1 files changed, 52 insertions, 0 deletions
diff --git a/llvm/test/Transforms/LoopInterchange/outer-only-reductions.ll b/llvm/test/Transforms/LoopInterchange/outer-only-reductions.ll
new file mode 100644
index 00000000000..c58e7d3d272
--- /dev/null
+++ b/llvm/test/Transforms/LoopInterchange/outer-only-reductions.ll
@@ -0,0 +1,52 @@
+; RUN: opt < %s -basicaa -loop-interchange -pass-remarks-missed='loop-interchange' -pass-remarks-output=%t -S \
+; RUN:     -verify-dom-info -verify-loop-info -verify-loop-lcssa 2>&1 | FileCheck -check-prefix=IR %s
+; RUN: FileCheck --input-file=%t %s
+
+; Outer loop only reductions are not supported currently.
+
+@A = common global [500 x [500 x i32]] zeroinitializer
+
+;; global X
+
+;;  for( int i=1;i<N;i++) {
+;;    for( int j=1;j<N;j++)
+;;      ;
+;;    X+=A[j][i];
+;;  }
+
+; CHECK: --- !Missed
+; CHECK-NEXT: Pass:            loop-interchange
+; CHECK-NEXT: Name:            UnsupportedPHI
+; CHECK-NEXT: Function:        reduction_01
+
+; IR-LABEL: @reduction_01(
+; IR-NOT: split
+
+define i32 @reduction_01(i32 %N) {
+entry:
+  br label %outer.header
+
+outer.header:                                  ; preds = %for.cond1.for.inc6_crit_edge, %entry
+  %indvars.iv18 = phi i64 [ %indvars.iv.next19, %outer.inc ], [ 1, %entry ]
+  %add15 = phi i32 [ 0, %entry ], [ %add, %outer.inc ]
+  br label %for.body3
+
+for.body3:                                        ; preds = %for.body3, %for.body3.lr.ph
+  %indvars.iv = phi i64 [ 1, %outer.header ], [ %indvars.iv.next, %for.body3 ]
+  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
+  %lftr.wideiv = trunc i64 %indvars.iv.next to i32
+  %exitcond = icmp eq i32 %lftr.wideiv, %N
+  br i1 %exitcond, label %outer.inc, label %for.body3
+
+outer.inc:                     ; preds = %for.body3
+  %arrayidx5 = getelementptr inbounds [500 x [500 x i32]], [500 x [500 x i32]]* @A, i64 0, i64 %indvars.iv, i64 %indvars.iv18
+  %0 = load i32, i32* %arrayidx5
+  %add = add nsw i32 %add15, %0
+  %indvars.iv.next19 = add nuw nsw i64 %indvars.iv18, 1
+  %lftr.wideiv20 = trunc i64 %indvars.iv.next19 to i32
+  %exitcond21 = icmp eq i32 %lftr.wideiv20, %N
+  br i1 %exitcond21, label %for.end8, label %outer.header
+
+for.end8:                                         ; preds = %for.cond1.for.inc6_crit_edge, %entry
+  ret i32 %add
+}