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[OpenMP] libomp: add check of task function pointer for NULL

Authored by AndreyChurbanov on Oct 18 2021, 9:32 AM.



This patch allows to simplify compiler implementation on "taskwait nowait" construct.
The "taskwait nowait" is semantically equivalent to the empty task.
Instead of creating an empty routine as a task entry, compiler can just send NULL pointer to the runtime.
Then the runtime will make all the work with dependences and return because of the absent task routine.

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Event Timeline

AndreyChurbanov requested review of this revision.Oct 18 2021, 9:32 AM
This revision is now accepted and ready to land.Oct 18 2021, 9:40 AM
This revision was landed with ongoing or failed builds.Oct 18 2021, 9:48 AM
This revision was automatically updated to reflect the committed changes.

I already know, that OMPD folks will not be happy about this implementation. Nevertheless, it is a valid and better implementation than before.

Regarding OMPT implementation: since you are not calling into the application anymore, this case should now really use ompt_taskwait_complete rather than switching to the taskwait task and back.