[PATCH] D147976: [LSV] Improve chain splitting in some corner cases.

[Artem Belevich via Phabricator via llvm-commits]

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Currently we happen to split a chain of 12xi8 accesses into 6xi8 + 6xi8, which
produces rather suboptimal code.

This change attempts to split-off non-multiples of 4bytes at the end and if that
does not work, splits on the smaller power-of-2 boundary.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D147976

Files:
  llvm/lib/Transforms/Vectorize/LoadStoreVectorizer.cpp
  llvm/test/Transforms/LoadStoreVectorizer/NVPTX/vectorize_i8.ll

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