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1; RUN: llc %s -stop-after=finalize-isel -o - \2; RUN: | FileCheck %s --implicit-check-not=DBG_VALUE3 4;; Check that sandwiching instructions between a linked store and dbg.assign5;; results in a dbg.value(prev_value) being inserted at the store, and a6;; dbg.value(deref) at the dbg.assign.7;; Same as use-known-value-at-early-mem-def.ll except the "early mem def" is8;; for a fragment of the variable rather than the whole.9 10; CHECK: bb.0.entry:11; CHECK-NEXT: DBG_VALUE %stack.0.c, $noreg, ![[var:[0-9]+]], !DIExpression(DW_OP_deref), debug-location12; CHECK: MOV64mi32 %stack.0.c, 1, $noreg, 0, $noreg, 513;; No DBG_VALUE required because the stack location is still valid.14 15; CHECK: MOV32mi %stack.0.c, 1, $noreg, 0, $noreg, 116; CHECK-NEXT: DBG_VALUE $noreg, $noreg, ![[var]], !DIExpression(DW_OP_LLVM_fragment, 0, 32), debug-location17;; This DBG_VALUE is added by the frag-agg pass because bits [32, 64) are still18;; live in memory.19; CHECK-NEXT: DBG_VALUE %stack.0.c, $noreg, ![[var]], !DIExpression(DW_OP_plus_uconst, 4, DW_OP_deref, DW_OP_LLVM_fragment, 32, 32)20 21;; After the call to @d there's a dbg.assign linked to the store to bits 0-3222;; that comes before it. Meaning the stack location for bits 0-32 are valid23;; from here (bits 32-64 for the variable are already located in memory).24; CHECK: CALL64pcrel32 @d25; CHECK-NEXT: ADJCALLSTACKUP6426; CHECK-NEXT: DBG_VALUE %stack.0.c, $noreg, ![[var]], !DIExpression(DW_OP_deref), debug-location27 28target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"29target triple = "x86_64-unknown-linux-gnu"30 31; Function Attrs: nounwind uwtable32define dso_local void @b() local_unnamed_addr #0 !dbg !7 {33entry:34 %c = alloca i64, align 1, !DIAssignID !1335 call void @llvm.dbg.assign(metadata i1 undef, metadata !11, metadata !DIExpression(), metadata !13, metadata ptr %c, metadata !DIExpression()), !dbg !1436 call void @llvm.lifetime.start.p0(i64 1, ptr nonnull %c) #4, !dbg !1537 store i64 5, ptr %c, align 1, !dbg !16, !DIAssignID !2038 call void @llvm.dbg.assign(metadata i64 5, metadata !11, metadata !DIExpression(), metadata !20, metadata ptr %c, metadata !DIExpression()), !dbg !1439 tail call void (...) @d() #4, !dbg !2140 41 ; --- VV Hand written VV --- ;42 store i32 1, ptr %c, align 1, !dbg !16, !DIAssignID !3143 ;; Check that a dbg.value(undef, frag(0, 32)) is inserted here. The value of44 ;; the fragment is "unknown". TODO: In this case the value of the fragment is45 ;; still obviously 5; a future improvement could be to be smarter and work46 ;; this out. But that's a lot of work for an uncommon case.47 tail call void (...) @d() #4, !dbg !2148 call void @llvm.dbg.assign(metadata i32 1, metadata !11, metadata !DIExpression(DW_OP_LLVM_fragment, 0, 32), metadata !31, metadata ptr %c, metadata !DIExpression()), !dbg !1449 ; --- AA Hand written AA --- ;50 51 call void @a(ptr nonnull %c) #4, !dbg !2252 call void @llvm.lifetime.end.p0(i64 1, ptr nonnull %c) #4, !dbg !2353 ret void, !dbg !2354}55 56declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #157declare !dbg !24 dso_local void @d(...) local_unnamed_addr #258declare !dbg !27 dso_local void @a(ptr) local_unnamed_addr #259declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #160declare void @llvm.dbg.assign(metadata, metadata, metadata, metadata, metadata, metadata) #361 62!llvm.dbg.cu = !{!0}63!llvm.module.flags = !{!3, !4, !5, !1000}64!llvm.ident = !{!6}65 66!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)67!1 = !DIFile(filename: "reduce.c", directory: "/")68!2 = !{}69!3 = !{i32 7, !"Dwarf Version", i32 4}70!4 = !{i32 2, !"Debug Info Version", i32 3}71!5 = !{i32 1, !"wchar_size", i32 4}72!6 = !{!"clang version 12.0.0"}73!7 = distinct !DISubprogram(name: "b", scope: !1, file: !1, line: 3, type: !8, scopeLine: 3, flags: DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !10)74!8 = !DISubroutineType(types: !9)75!9 = !{null}76!10 = !{!11}77!11 = !DILocalVariable(name: "c", scope: !7, file: !1, line: 4, type: !12)78!12 = !DIBasicType(name: "char", size: 64, encoding: DW_ATE_unsigned)79!13 = distinct !DIAssignID()80!14 = !DILocation(line: 0, scope: !7)81!15 = !DILocation(line: 4, column: 3, scope: !7)82!16 = !DILocation(line: 4, column: 8, scope: !7)83!20 = distinct !DIAssignID()84!21 = !DILocation(line: 5, column: 3, scope: !7)85!22 = !DILocation(line: 6, column: 3, scope: !7)86!23 = !DILocation(line: 7, column: 1, scope: !7)87!24 = !DISubprogram(name: "d", scope: !1, file: !1, line: 2, type: !25, spFlags: DISPFlagOptimized, retainedNodes: !2)88!25 = !DISubroutineType(types: !26)89!26 = !{null, null}90!27 = !DISubprogram(name: "a", scope: !1, file: !1, line: 1, type: !28, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized, retainedNodes: !2)91!28 = !DISubroutineType(types: !29)92!29 = !{null, !30}93!30 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !12, size: 64)94!31 = distinct !DIAssignID()95!1000 = !{i32 7, !"debug-info-assignment-tracking", i1 true}96