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170 lines
4.9 KiB
Fortran
170 lines
4.9 KiB
Fortran
!
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!
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! AMG4PSBLAS version 1.0
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! Algebraic Multigrid Package
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! based on PSBLAS (Parallel Sparse BLAS version 3.5)
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!
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! (C) Copyright 2020
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!
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! Salvatore Filippone
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! Pasqua D'Ambra
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! Fabio Durastante
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!
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! Redistribution and use in source and binary forms, with or without
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! modification, are permitted provided that the following conditions
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! are met:
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! 1. Redistributions of source code must retain the above copyright
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! notice, this list of conditions and the following disclaimer.
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! 2. Redistributions in binary form must reproduce the above copyright
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! notice, this list of conditions, and the following disclaimer in the
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! documentation and/or other materials provided with the distribution.
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! 3. The name of the AMG4PSBLAS group or the names of its contributors may
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! not be used to endorse or promote products derived from this
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! software without specific written permission.
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!
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! THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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! ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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! TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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! PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
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! BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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! CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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! SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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! INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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! CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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! ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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! POSSIBILITY OF SUCH DAMAGE.
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!
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!
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subroutine amg_d_as_smoother_restr_a(sm,x,trans,work,info,data)
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use psb_base_mod
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use amg_d_as_smoother, amg_protect_nam => amg_d_as_smoother_restr_a
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implicit none
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class(amg_d_as_smoother_type), intent(inout) :: sm
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real(psb_dpk_), intent(inout) :: x(:)
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character(len=1),intent(in) :: trans
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real(psb_dpk_),target, intent(inout) :: work(:)
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integer(psb_ipk_), intent(out) :: info
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integer(psb_ipk_), optional, intent(in) :: data
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!Local
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type(psb_ctxt_type) :: ctxt
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integer(psb_ipk_) :: np, me, err_act,isz,int_err(5), data_
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character :: trans_
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character(len=20) :: name='d_as_smther_restr_a', ch_err
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call psb_erractionsave(err_act)
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info = psb_success_
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ctxt = sm%desc_data%get_context()
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call psb_info(ctxt,me,np)
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trans_ = psb_toupper(trans)
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select case(trans_)
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case('N')
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case('T')
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case('C')
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case default
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info = psb_err_iarg_invalid_i_
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call psb_errpush(info,name)
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goto 9999
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end select
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if (present(data)) then
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data_ = data
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else
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data_ = psb_comm_ext_
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end if
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if (.not.allocated(sm%sv)) then
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info = 1121
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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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select case(trans_)
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case('N')
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!
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! Get the overlap entries x
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!
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if (sm%restr == psb_halo_) then
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call psb_halo(x,sm%desc_data,info,work=work,data=data_)
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if(info /= psb_success_) then
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info=psb_err_from_subroutine_
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ch_err='psb_halo'
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goto 9999
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end if
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else if (sm%restr /= psb_none_) then
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call psb_errpush(psb_err_internal_error_,name,&
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&a_err='Invalid amg_sub_restr_')
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goto 9999
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end if
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case('T','C')
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!
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! With transpose, we have to do it here
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!
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select case (sm%prol)
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case(psb_none_)
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!
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! Do nothing
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case(psb_sum_)
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!
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! The transpose of sum is halo
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!
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call psb_halo(x,sm%desc_data,info,work=work,data=data_)
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if(info /= psb_success_) then
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info=psb_err_from_subroutine_
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ch_err='psb_halo'
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goto 9999
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end if
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case(psb_avg_)
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!
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! Tricky one: first we have to scale the overlap entries,
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! which we can do by assignind mode=0, i.e. no communication
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! (hence only scaling), then we do the halo
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!
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call psb_ovrl(x,sm%desc_data,info,&
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& update=psb_avg_,work=work,mode=izero)
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if(info /= psb_success_) then
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info=psb_err_from_subroutine_
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ch_err='psb_ovrl'
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goto 9999
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end if
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call psb_halo(x,sm%desc_data,info,work=work,data=data_)
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if(info /= psb_success_) then
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info=psb_err_from_subroutine_
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ch_err='psb_halo'
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goto 9999
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end if
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case default
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call psb_errpush(psb_err_internal_error_,name,&
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& a_err='Invalid amg_sub_prol_')
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goto 9999
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end select
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case default
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info=psb_err_iarg_invalid_i_
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int_err(1)=6
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ch_err(2:2)=trans
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goto 9999
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end select
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call psb_erractionrestore(err_act)
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return
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9999 call psb_error_handler(err_act)
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return
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end subroutine amg_d_as_smoother_restr_a
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