[Openmp-commits] [PATCH] D54305: Fix for bugzilla https://bugs.llvm.org/show_bug.cgi?id=39137.

Andrey Churbanov via Phabricator via Openmp-commits openmp-commits at lists.llvm.org
Fri Nov 9 05:50:37 PST 2018

AndreyChurbanov created this revision.
AndreyChurbanov added reviewers: hbae, tlwilmar, jlpeyton.
AndreyChurbanov added a project: OpenMP.
Herald added a subscriber: openmp-commits.

Exit earlier from omp_set_num_threads in case requested number of threads is equal to num_threads ICV (internal control variable), in order to avoid unnecessary write.

  rOMP OpenMP



Index: runtime/src/kmp_runtime.cpp
--- runtime/src/kmp_runtime.cpp
+++ runtime/src/kmp_runtime.cpp
@@ -2649,6 +2649,8 @@
   KMP_COUNT_VALUE(OMP_set_numthreads, new_nth);
   thread = __kmp_threads[gtid];
+  if (thread->th.th_current_task->td_icvs.nproc == new_nth)
+    return; // nothing to do

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