1 ; RUN: opt -mem2reg -S < %s | FileCheck %s -implicit-check-not="call void @llvm.dbg.addr" 2 3 ; This example is intended to simulate this pass pipeline, which may not exist 4 ; in practice: 5 ; 1. DSE f from the original C source 6 ; 2. Inline escape 7 ; 3. mem2reg 8 ; This exercises the corner case of multiple llvm.dbg.addr intrinsics. 9 10 ; C source: 11 ; 12 ; void escape(int *px) { ++*px; } 13 ; extern int global; 14 ; void f(int x) { 15 ; escape(&x); 16 ; x = 1; // DSE should delete and insert dbg.value(i32 1) 17 ; global = x; 18 ; x = 2; // DSE should insert dbg.addr 19 ; escape(&x); 20 ; } 21 22 ; ModuleID = 'dse.c' 23 source_filename = "dse.c" 24 target datalayout = "e-m:w-i64:64-f80:128-n8:16:32:64-S128" 25 target triple = "x86_64-pc-windows-msvc19.0.24215" 26 27 declare void @llvm.dbg.addr(metadata, metadata, metadata) #2 28 declare void @llvm.dbg.value(metadata, metadata, metadata) #2 29 30 @global = external global i32, align 4 31 32 ; Function Attrs: nounwind uwtable 33 define void @f(i32 %x) #0 !dbg !8 { 34 entry: 35 %x.addr = alloca i32, align 4 36 store i32 %x, i32* %x.addr, align 4 37 call void @llvm.dbg.addr(metadata i32* %x.addr, metadata !13, metadata !DIExpression()), !dbg !18 38 %ld.1 = load i32, i32* %x.addr, align 4, !dbg !19 39 %inc.1 = add nsw i32 %ld.1, 1, !dbg !19 40 store i32 %inc.1, i32* %x.addr, align 4, !dbg !19 41 call void @llvm.dbg.value(metadata i32 1, metadata !13, metadata !DIExpression()), !dbg !20 42 store i32 1, i32* @global, align 4, !dbg !22 43 call void @llvm.dbg.addr(metadata i32* %x.addr, metadata !13, metadata !DIExpression()), !dbg !23 44 store i32 2, i32* %x.addr, align 4, !dbg !23 45 %ld.2 = load i32, i32* %x.addr, align 4, !dbg !19 46 %inc.2 = add nsw i32 %ld.2, 1, !dbg !19 47 store i32 %inc.2, i32* %x.addr, align 4, !dbg !19 48 ret void, !dbg !25 49 } 50 51 ; CHECK-LABEL: define void @f(i32 %x) 52 ; CHECK: call void @llvm.dbg.value(metadata i32 %x, metadata !13, metadata !DIExpression()) 53 ; CHECK: %inc.1 = add nsw i32 %x, 1 54 ; CHECK: call void @llvm.dbg.value(metadata i32 %inc.1, metadata !13, metadata !DIExpression()) 55 ; CHECK: call void @llvm.dbg.value(metadata i32 1, metadata !13, metadata !DIExpression()) 56 ; CHECK: store i32 1, i32* @global, align 4 57 ; CHECK: call void @llvm.dbg.value(metadata i32 2, metadata !13, metadata !DIExpression()) 58 ; CHECK: %inc.2 = add nsw i32 2, 1 59 ; CHECK: call void @llvm.dbg.value(metadata i32 %inc.2, metadata !13, metadata !DIExpression()) 60 ; CHECK: ret void 61 62 attributes #0 = { nounwind uwtable } 63 attributes #2 = { nounwind readnone speculatable } 64 65 !llvm.dbg.cu = !{!0} 66 !llvm.module.flags = !{!3, !4, !5, !6} 67 !llvm.ident = !{!7} 68 69 !0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 6.0.0 ", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2) 70 !1 = !DIFile(filename: "dse.c", directory: "C:\5Csrc\5Cllvm-project\5Cbuild") 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 2} 75 !6 = !{i32 7, !"PIC Level", i32 2} 76 !7 = !{!"clang version 6.0.0 "} 77 !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, retainedNodes: !12) 78 !9 = !DISubroutineType(types: !10) 79 !10 = !{null, !11} 80 !11 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed) 81 !12 = !{!13} 82 !13 = !DILocalVariable(name: "x", arg: 1, scope: !8, file: !1, line: 3, type: !11) 83 !14 = !{!15, !15, i64 0} 84 !15 = !{!"int", !16, i64 0} 85 !16 = !{!"omnipotent char", !17, i64 0} 86 !17 = !{!"Simple C/C++ TBAA"} 87 !18 = !DILocation(line: 3, column: 12, scope: !8) 88 !19 = !DILocation(line: 4, column: 3, scope: !8) 89 !20 = !DILocation(line: 5, column: 5, scope: !8) 90 !21 = !DILocation(line: 6, column: 12, scope: !8) 91 !22 = !DILocation(line: 6, column: 10, scope: !8) 92 !23 = !DILocation(line: 7, column: 5, scope: !8) 93 !24 = !DILocation(line: 8, column: 3, scope: !8) 94 !25 = !DILocation(line: 9, column: 1, scope: !8) 95
