1; REQUIRES: asserts
2; RUN: opt < %s -basicaa -loop-interchange -verify-dom-info -verify-loop-info \
3; RUN:     -S -debug 2>&1 | FileCheck %s
4
5target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
6target triple = "x86_64-unknown-linux-gnu"
7
8@A = common global [100 x [100 x i32]] zeroinitializer
9@B = common global [100 x i32] zeroinitializer
10@C = common global [100 x [100 x i32]] zeroinitializer
11@D = common global [100 x [100 x [100 x i32]]] zeroinitializer
12
13;; Test that a flow dependency in outer loop doesn't prevent interchange in
14;; loops i and j.
15;;
16;;  for (int k = 0; k < 100; ++k) {
17;;    T[k] = fn1();
18;;    for (int i = 0; i < 1000; ++i)
19;;      for(int j = 1; j < 1000; ++j)
20;;        Arr[j][i] = Arr[j][i]+k;
21;;    fn2(T[k]);
22;;  }
23
24; CHECK: Processing Inner Loop Id = 2 and OuterLoopId = 1
25; CHECK: Loops interchanged.
26
27; CHECK: Processing Inner Loop Id = 1 and OuterLoopId = 0
28; CHECK: Not interchanging loops. Cannot prove legality.
29
30@T = internal global [100 x double] zeroinitializer, align 4
31@Arr = internal global [1000 x [1000 x i32]] zeroinitializer, align 4
32
33define void @interchange_09(i32 %k) {
34entry:
35  br label %for.body
36
37for.cond.cleanup:                                 ; preds = %for.cond.cleanup4
38  ret void
39
40for.body:                                         ; preds = %for.cond.cleanup4, %entry
41  %indvars.iv45 = phi i64 [ 0, %entry ], [ %indvars.iv.next46, %for.cond.cleanup4 ]
42  %call = call double @fn1()
43  %arrayidx = getelementptr inbounds [100 x double], [100 x double]* @T, i64 0, i64 %indvars.iv45
44  store double %call, double* %arrayidx, align 8
45  br label %for.cond6.preheader
46
47for.cond6.preheader:                              ; preds = %for.cond.cleanup8, %for.body
48  %indvars.iv42 = phi i64 [ 0, %for.body ], [ %indvars.iv.next43, %for.cond.cleanup8 ]
49  br label %for.body9
50
51for.cond.cleanup4:                                ; preds = %for.cond.cleanup8
52  %tmp = load double, double* %arrayidx, align 8
53  call void @fn2(double %tmp)
54  %indvars.iv.next46 = add nuw nsw i64 %indvars.iv45, 1
55  %exitcond47 = icmp ne i64 %indvars.iv.next46, 100
56  br i1 %exitcond47, label %for.body, label %for.cond.cleanup
57
58for.cond.cleanup8:                                ; preds = %for.body9
59  %indvars.iv.next43 = add nuw nsw i64 %indvars.iv42, 1
60  %exitcond44 = icmp ne i64 %indvars.iv.next43, 1000
61  br i1 %exitcond44, label %for.cond6.preheader, label %for.cond.cleanup4
62
63for.body9:                                        ; preds = %for.body9, %for.cond6.preheader
64  %indvars.iv = phi i64 [ 1, %for.cond6.preheader ], [ %indvars.iv.next, %for.body9 ]
65  %arrayidx13 = getelementptr inbounds [1000 x [1000 x i32]], [1000 x [1000 x i32]]* @Arr, i64 0, i64 %indvars.iv, i64 %indvars.iv42
66  %tmp1 = load i32, i32* %arrayidx13, align 4
67  %tmp2 = trunc i64 %indvars.iv45 to i32
68  %add = add nsw i32 %tmp1, %tmp2
69  store i32 %add, i32* %arrayidx13, align 4
70  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
71  %exitcond = icmp ne i64 %indvars.iv.next, 1000
72  br i1 %exitcond, label %for.body9, label %for.cond.cleanup8
73}
74
75declare double @fn1() readnone
76declare void @fn2(double) readnone
77