[PATCH] D146958: [SCEV] Do not plant SCEV checks unnecessarily

[Paul Osmialowski via Phabricator via llvm-commits]

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The vectorisation analysis collects strides for loop invariant
pointers, which is wrong because they are not strided. We don't
need to generate SCEV checks (which are costly performancewise)
for such pointers, we just need to do the appropriate aliasing
checks.

This patch fixes the problem by simply ignoring loop invariant
pointers when collecting the strides.

Originally written by David Sherwood.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D146958

Files:
  llvm/lib/Analysis/LoopAccessAnalysis.cpp
  llvm/lib/Analysis/VectorUtils.cpp
  llvm/test/Transforms/LoopVectorize/vector-no-scevcheck.ll

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