1; RUN: opt < %s -basicaa -loop-interchange -S | FileCheck %s
2;; These are test that fail to interchange due to current limitation. This will go off once we extend the loop interchange pass.
3
4target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
5target triple = "x86_64-unknown-linux-gnu"
6
7@A = common global [100 x [100 x i32]] zeroinitializer
8@B = common global [100 x [100 x [100 x i32]]] zeroinitializer
9
10;;--------------------------------------Test case 01------------------------------------
11;; [FIXME] This loop though valid is currently not interchanged due to the limitation that we cannot split the inner loop latch due to multiple use of inner induction
12;; variable.(used to increment the loop counter and to access A[j+1][i+1]
13;;  for(int i=0;i<N-1;i++)
14;;    for(int j=1;j<N-1;j++)
15;;      A[j+1][i+1] = A[j+1][i+1] + k;
16
17define void @interchange_01(i32 %k, i32 %N) {
18 entry:
19   %sub = add nsw i32 %N, -1
20   %cmp26 = icmp sgt i32 %N, 1
21   br i1 %cmp26, label %for.cond1.preheader.lr.ph, label %for.end17
22
23 for.cond1.preheader.lr.ph:
24   %cmp324 = icmp sgt i32 %sub, 1
25   %0 = add i32 %N, -2
26   %1 = sext i32 %sub to i64
27   br label %for.cond1.preheader
28
29 for.cond.loopexit:
30   %cmp = icmp slt i64 %indvars.iv.next29, %1
31   br i1 %cmp, label %for.cond1.preheader, label %for.end17
32
33 for.cond1.preheader:
34   %indvars.iv28 = phi i64 [ 0, %for.cond1.preheader.lr.ph ], [ %indvars.iv.next29, %for.cond.loopexit ]
35   %indvars.iv.next29 = add nuw nsw i64 %indvars.iv28, 1
36   br i1 %cmp324, label %for.body4, label %for.cond.loopexit
37
38 for.body4:
39   %indvars.iv = phi i64 [ %indvars.iv.next, %for.body4 ], [ 1, %for.cond1.preheader ]
40   %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
41   %arrayidx7 = getelementptr inbounds [100 x [100 x i32]], [100 x [100 x i32]]* @A, i64 0, i64 %indvars.iv.next, i64 %indvars.iv.next29
42   %2 = load i32, i32* %arrayidx7
43   %add8 = add nsw i32 %2, %k
44   store i32 %add8, i32* %arrayidx7
45   %lftr.wideiv = trunc i64 %indvars.iv to i32
46   %exitcond = icmp eq i32 %lftr.wideiv, %0
47   br i1 %exitcond, label %for.cond.loopexit, label %for.body4
48
49 for.end17:
50   ret void
51}
52;; Inner loop not split so it is not interchanged.
53; CHECK-LABEL: @interchange_01
54; CHECK:      for.body4:
55; CHECK-NEXT:   %indvars.iv = phi i64 [ %indvars.iv.next, %for.body4 ], [ 1, %for.body4.preheader ]
56; CHECK-NEXT:   %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
57; CHECK-NEXT:   %arrayidx7 = getelementptr inbounds [100 x [100 x i32]], [100 x [100 x i32]]* @A, i64 0, i64 %indvars.iv.next, i64 %indvars.iv.next29
58
59