[all-commits] [llvm/llvm-project] 041d18: [RISCV][TTI] Adjust costing in getPartialReduction...

[Philip Reames via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 041d189f01f5c4587470441d840f7ad00ba5f4bf
      https://github.com/llvm/llvm-project/commit/041d189f01f5c4587470441d840f7ad00ba5f4bf
  Author: Philip Reames <preames at rivosinc.com>
  Date:   2025-05-26 (Mon, 26 May 2025)

  Changed paths:
    M llvm/lib/Target/RISCV/RISCVTargetTransformInfo.cpp
    M llvm/test/Transforms/LoopVectorize/RISCV/partial-reduce-dot-product.ll

  Log Message:
  -----------
  [RISCV][TTI] Adjust costing in getPartialReductionCost for zvqdotq (#141430)

Two changes:

1) Handle fixed vector cases now that 77a3f8 has landed. 
2) Fix a mistake in the original costing - the VF passed in is the
   input VF, not the output VF.  Given that we should be costing the
   accumulator type with VF/4.

Note that (2) does not cause any visible test differences as the
vectorizer (outside of maximize-bandwidth mode) does not consider wide
enough VF for the costing difference to matter.



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