[PATCH] D154314: [LV] Prefer the tail fold according the the user hint

[Allen zhong via Phabricator via llvm-commits]

Allen created this revision.
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We check the loop trip count is known a power of 2 to determine
whether the tail loop can be eliminated in D146199 <https://reviews.llvm.org/D146199>.
However, the mask scalable loop can fold the tail loop for all
the trip count, so we don't need check that if the user specified
option -prefer-predicate-over-epilogue=predicate-else-scalar-epilogue.

      

Fix https://github.com/llvm/llvm-project/issues/63616.


https://reviews.llvm.org/D154314

Files:
  llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
  llvm/test/Transforms/LoopVectorize/AArch64/eliminate-tail-predication.ll
  llvm/test/Transforms/LoopVectorize/AArch64/sve-tail-folding.ll

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