psblas3/prec/psb_dbjac_bld.f90

!!$ 
!!$              Parallel Sparse BLAS  v2.0
!!$    (C) Copyright 2006 Salvatore Filippone    University of Rome Tor Vergata
!!$                       Alfredo Buttari        University of Rome Tor Vergata
!!$ 
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!!$  
subroutine psb_dbjac_bld(a,desc_a,p,upd,info)
  use psb_base_mod
  use psb_prec_mod, psb_protect_name => psb_dbjac_bld
  implicit none
  !                                                                               
  !     .. Scalar Arguments ..                                                    
  integer, intent(out)                      :: info
  !     .. array Arguments ..                                                     
  type(psb_dspmat_type), intent(in), target :: a
  type(psb_dprec_type), intent(inout)    :: p
  type(psb_desc_type), intent(in)           :: desc_a
  character, intent(in)                     :: upd

  !     .. Local Scalars ..                                                       
  integer  ::    i, m
  integer  ::    int_err(5)
  character ::        trans, unitd
  type(psb_dspmat_type) :: atmp
  real(kind(1.d0)) :: t1,t2,t3,t4,t5,t6, t7, t8
  integer   nztota,  err_act, n_row, nrow_a,n_col, nhalo
  integer :: ictxt,np,me
  character(len=20)      :: name, ch_err


  if(psb_get_errstatus() /= 0) return 
  info=0
  name='psb_dbjac_bld'
  call psb_erractionsave(err_act)

  ictxt=psb_cd_get_context(desc_a)
  call psb_info(ictxt, me, np)

  m = a%m
  if (m < 0) then
    info = 10
    int_err(1) = 1
    int_err(2) = m
    call psb_errpush(info,name,i_err=int_err)
    goto 9999
  endif
  trans = 'N'
  unitd = 'U'
  call psb_nullify_sp(atmp)

  call psb_cdcpy(desc_a,p%desc_data,info)
  if(info /= 0) then
    info=4010
    ch_err='psb_cdcpy'
    call psb_errpush(info,name,a_err=ch_err)
    goto 9999
  end if


  select case(p%iprcparm(psb_f_type_))

  case(psb_f_ilu_n_) 

    if (allocated(p%av)) then 
      if (size(p%av) < psb_bp_ilu_avsz) then 
        do i=1,size(p%av) 
          call psb_sp_free(p%av(i),info)
          if (info /= 0) then 
            ! Actually, we don't care here about this.
            ! Just let it go.
            ! return
          end if
        enddo
        deallocate(p%av,stat=info)
      endif
    end if
    if (.not.allocated(p%av)) then 
      allocate(p%av(psb_max_avsz),stat=info)
      if (info /= 0) then
        call psb_errpush(4000,name)
        goto 9999
      end if
    endif

    nrow_a = psb_cd_get_local_rows(desc_a)
    nztota = psb_sp_get_nnzeros(a)

    n_col  = psb_cd_get_local_cols(desc_a)
    nhalo  = n_col-nrow_a
    n_row  = p%desc_data%matrix_data(psb_n_row_)
    p%av(psb_l_pr_)%m  = n_row
    p%av(psb_l_pr_)%k  = n_row
    p%av(psb_u_pr_)%m  = n_row
    p%av(psb_u_pr_)%k  = n_row
    call psb_sp_all(n_row,n_row,p%av(psb_l_pr_),nztota,info)
    if (info == 0) call psb_sp_all(n_row,n_row,p%av(psb_u_pr_),nztota,info)
    if(info/=0) then
      info=4010
      ch_err='psb_sp_all'
      call psb_errpush(info,name,a_err=ch_err)
      goto 9999
    end if

    if (allocated(p%d)) then 
      if (size(p%d) < n_row) then 
        deallocate(p%d)
      endif
    endif
    if (.not.allocated(p%d)) then 
      allocate(p%d(n_row),stat=info)
      if (info /= 0) then 
        call psb_errpush(4010,name,a_err='Allocate')
        goto 9999      
      end if

    endif
    t3 = psb_wtime()
    ! This is where we have mo renumbering, thus no need 
    ! for ATMP

    call psb_ilu_fct(a,p%av(psb_l_pr_),p%av(psb_u_pr_),p%d,info)
    if(info/=0) then
      info=4010
      ch_err='psb_ilu_fct'
      call psb_errpush(info,name,a_err=ch_err)
      goto 9999
    end if

    if (psb_sp_getifld(psb_upd_,p%av(psb_u_pr_),info) /= psb_upd_perm_) then
      call psb_sp_trim(p%av(psb_u_pr_),info)
    endif

    if (psb_sp_getifld(psb_upd_,p%av(psb_l_pr_),info) /= psb_upd_perm_) then
      call psb_sp_trim(p%av(psb_l_pr_),info)
    endif


  case(psb_f_none_) 
    info=4010
    ch_err='Inconsistent prec  psb_f_none_'
    call psb_errpush(info,name,a_err=ch_err)
    goto 9999

  case default
    info=4010
    ch_err='Unknown psb_f_type_'
    call psb_errpush(info,name,a_err=ch_err)
    goto 9999
  end select


  call psb_erractionrestore(err_act)
  return

9999 continue
  call psb_erractionrestore(err_act)
  if (err_act == psb_act_abort_) then
    call psb_error()
    return
  end if
  return


end subroutine psb_dbjac_bld