1 files changed, 58 insertions, 0 deletions
diff --git a/test/Transforms/LoopInterchange/currentLimitation.ll b/test/Transforms/LoopInterchange/currentLimitation.ll
new file mode 100644
index 0000000..8045dd8
--- /dev/null
+++ b/test/Transforms/LoopInterchange/currentLimitation.ll
@@ -0,0 +1,58 @@
+; RUN: opt < %s -basicaa -loop-interchange -S | FileCheck %s
+;; These are test that fail to interchange due to current limitation. This will go off once we extend the loop interchange pass.
+
+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
+@B = common global [100 x [100 x [100 x i32]]] zeroinitializer
+ 
+;;--------------------------------------Test case 01------------------------------------
+;; [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
+;; variable.(used to increment the loop counter and to access A[j+1][i+1]
+;;  for(int i=0;i<N-1;i++)
+;;    for(int j=1;j<N-1;j++)
+;;      A[j+1][i+1] = A[j+1][i+1] + k;
+
+define void @interchange_01(i32 %k, i32 %N) {
+ entry:
+   %sub = add nsw i32 %N, -1
+   %cmp26 = icmp sgt i32 %N, 1
+   br i1 %cmp26, label %for.cond1.preheader.lr.ph, label %for.end17
+ 
+ for.cond1.preheader.lr.ph:
+   %cmp324 = icmp sgt i32 %sub, 1
+   %0 = add i32 %N, -2
+   %1 = sext i32 %sub to i64
+   br label %for.cond1.preheader
+ 
+ for.cond.loopexit:
+   %cmp = icmp slt i64 %indvars.iv.next29, %1
+   br i1 %cmp, label %for.cond1.preheader, label %for.end17
+ 
+ for.cond1.preheader:
+   %indvars.iv28 = phi i64 [ 0, %for.cond1.preheader.lr.ph ], [ %indvars.iv.next29, %for.cond.loopexit ]
+   %indvars.iv.next29 = add nuw nsw i64 %indvars.iv28, 1
+   br i1 %cmp324, label %for.body4, label %for.cond.loopexit
+ 
+ for.body4:
+   %indvars.iv = phi i64 [ %indvars.iv.next, %for.body4 ], [ 1, %for.cond1.preheader ]
+   %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
+   %arrayidx7 = getelementptr inbounds [100 x [100 x i32]], [100 x [100 x i32]]* @A, i64 0, i64 %indvars.iv.next, i64 %indvars.iv.next29
+   %2 = load i32, i32* %arrayidx7
+   %add8 = add nsw i32 %2, %k
+   store i32 %add8, i32* %arrayidx7
+   %lftr.wideiv = trunc i64 %indvars.iv to i32
+   %exitcond = icmp eq i32 %lftr.wideiv, %0
+   br i1 %exitcond, label %for.cond.loopexit, label %for.body4
+ 
+ for.end17: 
+   ret void
+}
+;; Inner loop not split so it is not interchanged.
+; CHECK-LABEL: @interchange_01
+; CHECK:      for.body4:
+; CHECK-NEXT:   %indvars.iv = phi i64 [ %indvars.iv.next, %for.body4 ], [ 1, %for.body4.preheader ]
+; CHECK-NEXT:   %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
+; 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
+