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psblas3/prec/impl/psb_d_diagprec_impl.f90

260 lines
6.6 KiB
Fortran

subroutine psb_d_diag_apply_vect(alpha,prec,x,beta,y,desc_data,info,trans,work)
use psb_base_mod
use psb_d_diagprec, psb_protect_name => psb_d_diag_apply_vect
implicit none
type(psb_desc_type),intent(in) :: desc_data
class(psb_d_diag_prec_type), intent(inout) :: prec
type(psb_d_vect_type),intent(inout) :: x
real(psb_dpk_),intent(in) :: alpha, beta
type(psb_d_vect_type),intent(inout) :: y
integer(psb_ipk_), intent(out) :: info
character(len=1), optional :: trans
real(psb_dpk_),intent(inout), optional, target :: work(:)
integer(psb_ipk_) :: err_act, nrow
character(len=20) :: name='d_diag_prec_apply'
real(psb_dpk_), pointer :: ww(:)
class(psb_d_base_vect_type), allocatable :: dw
call psb_erractionsave(err_act)
!
! This is the base version and we should throw an error.
! Or should it be the DIAG preonditioner???
!
info = psb_success_
nrow = desc_data%get_local_rows()
if (x%get_nrows() < nrow) then
info = 36
call psb_errpush(info,name,i_err=(/2,nrow,0,0,0/))
goto 9999
end if
if (y%get_nrows() < nrow) then
info = 36
call psb_errpush(info,name,i_err=(/3,nrow,0,0,0/))
goto 9999
end if
if (.not.allocated(prec%d)) then
info = 1124
call psb_errpush(info,name,a_err="preconditioner: D")
goto 9999
end if
if (size(prec%d) < nrow) then
info = 1124
call psb_errpush(info,name,a_err="preconditioner: D")
goto 9999
end if
if (size(work) >= x%get_nrows()) then
ww => work
else
allocate(ww(x%get_nrows()),stat=info)
if (info /= psb_success_) then
call psb_errpush(psb_err_alloc_request_,name,&
& i_err=(/x%get_nrows(),0,0,0,0/),a_err='real(psb_dpk_)')
goto 9999
end if
end if
call y%mlt(alpha,prec%dv,x,beta,info,conjgx=trans)
if (size(work) < x%get_nrows()) then
deallocate(ww,stat=info)
if (info /= psb_success_) then
call psb_errpush(psb_err_from_subroutine_,name,a_err='Deallocate')
goto 9999
end if
end if
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_d_diag_apply_vect
subroutine psb_d_diag_apply(alpha,prec,x,beta,y,desc_data,info,trans,work)
use psb_base_mod
use psb_d_diagprec, psb_protect_name => psb_d_diag_apply
implicit none
type(psb_desc_type),intent(in) :: desc_data
class(psb_d_diag_prec_type), intent(in) :: prec
real(psb_dpk_),intent(inout) :: x(:)
real(psb_dpk_),intent(in) :: alpha, beta
real(psb_dpk_),intent(inout) :: y(:)
integer(psb_ipk_), intent(out) :: info
character(len=1), optional :: trans
real(psb_dpk_),intent(inout), optional, target :: work(:)
integer(psb_ipk_) :: err_act, nrow
character :: trans_
character(len=20) :: name='d_diag_prec_apply'
real(psb_dpk_), pointer :: ww(:)
call psb_erractionsave(err_act)
info = psb_success_
nrow = desc_data%get_local_rows()
if (size(x) < nrow) then
info = 36
call psb_errpush(info,name,i_err=(/2,nrow,0,0,0/))
goto 9999
end if
if (size(y) < nrow) then
info = 36
call psb_errpush(info,name,i_err=(/3,nrow,0,0,0/))
goto 9999
end if
if (.not.allocated(prec%d)) then
info = 1124
call psb_errpush(info,name,a_err="preconditioner: D")
goto 9999
end if
if (size(prec%d) < nrow) then
info = 1124
call psb_errpush(info,name,a_err="preconditioner: D")
goto 9999
end if
if (present(trans)) then
trans_ = psb_toupper(trans)
else
trans_='N'
end if
select case(trans_)
case('N')
case('T','C')
case default
info=psb_err_iarg_invalid_i_
call psb_errpush(info,name,&
& i_err=(/6,0,0,0,0/),a_err=trans_)
goto 9999
end select
if (size(work) >= size(x)) then
ww => work
else
allocate(ww(size(x)),stat=info)
if (info /= psb_success_) then
call psb_errpush(psb_err_alloc_request_,name,&
& i_err=(/size(x),0,0,0,0/),a_err='real(psb_dpk_)')
goto 9999
end if
end if
if (trans_ == 'C') then
ww(1:nrow) = x(1:nrow)*(prec%d(1:nrow))
else
ww(1:nrow) = x(1:nrow)*prec%d(1:nrow)
endif
call psb_geaxpby(alpha,ww,beta,y,desc_data,info)
if (size(work) < size(x)) then
deallocate(ww,stat=info)
if (info /= psb_success_) then
call psb_errpush(psb_err_from_subroutine_,name,a_err='Deallocate')
goto 9999
end if
end if
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_d_diag_apply
subroutine psb_d_diag_precbld(a,desc_a,prec,info,upd,amold,afmt,vmold)
use psb_base_mod
use psb_d_diagprec, psb_protect_name => psb_d_diag_precbld
Implicit None
type(psb_dspmat_type), intent(in), target :: a
type(psb_desc_type), intent(in), target :: desc_a
class(psb_d_diag_prec_type),intent(inout) :: prec
integer(psb_ipk_), intent(out) :: info
character, intent(in), optional :: upd
character(len=*), intent(in), optional :: afmt
class(psb_d_base_sparse_mat), intent(in), optional :: amold
class(psb_d_base_vect_type), intent(in), optional :: vmold
integer(psb_ipk_) :: err_act, nrow,i
character(len=20) :: name='d_diag_precbld'
call psb_erractionsave(err_act)
info = psb_success_
nrow = desc_a%get_local_cols()
if (allocated(prec%d)) then
if (size(prec%d) < nrow) then
deallocate(prec%d,stat=info)
end if
end if
if ((info == psb_success_).and.(.not.allocated(prec%d))) then
allocate(prec%d(nrow), stat=info)
end if
if (info /= psb_success_) then
info = psb_err_alloc_dealloc_
call psb_errpush(info,name)
goto 9999
end if
call a%get_diag(prec%d,info)
if (info /= psb_success_) then
info = psb_err_from_subroutine_
call psb_errpush(info,name, a_err='get_diag')
goto 9999
end if
do i=1,nrow
if (prec%d(i) == dzero) then
prec%d(i) = done
else
prec%d(i) = done/prec%d(i)
endif
end do
allocate(prec%dv,stat=info)
if (info == 0) then
if (present(vmold)) then
allocate(prec%dv%v,mold=vmold,stat=info)
else
allocate(psb_d_base_vect_type :: prec%dv%v,stat=info)
end if
end if
if (info == 0) then
call prec%dv%bld(prec%d)
else
write(0,*) 'Error on precbld ',info
end if
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_d_diag_precbld