[PATCH] D34373: [LV] Optimize for size when vectorizing loops with tiny trip count

[Ayal Zaks via Phabricator via llvm-commits]

Ayal updated this revision to Diff 104453.
Ayal added a comment.

Updated version includes the comment requested by @hfinkel.

@mkuper, this is somewhat related to https://reviews.llvm.org/D26873; it conceptually allows vectorizing loops with low dynamic trip-counts that are also known to be divisible by VF statically; but current computeMaxVF() allows vectorizing loops under OptForSize only if their trip count is known statically, and known to be divisible by VF.


https://reviews.llvm.org/D34373

Files:
  lib/Transforms/Vectorize/LoopVectorize.cpp
  test/Transforms/LoopVectorize/X86/vect.omp.force.small-tc.ll
  test/Transforms/LoopVectorize/small-loop.ll

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