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psblas3/prec/psb_sbjac_aply.f90

159 lines
5.1 KiB
Fortran

!!$
!!$ Parallel Sparse BLAS version 2.2
!!$ (C) Copyright 2006/2007/2008
!!$ Salvatore Filippone University of Rome Tor Vergata
!!$ Alfredo Buttari University of Rome Tor Vergata
!!$
!!$ Redistribution and use in source and binary forms, with or without
!!$ modification, are permitted provided that the following conditions
!!$ are met:
!!$ 1. Redistributions of source code must retain the above copyright
!!$ notice, this list of conditions and the following disclaimer.
!!$ 2. Redistributions in binary form must reproduce the above copyright
!!$ notice, this list of conditions, and the following disclaimer in the
!!$ documentation and/or other materials provided with the distribution.
!!$ 3. The name of the PSBLAS group or the names of its contributors may
!!$ not be used to endorse or promote products derived from this
!!$ software without specific written permission.
!!$
!!$ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
!!$ ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
!!$ TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
!!$ PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE PSBLAS GROUP OR ITS CONTRIBUTORS
!!$ BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
!!$ CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
!!$ SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
!!$ INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
!!$ CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
!!$ ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
!!$ POSSIBILITY OF SUCH DAMAGE.
!!$
!!$
subroutine psb_sbjac_aply(alpha,prec,x,beta,y,desc_data,trans,work,info)
!
! Compute Y <- beta*Y + alpha*K^-1 X
! where K is a a Block Jacobi preconditioner stored in prec
! Note that desc_data may or may not be the same as prec%desc_data,
! but since both are INTENT(IN) this should be legal.
!
use psb_base_mod
use psb_prec_mod, psb_protect_name => psb_sbjac_aply
implicit none
type(psb_desc_type), intent(in) :: desc_data
type(psb_sprec_type), intent(in) :: prec
real(psb_spk_),intent(in) :: x(:)
real(psb_spk_),intent(inout) :: y(:)
real(psb_spk_),intent(in) :: alpha,beta
character(len=1) :: trans
real(psb_spk_),target :: work(:)
integer, intent(out) :: info
! Local variables
integer :: n_row,n_col
real(psb_spk_), pointer :: ww(:), aux(:)
integer :: ictxt,np,me, err_act, int_err(5)
integer :: debug_level, debug_unit
character :: trans_
character(len=20) :: name, ch_err
name='psb_bjac_aply'
info = 0
call psb_erractionsave(err_act)
debug_unit = psb_get_debug_unit()
debug_level = psb_get_debug_level()
ictxt = psb_cd_get_context(desc_data)
call psb_info(ictxt, me, np)
trans_ = psb_toupper(trans)
select case(trans_)
case('N','T','C')
! Ok
case default
call psb_errpush(40,name)
goto 9999
end select
n_row=desc_data%matrix_data(psb_n_row_)
n_col=desc_data%matrix_data(psb_n_col_)
if (n_col <= size(work)) then
ww => work(1:n_col)
if ((4*n_col+n_col) <= size(work)) then
aux => work(n_col+1:)
else
allocate(aux(4*n_col),stat=info)
if (info /= 0) then
call psb_errpush(4010,name,a_err='Allocate')
goto 9999
end if
endif
else
allocate(ww(n_col),aux(4*n_col),stat=info)
if (info /= 0) then
call psb_errpush(4010,name,a_err='Allocate')
goto 9999
end if
endif
select case(prec%iprcparm(psb_f_type_))
case(psb_f_ilu_n_)
select case(trans_)
case('N')
call psb_spsm(sone,prec%av(psb_l_pr_),x,szero,ww,desc_data,info,&
& trans=trans_,scale='L',diag=prec%d,choice=psb_none_,work=aux)
if(info /=0) goto 9999
call psb_spsm(alpha,prec%av(psb_u_pr_),ww,beta,y,desc_data,info,&
& trans=trans_,scale='U',choice=psb_none_, work=aux)
if(info /=0) goto 9999
case('T','C')
call psb_spsm(sone,prec%av(psb_u_pr_),x,szero,ww,desc_data,info,&
& trans=trans_,scale='L',diag=prec%d,choice=psb_none_, work=aux)
if(info /=0) goto 9999
call psb_spsm(alpha,prec%av(psb_l_pr_),ww,beta,y,desc_data,info,&
& trans=trans_,scale='U',choice=psb_none_,work=aux)
if(info /=0) goto 9999
end select
case default
info = 4001
call psb_errpush(info,name,a_err='Invalid factorization')
goto 9999
end select
call psb_halo(y,desc_data,info,data=psb_comm_mov_)
if (n_col <= size(work)) then
if ((4*n_col+n_col) <= size(work)) then
else
deallocate(aux)
endif
else
deallocate(ww,aux)
endif
call psb_erractionrestore(err_act)
return
9999 continue
call psb_errpush(info,name,i_err=int_err,a_err=ch_err)
call psb_erractionrestore(err_act)
if (err_act == psb_act_abort_) then
call psb_error()
return
end if
return
end subroutine psb_sbjac_aply