From a9348dc7acc6f292425721c178311d7b0b5144b6 Mon Sep 17 00:00:00 2001
From: Devang Patel <dpatel@apple.com>
Date: Wed, 3 Sep 2008 00:10:56 +0000
Subject: Check iteration count.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55680 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Transforms/Scalar/LoopStrengthReduce.cpp | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'lib/Transforms/Scalar')

diff --git a/lib/Transforms/Scalar/LoopStrengthReduce.cpp b/lib/Transforms/Scalar/LoopStrengthReduce.cpp
index b2c5977..16b8dbb 100644
--- a/lib/Transforms/Scalar/LoopStrengthReduce.cpp
+++ b/lib/Transforms/Scalar/LoopStrengthReduce.cpp
@@ -1908,6 +1908,10 @@ BinaryOperator *getNewPHIIncrement(BinaryOperator *Incr, PHINode *PHI,
 /// change the type of IV, if possible.
 void LoopStrengthReduce::OptimizeIVType(Loop *L) {
 
+  SCEVHandle IterationCount = SE->getIterationCount(L);
+  if (isa<SCEVCouldNotCompute>(IterationCount))
+    return;
+
   BasicBlock *LPH = L->getLoopPreheader();
   BasicBlock *LatchBB = L->getLoopLatch();
   SmallVector<PHINode *, 4> PHIs;
-- 
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