[all-commits] [llvm/llvm-project] 0577cd: [LV] Split checking if tail-folding is possible, c...

[Florian Hahn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 0577cdaa32b26c02e16822343e7039b999f43d58
      https://github.com/llvm/llvm-project/commit/0577cdaa32b26c02e16822343e7039b999f43d58
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2024-07-08 (Mon, 08 Jul 2024)

  Changed paths:
    M llvm/include/llvm/Transforms/Vectorize/LoopVectorizationLegality.h
    M llvm/lib/Transforms/Vectorize/LoopVectorizationLegality.cpp
    M llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
    M llvm/test/Transforms/LoopVectorize/RISCV/vectorize-force-tail-with-evl-interleave.ll

  Log Message:
  -----------
  [LV] Split checking if tail-folding is possible, collecting masked ops. (#77612)

Introduce new canFoldTail helper which only checks if tail-folding is
possible, but without modifying MaskedOps.

Just because tail-folding is possible doesn't mean the tail will be
folded; that's up to the cost-model to decide. Separating the check if
tail-folding is possible and preparing for tail-folding makes sure that
MaskedOps is only populated when tail-folding is actually selected.

PR: https://github.com/llvm/llvm-project/pull/77612



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