[all-commits] [llvm/llvm-project] b765fd: [SLP]Try to keep scalars, used in phi nodes, if ph...

[Alexey Bataev via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: b765fdd997be9ff0afb6de87077cd53d5f3d349c
      https://github.com/llvm/llvm-project/commit/b765fdd997be9ff0afb6de87077cd53d5f3d349c
  Author: Alexey Bataev <a.bataev at outlook.com>
  Date:   2024-08-21 (Wed, 21 Aug 2024)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
    M llvm/test/Transforms/SLPVectorizer/X86/phi.ll

  Log Message:
  -----------
  [SLP]Try to keep scalars, used in phi nodes, if phi nodes from same block are vectorized.

Before doing the vectorization of the PHI nodes, the compiler sorts them
by the opcodes of the operands. If the scalar is replaced during the
vectorization by extractelement, it breaks this sorting and prevent some
further vectorization attempts. Patch tries to improve this by doing
extra analysis of the scalars and tries to keep them, if it is found that
this scalar is used in other (external) PHI node in the same block.

Reviewers: RKSimon

Reviewed By: RKSimon

Pull Request: https://github.com/llvm/llvm-project/pull/103923



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