diff options
Diffstat (limited to 'llvm/test/Transforms/Mem2Reg/dbg-addr-inline-dse.ll')
| -rw-r--r-- | llvm/test/Transforms/Mem2Reg/dbg-addr-inline-dse.ll | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/llvm/test/Transforms/Mem2Reg/dbg-addr-inline-dse.ll b/llvm/test/Transforms/Mem2Reg/dbg-addr-inline-dse.ll new file mode 100644 index 00000000000..8fe2e0ab317 --- /dev/null +++ b/llvm/test/Transforms/Mem2Reg/dbg-addr-inline-dse.ll @@ -0,0 +1,94 @@ +; RUN: opt -mem2reg -S < %s | FileCheck %s -implicit-check-not="call void @llvm.dbg.addr" + +; This example is intended to simulate this pass pipeline, which may not exist +; in practice: +; 1. DSE f from the original C source +; 2. Inline escape +; 3. mem2reg +; This exercises the corner case of multiple llvm.dbg.addr intrinsics. + +; C source: +; +; void escape(int *px) { ++*px; } +; extern int global; +; void f(int x) { +; escape(&x); +; x = 1; // DSE should delete and insert dbg.value(i32 1) +; global = x; +; x = 2; // DSE should insert dbg.addr +; escape(&x); +; } + +; ModuleID = 'dse.c' +source_filename = "dse.c" +target datalayout = "e-m:w-i64:64-f80:128-n8:16:32:64-S128" +target triple = "x86_64-pc-windows-msvc19.0.24215" + +declare void @llvm.dbg.addr(metadata, metadata, metadata) #2 +declare void @llvm.dbg.value(metadata, metadata, metadata) #2 + +@global = external global i32, align 4 + +; Function Attrs: nounwind uwtable +define void @f(i32 %x) #0 !dbg !8 { +entry: + %x.addr = alloca i32, align 4 + store i32 %x, i32* %x.addr, align 4 + call void @llvm.dbg.addr(metadata i32* %x.addr, metadata !13, metadata !DIExpression()), !dbg !18 + %ld.1 = load i32, i32* %x.addr, align 4, !dbg !19 + %inc.1 = add nsw i32 %ld.1, 1, !dbg !19 + store i32 %inc.1, i32* %x.addr, align 4, !dbg !19 + call void @llvm.dbg.value(metadata i32 1, metadata !13, metadata !DIExpression()), !dbg !20 + store i32 1, i32* @global, align 4, !dbg !22 + call void @llvm.dbg.addr(metadata i32* %x.addr, metadata !13, metadata !DIExpression()), !dbg !23 + store i32 2, i32* %x.addr, align 4, !dbg !23 + %ld.2 = load i32, i32* %x.addr, align 4, !dbg !19 + %inc.2 = add nsw i32 %ld.2, 1, !dbg !19 + store i32 %inc.2, i32* %x.addr, align 4, !dbg !19 + ret void, !dbg !25 +} + +; CHECK-LABEL: define void @f(i32 %x) +; CHECK: call void @llvm.dbg.value(metadata i32 %x, metadata !13, metadata !DIExpression()) +; CHECK: %inc.1 = add nsw i32 %x, 1 +; CHECK: call void @llvm.dbg.value(metadata i32 %inc.1, metadata !13, metadata !DIExpression()) +; CHECK: call void @llvm.dbg.value(metadata i32 1, metadata !13, metadata !DIExpression()) +; CHECK: store i32 1, i32* @global, align 4 +; CHECK: call void @llvm.dbg.value(metadata i32 2, metadata !13, metadata !DIExpression()) +; CHECK: %inc.2 = add nsw i32 2, 1 +; CHECK: call void @llvm.dbg.value(metadata i32 %inc.2, metadata !13, metadata !DIExpression()) +; CHECK: ret void + +attributes #0 = { nounwind uwtable } +attributes #2 = { nounwind readnone speculatable } + +!llvm.dbg.cu = !{!0} +!llvm.module.flags = !{!3, !4, !5, !6} +!llvm.ident = !{!7} + +!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 6.0.0 ", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2) +!1 = !DIFile(filename: "dse.c", directory: "C:\5Csrc\5Cllvm-project\5Cbuild") +!2 = !{} +!3 = !{i32 2, !"Dwarf Version", i32 4} +!4 = !{i32 2, !"Debug Info Version", i32 3} +!5 = !{i32 1, !"wchar_size", i32 2} +!6 = !{i32 7, !"PIC Level", i32 2} +!7 = !{!"clang version 6.0.0 "} +!8 = distinct !DISubprogram(name: "f", scope: !1, file: !1, line: 3, type: !9, isLocal: false, isDefinition: true, scopeLine: 3, flags: DIFlagPrototyped, isOptimized: true, unit: !0, variables: !12) +!9 = !DISubroutineType(types: !10) +!10 = !{null, !11} +!11 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed) +!12 = !{!13} +!13 = !DILocalVariable(name: "x", arg: 1, scope: !8, file: !1, line: 3, type: !11) +!14 = !{!15, !15, i64 0} +!15 = !{!"int", !16, i64 0} +!16 = !{!"omnipotent char", !17, i64 0} +!17 = !{!"Simple C/C++ TBAA"} +!18 = !DILocation(line: 3, column: 12, scope: !8) +!19 = !DILocation(line: 4, column: 3, scope: !8) +!20 = !DILocation(line: 5, column: 5, scope: !8) +!21 = !DILocation(line: 6, column: 12, scope: !8) +!22 = !DILocation(line: 6, column: 10, scope: !8) +!23 = !DILocation(line: 7, column: 5, scope: !8) +!24 = !DILocation(line: 8, column: 3, scope: !8) +!25 = !DILocation(line: 9, column: 1, scope: !8) |
