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

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

diff --git a/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp b/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
index ce03b85..ad3030c 100644 (file)
--- a/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
+++ b/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
@@ -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)