[PATCH] D141940: [SLP]Add shuffling of extractelements to avoid extra costs/data movement.

[Alexey Bataev via Phabricator via llvm-commits]

ABataev created this revision.
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If the scalar must be extracted and then used in the gather node,
instead we can emit shuffle instruction to avoid those extra
extractelements and vector-to-scalar and back data movement.

Part of D110978 <https://reviews.llvm.org/D110978>


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D141940

Files:
  llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
  llvm/test/Transforms/SLPVectorizer/AArch64/gather-cost.ll
  llvm/test/Transforms/SLPVectorizer/AArch64/horizontal.ll
  llvm/test/Transforms/SLPVectorizer/X86/PR39774.ll
  llvm/test/Transforms/SLPVectorizer/X86/blending-shuffle-inseltpoison.ll
  llvm/test/Transforms/SLPVectorizer/X86/blending-shuffle.ll
  llvm/test/Transforms/SLPVectorizer/X86/commutativity.ll
  llvm/test/Transforms/SLPVectorizer/X86/crash_netbsd_decompress.ll
  llvm/test/Transforms/SLPVectorizer/X86/gather-extractelements-different-bbs.ll
  llvm/test/Transforms/SLPVectorizer/X86/insert-element-build-vector-inseltpoison.ll
  llvm/test/Transforms/SLPVectorizer/X86/insert-element-build-vector.ll
  llvm/test/Transforms/SLPVectorizer/X86/reduction-transpose.ll
  llvm/test/Transforms/SLPVectorizer/X86/remark_extract_broadcast.ll

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