cvd/cpu_hacks.h

#ifndef CVD_CPU_HACKS_H
#define CVD_CPU_HACKS_H
/*                       
        This file is part of the CVD Library.

        Copyright (C) 2005 The Authors

        This library is free software; you can redistribute it and/or
        modify it under the terms of the GNU Lesser General Public
        License as published by the Free Software Foundation; either
        version 2.1 of the License, or (at your option) any later version.

        This library 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
        Lesser General Public License for more details.

        You should have received a copy of the GNU Lesser General Public
        License along with this library; if not, write to the Free Software
        Foundation, Inc., 
    51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
*/


#include <cvd/config.h>

#if CVD_HAVE_FENV_H
    #include <fenv.h>
#endif

#if CVD_HAVE_MMXEXT
    #include <xmmintrin.h>
#endif

namespace CVD
{


    inline void enableFPE();

    #ifndef DOXYGEN_IGNORE_INTERNAL
        #ifdef CVD_HAVE_FENV_H
            inline void enableFPE() 
            { 
                feclearexcept(FE_ALL_EXCEPT);
                feenableexcept(FE_DIVBYZERO|FE_INVALID); 
            }
        #else
            inline void enableFPE() 
            { 
            }
        #endif
    #endif

    template<int I> inline void prefetch(const void* ptr);
    
    inline void prefetch(const void* ptr);


    #ifndef DOXYGEN_IGNORE_INTERNAL
        #ifdef  CVD_HAVE_MMXEXT 
            template<int I> inline void prefetch(const void* ptr)
            {
                _mm_prefetch((char *)ptr, _MM_HINT_NTA);
            }

            template<> inline void prefetch<0>(const void* ptr)
            {
                _mm_prefetch((char *)ptr, _MM_HINT_T0);
            }
            
            template<> inline void prefetch<1>(const void* ptr)
            {
                _mm_prefetch((char *)ptr, _MM_HINT_T1);
            }

            template<> inline void prefetch<2>(const void* ptr)
            {
                _mm_prefetch((char *)ptr, _MM_HINT_T2);
            }
        
            inline void prefetch(const void* ptr)
            {
                prefetch<-1>(ptr);
            }

        #else
            template<int i> inline void prefetch(const void*){}
            inline void prefetch(const void*){}

        #endif
    #endif
}
#endif

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