[all-commits] [llvm/llvm-project] 248be9: Reapply "[RISCV][TTI] Add shuffle costing for mask...

[Philip Reames via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 248be98418225fd409bc3ffb1834573c7890085e
      https://github.com/llvm/llvm-project/commit/248be98418225fd409bc3ffb1834573c7890085e
  Author: Philip Reames <preames at rivosinc.com>
  Date:   2025-02-28 (Fri, 28 Feb 2025)

  Changed paths:
    M llvm/include/llvm/Analysis/VectorUtils.h
    M llvm/lib/Analysis/VectorUtils.cpp
    M llvm/lib/Target/RISCV/RISCVISelLowering.cpp
    M llvm/lib/Target/RISCV/RISCVTargetTransformInfo.cpp
    M llvm/lib/Target/RISCV/RISCVTargetTransformInfo.h
    M llvm/test/Analysis/CostModel/RISCV/shuffle-exact-vlen.ll
    M llvm/test/Analysis/CostModel/RISCV/shuffle-extract_subvector.ll
    M llvm/test/Analysis/CostModel/RISCV/shuffle-transpose.ll
    M llvm/test/Transforms/SLPVectorizer/RISCV/complex-loads.ll
    M llvm/test/Transforms/SLPVectorizer/RISCV/reductions.ll

  Log Message:
  -----------
  Reapply "[RISCV][TTI] Add shuffle costing for masked slide lowering (#128537)"

With a fix for fully undef masks.  These can't reach the lowering code, but
can reach the costing code via e.g. SLP.

This change adds the TTI costing corresponding to the recently added
isMaskedSlidePair lowering for vector shuffles. However, since the
existing costing code hadn't covered either slideup, slidedown, or the
(now removed) isElementRotate, the impact is larger in scope than just
that new lowering.

---------

Co-authored-by: Alexey Bataev <a.bataev at gmx.com>
Co-authored-by: Luke Lau <luke_lau at icloud.com>



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