[all-commits] [llvm/llvm-project] b8f4f3: [libc] avoid cmpxchg on the fastpath of callonce (...

[Schrodinger ZHU Yifan via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: b8f4f39d3d43d348e31fc5709b72e1f51392e52d
      https://github.com/llvm/llvm-project/commit/b8f4f39d3d43d348e31fc5709b72e1f51392e52d
  Author: Schrodinger ZHU Yifan <yifanzhu at rochester.edu>
  Date:   2024-05-10 (Fri, 10 May 2024)

  Changed paths:
    M libc/src/__support/threads/linux/callonce.cpp

  Log Message:
  -----------
  [libc] avoid cmpxchg on the fastpath of callonce (#91748)

Avoid `cmpxchg` operation if the function has already been called.
The destination operand of `cmpxchg` may receive a write cycle without
regard to the result of the comparison



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