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amg4psblas/amgprec/impl/smoother/amg_d_as_smoother_restr_a.f90

170 lines
4.9 KiB
Fortran

!
!
! AMG4PSBLAS version 1.0
! Algebraic Multigrid Package
! based on PSBLAS (Parallel Sparse BLAS version 3.5)
!
! (C) Copyright 2020
!
! Salvatore Filippone
! Pasqua D'Ambra
! Fabio Durastante
!
! 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 AMG4PSBLAS 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 AMG4PSBLAS 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 amg_d_as_smoother_restr_a(sm,x,trans,work,info,data)
use psb_base_mod
use amg_d_as_smoother, amg_protect_nam => amg_d_as_smoother_restr_a
implicit none
class(amg_d_as_smoother_type), intent(inout) :: sm
real(psb_dpk_), intent(inout) :: x(:)
character(len=1),intent(in) :: trans
real(psb_dpk_),target, intent(inout) :: work(:)
integer(psb_ipk_), intent(out) :: info
integer(psb_ipk_), optional, intent(in) :: data
!Local
type(psb_ctxt_type) :: ctxt
integer(psb_ipk_) :: np, me, err_act,isz,int_err(5), data_
character :: trans_
character(len=20) :: name='d_as_smther_restr_a', ch_err
call psb_erractionsave(err_act)
info = psb_success_
ctxt = sm%desc_data%get_context()
call psb_info(ctxt,me,np)
trans_ = psb_toupper(trans)
select case(trans_)
case('N')
case('T')
case('C')
case default
info = psb_err_iarg_invalid_i_
call psb_errpush(info,name)
goto 9999
end select
if (present(data)) then
data_ = data
else
data_ = psb_comm_ext_
end if
if (.not.allocated(sm%sv)) then
info = 1121
call psb_errpush(info,name)
goto 9999
end if
select case(trans_)
case('N')
!
! Get the overlap entries x
!
if (sm%restr == psb_halo_) then
call psb_halo(x,sm%desc_data,info,work=work,data=data_)
if(info /= psb_success_) then
info=psb_err_from_subroutine_
ch_err='psb_halo'
goto 9999
end if
else if (sm%restr /= psb_none_) then
call psb_errpush(psb_err_internal_error_,name,&
&a_err='Invalid amg_sub_restr_')
goto 9999
end if
case('T','C')
!
! With transpose, we have to do it here
!
select case (sm%prol)
case(psb_none_)
!
! Do nothing
case(psb_sum_)
!
! The transpose of sum is halo
!
call psb_halo(x,sm%desc_data,info,work=work,data=data_)
if(info /= psb_success_) then
info=psb_err_from_subroutine_
ch_err='psb_halo'
goto 9999
end if
case(psb_avg_)
!
! Tricky one: first we have to scale the overlap entries,
! which we can do by assignind mode=0, i.e. no communication
! (hence only scaling), then we do the halo
!
call psb_ovrl(x,sm%desc_data,info,&
& update=psb_avg_,work=work,mode=izero)
if(info /= psb_success_) then
info=psb_err_from_subroutine_
ch_err='psb_ovrl'
goto 9999
end if
call psb_halo(x,sm%desc_data,info,work=work,data=data_)
if(info /= psb_success_) then
info=psb_err_from_subroutine_
ch_err='psb_halo'
goto 9999
end if
case default
call psb_errpush(psb_err_internal_error_,name,&
& a_err='Invalid amg_sub_prol_')
goto 9999
end select
case default
info=psb_err_iarg_invalid_i_
int_err(1)=6
ch_err(2:2)=trans
goto 9999
end select
call psb_erractionrestore(err_act)
return
9999 call psb_error_handler(err_act)
return
end subroutine amg_d_as_smoother_restr_a