[PATCH] D91879: [Flang][OpenMP 4.5] Add semantic check for OpenMP Schedule Clause - chunk size

[Kiran Chandramohan via Phabricator via llvm-commits]

kiranchandramohan added subscribers: Meinersbur, huntergr.
kiranchandramohan added a comment.

I will provide my understanding below. Can also check with @huntergr @Meinersbur.

Team is a set of threads executing a parallel region. This restriction is that the chunk size (which can be a variable but only needs to be positive) should not be different for different threads in the team.
 So I think code like the following are disallowed. Not sure whether we can catch these during semantic checks.

  subroutine fn(a,b,c,N)
    integer :: i
    integer :: a(:), b(:), c(:)
    integer :: chunk
    !$omp parallel
    chunk = 1 + omp_get_thread_num()
    !$omp do schedule(static, chunk)
    do i=1,N
      a(i) = b(i) + c(i)
    end do
    !$omp end do
    !$omp end parallel
  end subroutine


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