1; RUN: llc %s -stop-after=finalize-isel -o - \ 2; RUN: | FileCheck %s --implicit-check-not=DBG_VALUE 3 4 5; RUN: llc --try-experimental-debuginfo-iterators %s -stop-after=finalize-isel -o - \ 6; RUN: | FileCheck %s --implicit-check-not=DBG_VALUE 7 8;; Check that sandwiching instructions between a linked store and dbg.assign 9;; results in a dbg.value(prev_value) being inserted at the store, and a 10;; dbg.value(deref) at the dbg.assign. 11;; Same as use-known-value-at-early-mem-def.ll except the "early mem def" is 12;; for a fragment of the variable rather than the whole. 13 14; CHECK: bb.0.entry: 15; CHECK-NEXT: DBG_VALUE %stack.0.c, $noreg, ![[var:[0-9]+]], !DIExpression(DW_OP_deref), debug-location 16; CHECK: MOV64mi32 %stack.0.c, 1, $noreg, 0, $noreg, 5 17;; No DBG_VALUE required because the stack location is still valid. 18 19; CHECK: MOV32mi %stack.0.c, 1, $noreg, 0, $noreg, 1 20; CHECK-NEXT: DBG_VALUE $noreg, $noreg, ![[var]], !DIExpression(DW_OP_LLVM_fragment, 0, 32), debug-location 21;; This DBG_VALUE is added by the frag-agg pass because bits [32, 64) are still 22;; live in memory. 23; CHECK-NEXT: DBG_VALUE %stack.0.c, $noreg, ![[var]], !DIExpression(DW_OP_plus_uconst, 4, DW_OP_deref, DW_OP_LLVM_fragment, 32, 32) 24 25;; After the call to @d there's a dbg.assign linked to the store to bits 0-32 26;; that comes before it. Meaning the stack location for bits 0-32 are valid 27;; from here (bits 32-64 for the variable are already located in memory). 28; CHECK: CALL64pcrel32 @d 29; CHECK-NEXT: ADJCALLSTACKUP64 30; CHECK-NEXT: DBG_VALUE %stack.0.c, $noreg, ![[var]], !DIExpression(DW_OP_deref), debug-location 31 32target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128" 33target triple = "x86_64-unknown-linux-gnu" 34 35; Function Attrs: nounwind uwtable 36define dso_local void @b() local_unnamed_addr #0 !dbg !7 { 37entry: 38 %c = alloca i64, align 1, !DIAssignID !13 39 call void @llvm.dbg.assign(metadata i1 undef, metadata !11, metadata !DIExpression(), metadata !13, metadata ptr %c, metadata !DIExpression()), !dbg !14 40 call void @llvm.lifetime.start.p0(i64 1, ptr nonnull %c) #4, !dbg !15 41 store i64 5, ptr %c, align 1, !dbg !16, !DIAssignID !20 42 call void @llvm.dbg.assign(metadata i64 5, metadata !11, metadata !DIExpression(), metadata !20, metadata ptr %c, metadata !DIExpression()), !dbg !14 43 tail call void (...) @d() #4, !dbg !21 44 45 ; --- VV Hand written VV --- ; 46 store i32 1, ptr %c, align 1, !dbg !16, !DIAssignID !31 47 ;; Check that a dbg.value(undef, frag(0, 32)) is inserted here. The value of 48 ;; the fragment is "unknown". TODO: In this case the value of the fragment is 49 ;; still obviously 5; a future improvement could be to be smarter and work 50 ;; this out. But that's a lot of work for an uncommon case. 51 tail call void (...) @d() #4, !dbg !21 52 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 !14 53 ; --- AA Hand written AA --- ; 54 55 call void @a(ptr nonnull %c) #4, !dbg !22 56 call void @llvm.lifetime.end.p0(i64 1, ptr nonnull %c) #4, !dbg !23 57 ret void, !dbg !23 58} 59 60declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1 61declare !dbg !24 dso_local void @d(...) local_unnamed_addr #2 62declare !dbg !27 dso_local void @a(ptr) local_unnamed_addr #2 63declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1 64declare void @llvm.dbg.assign(metadata, metadata, metadata, metadata, metadata, metadata) #3 65 66!llvm.dbg.cu = !{!0} 67!llvm.module.flags = !{!3, !4, !5, !1000} 68!llvm.ident = !{!6} 69 70!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) 71!1 = !DIFile(filename: "reduce.c", directory: "/") 72!2 = !{} 73!3 = !{i32 7, !"Dwarf Version", i32 4} 74!4 = !{i32 2, !"Debug Info Version", i32 3} 75!5 = !{i32 1, !"wchar_size", i32 4} 76!6 = !{!"clang version 12.0.0"} 77!7 = distinct !DISubprogram(name: "b", scope: !1, file: !1, line: 3, type: !8, scopeLine: 3, flags: DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !10) 78!8 = !DISubroutineType(types: !9) 79!9 = !{null} 80!10 = !{!11} 81!11 = !DILocalVariable(name: "c", scope: !7, file: !1, line: 4, type: !12) 82!12 = !DIBasicType(name: "char", size: 64, encoding: DW_ATE_unsigned) 83!13 = distinct !DIAssignID() 84!14 = !DILocation(line: 0, scope: !7) 85!15 = !DILocation(line: 4, column: 3, scope: !7) 86!16 = !DILocation(line: 4, column: 8, scope: !7) 87!20 = distinct !DIAssignID() 88!21 = !DILocation(line: 5, column: 3, scope: !7) 89!22 = !DILocation(line: 6, column: 3, scope: !7) 90!23 = !DILocation(line: 7, column: 1, scope: !7) 91!24 = !DISubprogram(name: "d", scope: !1, file: !1, line: 2, type: !25, spFlags: DISPFlagOptimized, retainedNodes: !2) 92!25 = !DISubroutineType(types: !26) 93!26 = !{null, null} 94!27 = !DISubprogram(name: "a", scope: !1, file: !1, line: 1, type: !28, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized, retainedNodes: !2) 95!28 = !DISubroutineType(types: !29) 96!29 = !{null, !30} 97!30 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !12, size: 64) 98!31 = distinct !DIAssignID() 99!1000 = !{i32 7, !"debug-info-assignment-tracking", i1 true} 100