forked from llvm/llvm-project
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathdbg-addr-inline-dse.ll
94 lines (84 loc) · 3.85 KB
/
dbg-addr-inline-dse.ll
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
; RUN: opt -passes=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, retainedNodes: !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)