forked from OSchip/llvm-project
95 lines
4.0 KiB
LLVM
95 lines
4.0 KiB
LLVM
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; RUN: opt < %s -S -instcombine -instcombine-lower-dbg-declare=0 | FileCheck %s
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; In this example, instcombine wants to turn "local" into an i64, since that's
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; how it is stored. It should keep the debug info referring to the alloca when
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; it does the replacement.
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; C source:
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; struct Foo {
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; int x, y;
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; };
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; void escape(const void*);
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; void f(struct Foo *p) {
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; struct Foo local;
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; *(__int64 *)&local = *(__int64 *)p;
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; escape(&local);
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; }
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; ModuleID = '<stdin>'
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source_filename = "t.c"
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target datalayout = "e-m:w-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-pc-windows-msvc19.11.25508"
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%struct.Foo = type { i32, i32 }
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define void @f(%struct.Foo* %p) !dbg !11 {
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entry:
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%local = alloca %struct.Foo, align 4
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%0 = bitcast %struct.Foo* %local to i8*, !dbg !24
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call void @llvm.dbg.declare(metadata %struct.Foo* %local, metadata !22, metadata !DIExpression()), !dbg !25
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%1 = bitcast %struct.Foo* %p to i64*, !dbg !26
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%2 = load i64, i64* %1, align 8, !dbg !26, !tbaa !27
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%3 = bitcast %struct.Foo* %local to i64*, !dbg !31
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store i64 %2, i64* %3, align 4, !dbg !32, !tbaa !27
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%4 = bitcast %struct.Foo* %local to i8*, !dbg !33
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call void @escape(i8* %4), !dbg !34
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%5 = bitcast %struct.Foo* %local to i8*, !dbg !35
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ret void, !dbg !35
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}
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; CHECK-LABEL: define void @f(%struct.Foo* %p)
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; CHECK: %local = alloca i64, align 8
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; CHECK: call void @llvm.dbg.declare(metadata i64* %local, metadata !22, metadata !DIExpression())
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; CHECK: [[simplified:%.*]] = bitcast i64* %local to i8*
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;
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; Another dbg.value for "local" would be redundant here.
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; CHECK-NOT: call void @llvm.dbg.value(metadata i8* [[simplified]], metadata !22, metadata !DIExpression())
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;
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; CHECK: call void @escape(i8* nonnull [[simplified]])
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; CHECK: ret void
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declare void @llvm.dbg.declare(metadata, metadata, metadata)
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declare void @escape(i8*)
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!6, !7, !8, !9}
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!llvm.ident = !{!10}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 6.0.0 ", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, retainedTypes: !3)
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!1 = !DIFile(filename: "t.c", directory: "C:\5Csrc\5Cllvm-project\5Cbuild", checksumkind: CSK_MD5, checksum: "d7473625866433067a75fd7d03d2abf7")
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!2 = !{}
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!3 = !{!4}
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!4 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !5, size: 64)
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!5 = !DIBasicType(name: "long long int", size: 64, encoding: DW_ATE_signed)
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!6 = !{i32 2, !"CodeView", i32 1}
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!7 = !{i32 2, !"Debug Info Version", i32 3}
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!8 = !{i32 1, !"wchar_size", i32 2}
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!9 = !{i32 7, !"PIC Level", i32 2}
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!10 = !{!"clang version 6.0.0 "}
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!11 = distinct !DISubprogram(name: "f", scope: !1, file: !1, line: 5, type: !12, isLocal: false, isDefinition: true, scopeLine: 5, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !20)
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!12 = !DISubroutineType(types: !13)
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!13 = !{null, !14}
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!14 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !15, size: 64)
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!15 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "Foo", file: !1, line: 1, size: 64, elements: !16)
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!16 = !{!17, !19}
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!17 = !DIDerivedType(tag: DW_TAG_member, name: "x", scope: !15, file: !1, line: 2, baseType: !18, size: 32)
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!18 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!19 = !DIDerivedType(tag: DW_TAG_member, name: "y", scope: !15, file: !1, line: 2, baseType: !18, size: 32, offset: 32)
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!20 = !{!21, !22}
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!21 = !DILocalVariable(name: "p", arg: 1, scope: !11, file: !1, line: 5, type: !14)
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!22 = !DILocalVariable(name: "local", scope: !11, file: !1, line: 6, type: !15)
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!23 = !DILocation(line: 5, column: 20, scope: !11)
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!24 = !DILocation(line: 6, column: 3, scope: !11)
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!25 = !DILocation(line: 6, column: 14, scope: !11)
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!26 = !DILocation(line: 7, column: 24, scope: !11)
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!27 = !{!28, !28, i64 0}
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!28 = !{!"long long", !29, i64 0}
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!29 = !{!"omnipotent char", !30, i64 0}
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!30 = !{!"Simple C/C++ TBAA"}
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!31 = !DILocation(line: 7, column: 3, scope: !11)
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!32 = !DILocation(line: 7, column: 22, scope: !11)
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!33 = !DILocation(line: 8, column: 10, scope: !11)
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!34 = !DILocation(line: 8, column: 3, scope: !11)
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!35 = !DILocation(line: 9, column: 1, scope: !11)
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