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lammps/lib/kokkos/containers/src/impl/Kokkos_StaticCrsGraph_factory.hpp
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Kokkos_StaticCrsGraph_factory.hpp
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/*
//@HEADER
// ************************************************************************
//
// Kokkos v. 2.0
// Copyright (2014) Sandia Corporation
//
// Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
// the U.S. Government retains certain rights in this software.
//
// 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. Neither the name of the Corporation nor the names of the
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY SANDIA CORPORATION "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 SANDIA CORPORATION OR THE
// 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.
//
// Questions? Contact H. Carter Edwards (hcedwar@sandia.gov)
//
// ************************************************************************
//@HEADER
*/
#ifndef KOKKOS_IMPL_STATICCRSGRAPH_FACTORY_HPP
#define KOKKOS_IMPL_STATICCRSGRAPH_FACTORY_HPP
//----------------------------------------------------------------------------
//----------------------------------------------------------------------------
namespace Kokkos {
template< class DataType , class Arg1Type , class Arg2Type , typename SizeType >
inline
typename StaticCrsGraph< DataType , Arg1Type , Arg2Type , SizeType >::HostMirror
create_mirror_view( const StaticCrsGraph<DataType,Arg1Type,Arg2Type,SizeType > & view ,
typename Impl::enable_if< ViewTraits<DataType,Arg1Type,Arg2Type,void>::is_hostspace >::type * = 0 )
{
return view ;
}
template< class DataType , class Arg1Type , class Arg2Type , typename SizeType >
inline
typename StaticCrsGraph< DataType , Arg1Type , Arg2Type , SizeType >::HostMirror
create_mirror( const StaticCrsGraph<DataType,Arg1Type,Arg2Type,SizeType > & view )
{
// Force copy:
//typedef Impl::ViewAssignment< Impl::ViewDefault > alloc ; // unused
typedef StaticCrsGraph< DataType , Arg1Type , Arg2Type , SizeType > staticcrsgraph_type ;
typename staticcrsgraph_type::HostMirror tmp ;
typename staticcrsgraph_type::row_map_type::HostMirror tmp_row_map = create_mirror( view.row_map);
// Allocation to match:
tmp.row_map = tmp_row_map ; // Assignment of 'const' from 'non-const'
tmp.entries = create_mirror( view.entries );
// Deep copy:
deep_copy( tmp_row_map , view.row_map );
deep_copy( tmp.entries , view.entries );
return tmp ;
}
template< class DataType , class Arg1Type , class Arg2Type , typename SizeType >
inline
typename StaticCrsGraph< DataType , Arg1Type , Arg2Type , SizeType >::HostMirror
create_mirror_view( const StaticCrsGraph<DataType,Arg1Type,Arg2Type,SizeType > & view ,
typename Impl::enable_if< ! ViewTraits<DataType,Arg1Type,Arg2Type,void>::is_hostspace >::type * = 0 )
{
return create_mirror( view );
}
} // namespace Kokkos
//----------------------------------------------------------------------------
//----------------------------------------------------------------------------
namespace Kokkos {
template< class StaticCrsGraphType , class InputSizeType >
inline
typename StaticCrsGraphType::staticcrsgraph_type
create_staticcrsgraph( const std::string & label ,
const std::vector< InputSizeType > & input )
{
typedef StaticCrsGraphType output_type ;
//typedef std::vector< InputSizeType > input_type ; // unused
typedef typename output_type::entries_type entries_type ;
typedef View< typename output_type::size_type [] ,
typename output_type::array_layout ,
typename output_type::execution_space > work_type ;
output_type output ;
// Create the row map:
const size_t length = input.size();
{
work_type row_work( "tmp" , length + 1 );
typename work_type::HostMirror row_work_host =
create_mirror_view( row_work );
size_t sum = 0 ;
row_work_host[0] = 0 ;
for ( size_t i = 0 ; i < length ; ++i ) {
row_work_host[i+1] = sum += input[i];
}
deep_copy( row_work , row_work_host );
output.entries = entries_type( label , sum );
output.row_map = row_work ;
}
return output ;
}
//----------------------------------------------------------------------------
template< class StaticCrsGraphType , class InputSizeType >
inline
typename StaticCrsGraphType::staticcrsgraph_type
create_staticcrsgraph( const std::string & label ,
const std::vector< std::vector< InputSizeType > > & input )
{
typedef StaticCrsGraphType output_type ;
typedef typename output_type::entries_type entries_type ;
static_assert( entries_type::rank == 1
, "Graph entries view must be rank one" );
typedef View< typename output_type::size_type [] ,
typename output_type::array_layout ,
typename output_type::execution_space > work_type ;
output_type output ;
// Create the row map:
const size_t length = input.size();
{
work_type row_work( "tmp" , length + 1 );
typename work_type::HostMirror row_work_host =
create_mirror_view( row_work );
size_t sum = 0 ;
row_work_host[0] = 0 ;
for ( size_t i = 0 ; i < length ; ++i ) {
row_work_host[i+1] = sum += input[i].size();
}
deep_copy( row_work , row_work_host );
output.entries = entries_type( label , sum );
output.row_map = row_work ;
}
// Fill in the entries:
{
typename entries_type::HostMirror host_entries =
create_mirror_view( output.entries );
size_t sum = 0 ;
for ( size_t i = 0 ; i < length ; ++i ) {
for ( size_t j = 0 ; j < input[i].size() ; ++j , ++sum ) {
host_entries( sum ) = input[i][j] ;
}
}
deep_copy( output.entries , host_entries );
}
return output ;
}
} // namespace Kokkos
//----------------------------------------------------------------------------
//----------------------------------------------------------------------------
#endif /* #ifndef KOKKOS_IMPL_CRSARRAY_FACTORY_HPP */
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