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
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
|
; RUN: opt < %s -basicaa -loop-interchange -verify-dom-info -S | FileCheck %s
;; We test the complete .ll for adjustment in outer loop header/latch and inner loop header/latch.
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
@A = common global [100 x [100 x i32]] zeroinitializer
declare void @foo(i64 %a)
declare void @bar(i64 %a) readnone
;;--------------------------------------Test case 01------------------------------------
;; Not safe to interchange, because the called function `foo` is not marked as
;; readnone, so it could introduce dependences.
;;
;; for(int i=0;i<N;i++) {
;; for(int j=1;j<N;j++) {
;; foo(i);
;; A[j][i] = A[j][i]+k;
;; }
;; }
define void @interchange_01(i32 %k, i32 %N) {
entry:
%cmp21 = icmp sgt i32 %N, 0
br i1 %cmp21, label %for1.ph, label %exit
for1.ph:
%cmp219 = icmp sgt i32 %N, 1
%0 = add i32 %N, -1
br label %for1.header
for1.header:
%indvars.iv23 = phi i64 [ 0, %for1.ph ], [ %indvars.iv.next24, %for1.inc10 ]
br i1 %cmp219, label %for2.ph, label %for1.inc10
for2.ph:
br label %for2
for2:
%indvars.iv = phi i64 [ %indvars.iv.next, %for2 ], [ 1, %for2.ph ]
call void @foo(i64 %indvars.iv23)
%arrayidx5 = getelementptr inbounds [100 x [100 x i32]], [100 x [100 x i32]]* @A, i64 0, i64 %indvars.iv, i64 %indvars.iv23
%1 = load i32, i32* %arrayidx5
%add = add nsw i32 %1, %k
store i32 %add, i32* %arrayidx5
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
%lftr.wideiv = trunc i64 %indvars.iv to i32
%exitcond = icmp eq i32 %lftr.wideiv, %0
br i1 %exitcond, label %for2.loopexit , label %for2
for2.loopexit:
br label %for1.inc10
for1.inc10:
%indvars.iv.next24 = add nuw nsw i64 %indvars.iv23, 1
%lftr.wideiv25 = trunc i64 %indvars.iv23 to i32
%exitcond26 = icmp eq i32 %lftr.wideiv25, %0
br i1 %exitcond26, label %for1.loopexit, label %for1.header
for1.loopexit:
br label %exit
exit:
ret void
}
; CHECK-LABEL: @interchange_01
; CHECK: for1.ph:
; CHECK: br label %for1.header
; CHECK: for1.header:
; CHECK-NEXT: %indvars.iv23 = phi i64 [ 0, %for1.ph ], [ %indvars.iv.next24, %for1.inc10 ]
; CHECK-NEXT: br i1 %cmp219, label %for2.ph, label %for1.inc10
; CHECK: for2:
; CHECK: br i1 %exitcond, label %for2.loopexit, label %for2
; CHECK: for1.inc10:
; CHECK: br i1 %exitcond26, label %for1.loopexit, label %for1.header
; CHECK: for1.loopexit:
; CHECK-NEXT: br label %exit
;;--------------------------------------Test case 02------------------------------------
;; Safe to interchange, because the called function `bar` is marked as readnone,
;; so it cannot introduce dependences.
;;
;; for(int i=0;i<N;i++) {
;; for(int j=1;j<N;j++) {
;; bar(i);
;; A[j][i] = A[j][i]+k;
;; }
;; }
define void @interchange_02(i32 %k, i32 %N) {
entry:
%cmp21 = icmp sgt i32 %N, 0
br i1 %cmp21, label %for1.ph, label %exit
for1.ph:
%cmp219 = icmp sgt i32 %N, 1
%0 = add i32 %N, -1
br label %for1.header
for1.header:
%indvars.iv23 = phi i64 [ 0, %for1.ph ], [ %indvars.iv.next24, %for1.inc10 ]
br i1 %cmp219, label %for2.ph, label %for1.inc10
for2.ph:
br label %for2
for2:
%indvars.iv = phi i64 [ %indvars.iv.next, %for2 ], [ 1, %for2.ph ]
call void @bar(i64 %indvars.iv23)
%arrayidx5 = getelementptr inbounds [100 x [100 x i32]], [100 x [100 x i32]]* @A, i64 0, i64 %indvars.iv, i64 %indvars.iv23
%1 = load i32, i32* %arrayidx5
%add = add nsw i32 %1, %k
store i32 %add, i32* %arrayidx5
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
%lftr.wideiv = trunc i64 %indvars.iv to i32
%exitcond = icmp eq i32 %lftr.wideiv, %0
br i1 %exitcond, label %for2.loopexit , label %for2
for2.loopexit:
br label %for1.inc10
for1.inc10:
%indvars.iv.next24 = add nuw nsw i64 %indvars.iv23, 1
%lftr.wideiv25 = trunc i64 %indvars.iv23 to i32
%exitcond26 = icmp eq i32 %lftr.wideiv25, %0
br i1 %exitcond26, label %for1.loopexit, label %for1.header
for1.loopexit:
br label %exit
exit:
ret void
}
; CHECK-LABEL: @interchange_02
; CHECK: for1.header:
; CHECK-NEXT: %indvars.iv23 = phi i64 [ 0, %for1.ph ], [ %indvars.iv.next24, %for1.inc10 ]
; CHECK-NEXT: br i1 %cmp219, label %for2.split1, label %for1.loopexit
; CHECK: for2.split1:
; CHECK: br label %for2.loopexit
; CHECK: for2.split:
; CHECK-NEXT: %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
; CHECK: br i1 %exitcond, label %for1.loopexit, label %for2
; CHECK: for2.loopexit:
; CHECK-NEXT: br label %for1.inc10
; CHECK: for1.inc10:
; CHECK: br i1 %exitcond26, label %for2.split, label %for1.header
|
