[all-commits] [llvm/llvm-project] f5ee07: [SLP]Improve instruction reordering mode detection.

[Alexey Bataev via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: f5ee07a1b5ca6f337e6b4a46558c315b8ccd29dc
      https://github.com/llvm/llvm-project/commit/f5ee07a1b5ca6f337e6b4a46558c315b8ccd29dc
  Author: Alexey Bataev <a.bataev at outlook.com>
  Date:   2024-07-08 (Mon, 08 Jul 2024)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
    M llvm/test/Transforms/SLPVectorizer/SystemZ/pr34619.ll
    M llvm/test/Transforms/SLPVectorizer/X86/reordering-single-phi.ll

  Log Message:
  -----------
  [SLP]Improve instruction reordering mode detection.

The "instruction" reordering mode should be selected only if there are
compatible instructions in other operands, which can be reordered.
Otherwise, better to select splat reordering mode.

Metric: size..text

Program                                                                                                                                                size..text
                                                                                                                                                       results     results0    diff

test-suite :: External/SPEC/CFP2017rate/526.blender_r/526.blender_r.test 12383340.00 12383324.00 -0.0%

Some 4x operations get replaced by 8x.

Reviewers: RKSimon

Reviewed By: RKSimon

Pull Request: https://github.com/llvm/llvm-project/pull/97485



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