From a932bae406dcddd6e4e39f8253ca721559a9dffb Mon Sep 17 00:00:00 2001
From: Dan Gohman <gohman@apple.com>
Date: Tue, 17 Aug 2010 17:39:21 +0000
Subject: When rotating loops, put the original header at the bottom of the
 loop, making the resulting loop significantly less ugly.  Also, zap its
 trivial PHI nodes, since it's easy.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@111255 91177308-0d34-0410-b5e6-96231b3b80d8
---
 test/Transforms/LoopRotate/phi-duplicate.ll | 22 +++++++++++++++++-----
 1 file changed, 17 insertions(+), 5 deletions(-)

(limited to 'test/Transforms')

diff --git a/test/Transforms/LoopRotate/phi-duplicate.ll b/test/Transforms/LoopRotate/phi-duplicate.ll
index 9a64e2a..5403e72 100644
--- a/test/Transforms/LoopRotate/phi-duplicate.ll
+++ b/test/Transforms/LoopRotate/phi-duplicate.ll
@@ -27,9 +27,21 @@ for.body:                                         ; preds = %for.cond
 for.end:                                          ; preds = %for.cond
   ret void
 }
-; Should only end up with one phi.
-; CHECK: for.body:
-; CHECK-NEXT: %j.02 = phi i64
-; CHECK-NOT: phi
-; CHECK: ret void
 
+; Should only end up with one phi. Also, the original for.cond block should
+; be moved to the end of the loop so that the new loop header pleasantly
+; ends up at the top.
+
+; CHECK:      define void @test
+; CHECK-NEXT: entry:
+; CHECK-NEXT:   icmp slt i64
+; CHECK-NEXT:   br i1
+; CHECK-NOT:  :
+; CHECK:      bb.nph:
+; CHECK-NEXT:   br label %for.body
+; CHECK-NOT:  :
+; CHECK:      for.body:
+; CHECK-NEXT:   %j.02 = phi i64
+; CHECK-NOT:    phi
+; CHECK:        ret void
+; CHECK-NEXT: }
-- 
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