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LoopVectorizationCostModel::selectInterleaveCount - assert we have a non-zero loop cost. NFCI.

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The input LoopCost value can be zero, but if so it should be recalculated with the current VF. After that it should always be non-zero.

llvm-svn: 361387
This commit is contained in:
Simon Pilgrim 2019-05-22 14:18:17 +00:00
parent 7773fc478d
commit 3c05cad03e
1 changed files with 2 additions and 0 deletions
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llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
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@ -5001,6 +5001,8 @@ unsigned LoopVectorizationCostModel::selectInterleaveCount(bool OptForSize,
if (LoopCost == 0)
LoopCost = expectedCost(VF).first;
assert(LoopCost && "Non-zero loop cost expected");
// Clamp the calculated IC to be between the 1 and the max interleave count
// that the target allows.
if (IC > MaxInterleaveCount)