[all-commits] [llvm/llvm-project] b9aa15: [TTI][X86]Fix detection of the shuffles from the s...

[Alexey Bataev via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: b9aa155d26935c058449f4ac116201de000fd7bf
      https://github.com/llvm/llvm-project/commit/b9aa155d26935c058449f4ac116201de000fd7bf
  Author: Alexey Bataev <a.bataev at outlook.com>
  Date:   2024-12-06 (Fri, 06 Dec 2024)

  Changed paths:
    M llvm/lib/Analysis/VectorUtils.cpp
    M llvm/test/Analysis/CostModel/X86/shuffle-splat-codesize.ll
    M llvm/test/Analysis/CostModel/X86/shuffle-splat-latency.ll
    M llvm/test/Analysis/CostModel/X86/shuffle-splat-sizelatency.ll
    M llvm/test/Analysis/CostModel/X86/shuffle-splat.ll

  Log Message:
  -----------
  [TTI][X86]Fix detection of the shuffles from the second shuffle operand only

If the shuffle mask uses only indices from the second shuffle operand,
processShuffleMasks function misses it currently, which prevents correct
cost estimation in this corner case. To fix this, need to raise the
limit to 2 * VF rather than just VF and adjust processing
correspondingly. Will allow future improvements for 2 sources
permutations.

Reviewers: RKSimon

Reviewed By: RKSimon

Pull Request: https://github.com/llvm/llvm-project/pull/118972



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