module psb_d_diagprec
use psb_d_base_prec_mod
type, extends(psb_d_base_prec_type) :: psb_d_diag_prec_type
real(psb_dpk_), allocatable :: d(:)
type(psb_d_vect_type), allocatable :: dv
contains
procedure, pass(prec) :: d_apply_v => psb_d_diag_apply_vect
procedure, pass(prec) :: d_apply => psb_d_diag_apply
procedure, pass(prec) :: precbld => psb_d_diag_precbld
procedure, pass(prec) :: precinit => psb_d_diag_precinit
procedure, pass(prec) :: precseti => psb_d_diag_precseti
procedure, pass(prec) :: precsetr => psb_d_diag_precsetr
procedure, pass(prec) :: precsetc => psb_d_diag_precsetc
procedure, pass(prec) :: precfree => psb_d_diag_precfree
procedure, pass(prec) :: precdescr => psb_d_diag_precdescr
procedure, pass(prec) :: sizeof => psb_d_diag_sizeof
procedure, pass(prec) :: get_nzeros => psb_d_diag_get_nzeros
end type psb_d_diag_prec_type
private :: psb_d_diag_apply, psb_d_diag_precbld, psb_d_diag_precseti,&
& psb_d_diag_precsetr, psb_d_diag_precsetc, psb_d_diag_sizeof,&
& psb_d_diag_precinit, psb_d_diag_precfree, psb_d_diag_precdescr,&
& psb_d_diag_apply_vect, psb_d_diag_get_nzeros
contains
subroutine psb_d_diag_apply_vect(alpha,prec,x,beta,y,desc_data,info,trans,work)
use psb_base_mod
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, intent(out) :: info
character(len=1), optional :: trans
real(psb_dpk_),intent(inout), optional, target :: work(:)
Integer :: 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
!!$ allocate(dw, mold=x, stat=info)
!!$ call dw%bld(x%get_nrows())
!!$ if (.true.) then
!!$ if (info == 0) call dw%mlt(prec%dv,x,info)
!!$ else
!!$ if (info == 0) call dw%axpby(nrow,done,x,dzero,info)
!!$ if (info == 0) call dw%mlt(prec%dv,info)
!!$ end if
!!$ if (info == 0) call y%axpby(nrow,alpha,dw,beta,info)
call y%mlt(alpha,prec%dv,x,beta,info)
!!$ call x%mlt(ww,prec%d(1:nrow),info)
!!$ if (info == 0) call psb_geaxpby(alpha,ww,beta,y,desc_data,info)
!!$ call dw%free(info)
!!$ if (info /= psb_success_) then
!!$ call psb_errpush(psb_err_from_subroutine_,name,a_err='Deallocate')
!!$ goto 9999
!!$ end if
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
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, intent(out) :: info
character(len=1), optional :: trans
real(psb_dpk_),intent(inout), optional, target :: work(:)
Integer :: err_act, nrow
character(len=20) :: name='d_diag_prec_apply'
real(psb_dpk_), pointer :: ww(:)
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 (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 (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
ww(1:nrow) = x(1:nrow)*prec%d(1:nrow)
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_precinit(prec,info)
use psb_base_mod
Implicit None
class(psb_d_diag_prec_type),intent(inout) :: prec
integer, intent(out) :: info
Integer :: err_act, nrow
character(len=20) :: name='d_diag_precinit'
call psb_erractionsave(err_act)
info = psb_success_
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_precinit
subroutine psb_d_diag_precbld(a,desc_a,prec,info,upd,amold,afmt,vmold)
use psb_base_mod
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, 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 :: 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
subroutine psb_d_diag_precseti(prec,what,val,info)
use psb_base_mod
Implicit None
class(psb_d_diag_prec_type),intent(inout) :: prec
integer, intent(in) :: what
integer, intent(in) :: val
integer, intent(out) :: info
Integer :: err_act, nrow
character(len=20) :: name='d_diag_precset'
call psb_erractionsave(err_act)
info = psb_success_
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_precseti
subroutine psb_d_diag_precsetr(prec,what,val,info)
use psb_base_mod
Implicit None
class(psb_d_diag_prec_type),intent(inout) :: prec
integer, intent(in) :: what
real(psb_dpk_), intent(in) :: val
integer, intent(out) :: info
Integer :: err_act, nrow
character(len=20) :: name='d_diag_precset'
call psb_erractionsave(err_act)
info = psb_success_
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_precsetr
subroutine psb_d_diag_precsetc(prec,what,val,info)
use psb_base_mod
Implicit None
class(psb_d_diag_prec_type),intent(inout) :: prec
integer, intent(in) :: what
character(len=*), intent(in) :: val
integer, intent(out) :: info
Integer :: err_act, nrow
character(len=20) :: name='d_diag_precset'
call psb_erractionsave(err_act)
info = psb_success_
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_precsetc
subroutine psb_d_diag_precfree(prec,info)
use psb_base_mod
Implicit None
class(psb_d_diag_prec_type), intent(inout) :: prec
integer, intent(out) :: info
Integer :: err_act, nrow
character(len=20) :: name='d_diag_precset'
call psb_erractionsave(err_act)
info = psb_success_
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_precfree
subroutine psb_d_diag_precdescr(prec,iout)
use psb_base_mod
Implicit None
class(psb_d_diag_prec_type), intent(in) :: prec
integer, intent(in), optional :: iout
Integer :: err_act, nrow, info
character(len=20) :: name='d_diag_precdescr'
integer :: iout_
call psb_erractionsave(err_act)
info = psb_success_
if (present(iout)) then
iout_ = iout
else
iout_ = 6
end if
write(iout_,*) 'Diagonal scaling'
call psb_erractionsave(err_act)
info = psb_success_
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_precdescr
function psb_d_diag_sizeof(prec) result(val)
use psb_base_mod, only: psb_long_int_k_
class(psb_d_diag_prec_type), intent(in) :: prec
integer(psb_long_int_k_) :: val
val = 0
val = val + psb_sizeof_dp * size(prec%d)
return
end function psb_d_diag_sizeof
function psb_d_diag_get_nzeros(prec) result(val)
use psb_base_mod, only: psb_long_int_k_
class(psb_d_diag_prec_type), intent(in) :: prec
integer(psb_long_int_k_) :: val
val = 0
if (allocated(prec%dv)) val = val + prec%dv%get_nrows()
return
end function psb_d_diag_get_nzeros
end module psb_d_diagprec