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
|
; RUN: opt < %s -S -loop-unroll -unroll-count=4 | FileCheck -check-prefix=CHECK_COUNT4 %s
; RUN: opt < %s -S -loop-unroll | FileCheck -check-prefix=CHECK_NOCOUNT %s
;///////////////////// TEST 1 //////////////////////////////
; This test shows that the loop is unrolled according to the specified
; unroll factor.
define void @Test1() nounwind {
entry:
br label %loop
loop:
%iv = phi i32 [ 0, %entry ], [ %inc, %loop ]
%inc = add i32 %iv, 1
%exitcnd = icmp uge i32 %inc, 1024
br i1 %exitcnd, label %exit, label %loop
exit:
ret void
}
; CHECK_COUNT4-LABEL: @Test1
; CHECK_COUNT4: phi
; CHECK_COUNT4-NEXT: add
; CHECK_COUNT4-NEXT: add
; CHECK_COUNT4-NEXT: add
; CHECK_COUNT4-NEXT: add
; CHECK_COUNT4-NEXT: icmp
;///////////////////// TEST 2 //////////////////////////////
; This test shows that with optnone attribute, the loop is not unrolled
; even if an unroll factor was specified.
define void @Test2() nounwind optnone noinline {
entry:
br label %loop
loop:
%iv = phi i32 [ 0, %entry ], [ %inc, %loop ]
%inc = add i32 %iv, 1
%exitcnd = icmp uge i32 %inc, 1024
br i1 %exitcnd, label %exit, label %loop
exit:
ret void
}
; CHECK_COUNT4-LABEL: @Test2
; CHECK_COUNT4: phi
; CHECK_COUNT4-NEXT: add
; CHECK_COUNT4-NEXT: icmp
;///////////////////// TEST 3 //////////////////////////////
; This test shows that this loop is fully unrolled by default.
@tab = common global [24 x i32] zeroinitializer, align 4
define i32 @Test3() {
entry:
br label %for.body
for.body: ; preds = %for.body, %entry
%i.05 = phi i32 [ 0, %entry ], [ %inc, %for.body ]
%arrayidx = getelementptr inbounds [24 x i32], [24 x i32]* @tab, i32 0, i32 %i.05
store i32 %i.05, i32* %arrayidx, align 4
%inc = add nuw nsw i32 %i.05, 1
%exitcond = icmp eq i32 %inc, 24
br i1 %exitcond, label %for.end, label %for.body
for.end: ; preds = %for.body
ret i32 42
}
; CHECK_NOCOUNT-LABEL: @Test3
; CHECK_NOCOUNT: store
; CHECK_NOCOUNT-NEXT: store
; CHECK_NOCOUNT-NEXT: store
; CHECK_NOCOUNT-NEXT: store
; CHECK_NOCOUNT-NEXT: store
; CHECK_NOCOUNT-NEXT: store
; CHECK_NOCOUNT-NEXT: store
; CHECK_NOCOUNT-NEXT: store
; CHECK_NOCOUNT-NEXT: store
; CHECK_NOCOUNT-NEXT: store
; CHECK_NOCOUNT-NEXT: store
; CHECK_NOCOUNT-NEXT: store
; CHECK_NOCOUNT-NEXT: store
; CHECK_NOCOUNT-NEXT: store
; CHECK_NOCOUNT-NEXT: store
; CHECK_NOCOUNT-NEXT: store
; CHECK_NOCOUNT-NEXT: store
; CHECK_NOCOUNT-NEXT: store
; CHECK_NOCOUNT-NEXT: store
; CHECK_NOCOUNT-NEXT: store
; CHECK_NOCOUNT-NEXT: store
; CHECK_NOCOUNT-NEXT: store
; CHECK_NOCOUNT-NEXT: store
; CHECK_NOCOUNT-NEXT: store
; CHECK_NOCOUNT-NEXT: ret
;///////////////////// TEST 4 //////////////////////////////
; This test shows that with optsize attribute, this loop is not unrolled.
define i32 @Test4() optsize {
entry:
br label %for.body
for.body: ; preds = %for.body, %entry
%i.05 = phi i32 [ 0, %entry ], [ %inc, %for.body ]
%arrayidx = getelementptr inbounds [24 x i32], [24 x i32]* @tab, i32 0, i32 %i.05
store i32 %i.05, i32* %arrayidx, align 4
%inc = add nuw nsw i32 %i.05, 1
%exitcond = icmp eq i32 %inc, 24
br i1 %exitcond, label %for.end, label %for.body
for.end: ; preds = %for.body
ret i32 42
}
; CHECK_NOCOUNT-LABEL: @Test4
; CHECK_NOCOUNT: phi
; CHECK_NOCOUNT: icmp
|
