tree 20e06e61e45b373a10130f707698a7a6641c8e07
parent 31018a5345360ff9375fc00f36d11dc517edcd76
author AndreyChurbanov <andrey.churbanov@intel.com> 1615303808 +0300
committer Copybara-Service <copybara-worker@google.com> 1616071526 -0700

[OpenMP] libomp: eliminate pause from atomic CAS loops

For clang this change is NFC cleanup, because clang
never calls atomic functions from runtime library.

Basically, pause is good in spin-loops waiting for something.
Atomic CAS loops do not wait for anything,
each CAS failure means some other thread progressed.

Performance experiments show that the pause only causes unnecessary slowdown
on CPUs with slow pause instruction, no difference on CPUs with fast pause
instruction, removal of the pause gives lesser binary size which is good.

Differential Revision: https://reviews.llvm.org/D97079

GitOrigin-RevId: aaf16b80dd4cdeb84caae8f3785ce7e4cc7a0f69