psblas3/baseprec/psb_dprecbld.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_dprecbld(a,desc_a,p,info,upd)

  use psb_base_mod
  use psb_prec_type
  Implicit None

  type(psb_dspmat_type), target           :: a
  type(psb_desc_type), intent(in), target :: desc_a
  type(psb_dprec_type),intent(inout)      :: p
  integer, intent(out)                    :: info
  character, intent(in), optional         :: upd

  interface psb_diagsc_bld
    subroutine psb_ddiagsc_bld(a,desc_data,p,upd,info)
      use psb_base_mod
      use psb_prec_type
      integer, intent(out) :: info
      type(psb_dspmat_type), intent(in), target :: a
      type(psb_desc_type),intent(in)            :: desc_data
      type(psb_dprec_type), intent(inout)    :: p
      character, intent(in)                     :: upd
    end subroutine psb_ddiagsc_bld
  end interface

  interface psb_ilu_bld
    subroutine psb_dilu_bld(a,desc_data,p,upd,info)
      use psb_base_mod
      use psb_prec_type
      integer, intent(out) :: info
      type(psb_dspmat_type), intent(in), target :: a
      type(psb_desc_type),intent(in)            :: desc_data
      type(psb_dprec_type), intent(inout)    :: p
      character, intent(in)                     :: upd
    end subroutine psb_dilu_bld
  end interface

  ! Local scalars
  Integer      :: err, nnzero, n_row, n_col,I,j,k,ictxt,&
       & me,mycol,np,npcol,mglob,lw, mtype, nrg, nzg, err_act
  real(kind(1.d0))         :: temp, real_err(5)
  real(kind(1.d0)),pointer :: gd(:), work(:)
  integer      :: int_err(5)
  character    :: iupd

  logical, parameter :: debug=.false.
  integer,parameter  :: iroot=0,iout=60,ilout=40
  character(len=20)   :: name, ch_err

  if(psb_get_errstatus().ne.0) return 
  info=0
  err=0
  call psb_erractionsave(err_act)
  name = 'psb_precbld'

  if (debug) write(0,*) 'Entering precbld',P%prec,desc_a%matrix_data(:)
  info = 0
  int_err(1) = 0
  ictxt = psb_cd_get_context(desc_a)

  if (debug) write(0,*) 'Preconditioner psb_info'
  call psb_info(ictxt, me, np)

  if (present(upd)) then 
    if (debug) write(0,*) 'UPD ', upd
    if ((upd.eq.'F').or.(upd.eq.'T')) then
      iupd=upd
    else
      iupd='F'
    endif
  else
    iupd='F'
  endif
  n_row   = psb_cd_get_local_rows(desc_a)
  n_col   = psb_cd_get_local_cols(desc_a)
  mglob   = psb_cd_get_global_rows(desc_a)
  !
  ! Should add check to ensure all procs have the same... 
  !
  ! ALso should define symbolic names for the preconditioners. 
  !

  call psb_check_def(p%iprcparm(p_type_),'base_prec',&
       &  diagsc_,is_legal_base_prec)

  call psb_nullify_desc(p%desc_data)

  select case(p%iprcparm(p_type_)) 
  case (noprec_)
    ! Do nothing. 
    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

  case (diagsc_)

    call psb_diagsc_bld(a,desc_a,p,iupd,info)
    if(debug) write(0,*)me,': out of psb_diagsc_bld'
    if(info /= 0) then
      info=4010
      ch_err='psb_diagsc_bld'
      call psb_errpush(info,name,a_err=ch_err)
      goto 9999
    end if

  case (bja_)

    call psb_check_def(p%iprcparm(iren_),'renumbering',&
         &  renum_none_,is_legal_renum)
    call psb_check_def(p%iprcparm(f_type_),'fact',&
         &  f_ilu_n_,is_legal_ml_fact)

    if (debug) write(0,*)me, ': Calling PSB_ILU_BLD'
    if (debug) call psb_barrier(ictxt)
    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
    allocate(p%av(max_avsz),stat=info)
    if(info /= 0) then
      info=4000
      call psb_errpush(info,name)
      goto 9999
    end if
    
    select case(p%iprcparm(f_type_))

    case(f_ilu_n_,f_ilu_e_) 
      call psb_ilu_bld(a,desc_a,p,iupd,info)
      if(debug) write(0,*)me,': out of psb_ilu_bld',info
      if (debug) call psb_barrier(ictxt)
      if(info /= 0) then
        info=4010
        ch_err='psb_ilu_bld'
        call psb_errpush(info,name,a_err=ch_err)
        goto 9999
      end if

    case(f_none_) 
      write(0,*) 'Fact=None in BASEPRC_BLD Bja/ASM??'
      info=4010
      ch_err='Inconsistent prec  f_none_'
      call psb_errpush(info,name,a_err=ch_err)
      goto 9999

    case default
      write(0,*) 'Unknown factor type in baseprc_bld bja/asm: ',&
           &p%iprcparm(f_type_)
      info=4010
      ch_err='Unknown f_type_'
      call psb_errpush(info,name,a_err=ch_err)
      goto 9999
    end select
  case default
    info=4010
    ch_err='Unknown p_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.eq.psb_act_abort_) then
    call psb_error()
    return
  end if
  return


end subroutine psb_dprecbld