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
|
; RUN: opt -licm -basic-aa < %s -S | FileCheck %s
; RUN: opt -aa-pipeline=basic-aa -passes='require<aa>,require<targetir>,require<scalar-evolution>,require<opt-remark-emit>,loop(licm)' < %s -S | FileCheck %s
define void @test1(i64 %n) {
; CHECK-LABEL: @test1
; CHECK: fence
; CHECK-LABEL: loop:
entry:
br label %loop
loop:
%iv = phi i64 [0, %entry], [%iv.next, %loop]
fence release
%iv.next = add i64 %iv, 1
%test = icmp slt i64 %iv, %n
br i1 %test, label %loop, label %exit
exit:
ret void
}
define void @test2(i64 %n) {
; CHECK-LABEL: @test2
; CHECK: fence
; CHECK-LABEL: loop:
entry:
br label %loop
loop:
%iv = phi i64 [0, %entry], [%iv.next, %loop]
fence acquire
%iv.next = add i64 %iv, 1
%test = icmp slt i64 %iv, %n
br i1 %test, label %loop, label %exit
exit:
ret void
}
define void @test3(i64 %n) {
; CHECK-LABEL: @test3
; CHECK: fence
; CHECK-LABEL: loop:
entry:
br label %loop
loop:
%iv = phi i64 [0, %entry], [%iv.next, %loop]
fence acq_rel
%iv.next = add i64 %iv, 1
%test = icmp slt i64 %iv, %n
br i1 %test, label %loop, label %exit
exit:
ret void
}
define void @test4(i64 %n) {
; CHECK-LABEL: @test4
; CHECK: fence
; CHECK-LABEL: loop:
entry:
br label %loop
loop:
%iv = phi i64 [0, %entry], [%iv.next, %loop]
fence seq_cst
%iv.next = add i64 %iv, 1
%test = icmp slt i64 %iv, %n
br i1 %test, label %loop, label %exit
exit:
ret void
}
define void @testneg1(i64 %n, i64* %p) {
; CHECK-LABEL: @testneg1
; CHECK-LABEL: loop:
; CHECK: fence
entry:
br label %loop
loop:
%iv = phi i64 [0, %entry], [%iv.next, %loop]
store i64 %iv, i64* %p
fence release
%iv.next = add i64 %iv, 1
%test = icmp slt i64 %iv, %n
br i1 %test, label %loop, label %exit
exit:
ret void
}
define void @testneg2(i64* %p) {
; CHECK-LABEL: @testneg2
; CHECK-LABEL: loop:
; CHECK: fence
entry:
br label %loop
loop:
%iv = phi i64 [0, %entry], [%iv.next, %loop]
fence acquire
%n = load i64, i64* %p
%iv.next = add i64 %iv, 1
%test = icmp slt i64 %iv, %n
br i1 %test, label %loop, label %exit
exit:
ret void
}
; Note: While a false negative for LICM on it's own, O3 does get this
; case by combining the fences.
define void @testfn1(i64 %n, i64* %p) {
; CHECK-LABEL: @testfn1
; CHECK-LABEL: loop:
; CHECK: fence
entry:
br label %loop
loop:
%iv = phi i64 [0, %entry], [%iv.next, %loop]
fence release
fence release
%iv.next = add i64 %iv, 1
%test = icmp slt i64 %iv, %n
br i1 %test, label %loop, label %exit
exit:
ret void
}
|
