[all-commits] [llvm/llvm-project] 871ea6: [SLP]Do not emit extra shuffle for insertelements ...

[cilkplus via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 871ea69803b1f231254ab0c560795a33b6ed0c77
      https://github.com/llvm/llvm-project/commit/871ea69803b1f231254ab0c560795a33b6ed0c77
  Author: Alexey Bataev <a.bataev at outlook.com>
  Date:   2021-08-03 (Tue, 03 Aug 2021)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
    M llvm/test/Transforms/SLPVectorizer/AArch64/vectorize-free-extracts-inserts.ll
    M llvm/test/Transforms/SLPVectorizer/X86/arith-fp-inseltpoison.ll
    M llvm/test/Transforms/SLPVectorizer/X86/arith-fp.ll
    M llvm/test/Transforms/SLPVectorizer/X86/insert-element-build-vector-inseltpoison.ll
    M llvm/test/Transforms/SLPVectorizer/X86/insert-element-build-vector.ll
    M llvm/test/Transforms/SLPVectorizer/X86/load-merge-inseltpoison.ll
    M llvm/test/Transforms/SLPVectorizer/X86/load-merge.ll
    M llvm/test/Transforms/SLPVectorizer/X86/sitofp-inseltpoison.ll
    M llvm/test/Transforms/SLPVectorizer/X86/sitofp.ll
    M llvm/test/Transforms/SLPVectorizer/X86/value-bug-inseltpoison.ll

  Log Message:
  -----------
  [SLP]Do not emit extra shuffle for insertelements vectorization.

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.

Differential Revision: https://reviews.llvm.org/D107344