[PATCH] D71989: [OpenMP][IRBuilder][WIP] Prototype `omp task` support

[Johannes Doerfert via Phabricator via llvm-commits]

jdoerfert created this revision.
jdoerfert added reviewers: rogfer01, ABataev, JonChesterfield, kiranchandramohan, fghanim.
Herald added subscribers: guansong, bollu, hiraditya.
Herald added projects: OpenMP, LLVM.

NOTE: The patch is not complete and lacks testing but it should allow
      people to see how the IRBuilder will evolve and give feedback.

This patch adds support for `omp task` to the OpenMPIRBuilder. To
simplify this *and* to make optimizations of tasks possible, we
introduce a new interface: `__kmpc_task`.

Similar to TRegions, the new interface exposes front-end information in
a direct way. More importantly, the task create and task issue step are
conceptually not separated anymore as it is, together with other
non-user related code, hidden inside `__kmpc_task`.

Most of the properties of a task are supported already, incl. dependences.

The outlining logic used for `omp parallel` was (slightly) generalized
and reused but better abstractions are needed.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D71989

Files:
  llvm/include/llvm/Frontend/OpenMP/OMPConstants.h
  llvm/include/llvm/Frontend/OpenMP/OMPIRBuilder.h
  llvm/include/llvm/Frontend/OpenMP/OMPKinds.def
  llvm/lib/Frontend/OpenMP/OMPIRBuilder.cpp
  llvm/unittests/Frontend/OpenMPIRBuilderTest.cpp
  openmp/runtime/src/kmp.h
  openmp/runtime/src/kmp_tasking.cpp

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