[all-commits] [llvm/llvm-project] 45b899: [libc] Cache ownership of the shared buffer in the...

[Joseph Huber via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 45b899b92f5762c15d435e58666f5eee18e73b40
      https://github.com/llvm/llvm-project/commit/45b899b92f5762c15d435e58666f5eee18e73b40
  Author: Joseph Huber <jhuber6 at vols.utk.edu>
  Date:   2023-05-15 (Mon, 15 May 2023)

  Changed paths:
    M libc/src/__support/RPC/rpc.h

  Log Message:
  -----------
  [libc] Cache ownership of the shared buffer in the port

This patch adds another variable to cache cases where we know that we
own the buffer. This allows us to skip the atomic load on the inbox
because we already know its state. This is legal immediately after
opening a port, or when sending immediately after a recieve. This
caching nets a significant (~17%) speedup for the basic open, send,
recieve combination.

Reviewed By: JonChesterfield

Differential Revision: https://reviews.llvm.org/D150516