[PATCH] D107344: [SLP]Do not emit extra shuffle for insertelements vectorization.

[Alexey Bataev via Phabricator via llvm-commits]

ABataev created this revision.
ABataev added reviewers: RKSimon, spatel, anton-afanasyev, dtemirbulatov.
Herald added a subscriber: hiraditya.
ABataev requested review of this revision.
Herald added a project: LLVM.

If the vectorized insertelements instructions form indentity subvector
(the subvector at the beginning of the long vector), it is just enough
to extend the vector itself, no need to generate inserting subvector
shuffle.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D107344

Files:
  llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
  llvm/test/Transforms/SLPVectorizer/AArch64/vectorize-free-extracts-inserts.ll
  llvm/test/Transforms/SLPVectorizer/X86/arith-fp-inseltpoison.ll
  llvm/test/Transforms/SLPVectorizer/X86/arith-fp.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/load-merge-inseltpoison.ll
  llvm/test/Transforms/SLPVectorizer/X86/load-merge.ll
  llvm/test/Transforms/SLPVectorizer/X86/sitofp-inseltpoison.ll
  llvm/test/Transforms/SLPVectorizer/X86/sitofp.ll
  llvm/test/Transforms/SLPVectorizer/X86/value-bug-inseltpoison.ll

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