[all-commits] [llvm/llvm-project] 4d3148: [LV][EVL] Fix the check for legality of folding wi...

[Mel Chen via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 4d3148d92681c154de51379a0cf393f9af8e1d75
      https://github.com/llvm/llvm-project/commit/4d3148d92681c154de51379a0cf393f9af8e1d75
  Author: Mel Chen <mel.chen at sifive.com>
  Date:   2025-02-07 (Fri, 07 Feb 2025)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
    M llvm/test/Transforms/LoopVectorize/RISCV/vectorize-force-tail-with-evl-inloop-reduction.ll
    M llvm/test/Transforms/LoopVectorize/RISCV/vectorize-force-tail-with-evl-reduction.ll

  Log Message:
  -----------
  [LV][EVL] Fix the check for legality of folding with EVL. (#125678)

The current legality check for folding with EVL has incomplete
verification for VF.
This patch fixes the VF check, ensuring that tail folding with EVL is
enabled only when a scalable VF is available. This allows loops that
prefer tail folding with EVL but cannot use scalable VF vectorization to
still be vectorized using a fixed VF, rather than abandoning
vectorization entirely.



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