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359 lines
9.1 KiB
Fortran
359 lines
9.1 KiB
Fortran
module psb_s_diagprec
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use psb_s_base_prec_mod
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type, extends(psb_s_base_prec_type) :: psb_s_diag_prec_type
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real(psb_spk_), allocatable :: d(:)
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contains
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procedure, pass(prec) :: apply => psb_s_diag_apply
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procedure, pass(prec) :: precbld => psb_s_diag_precbld
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procedure, pass(prec) :: precinit => psb_s_diag_precinit
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procedure, pass(prec) :: precseti => psb_s_diag_precseti
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procedure, pass(prec) :: precsetr => psb_s_diag_precsetr
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procedure, pass(prec) :: precsetc => psb_s_diag_precsetc
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procedure, pass(prec) :: precfree => psb_s_diag_precfree
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procedure, pass(prec) :: precdescr => psb_s_diag_precdescr
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procedure, pass(prec) :: sizeof => psb_s_diag_sizeof
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end type psb_s_diag_prec_type
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private :: psb_s_diag_apply, psb_s_diag_precbld, psb_s_diag_precseti,&
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& psb_s_diag_precsetr, psb_s_diag_precsetc, psb_s_diag_sizeof,&
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& psb_s_diag_precinit, psb_s_diag_precfree, psb_s_diag_precdescr
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contains
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subroutine psb_s_diag_apply(alpha,prec,x,beta,y,desc_data,info,trans,work)
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use psb_sparse_mod
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type(psb_desc_type),intent(in) :: desc_data
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class(psb_s_diag_prec_type), intent(in) :: prec
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real(psb_spk_),intent(in) :: x(:)
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real(psb_spk_),intent(in) :: alpha, beta
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real(psb_spk_),intent(inout) :: y(:)
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integer, intent(out) :: info
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character(len=1), optional :: trans
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real(psb_spk_),intent(inout), optional, target :: work(:)
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Integer :: err_act, nrow
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character(len=20) :: name='s_diag_prec_apply'
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real(psb_spk_), pointer :: ww(:)
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call psb_erractionsave(err_act)
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!
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! This is the base version and we should throw an error.
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! Or should it be the DIAG preonditioner???
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!
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info = psb_success_
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nrow = psb_cd_get_local_rows(desc_data)
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if (size(x) < nrow) then
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info = 36
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call psb_errpush(info,name,i_err=(/2,nrow,0,0,0/))
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goto 9999
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end if
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if (size(y) < nrow) then
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info = 36
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call psb_errpush(info,name,i_err=(/3,nrow,0,0,0/))
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goto 9999
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end if
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if (.not.allocated(prec%d)) then
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info = 1124
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call psb_errpush(info,name,a_err="preconditioner: D")
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goto 9999
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end if
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if (size(prec%d) < nrow) then
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info = 1124
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call psb_errpush(info,name,a_err="preconditioner: D")
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goto 9999
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end if
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if (size(work) >= size(x)) then
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ww => work
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else
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allocate(ww(size(x)),stat=info)
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if (info /= psb_success_) then
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call psb_errpush(psb_err_alloc_request_,name,i_err=(/size(x),0,0,0,0/),a_err='real(psb_spk_)')
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goto 9999
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end if
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end if
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ww(1:nrow) = x(1:nrow)*prec%d(1:nrow)
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call psb_geaxpby(alpha,ww,beta,y,desc_data,info)
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if (size(work) < size(x)) then
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deallocate(ww,stat=info)
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if (info /= psb_success_) then
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call psb_errpush(psb_err_from_subroutine_,name,a_err='Deallocate')
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goto 9999
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end if
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end if
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call psb_erractionrestore(err_act)
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return
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9999 continue
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call psb_erractionrestore(err_act)
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if (err_act == psb_act_abort_) then
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call psb_error()
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return
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end if
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return
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end subroutine psb_s_diag_apply
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subroutine psb_s_diag_precinit(prec,info)
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use psb_sparse_mod
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Implicit None
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class(psb_s_diag_prec_type),intent(inout) :: prec
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integer, intent(out) :: info
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Integer :: err_act, nrow
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character(len=20) :: name='s_diag_precinit'
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call psb_erractionsave(err_act)
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info = psb_success_
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call psb_erractionrestore(err_act)
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return
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9999 continue
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call psb_erractionrestore(err_act)
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if (err_act == psb_act_abort_) then
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call psb_error()
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return
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end if
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return
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end subroutine psb_s_diag_precinit
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subroutine psb_s_diag_precbld(a,desc_a,prec,info,upd,mold,afmt)
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use psb_sparse_mod
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Implicit None
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type(psb_sspmat_type), intent(in), target :: a
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type(psb_desc_type), intent(in), target :: desc_a
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class(psb_s_diag_prec_type),intent(inout) :: prec
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integer, intent(out) :: info
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character, intent(in), optional :: upd
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character(len=*), intent(in), optional :: afmt
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class(psb_s_base_sparse_mat), intent(in), optional :: mold
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Integer :: err_act, nrow,i
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character(len=20) :: name='s_diag_precbld'
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call psb_erractionsave(err_act)
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info = psb_success_
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nrow = psb_cd_get_local_cols(desc_a)
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if (allocated(prec%d)) then
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if (size(prec%d) < nrow) then
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deallocate(prec%d,stat=info)
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end if
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end if
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if ((info == psb_success_).and.(.not.allocated(prec%d))) then
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allocate(prec%d(nrow), stat=info)
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end if
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if (info /= psb_success_) then
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info = psb_err_alloc_dealloc_
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call psb_errpush(info,name)
