[all-commits] [llvm/llvm-project] f70150: [SLP]Improve vectorization of phi nodes by trying ...

[cilkplus via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: f701505c45c708338202532f0f14af55b5509794
      https://github.com/llvm/llvm-project/commit/f701505c45c708338202532f0f14af55b5509794
  Author: Alexey Bataev <a.bataev at outlook.com>
  Date:   2021-09-28 (Tue, 28 Sep 2021)

  Changed paths:
    M llvm/include/llvm/Transforms/Vectorize/SLPVectorizer.h
    M llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
    M llvm/test/Transforms/SLPVectorizer/X86/vectorize-widest-phis.ll

  Log Message:
  -----------
  [SLP]Improve vectorization of phi nodes by trying wider vectors.

Try to improve vectorization of the PHI nodes by trying to vectorize
similar instructions at the size of the widest possible vectors, then
aggregating with compatible type PHIs and trying to vectoriza again and
only if this failed, try smaller sizes of the vector factors for
compatible PHI nodes. This restores performance of several benchmarks
after tuning of the fp/int conversion instructions costs.

Differential Revision: https://reviews.llvm.org/D108740