[all-commits] [llvm/llvm-project] 74230f: [SLP]Improved/fixed FMAD support in reductions

[Alexey Bataev via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 74230ff2791384fb3285c9e9ab202056959aa095
      https://github.com/llvm/llvm-project/commit/74230ff2791384fb3285c9e9ab202056959aa095
  Author: Alexey Bataev <a.bataev at outlook.com>
  Date:   2025-09-01 (Mon, 01 Sep 2025)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
    M llvm/test/Transforms/SLPVectorizer/RISCV/vec3-base.ll
    M llvm/test/Transforms/SLPVectorizer/X86/redux-feed-buildvector.ll
    M llvm/test/Transforms/SLPVectorizer/X86/slp-fma-loss.ll

  Log Message:
  -----------
  [SLP]Improved/fixed FMAD support in reductions

In the initial patch for FMAD, potential FMAD nodes were completely
excluded from the reduction analysis for the smaller patch. But it may
cause regressions.

This patch adds better detection of scalar FMAD reduction operations and
tries to correctly calculate the costs of the FMAD reduction operations
(also, excluding the costs of the scalar fmuls) and split reduction
operations, combined with regular FMADs.

Reviewers: RKSimon, gregbedwell, hiraditya

Reviewed By: RKSimon

Pull Request: https://github.com/llvm/llvm-project/pull/152787



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