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goto 9999
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end if
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call a%get_diag(prec%d,info)
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if (info /= psb_success_) then
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info = psb_err_from_subroutine_
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call psb_errpush(info,name, a_err='get_diag')
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goto 9999
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end if
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do i=1,nrow
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if (prec%d(i) == dzero) then
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prec%d(i) = done
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else
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prec%d(i) = done/prec%d(i)
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endif
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end do
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call psb_erractionrestore(err_act)
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return
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9999 continue
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call psb_erractionrestore(err_act)
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if (err_act == psb_act_abort_) then
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call psb_error()
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return
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end if
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return
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end subroutine psb_s_diag_precbld
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subroutine psb_s_diag_precseti(prec,what,val,info)
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use psb_sparse_mod
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Implicit None
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class(psb_s_diag_prec_type),intent(inout) :: prec
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integer, intent(in) :: what
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integer, intent(in) :: val
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integer, intent(out) :: info
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Integer :: err_act, nrow
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character(len=20) :: name='s_diag_precset'
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call psb_erractionsave(err_act)
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info = psb_success_
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call psb_erractionrestore(err_act)
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return
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9999 continue
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call psb_erractionrestore(err_act)
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if (err_act == psb_act_abort_) then
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call psb_error()
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return
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end if
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return
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end subroutine psb_s_diag_precseti
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subroutine psb_s_diag_precsetr(prec,what,val,info)
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use psb_sparse_mod
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Implicit None
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class(psb_s_diag_prec_type),intent(inout) :: prec
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integer, intent(in) :: what
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real(psb_spk_), intent(in) :: val
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integer, intent(out) :: info
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Integer :: err_act, nrow
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character(len=20) :: name='s_diag_precset'
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call psb_erractionsave(err_act)
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info = psb_success_
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call psb_erractionrestore(err_act)
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return
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9999 continue
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call psb_erractionrestore(err_act)
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if (err_act == psb_act_abort_) then
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call psb_error()
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return
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end if
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return
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end subroutine psb_s_diag_precsetr
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subroutine psb_s_diag_precsetc(prec,what,val,info)
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use psb_sparse_mod
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Implicit None
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class(psb_s_diag_prec_type),intent(inout) :: prec
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integer, intent(in) :: what
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character(len=*), intent(in) :: val
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integer, intent(out) :: info
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Integer :: err_act, nrow
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character(len=20) :: name='s_diag_precset'
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call psb_erractionsave(err_act)
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info = psb_success_
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call psb_erractionrestore(err_act)
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return
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9999 continue
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call psb_erractionrestore(err_act)
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if (err_act == psb_act_abort_) then
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call psb_error()
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return
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end if
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return
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end subroutine psb_s_diag_precsetc
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subroutine psb_s_diag_precfree(prec,info)
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use psb_sparse_mod
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Implicit None
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class(psb_s_diag_prec_type), intent(inout) :: prec
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integer, intent(out) :: info
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Integer :: err_act, nrow
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character(len=20) :: name='s_diag_precset'
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call psb_erractionsave(err_act)
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info = psb_success_
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call psb_erractionrestore(err_act)
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return
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9999 continue
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call psb_erractionrestore(err_act)
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if (err_act == psb_act_abort_) then
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call psb_error()
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return
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end if
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return
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end subroutine psb_s_diag_precfree
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subroutine psb_s_diag_precdescr(prec,iout)
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use psb_sparse_mod
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Implicit None
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class(psb_s_diag_prec_type), intent(in) :: prec
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integer, intent(in), optional :: iout
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Integer :: err_act, nrow, info
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character(len=20) :: name='s_diag_precdescr'
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integer :: iout_
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call psb_erractionsave(err_act)
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info = psb_success_
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if (present(iout)) then
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iout_ = iout
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else
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iout_ = 6
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end if
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write(iout_,*) 'Diagonal scaling'
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call psb_erractionsave(err_act)
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info = psb_success_
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call psb_erractionrestore(err_act)
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return
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9999 continue
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call psb_erractionrestore(err_act)
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if (err_act == psb_act_abort_) then
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call psb_error()
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return
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end if
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return
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end subroutine psb_s_diag_precdescr
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function psb_s_diag_sizeof(prec) result(val)
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use psb_sparse_mod
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class(psb_s_diag_prec_type), intent(in) :: prec
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integer(psb_long_int_k_) :: val
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val = 0
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val = val + psb_sizeof_sp * size(prec%d)
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return
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end function psb_s_diag_sizeof
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end module psb_s_diagprec
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