[PATCH] D144689: [SLP]Improve handling gathers/buildvectors with undefs.

[Alexey Bataev via Phabricator via llvm-commits]

ABataev created this revision.
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If have just one non-undef scalar in the buildvector/gather node, we try
to put it to be the very first element, which is profitable in most
cases. Do the preliminary estimation, if this more profitable during
graph rotation and do same for all elements, including extractelements.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D144689

Files:
  llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
  llvm/test/Transforms/SLPVectorizer/X86/landing_pad.ll
  llvm/test/Transforms/SLPVectorizer/X86/phi3.ll
  llvm/test/Transforms/SLPVectorizer/X86/pr35497.ll
  llvm/test/Transforms/SLPVectorizer/X86/remark_extract_broadcast.ll
  llvm/test/Transforms/SLPVectorizer/X86/vectorize-pair-path.ll

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