[PATCH] D146199: [LoopVectorize] Don't tail-fold for scalable VFs when there is no scalar tail

[Alexey Bataev via Phabricator via llvm-commits]

ABataev added inline comments.


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Comment at: llvm/lib/Transforms/Vectorize/LoopVectorize.cpp:5161
+  // we choose.
+  std::optional<unsigned> MaxPowerOf2RuntimeVF =
+      MaxFactors.FixedVF.getFixedValue();
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Looks like this std::optional does not work here, because MaxFactors.FixedVF.getFixedValue() returns non_optional value. So it may crash in the assert in line 5174, if MaxFactors.FixedVF.getFixedValue() returns 0 and MaxFactors.ScalableVF is not set.


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  https://reviews.llvm.org/D146199/new/

https://reviews.llvm.org/D146199