1; RUN: llc %s -stop-before=finalize-isel -o - \ 2; RUN: | FileCheck %s 3 4 5; RUN: llc --try-experimental-debuginfo-iterators %s -stop-before=finalize-isel -o - \ 6; RUN: | FileCheck %s 7 8; Check basic lowering behaviour of dbg.assign intrinsics. The first 9; assignment to `local`, which has been DSE'd, should be represented with a 10; constant value DBG_VALUE. The second assignment should have a DBG_VALUE 11; describing the stack home of the variable. 12 13; $ cat test.c 14; void esc(int*); 15; void fun() { 16; int local = 5; 17; // ^ killed by v 18; local = 6; 19; esc(&local); 20; } 21; $ clang -O2 -g -emit -llvm -S test.c -o - 22 23; CHECK: ![[LOCAL:[0-9]+]] = !DILocalVariable(name: "local", 24; CHECK: DBG_VALUE 5, $noreg, ![[LOCAL]], !DIExpression(), debug-location ![[DBG:[0-9]+]] 25; CHECK-NEXT: MOV32mi [[DEST:.*]], 1, $noreg, 0, $noreg, 6 26; CHECK-NEXT: DBG_VALUE [[DEST]], $noreg, ![[LOCAL]], !DIExpression(DW_OP_deref), debug-location ![[DBG]] 27 28target triple = "x86_64-unknown-linux-gnu" 29 30define dso_local void @fun() local_unnamed_addr !dbg !7 { 31entry: 32 %local = alloca i32, align 4 33 call void @llvm.dbg.assign(metadata i32 5, metadata !11, metadata !DIExpression(), metadata !30, metadata ptr %local, metadata !DIExpression()), !dbg !16 34 store i32 6, ptr %local, align 4, !dbg !23, !DIAssignID !31 35 call void @llvm.dbg.assign(metadata i32 6, metadata !11, metadata !DIExpression(), metadata !31, metadata ptr %local, metadata !DIExpression()), !dbg !16 36 call void @esc(ptr nonnull %local), !dbg !24 37 ret void, !dbg !25 38} 39 40declare void @llvm.dbg.assign(metadata, metadata, metadata, metadata, metadata, metadata) 41 42declare !dbg !26 dso_local void @esc(ptr) local_unnamed_addr 43 44!llvm.dbg.cu = !{!0} 45!llvm.module.flags = !{!3, !4, !5, !1000} 46!llvm.ident = !{!6} 47 48!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) 49!1 = !DIFile(filename: "test.c", directory: "/") 50!2 = !{} 51!3 = !{i32 7, !"Dwarf Version", i32 4} 52!4 = !{i32 2, !"Debug Info Version", i32 3} 53!5 = !{i32 1, !"wchar_size", i32 4} 54!6 = !{!"clang version 12.0.0"} 55!7 = distinct !DISubprogram(name: "fun", scope: !1, file: !1, line: 2, type: !8, scopeLine: 2, flags: DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !10) 56!8 = !DISubroutineType(types: !9) 57!9 = !{null} 58!10 = !{!11} 59!11 = !DILocalVariable(name: "local", scope: !7, file: !1, line: 3, type: !12) 60!12 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed) 61!14 = !DIDerivedType(tag: DW_TAG_volatile_type, baseType: !12) 62!15 = !DILocation(line: 3, column: 3, scope: !7) 63!16 = !DILocation(line: 0, scope: !7) 64!17 = !DILocation(line: 4, column: 3, scope: !7) 65!18 = !DILocation(line: 4, column: 16, scope: !7) 66!23 = !DILocation(line: 5, column: 9, scope: !7) 67!24 = !DILocation(line: 6, column: 3, scope: !7) 68!25 = !DILocation(line: 7, column: 1, scope: !7) 69!26 = !DISubprogram(name: "esc", scope: !1, file: !1, line: 1, type: !27, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized, retainedNodes: !2) 70!27 = !DISubroutineType(types: !28) 71!28 = !{null, !29} 72!29 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !12, size: 64) 73!30 = distinct !DIAssignID() 74!31 = distinct !DIAssignID() 75 76!1000 = !{i32 7, !"debug-info-assignment-tracking", i1 true} 77