[all-commits] [llvm/llvm-project] e7c3ea: [SLP]Do not emit extra shuffle for insertelements ...

[cilkplus via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: e7c3eaa8aeba497bcd61adeeaafce5b99ff756a8
      https://github.com/llvm/llvm-project/commit/e7c3eaa8aeba497bcd61adeeaafce5b99ff756a8
  Author: Alexey Bataev <a.bataev at outlook.com>
  Date:   2021-08-05 (Thu, 05 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/D107494