[all-commits] [llvm/llvm-project] 712c21: [AArch64] Enable unrolling for small multi-exit lo...

[David Sherwood via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 712c21336fa891f5b32254dd51b024178d61befb
      https://github.com/llvm/llvm-project/commit/712c21336fa891f5b32254dd51b024178d61befb
  Author: David Sherwood <david.sherwood at arm.com>
  Date:   2025-04-09 (Wed, 09 Apr 2025)

  Changed paths:
    M llvm/lib/Target/AArch64/AArch64TargetTransformInfo.cpp
    M llvm/test/Transforms/LoopUnroll/AArch64/apple-unrolling-multi-exit.ll
    A llvm/test/Transforms/LoopUnroll/AArch64/unrolling-multi-exit.ll

  Log Message:
  -----------
  [AArch64] Enable unrolling for small multi-exit loops (#131998)

It can be highly beneficial to unroll small, two-block search loops
that look for a value in an array. An example of this would be
something that uses std::find to find a value in libc++. Older
versions of std::find in the libstdc++ headers are manually unrolled
in the source code, but this might change in newer releases where
the compiler is expected to either vectorise or unroll itself.



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