commit a9348dc7acc6f292425721c178311d7b0b5144b6
author Devang Patel <dpatel@apple.com> Wed Sep 03 00:10:56 2008 +0000
committer Devang Patel <dpatel@apple.com> Wed Sep 03 00:10:56 2008 +0000
tree 37f6a290428ef0860c18a24cddbc61f79a350767
parent c3f44b0d636ff9a6d706ea9ac17ae77c8fa8aeff

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

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 @@
 /// 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;