psblas3/base/tools/psb_cdren.f90

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!!$              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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! File: psb_cdren.f90
!  
!  WARNING: this routine is almost certainly obsolete. Must be reviewed.
! 
! Subroutine: psb_cdren
!    Updates a communication descriptor according to a renumbering scheme.
! 
! Arguments: 
!    trans    - character.                     Whether iperm or its transpose 
!                                              should be applied.
!    iperm    - integer,dimension(:).          The renumbering scheme.
!    desc_a   - type(psb_desc_type).         The communication descriptor
!                                              to be updated.
!    info     - integer.                       Return code
!
subroutine psb_cdren(trans,iperm,desc_a,info)
  use psb_descriptor_type
  use psb_const_mod
  use psb_error_mod
  use psb_penv_mod
  use psb_string_mod
  implicit none

  interface isaperm
    logical function isaperm(n,ip)
      integer, intent(in)    :: n   
      integer, intent(inout) :: ip(*)
    end function isaperm
  end interface

  !...parameters....
  type(psb_desc_type), intent(inout)    ::  desc_a
  integer, intent(inout)                ::  iperm(:)
  character, intent(in)                 :: trans
  integer, intent(out)                  :: info
  !....locals....
  integer              :: i,j,np,me, n_col, kh, nh
  integer              :: dectype
  integer              :: ictxt,n_row, int_err(5), err_act
  integer              :: debug_level, debug_unit
  character(len=20)    :: name

  if(psb_get_errstatus() /= 0) return 
  info=0
  call psb_erractionsave(err_act)
  name = 'psb_dcren'
  debug_unit  = psb_get_debug_unit()
  debug_level = psb_get_debug_level()

  ictxt   = psb_cd_get_context(desc_a)
  dectype = psb_cd_get_dectype(desc_a)
  n_row   = psb_cd_get_local_rows(desc_a)
  n_col   = psb_cd_get_local_cols(desc_a)

  ! check on blacs grid 
  call psb_info(ictxt, me, np)
  if (np == -1) then
    info = 2010
    call psb_errpush(info,name)
    goto 9999
  endif

  if (.not.psb_is_asb_desc(desc_a)) then 
    info = 600
    int_err(1) = dectype
    call psb_errpush(info,name,int_err)
    goto 9999
  endif

  if (iperm(1) /= 0) then 
    if (.not.isaperm(n_row,iperm)) then
      info = 610
      int_err(1) = iperm(1)
      call psb_errpush(info,name,int_err)
      goto 9999
    endif
  endif


  !check on errors encountered in psdspins

  if ((iperm(1) /= 0))   then 

    if (debug_level >= psb_debug_ext_) &
         & write(debug_unit,*) me,' ',trim(name),': here we go with ',iperm(1) 
    call psb_ensure_size(n_col,desc_a%lprm,info)
    if (toupper(trans) == 'N') then 
      do i=1, n_row
        desc_a%lprm(iperm(i)) = i
      enddo
      do i=n_row+1,n_col
        desc_a%lprm(i) = i
      enddo
    else if (toupper(trans) == 'T') then 
      do i=1, n_row
        desc_a%lprm(i) = iperm(i)
      enddo
      do i=n_row+1,n_col
        desc_a%lprm(i) = i
      enddo
    endif
    ! crossed fingers.....
    ! fix glob_to_loc/loc_to_glob  mappings, then indices lists
    ! hmm, maybe we should just moe all of this onto a different level,
    ! have a specialized subroutine, and do it in the solver context???? 
    if (debug_level >= psb_debug_ext_) &
         & write(debug_unit,*) me,' ',trim(name),': renumbering glob_to_loc'
    do i=1, n_col
      desc_a%glob_to_loc(desc_a%loc_to_glob(desc_a%lprm(i))) = i  
    enddo
    if (debug_level >= psb_debug_ext_) &
         & write(debug_unit,*) me,' ',trim(name),': renumbering loc_to_glob'
    do i=1,psb_cd_get_global_rows(desc_a) 
      j = desc_a%glob_to_loc(i)
      if (j>0) then 
        desc_a%loc_to_glob(j) = i
      endif
    enddo
    if (debug_level >= psb_debug_ext_) &
         & write(debug_unit,*) me,' ',trim(name),': renumbering halo_index'
    i=1
    kh=desc_a%halo_index(i)
    do while (kh /= -1) 
      i = i+1
      nh = desc_a%halo_index(i)
      do j = i+1, i+nh
        desc_a%halo_index(j) = &
             &desc_a%lprm(desc_a%halo_index(j))
      enddo
      i = i + nh + 1
      nh = desc_a%halo_index(i)
      do j= i+1, i+nh
        desc_a%halo_index(j) = &
             &desc_a%lprm(desc_a%halo_index(j))
      enddo
      i = i + nh + 1
      kh=desc_a%halo_index(i)
    enddo
    if (debug_level >= psb_debug_ext_) &
         & write(debug_unit,*) me,' ',trim(name),': renumbering ovrlap_index'
    i=1
    kh=desc_a%ovrlap_index(i)
    do while (kh /= -1) 
      i = i + 1
      nh = desc_a%ovrlap_index(i)
      do j= i+1, i+nh
        desc_a%ovrlap_index(j) = &
             &desc_a%lprm(desc_a%ovrlap_index(j))
      enddo
      i = i + nh + 1
      kh=desc_a%ovrlap_index(i)
    enddo
    if (debug_level >= psb_debug_ext_) &
         & write(debug_unit,*) me,' ',&
         & trim(name),': renumbering ovrlap_elem'

    do i=1, size(desc_a%ovrlap_elem,1)
      desc_a%ovrlap_elem(i,1) = desc_a%lprm(desc_a%ovrlap_elem(i,1))
    end do

    if (debug_level >= psb_debug_ext_) &
         & write(debug_unit,*) me,' ',trim(name),': done renumbering'
  else 
    if (debug_level >= psb_debug_ext_) &
         & write(debug_unit,*) me,' ',trim(name),': nothing to be done'
  endif
  if (debug_level >= psb_debug_ext_) &
       & write(debug_unit,*) me,' ',trim(name),': end'

  call psb_erractionrestore(err_act)
  return

9999 continue
  call psb_erractionrestore(err_act)

  if (err_act == psb_act_ret_) then
    return
  else
    call psb_error(ictxt)
  end if
  return

end subroutine psb_cdren