[all-commits] [llvm/llvm-project] e78be3: [RISCV] Added cost model for fmuladd (#125683)

[Mikhail R. Gadelha via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: e78be316394509a665796a325603fe773346fbba
      https://github.com/llvm/llvm-project/commit/e78be316394509a665796a325603fe773346fbba
  Author: Mikhail R. Gadelha <mikhail at igalia.com>
  Date:   2025-02-05 (Wed, 05 Feb 2025)

  Changed paths:
    M llvm/lib/Target/RISCV/RISCVTargetTransformInfo.cpp
    M llvm/test/Analysis/CostModel/RISCV/arith-fp.ll
    M llvm/test/Transforms/LoopVectorize/RISCV/bf16.ll
    M llvm/test/Transforms/SLPVectorizer/RISCV/revec-getGatherCost.ll

  Log Message:
  -----------
  [RISCV] Added cost model for fmuladd (#125683)

This patch updates the cost model for fmuladd on vector types to scale with LMUL. This was found when analyzing a hot loop in 519.lbm_r that was unprofitably vectorized, but doesn't directly impact that case and is split off so it doesn't get forgotten.

Unlike other FP arithmetic ops, it's not scaled by 2 because the scalar cost isn't scaled by 2.



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