[Openmp-commits] [PATCH] D81497: [OpenMP] support alloc of serialized tasks

Joachim Protze via Phabricator via Openmp-commits openmp-commits at lists.llvm.org
Tue Jun 9 13:14:32 PDT 2020

protze.joachim created this revision.
protze.joachim added reviewers: AndreyChurbanov, hbae.
protze.joachim added a project: OpenMP.
Herald added subscribers: sstefan1, guansong, yaxunl.
Herald added a reviewer: jdoerfert.

Usually for serialized tasks (with if(0)), `__kmpc_omp_task_begin_if0` is used. 
This does not allow to track outgoing dependencies in case of detached tasks (see https://bugs.llvm.org/show_bug.cgi?id=46185).
Similarly, `mutexinoutset` would rather block than execute the task immediately.

This patch will allow to generate code as for normal tasks, but mark the task as undeferrable.

  rG LLVM Github Monorepo



Index: openmp/runtime/src/kmp_tasking.cpp
--- openmp/runtime/src/kmp_tasking.cpp
+++ openmp/runtime/src/kmp_tasking.cpp
@@ -1328,7 +1328,7 @@
   taskdata->td_flags.task_serial =
       (parent_task->td_flags.final || taskdata->td_flags.team_serial ||
-       taskdata->td_flags.tasking_ser);
+       taskdata->td_flags.tasking_ser || flags->task_serial);
   taskdata->td_flags.started = 0;
   taskdata->td_flags.executing = 0;

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