[all-commits] [llvm/llvm-project] f2f01f: [llvm][Support] Use `thread_local` caching for llv...

[Jeff Niu via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: f2f01f6b03aa81d5bdbf841a88f8853620c6902b
      https://github.com/llvm/llvm-project/commit/f2f01f6b03aa81d5bdbf841a88f8853620c6902b
  Author: Jeff Niu <jeff at modular.com>
  Date:   2024-04-01 (Mon, 01 Apr 2024)

  Changed paths:
    M llvm/lib/Support/Unix/Threading.inc

  Log Message:
  -----------
  [llvm][Support] Use `thread_local` caching for llvm::get_threadid() query on Apple systems (#87219)

I was profiling our compiler and noticed that `llvm::get_threadid` was
at the top of the hotlist, taking up a surprising 5% (7 seconds) in the
profile trace. It seems that computing this on MacOS systems is
non-trivial, so cache the result in a thread_local.

Co-authored-by: Mehdi Amini <joker.eph at gmail.com>



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