[Openmp-commits] [PATCH] D95816: [OpenMP] libomp: minor changes to improve library performance

Andrey Churbanov via Phabricator via Openmp-commits openmp-commits at lists.llvm.org
Mon Feb 1 13:25:23 PST 2021

AndreyChurbanov created this revision.
AndreyChurbanov added reviewers: hbae, jlpeyton, tlwilmar, Nawrin.
AndreyChurbanov added a project: OpenMP.
Herald added subscribers: guansong, yaxunl.
AndreyChurbanov requested review of this revision.
Herald added a reviewer: jdoerfert.
Herald added subscribers: openmp-commits, sstefan1.

Three minor changes in this patch:

- added UNLIKELY hint to few rarely executed branches;
- replaced couple of run time checks with debug assertions;
- moved check of presence of ittnotify tool from inside the function call.

These three changes incrementally improve library performance on SpecOMP2012 376.kdtree test to 1.5% in total
(used Intel 19 compiler + libomp on 2x24-core Intel CLX system).

  rG LLVM Github Monorepo



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