1 ; RUN: opt -mem2reg -S < %s | FileCheck %s -implicit-check-not="call void @llvm.dbg.addr"
3 ; This example is intended to simulate this pass pipeline, which may not exist
5 ; 1. DSE f from the original C source
8 ; This exercises the corner case of multiple llvm.dbg.addr intrinsics.
12 ; void escape(int *px) { ++*px; }
16 ; x = 1; // DSE should delete and insert dbg.value(i32 1)
18 ; x = 2; // DSE should insert dbg.addr
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"
27 declare void @llvm.dbg.addr(metadata, metadata, metadata) #2
28 declare void @llvm.dbg.value(metadata, metadata, metadata) #2
30 @global = external global i32, align 4
32 ; Function Attrs: nounwind uwtable
33 define void @f(i32 %x) #0 !dbg !8 {
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
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())
62 attributes #0 = { nounwind uwtable }
63 attributes #2 = { nounwind readnone speculatable }
66 !llvm.module.flags = !{!3, !4, !5, !6}
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")
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)
80 !11 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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)