1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py 2; Test that the getelementptr generated when the dse pass determines that 3; a memset can be shortened has the debugloc carried over from the memset. 4 5; RUN: opt -S -march=native -passes=dse < %s| FileCheck %s 6; CHECK: %{{[0-9]+}} = getelementptr inbounds i8, ptr %b, i64 32, !dbg ![[DBG:[0-9]+]] 7; CHECK-NEXT: call void @llvm.memset.p0.i64(ptr align 16 %0, i8 0, i64 8, i1 false), !dbg ![[DBG:[0-9]+]] 8; CHECK: ![[DBG]] = !DILocation(line: 2, 9 10; The test IR is generated by running: 11; 12; clang Debugify_Dead_Store_Elimination.cpp -Wno-c++11-narrowing -S \ 13; -emit-llvm -O0 -w -Xclang -disable-O0-optnone -march=native -fdeclspec \ 14; --target=x86_64-gnu-linux-unknown -Werror=unreachable-code -o - 15; 16; Where Debugify_Dead_Store_Elimination.cpp contains: 17; 18; int a() { 19; long b[]{2, 2, 2, 2, 0}; 20; if (a()) 21; ; 22; } 23 24 25declare void @use(ptr) 26 27define dso_local i32 @_Z1av() !dbg !7 { 28entry: 29 %retval = alloca i32, align 4 30 %b = alloca [5 x i64], align 16 31 call void @llvm.dbg.declare(metadata ptr %b, metadata !11, metadata !DIExpression()), !dbg !16 32 call void @llvm.memset.p0.i64(ptr align 16 %b, i8 0, i64 40, i1 false), !dbg !16 33 store i64 2, ptr %b, align 16, !dbg !16 34 %0 = getelementptr inbounds [5 x i64], ptr %b, i32 0, i32 1, !dbg !16 35 store i64 2, ptr %0, align 8, !dbg !16 36 %1 = getelementptr inbounds [5 x i64], ptr %b, i32 0, i32 2, !dbg !16 37 store i64 2, ptr %1, align 16, !dbg !16 38 %2 = getelementptr inbounds [5 x i64], ptr %b, i32 0, i32 3, !dbg !16 39 store i64 2, ptr %2, align 8, !dbg !16 40 call void @use(ptr %b) 41 %call = call i32 @_Z1av(), !dbg !17 42 %tobool = icmp ne i32 %call, 0, !dbg !17 43 br i1 %tobool, label %if.then, label %if.end, !dbg !19 44 45if.then: ; preds = %entry 46 br label %if.end, !dbg !19 47 48if.end: ; preds = %if.then, %entry 49 call void @llvm.trap(), !dbg !20 50 unreachable, !dbg !20 51 52return: ; No predecessors! 53 %3 = load i32, ptr %retval, align 4, !dbg !21 54 ret i32 %3, !dbg !21 55} 56 57; Function Attrs: nounwind readnone speculatable 58declare void @llvm.dbg.declare(metadata, metadata, metadata) 59 60; Function Attrs: argmemonly nounwind 61declare void @llvm.memset.p0.i64(ptr nocapture writeonly, i8, i64, i1 immarg) 62 63; Function Attrs: cold noreturn nounwind 64declare void @llvm.trap() 65 66!llvm.module.flags = !{!3, !4, !5} 67!llvm.ident = !{!6} 68 69!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 9.0.0 (https://github.com/llvm/llvm-project.git eb1a156d7f7ba56ea8f9a26da36e6a93d1e98bda)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, nameTableKind: None) 70!1 = !DIFile(filename: "Debugify_Dead_Store_Elimination.cpp", directory: "") 71!2 = !{} 72!3 = !{i32 2, !"Dwarf Version", i32 4} 73!4 = !{i32 2, !"Debug Info Version", i32 3} 74!5 = !{i32 1, !"wchar_size", i32 4} 75!6 = !{!"clang version 9.0.0 (https://github.com/llvm/llvm-project.git eb1a156d7f7ba56ea8f9a26da36e6a93d1e98bda)"} 76!7 = distinct !DISubprogram(name: "a", linkageName: "_Z1av", scope: !1, file: !1, line: 1, type: !8, scopeLine: 1, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !2) 77!8 = !DISubroutineType(types: !9) 78!9 = !{!10} 79!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed) 80!11 = !DILocalVariable(name: "b", scope: !7, file: !1, line: 2, type: !12) 81!12 = !DICompositeType(tag: DW_TAG_array_type, baseType: !13, size: 320, elements: !14) 82!13 = !DIBasicType(name: "long int", size: 64, encoding: DW_ATE_signed) 83!14 = !{!15} 84!15 = !DISubrange(count: 5) 85!16 = !DILocation(line: 2, column: 8, scope: !7) 86!17 = !DILocation(line: 3, column: 7, scope: !18) 87!18 = distinct !DILexicalBlock(scope: !7, file: !1, line: 3, column: 7) 88!19 = !DILocation(line: 3, column: 7, scope: !7) 89!20 = !DILocation(line: 3, column: 9, scope: !18) 90!21 = !DILocation(line: 5, column: 1, scope: !7) 91