[all-commits] [llvm/llvm-project] 4f8c96: [compiler-rt][AArch64][FMV] Use the hw.optional.ar...

[Jon Roelofs via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 4f8c961924c2e15eed54e5207111ceedc1da6568
      https://github.com/llvm/llvm-project/commit/4f8c961924c2e15eed54e5207111ceedc1da6568
  Author: Jon Roelofs <jonathan_roelofs at apple.com>
  Date:   2024-06-13 (Thu, 13 Jun 2024)

  Changed paths:
    M compiler-rt/lib/builtins/cpu_model/aarch64/fmv/apple.inc

  Log Message:
  -----------
  [compiler-rt][AArch64][FMV] Use the hw.optional.arm.caps fast path (#95275)

MacOS 15.0 and iOS 18.0 added a new sysctl to fetch a bitvector of all
the hw.optional.arm.FEAT_*'s in one go. Using this has a perf advantage
over doing multiple round-trips to the kernel and back, but since it's
not present in older oses, we still need the slow fallback.



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