| Reid Kleckner | 72b819b | 2017-11-15 18:51:12 +0000 | [diff] [blame] | 1 | ; RUN: opt -instcombine -S %s -o - | FileCheck %s |
| 2 | |
| 3 | ; In this example, the cast from i8* to i32* becomes trivially dead. We should |
| 4 | ; salvage its debug info. |
| 5 | |
| 6 | ; C source: |
| 7 | ; void use_as_void(void *); |
| 8 | ; void f(void *p) { |
| 9 | ; int *q = (int *)p; |
| 10 | ; use_as_void(q); |
| 11 | ; } |
| 12 | |
| 13 | ; ModuleID = '<stdin>' |
| 14 | source_filename = "t.c" |
| 15 | target datalayout = "e-m:w-i64:64-f80:128-n8:16:32:64-S128" |
| 16 | target triple = "x86_64-pc-windows-msvc19.11.25508" |
| 17 | |
| 18 | ; Function Attrs: nounwind uwtable |
| 19 | define void @f(i8* %p) !dbg !11 { |
| 20 | entry: |
| 21 | call void @llvm.dbg.value(metadata i8* %p, metadata !16, metadata !DIExpression()), !dbg !18 |
| 22 | %0 = bitcast i8* %p to i32*, !dbg !19 |
| 23 | call void @llvm.dbg.value(metadata i32* %0, metadata !17, metadata !DIExpression()), !dbg !20 |
| 24 | %1 = bitcast i32* %0 to i8*, !dbg !21 |
| 25 | call void @use_as_void(i8* %1), !dbg !22 |
| 26 | ret void, !dbg !23 |
| 27 | } |
| 28 | |
| 29 | ; CHECK-LABEL: define void @f(i8* %p) |
| 30 | ; CHECK: call void @llvm.dbg.value(metadata i8* %p, metadata ![[P_VAR:[0-9]+]], metadata !DIExpression()) |
| 31 | ; CHECK-NOT: bitcast |
| 32 | ; CHECK: call void @llvm.dbg.value(metadata i8* %p, metadata ![[Q_VAR:[0-9]+]], metadata !DIExpression()) |
| 33 | ; CHECK-NOT: bitcast |
| 34 | ; CHECK ret void |
| 35 | |
| 36 | ; CHECK: ![[P_VAR]] = !DILocalVariable(name: "p", {{.*}}) |
| 37 | ; CHECK: ![[Q_VAR]] = !DILocalVariable(name: "q", {{.*}}) |
| 38 | |
| 39 | declare void @use_as_void(i8*) |
| 40 | |
| 41 | declare void @llvm.dbg.value(metadata, metadata, metadata) |
| 42 | |
| 43 | !llvm.dbg.cu = !{!0} |
| 44 | !llvm.module.flags = !{!6, !7, !8, !9} |
| 45 | !llvm.ident = !{!10} |
| 46 | |
| 47 | !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) |
| 48 | !1 = !DIFile(filename: "t.c", directory: "C:\5Csrc\5Cllvm-project\5Cbuild", checksumkind: CSK_MD5, checksum: "56c40617ada23a8cccbd9a16bcec57af") |
| 49 | !2 = !{} |
| 50 | !3 = !{!4} |
| 51 | !4 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !5, size: 64) |
| 52 | !5 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed) |
| 53 | !6 = !{i32 2, !"CodeView", i32 1} |
| 54 | !7 = !{i32 2, !"Debug Info Version", i32 3} |
| 55 | !8 = !{i32 1, !"wchar_size", i32 2} |
| 56 | !9 = !{i32 7, !"PIC Level", i32 2} |
| 57 | !10 = !{!"clang version 6.0.0 "} |
| Shiva Chen | 2c86455 | 2018-05-09 02:40:45 +0000 | [diff] [blame] | 58 | !11 = distinct !DISubprogram(name: "f", scope: !1, file: !1, line: 2, type: !12, isLocal: false, isDefinition: true, scopeLine: 2, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !15) |
| Reid Kleckner | 72b819b | 2017-11-15 18:51:12 +0000 | [diff] [blame] | 59 | !12 = !DISubroutineType(types: !13) |
| 60 | !13 = !{null, !14} |
| 61 | !14 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 64) |
| 62 | !15 = !{!16, !17} |
| 63 | !16 = !DILocalVariable(name: "p", arg: 1, scope: !11, file: !1, line: 2, type: !14) |
| 64 | !17 = !DILocalVariable(name: "q", scope: !11, file: !1, line: 3, type: !4) |
| 65 | !18 = !DILocation(line: 2, column: 14, scope: !11) |
| 66 | !19 = !DILocation(line: 3, column: 12, scope: !11) |
| 67 | !20 = !DILocation(line: 3, column: 8, scope: !11) |
| 68 | !21 = !DILocation(line: 4, column: 15, scope: !11) |
| 69 | !22 = !DILocation(line: 4, column: 3, scope: !11) |
| 70 | !23 = !DILocation(line: 5, column: 1, scope: !11) |