denormals.hxx

/*
 * Author: Harry van Haaren 2013
 *         harryhaaren@gmail.com
 * 
 * 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.
 * 
 */

#ifndef LUPPP_DENORMALS_H
#define LUPPP_DENORMALS_H

#include <iostream>

#ifdef __SSE__
/* On Intel set FZ (Flush to Zero) and DAZ (Denormals Are Zero)
   flags to avoid costly denormals */
#ifdef __SSE3__
#include <pmmintrin.h>
inline void AVOIDDENORMALS()
{
  //std::cout << "Denormals: FZ DAZ using SSE3" << std::endl;
  _MM_SET_FLUSH_ZERO_MODE(_MM_FLUSH_ZERO_ON);
  _MM_SET_DENORMALS_ZERO_MODE(_MM_DENORMALS_ZERO_ON);
}
#else
#include <xmmintrin.h>
inline void AVOIDDENORMALS()
{
  //std::cout << "Denormals: FZ" << std::endl;
  _MM_SET_FLUSH_ZERO_MODE(_MM_FLUSH_ZERO_ON);
}
#endif //__SSE3__

#else
inline void AVOIDDENORMALS()
{
  std::cout << "Denormals: Warning! No protection" << std::endl;
}
#endif //__SSE__

#endif // LUPPP_DENORMALS_H