[all-commits] [llvm/llvm-project] de1c2f: [LoopVectorizer][AArch64] Move getMinTripCountTail...

[David Green via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: de1c2f24bc1991beed8314ee5922f5768391537e
      https://github.com/llvm/llvm-project/commit/de1c2f24bc1991beed8314ee5922f5768391537e
  Author: David Green <david.green at arm.com>
  Date:   2025-03-26 (Wed, 26 Mar 2025)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
    M llvm/test/Transforms/LoopVectorize/AArch64/low_trip_count_predicates.ll

  Log Message:
  -----------
  [LoopVectorizer][AArch64] Move getMinTripCountTailFoldingThreshold later. (#132170)

This moves the checks of MinTripCountTailFoldingThreshold later, during the
calculation of whether to tail fold. This allows it to check beforehand whether
tail predication is required, either for scalable or fixed-width vectors.

This option is only specified for AArch64, where it returns the minimum of 5.
This patch aims to allow the vectorization of TC=4 loops, preventing them from
performing slower when SVE is present.



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