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
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
|
; RUN: opt < %s -passes=gvn -disable-output -pass-remarks=gvn -pass-remarks-missed=gvn \
; RUN: 2>&1 | FileCheck %s
; RUN: opt < %s -passes=gvn -disable-output -pass-remarks-output=%t -S
; RUN: cat %t | FileCheck -check-prefix=YAML %s
; RUN: opt < %s -aa-pipeline=basic-aa -passes=gvn -disable-output -pass-remarks=gvn -pass-remarks-missed=gvn \
; RUN: 2>&1 | FileCheck %s
; RUN: opt < %s -aa-pipeline=basic-aa -passes=gvn -disable-output -pass-remarks-output=%t -S
; RUN: cat %t | FileCheck -check-prefix=YAML %s
; CHECK: remark: <unknown>:0:0: load of type i32 eliminated{{$}}
; CHECK-NEXT: remark: <unknown>:0:0: load of type i32 eliminated{{$}}
; CHECK-NEXT: remark: <unknown>:0:0: load of type i32 eliminated{{$}}
; CHECK-NEXT: remark: /tmp/s.c:3:3: load of type i32 not eliminated
; YAML: --- !Passed
; YAML-NEXT: Pass: gvn
; YAML-NEXT: Name: LoadElim
; YAML-NEXT: Function: arg
; YAML-NEXT: Args:
; YAML-NEXT: - String: 'load of type '
; YAML-NEXT: - Type: i32
; YAML-NEXT: - String: ' eliminated'
; YAML-NEXT: - String: ' in favor of '
; YAML-NEXT: - InfavorOfValue: i
; YAML-NEXT: ...
; YAML-NEXT: --- !Passed
; YAML-NEXT: Pass: gvn
; YAML-NEXT: Name: LoadElim
; YAML-NEXT: Function: const
; YAML-NEXT: Args:
; YAML-NEXT: - String: 'load of type '
; YAML-NEXT: - Type: i32
; YAML-NEXT: - String: ' eliminated'
; YAML-NEXT: - String: ' in favor of '
; YAML-NEXT: - InfavorOfValue: '4'
; YAML-NEXT: ...
; YAML-NEXT: --- !Passed
; YAML-NEXT: Pass: gvn
; YAML-NEXT: Name: LoadElim
; YAML-NEXT: Function: inst
; YAML-NEXT: Args:
; YAML-NEXT: - String: 'load of type '
; YAML-NEXT: - Type: i32
; YAML-NEXT: - String: ' eliminated'
; YAML-NEXT: - String: ' in favor of '
; YAML-NEXT: - InfavorOfValue: load
; YAML-NEXT: ...
; YAML-NEXT: --- !Missed
; YAML-NEXT: Pass: gvn
; YAML-NEXT: Name: LoadClobbered
; YAML-NEXT: DebugLoc: { File: '/tmp/s.c', Line: 3, Column: 3 }
; YAML-NEXT: Function: may_alias
; YAML-NEXT: Args:
; YAML-NEXT: - String: 'load of type '
; YAML-NEXT: - Type: i32
; YAML-NEXT: - String: ' not eliminated'
; YAML-NEXT: - String: ' in favor of '
; YAML-NEXT: - OtherAccess: load
; YAML-NEXT: DebugLoc: { File: '/tmp/s.c', Line: 1, Column: 13 }
; YAML-NEXT: - String: ' because it is clobbered by '
; YAML-NEXT: - ClobberedBy: store
; YAML-NEXT: DebugLoc: { File: '/tmp/s.c', Line: 2, Column: 10 }
; YAML-NEXT: ...
; YAML-NEXT: --- !Missed
; YAML-NEXT: Pass: gvn
; YAML-NEXT: Name: LoadClobbered
; YAML-NEXT: Function: lifetime_end
; YAML-NEXT: Args:
; YAML-NEXT: - String: 'load of type '
; YAML-NEXT: - Type: i8
; YAML-NEXT: - String: ' not eliminated'
; YAML-NEXT: - String: ' in favor of '
; YAML-NEXT: - OtherAccess: store
; YAML-NEXT: - String: ' because it is clobbered by '
; YAML-NEXT: - ClobberedBy: call llvm.lifetime.end.p0
; YAML-NEXT: ...
define i32 @arg(ptr %p, i32 %i) {
entry:
store i32 %i, ptr %p
%load = load i32, ptr %p
ret i32 %load
}
define i32 @const(ptr %p) {
entry:
store i32 4, ptr %p
%load = load i32, ptr %p
ret i32 %load
}
define i32 @inst(ptr %p) {
entry:
%load1 = load i32, ptr %p
%load = load i32, ptr %p
%add = add i32 %load1, %load
ret i32 %add
}
define i32 @may_alias(ptr %p, ptr %r) !dbg !7 {
entry:
%load1 = load i32, ptr %p, !tbaa !13, !dbg !9
store i32 4, ptr %r, !tbaa !13, !dbg !10
%load = load i32, ptr %p, !tbaa !13, !dbg !11
%add = add i32 %load1, %load
ret i32 %add
}
define i8 @lifetime_end(ptr %p, i8 %val) {
call void @llvm.lifetime.start.p0(i64 32, ptr %p)
store i8 %val, ptr %p
call void @llvm.lifetime.end.p0(i64 32, ptr %p)
%1 = load i8, ptr %p
ret i8 %1
}
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!3, !4, !5}
!llvm.ident = !{!6}
!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 4.0.0 (trunk 282540) (llvm/trunk 282542)", isOptimized: true, runtimeVersion: 0, emissionKind: LineTablesOnly, enums: !2)
!1 = !DIFile(filename: "/tmp/s.c", directory: "/tmp")
!2 = !{}
!3 = !{i32 2, !"Dwarf Version", i32 4}
!4 = !{i32 2, !"Debug Info Version", i32 3}
!5 = !{i32 1, !"PIC Level", i32 2}
!6 = !{!"clang version 4.0.0 (trunk 282540) (llvm/trunk 282542)"}
!7 = distinct !DISubprogram(name: "may_alias", scope: !1, file: !1, line: 1, type: !8, isLocal: false, isDefinition: true, scopeLine: 1, isOptimized: true, unit: !0, retainedNodes: !2)
!8 = !DISubroutineType(types: !2)
!9 = !DILocation(line: 1, column: 13, scope: !7)
!10 = !DILocation(line: 2, column: 10, scope: !7)
!11 = !DILocation(line: 3, column: 3, scope: !7)
!12 = !{ !"tbaa root" }
!13 = !{ !"int", !12 }
|
