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dft_tools/triqs/arrays/blas_lapack/copy.hpp
Olivier Parcollet f2c7d449cc First commit : triqs libs version 1.0 alpha1
for earlier commits, see TRIQS0.x repository.
2013-07-17 19:24:07 +02:00

78 lines
3.1 KiB
C++

/*******************************************************************************
*
* TRIQS: a Toolbox for Research in Interacting Quantum Systems
*
* Copyright (C) 2012 by O. Parcollet
*
* TRIQS is free software: you can redistribute it and/or modify it under the
* terms of the GNU General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any later
* version.
*
* TRIQS is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License along with
* TRIQS. If not, see <http://www.gnu.org/licenses/>.
*
******************************************************************************/
#ifndef TRIQS_ARRAYS_BLAS_LAPACK_COPY_H
#define TRIQS_ARRAYS_BLAS_LAPACK_COPY_H
#include "./tools.hpp"
//#include "./qcache.hpp"
namespace triqs { namespace arrays { namespace blas {
namespace f77 { // overload
extern "C" {
void TRIQS_FORTRAN_MANGLING(dcopy)(const int & N , const double * x, const int& incx, double * y, const int& incy);
void TRIQS_FORTRAN_MANGLING(zcopy)(const int & N , const std::complex<double> * x, const int& incx, std::complex<double> * y, const int& incy);
}
inline void copy (const int & N, const double* x, const int & incx, double* Y, const int & incy) {
TRIQS_FORTRAN_MANGLING(dcopy)(N, x, incx, Y, incy);
}
inline void copy (const int & N, const std::complex<double>* x, const int & incx, std::complex<double>* Y, const int & incy) {
TRIQS_FORTRAN_MANGLING(zcopy)(N, x, incx, Y, incy);
}
}
template< typename VTX, typename VTY>
struct use_blas_copy {
// I do not use cache here...
static constexpr bool are_both_value_view = is_amv_value_or_view_class<VTX>::value && is_amv_value_or_view_class<VTY>::value;
static constexpr bool value = are_both_value_view && is_blas_lapack_type<typename VTX::value_type>::value && have_same_value_type< VTX, VTY>::value;
};
/**
* Blas 1: copy
*/
template< typename VTX, typename VTY>
typename std::enable_if<use_blas_copy<VTX,VTY>::value >::type
copy (VTX const & X, VTY & Y) {
static_assert( is_amv_value_or_view_class<VTX>::value, "blas1 bindings only take vector and vector_view");
static_assert( is_amv_value_or_view_class<VTY>::value, "blas1 bindings only take vector and vector_view");
//if (( X.size() != Y.size()) ) Y.resize(X.size());
//const_qcache<VTX> Cx(X); // mettre la condition a la main
f77::copy(X.size(), X.data_start(), X.stride(), Y.data_start(), Y.stride());
//f77::copy(X.size(), Cx().data_start(), Cx().stride(), Y.data_start(), Y.stride());
}
// generic version
template< typename VTX, typename VTY>
typename std::enable_if< !use_blas_copy<VTX,VTY>::value >::type
copy (VTX const & X, VTY & Y) {
if (X.size() != Y.size()) TRIQS_RUNTIME_ERROR << "blas copy generic : dimension mismatch "<< X.size() << Y.size();
const size_t N = X.size();
for (size_t i = 0; i < N; ++i) Y(i) = X(i);
}
}}}// namespace
#endif