[all-commits] [llvm/llvm-project] 9a9b8b: [AArch64] Allow unrolling of scalar epilogue loops...

[John Brawn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 9a9b8b7d1c3e38db00d137518ee52a2d1c0c7c1c
      https://github.com/llvm/llvm-project/commit/9a9b8b7d1c3e38db00d137518ee52a2d1c0c7c1c
  Author: John Brawn <john.brawn at arm.com>
  Date:   2025-07-31 (Thu, 31 Jul 2025)

  Changed paths:
    M llvm/lib/Target/AArch64/AArch64TargetTransformInfo.cpp
    M llvm/test/Transforms/LoopUnroll/AArch64/vector.ll

  Log Message:
  -----------
  [AArch64] Allow unrolling of scalar epilogue loops (#151164)

#147420 changed the unrolling preferences to permit unrolling of
non-auto vectorized loops by checking for the isvectorized attribute,
however when a loop is vectorized this attribute is put on both the
vector loop and the scalar epilogue, so this change prevented the scalar
epilogue from being unrolled.

Restore the previous behaviour of unrolling the scalar epilogue by
checking both for the isvectorized attribute and vector instructions in
the loop.



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