matrix.f90

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module matrix
  use neko_config
  use num_types
  use device
  use device_math
  use utils
  use, intrinsic :: iso_c_binding
  implicit none
  private
 
  type, public ::  matrix_t
     real(kind=rp), allocatable :: x(:,:) 
     type(c_ptr) :: x_d = c_null_ptr      
     integer :: nrows  = 0
     integer :: ncols  = 0
     integer :: n = 0
   contains
     procedure, pass(m) :: init => matrix_init
     procedure, pass(m) :: free => matrix_free
     procedure, pass(m) :: size => matrix_size
     procedure, pass(m) :: matrix_assign_matrix
     procedure, pass(m) :: matrix_assign_scalar
     generic :: assignment(=) => matrix_assign_matrix, &
          matrix_assign_scalar
  end type matrix_t
 
contains
 
  subroutine matrix_init(m, nrows, ncols)
    class(matrix_t), intent(inout) :: m
    integer, intent(in) :: nrows
    integer, intent(in) :: ncols
 
    call m%free()
 
    allocate(m%x(nrows, ncols))
    m%x = 0.0_rp
    m%nrows = nrows
    m%ncols = ncols
    m%n = nrows*ncols
 
    if (neko_bcknd_device .eq. 1) then
       call device_map(m%x, m%x_d, m%n)
       call device_cfill(m%x_d, 0.0_rp, m%n)
    end if
 
  end subroutine matrix_init
 
  subroutine matrix_free(m)
    class(matrix_t), intent(inout) :: m
 
    if (allocated(m%x)) then
       deallocate(m%x)
    end if
 
    if (c_associated(m%x_d)) then
       call device_free(m%x_d)
    end if
 
    m%nrows = 0
    m%ncols = 0
    m%n = 0
 
  end subroutine matrix_free
 
  function matrix_size(m) result(s)
    class(matrix_t), intent(inout) :: m
    integer :: s
    s = m%n
  end function matrix_size
 
  subroutine matrix_assign_matrix(m, w)
    class(matrix_t), intent(inout) :: m
    type(matrix_t), intent(in) :: w
 
    if (allocated(m%x)) then
       call m%free()
    end if
 
    if (.not. allocated(m%x)) then
 
       m%nrows = w%nrows
       m%ncols = w%ncols
       m%n = w%n
       allocate(m%x(m%nrows, m%ncols))
 
       if (neko_bcknd_device .eq. 1) then
          call device_map(m%x, m%x_d, m%n)
       end if
 
    end if
 
    if (neko_bcknd_device .eq. 1) then
       call device_copy(m%x_d, w%x_d, m%n)
    else
       m%x = w%x
    end if
 
  end subroutine matrix_assign_matrix
 
  subroutine matrix_assign_scalar(m, s)
    class(matrix_t), intent(inout) :: m
    real(kind=rp), intent(in) :: s
 
    if (.not. allocated(m%x)) then
       call neko_error('matrix not allocated')
    end if
 
    if (neko_bcknd_device .eq. 1) then
       call device_cfill(m%x_d, s, m%n)
    else
       m%x = s
    end if
 
  end subroutine matrix_assign_scalar
 
 
end module matrix