1; REQUIRES: asserts
2; RUN: opt < %s -basic-aa -loop-interchange -cache-line-size=64 -pass-remarks-missed='loop-interchange' -pass-remarks-output=%t -S \
3; RUN:     -verify-dom-info -verify-loop-info -stats 2>&1 | FileCheck -check-prefix=STATS %s
4; RUN: FileCheck --input-file=%t %s
5
6target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
7
8@A = common global [100 x [100 x i32]] zeroinitializer
9
10declare void @foo(i64 %a)
11declare void @bar(i64 %a) readnone
12
13;;--------------------------------------Test case 01------------------------------------
14;; Not safe to interchange, because the called function `foo` is not marked as
15;; readnone, so it could introduce dependences.
16;;
17;;  for(int i=0;i<100;i++) {
18;;    for(int j=1;j<100;j++) {
19;;      foo(i);
20;;      A[j][i] = A[j][i]+k;
21;;    }
22;; }
23
24; CHECK: --- !Missed
25; CHECK-NEXT: Pass:            loop-interchange
26; CHECK-NEXT: Name:            CallInst
27; CHECK-NEXT: Function:        interchange_01
28; CHECK-NEXT: Args:
29; CHECK-NEXT: - String:          Cannot interchange loops due to call instruction.
30
31define void @interchange_01(i32 %k) {
32entry:
33  br label %for1.header
34
35for1.header:
36  %indvars.iv23 = phi i64 [ 0, %entry ], [ %indvars.iv.next24, %for1.inc10 ]
37  br label %for2
38
39for2:
40  %indvars.iv = phi i64 [ %indvars.iv.next, %for2 ], [ 1, %for1.header ]
41  call void @foo(i64 %indvars.iv23)
42  %arrayidx5 = getelementptr inbounds [100 x [100 x i32]], [100 x [100 x i32]]* @A, i64 0, i64 %indvars.iv, i64 %indvars.iv23
43  %lv = load i32, i32* %arrayidx5
44  %add = add nsw i32 %lv, %k
45  store i32 %add, i32* %arrayidx5
46  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
47  %exitcond = icmp eq i64 %indvars.iv, 99
48  br i1 %exitcond, label %for2.loopexit , label %for2
49
50for2.loopexit:
51  br label %for1.inc10
52
53for1.inc10:
54  %indvars.iv.next24 = add nuw nsw i64 %indvars.iv23, 1
55  %exitcond26 = icmp eq i64 %indvars.iv23, 99
56  br i1 %exitcond26, label %for1.loopexit, label %for1.header
57
58for1.loopexit:
59  br label %exit
60
61exit:
62  ret void
63}
64
65;;--------------------------------------Test case 02------------------------------------
66;; Safe to interchange, because the called function `bar` is marked as readnone,
67;; so it cannot introduce dependences.
68;;
69;;  for(int i=0;i<100;i++) {
70;;    for(int j=1;j<100;j++) {
71;;      bar(i);
72;;      A[j][i] = A[j][i]+k;
73;;    }
74;; }
75
76; CHECK: --- !Passed
77; CHECK-NEXT: Pass:            loop-interchange
78; CHECK-NEXT: Name:            Interchanged
79; CHECK-NEXT: Function:        interchange_02
80; CHECK-NEXT: Args:
81; CHECK-NEXT:   - String:          Loop interchanged with enclosing loop.
82; CHECK-NEXT: ...
83
84define void @interchange_02(i32 %k) {
85entry:
86  br label %for1.header
87
88for1.header:
89  %indvars.iv23 = phi i64 [ 0, %entry ], [ %indvars.iv.next24, %for1.inc10 ]
90  br label %for2
91
92for2:
93  %indvars.iv = phi i64 [ %indvars.iv.next, %for2 ], [ 1, %for1.header ]
94  call void @bar(i64 %indvars.iv23)
95  %arrayidx5 = getelementptr inbounds [100 x [100 x i32]], [100 x [100 x i32]]* @A, i64 0, i64 %indvars.iv, i64 %indvars.iv23
96  %lv = load i32, i32* %arrayidx5
97  %add = add nsw i32 %lv, %k
98  store i32 %add, i32* %arrayidx5
99  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
100  %exitcond = icmp eq i64 %indvars.iv, 99
101  br i1 %exitcond, label %for2.loopexit , label %for2
102
103for2.loopexit:
104  br label %for1.inc10
105
106for1.inc10:
107  %indvars.iv.next24 = add nuw nsw i64 %indvars.iv23, 1
108  %exitcond26 = icmp eq i64 %indvars.iv23, 99
109  br i1 %exitcond26, label %for1.loopexit, label %for1.header
110
111for1.loopexit:
112  br label %exit
113
114exit:
115  ret void
116}
117
118; Check stats, we interchanged 1 out of 2 loops.
119; STATS: 1 loop-interchange - Number of loops interchanged
120