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