, align 8, !dbg !49, !DIAssignID !53 call void @llvm.dbg.assign(metadata ptr null, metadata !39, metadata !DIExpression(), metadata !53, metadata ptr %b, metadata !DIExpression()), !dbg !41 call void @g(ptr nonnull %i) #5, !dbg !54 call void @llvm.lifetime.end.p0i8(i64 8, ptr nonnull %0) #5, !dbg !55 ret void, !dbg !55 } declare void @llvm.lifetime.start.p0i8(i64 immarg, ptr nocapture) #3 declare dso_local void @g(...) local_unnamed_addr #1 declare void @llvm.lifetime.end.p0i8(i64 immarg, ptr nocapture) #3 declare void @llvm.dbg.assign(metadata, metadata, metadata, metadata, metadata, metadata) #4 !llvm.dbg.cu = !{!2} !llvm.module.flags = !{!7, !8, !9, !1000} !llvm.ident = !{!10} !0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression()) !1 = distinct !DIGlobalVariable(name: "d", scope: !2, file: !3, line: 4, type: !6, isLocal: false, isDefinition: true) !2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 12.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, splitDebugInlining: false, nameTableKind: None) !3 = !DIFile(filename: "test.c", directory: "/") !4 = !{} !5 = !{!0} !6 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed) !7 = !{i32 7, !"Dwarf Version", i32 4} !8 = !{i32 2, !"Debug Info Version", i32 3} !9 = !{i32 1, !"wchar_size", i32 4} !10 = !{!"clang version 12.0.0"} !11 = distinct !DISubprogram(name: "f", scope: !3, file: !3, line: 6, type: !12, scopeLine: 6, flags: DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !4) !12 = !DISubroutineType(types: !13) !13 = !{!6} !14 = !DILocation(line: 7, column: 7, scope: !15) !15 = distinct !DILexicalBlock(scope: !11, file: !3, line: 7, column: 7) !16 = !DILocation(line: 7, column: 7, scope: !11) !17 = !DILocation(line: 8, column: 12, scope: !15) !22 = !DILocation(line: 8, column: 5, scope: !15) !23 = !DILocation(line: 9, column: 3, scope: !11) !24 = !DISubprogram(name: "e", scope: !3, file: !3, line: 5, type: !25, spFlags: DISPFlagOptimized, retainedNodes: !4) !25 = !DISubroutineType(types: !26) !26 = !{!6, null} !27 = !DISubprogram(name: "c", scope: !3, file: !3, line: 3, type: !28, flags: DIFlagNoReturn, spFlags: DISPFlagOptimized, retainedNodes: !4) !28 = !DISubroutineType(types: !29) !29 = !{!30, null} !30 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "a", file: !3, line: 1, size: 64, elements: !31) !31 = !{!32} !32 = !DIDerivedType(tag: DW_TAG_member, name: "b", scope: !30, file: !3, line: 2, baseType: !33, size: 64) !33 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !34, size: 64) !34 = !DIBasicType(name: "char", size: 8, encoding: DW_ATE_signed_char) !35 = distinct !DISubprogram(name: "h", scope: !3, file: !3, line: 12, type: !36, scopeLine: 12, flags: DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !38) !36 = !DISubroutineType(types: !37) !37 = !{null} !38 = !{!39} !39 = !DILocalVariable(name: "i", scope: !35, file: !3, line: 13, type: !30) !40 = distinct !DIAssignID() !41 = !DILocation(line: 0, scope: !35) !42 = !DILocation(line: 13, column: 3, scope: !35) !43 = !DILocation(line: 14, column: 5, scope: !35) !44 = distinct !DIAssignID() !45 = !DILocation(line: 7, column: 7, scope: !15, inlinedAt: !46) !46 = distinct !DILocation(line: 15, column: 3, scope: !35) !47 = !DILocation(line: 7, column: 7, scope: !11, inlinedAt: !46) !48 = !DILocation(line: 9, column: 3, scope: !11, inlinedAt: !46) !49 = !DILocation(line: 16, column: 7, scope: !35) !53 = distinct !DIAssignID() !54 = !DILocation(line: 17, column: 3, scope: !35) !55 = !DILocation(line: 18, column: 1, scope: !35) !1000 = !{i32 7, !"debug-info-assignment-tracking", i1 true}