[PATCH] D148855: [SLP]Improve tryToGatherExtractElements by using per-register analysis.

[Alexey Bataev via Phabricator via llvm-commits]

ABataev created this revision.
ABataev added reviewers: RKSimon, vdmitrie, dmgreen.
Herald added subscribers: vporpo, hiraditya.
Herald added a project: All.
ABataev requested review of this revision.
Herald added a subscriber: pcwang-thead.
Herald added a project: LLVM.

Currently tryToGatherExtractElements function analyzes the whole vector,
regrdless number of actual registers, used in this vector. It may
prevent some optimizations, because per-register analysis may allow to
simplify the final code by reusing more already emitted vectors and
better shuffles.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D148855

Files:
  llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
  llvm/test/Transforms/SLPVectorizer/AArch64/extractelements-to-shuffle.ll
  llvm/test/Transforms/SLPVectorizer/X86/PR35865-inseltpoison.ll
  llvm/test/Transforms/SLPVectorizer/X86/PR35865.ll
  llvm/test/Transforms/SLPVectorizer/X86/hadd-inseltpoison.ll
  llvm/test/Transforms/SLPVectorizer/X86/hadd.ll
  llvm/test/Transforms/SLPVectorizer/X86/hsub-inseltpoison.ll
  llvm/test/Transforms/SLPVectorizer/X86/hsub.ll
  llvm/test/Transforms/SLPVectorizer/X86/reduction-transpose.ll

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