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[SCEV] Fix one more caller blindly passing the latch to SCEV's

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getSmallConstantTripCount even when it isn't the exiting block.

I missed this in my first audit, very sorry. This was found in LNT and
elsewhere. I don't have a test case, but it was completely obvious from
inspection that this was the problem. I'll see if I can reduce a test
case, but I'm not really hopeful, and the value seems quite low.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@219562 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chandler Carruth 2014-10-11 05:28:30 +00:00
parent fade9f1d17
commit 0b0126955a
1 changed files with 1 additions and 2 deletions
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3
lib/Transforms/Vectorize/LoopVectorize.cpp
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@ -5517,8 +5517,7 @@ LoopVectorizationCostModel::selectUnrollFactor(bool OptForSize,
return 1;
// Do not unroll loops with a relatively small trip count.
unsigned TC = SE->getSmallConstantTripCount(TheLoop,
TheLoop->getLoopLatch());
unsigned TC = SE->getSmallConstantTripCount(TheLoop);
if (TC > 1 && TC < TinyTripCountUnrollThreshold)
return 1;