Lattice_real_imag.h

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/*************************************************************************************
 
    Grid physics library, www.github.com/paboyle/Grid 
 
    Source file: ./lib/lattice/Lattice_reality.h
 
    Copyright (C) 2015
 
Author: Azusa Yamaguchi <ayamaguc@staffmail.ed.ac.uk>
Author: Peter Boyle <paboyle@ph.ed.ac.uk>
Author: neo <cossu@post.kek.jp>
 
    This program 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 2 of the License, or
    (at your option) any later version.
 
    This program 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 this program; if not, write to the Free Software Foundation, Inc.,
    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 
    See the full license in the file "LICENSE" in the top level distribution directory
*************************************************************************************/
/*  END LEGAL */
#ifndef GRID_LATTICE_REAL_IMAG_H
#define GRID_LATTICE_REAL_IMAG_H
 
 
// FIXME .. this is the sector of the code 
// I am most worried about the directions
// The choice of burying complex in the SIMD
// is making the use of "real" and "imag" very cumbersome
 
NAMESPACE_BEGIN(Grid);
 
template<class vobj> inline Lattice<vobj> real(const Lattice<vobj> &lhs){
  Lattice<vobj> ret(lhs.Grid());
 
  autoView( lhs_v, lhs, AcceleratorRead);
  autoView( ret_v, ret, AcceleratorWrite);
 
  ret.Checkerboard()=lhs.Checkerboard();
  accelerator_for( ss, lhs_v.size(), 1, {
    ret_v[ss] =real(lhs_v[ss]);
  });
  return ret;
};
template<class vobj> inline Lattice<vobj> imag(const Lattice<vobj> &lhs){
  Lattice<vobj> ret(lhs.Grid());
 
  autoView( lhs_v, lhs, AcceleratorRead);
  autoView( ret_v, ret, AcceleratorWrite);
 
  ret.Checkerboard()=lhs.Checkerboard();
  accelerator_for( ss, lhs_v.size(), 1, {
    ret_v[ss] =imag(lhs_v[ss]);
  });
  return ret;
};
 
template<class Expression,typename std::enable_if<is_lattice_expr<Expression>::value,void>::type * = nullptr> 
  auto real(const Expression &expr) -> decltype(real(closure(expr)))        
{                                   
  return real(closure(expr));                   
}
template<class Expression,typename std::enable_if<is_lattice_expr<Expression>::value,void>::type * = nullptr> 
  auto imag(const Expression &expr) -> decltype(imag(closure(expr)))        
{                                   
  return imag(closure(expr));                   
}
 
NAMESPACE_END(Grid);
 
#endif