trapping-load-unreachable.ll
2.5 KB
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
; RUN: opt < %s -simplifycfg -S | FileCheck %s
; PR2967
target datalayout =
"e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32"
target triple = "i386-pc-linux-gnu"
define void @test1(i32 %x) nounwind {
entry:
%0 = icmp eq i32 %x, 0 ; <i1> [#uses=1]
br i1 %0, label %bb, label %return
bb: ; preds = %entry
%1 = load volatile i32, i32* null
unreachable
br label %return
return: ; preds = %entry
ret void
; CHECK-LABEL: @test1(
; CHECK: load volatile
}
define void @test1_no_null_opt(i32 %x) nounwind #0 {
entry:
%0 = icmp eq i32 %x, 0 ; <i1> [#uses=1]
br i1 %0, label %bb, label %return
bb: ; preds = %entry
%1 = load volatile i32, i32* null
unreachable
br label %return
return: ; preds = %entry
ret void
; CHECK-LABEL: @test1_no_null_opt(
; CHECK: load volatile
; CHECK: unreachable
}
; rdar://7958343
define void @test2() nounwind {
entry:
store i32 4,i32* null
ret void
; CHECK-LABEL: @test2(
; CHECK: call void @llvm.trap
; CHECK: unreachable
}
define void @test2_no_null_opt() nounwind #0 {
entry:
store i32 4,i32* null
ret void
; CHECK-LABEL: @test2_no_null_opt(
; CHECK: store i32 4, i32* null
; CHECK-NOT: call void @llvm.trap
; CHECK: ret
}
; PR7369
define void @test3() nounwind {
entry:
store volatile i32 4, i32* null
ret void
; CHECK-LABEL: @test3(
; CHECK: store volatile i32 4, i32* null
; CHECK: ret
}
define void @test3_no_null_opt() nounwind #0 {
entry:
store volatile i32 4, i32* null
ret void
; CHECK-LABEL: @test3_no_null_opt(
; CHECK: store volatile i32 4, i32* null
; CHECK: ret
}
; Check store before unreachable.
define void @test4(i1 %C, i32* %P) {
; CHECK-LABEL: @test4(
; CHECK: entry:
; CHECK-NEXT: br i1 %C
entry:
br i1 %C, label %T, label %F
T:
store volatile i32 0, i32* %P
unreachable
F:
ret void
}
; Check cmpxchg before unreachable.
define void @test5(i1 %C, i32* %P) {
; CHECK-LABEL: @test5(
; CHECK: entry:
; CHECK-NEXT: br i1 %C
entry:
br i1 %C, label %T, label %F
T:
cmpxchg volatile i32* %P, i32 0, i32 1 seq_cst seq_cst
unreachable
F:
ret void
}
; Check atomicrmw before unreachable.
define void @test6(i1 %C, i32* %P) {
; CHECK-LABEL: @test6(
; CHECK: entry:
; CHECK-NEXT: br i1 %C
entry:
br i1 %C, label %T, label %F
T:
atomicrmw volatile xchg i32* %P, i32 0 seq_cst
unreachable
F:
ret void
}
attributes #0 = { null_pointer_is_valid }