[all-commits] [llvm/llvm-project] 6afe5e: [LV][EVL] Peek through combination tail-folded + p...

[Luke Lau via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 6afe5e5d1a6dcbf7ba83acf4c57b964f58c364a1
      https://github.com/llvm/llvm-project/commit/6afe5e5d1a6dcbf7ba83acf4c57b964f58c364a1
  Author: Luke Lau <luke at igalia.com>
  Date:   2025-03-31 (Mon, 31 Mar 2025)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp
    M llvm/test/Transforms/LoopVectorize/RISCV/vectorize-force-tail-with-evl-cond-reduction.ll
    M llvm/test/Transforms/LoopVectorize/RISCV/vectorize-force-tail-with-evl-masked-loadstore.ll
    M llvm/test/Transforms/LoopVectorize/RISCV/vectorize-force-tail-with-evl-reverse-load-store.ll

  Log Message:
  -----------
  [LV][EVL] Peek through combination tail-folded + predicated masks (#133430)

If a recipe was predicated and tail folded at the same time, it will
have a mask like

    EMIT vp<%header-mask> = icmp ule canonical-iv, backedge-tc
    EMIT vp<%mask> = logical-and vp<%header-mask>, vp<%pred-mask>

When converting to an EVL recipe, if the mask isn't exactly just the
header-mask we copy the whole logical-and.
We can remove this redundant logical-and (because it's now covered by
EVL) and just use vp<%pred-mask> instead.

This lets us remove the widened canonical IV in more places.



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