[all-commits] [llvm/llvm-project] 15915c: [SLP]Do not vectorize small (<=2) buildvector/buil...

[Alexey Bataev via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 15915c06d54151b78378a7cd029e1a8c09e764b3
      https://github.com/llvm/llvm-project/commit/15915c06d54151b78378a7cd029e1a8c09e764b3
  Author: Alexey Bataev <a.bataev at outlook.com>
  Date:   2024-07-16 (Tue, 16 Jul 2024)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
    M llvm/test/Transforms/SLPVectorizer/AArch64/scalarization-overhead.ll
    M llvm/test/Transforms/SLPVectorizer/X86/reused-extractelements.ll

  Log Message:
  -----------
  [SLP]Do not vectorize small (<=2) buildvector/buildvalue sequences with MaxVF==true.

If MaxVFOnly for buildvector/buildvalue vectorization is set to true and the
total number of elements to vectorize is <= 2, better to try to
vectorize reductions at first, which may produce larger tree (reductions
have a limit of at least 4 elements to vectorize). Smaller
buildvector/buildvalue sequence will be attempted to vectorize later,
with MaxVFOnly set to false.

Reviewers: RKSimon

Reviewed By: RKSimon

Pull Request: https://github.com/llvm/llvm-project/pull/98957



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