sum_reduce_complex_4array Subroutine

  subroutine sum_reduce_complex_4array (z, dest)
    implicit none
    complex, dimension (:,:,:,:), intent (in out) :: z
    integer, intent (in) :: dest
# ifdef MPI
    integer :: ierror
!$OMP MASTER
    call time_message(.false., time_mp_collectives, ' MPI Collectives')
!$OMP END MASTER
    if(iproc.eq.dest) then
       call mpi_reduce &
            (MPI_IN_PLACE, z, size(z), mpicmplx, MPI_SUM, dest, mp_comm, ierror)
    else
       call mpi_reduce &
            (z, z, size(z), mpicmplx, MPI_SUM, dest, mp_comm, ierror)
    endif
!$OMP MASTER
    call time_message(.false., time_mp_collectives, ' MPI Collectives')
!$OMP END MASTER
# else
    if (dest /= 0) call mp_abort ("reduce to")
# endif
  end subroutine sum_reduce_complex_4array