code_path.h

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/** @file
 *  @author Bram de Greve (bram@cocamware.com)
 *  @author Tom De Muer (tom@cocamware.com)
 *
 *  *** BEGIN LICENSE INFORMATION ***
 *  
 *  The contents of this file are subject to the Common Public Attribution License 
 *  Version 1.0 (the "License"); you may not use this file except in compliance with 
 *  the License. You may obtain a copy of the License at 
 *  http://lass.sourceforge.net/cpal-license. The License is based on the 
 *  Mozilla Public License Version 1.1 but Sections 14 and 15 have been added to cover 
 *  use of software over a computer network and provide for limited attribution for 
 *  the Original Developer. In addition, Exhibit A has been modified to be consistent 
 *  with Exhibit B.
 *  
 *  Software distributed under the License is distributed on an "AS IS" basis, WITHOUT 
 *  WARRANTY OF ANY KIND, either express or implied. See the License for the specific 
 *  language governing rights and limitations under the License.
 *  
 *  The Original Code is LASS - Library of Assembled Shared Sources.
 *  
 *  The Initial Developer of the Original Code is Bram de Greve and Tom De Muer.
 *  The Original Developer is the Initial Developer.
 *  
 *  All portions of the code written by the Initial Developer are:
 *  Copyright (C) 2004-2011 the Initial Developer.
 *  All Rights Reserved.
 *  
 *  Contributor(s):
 *
 *  Alternatively, the contents of this file may be used under the terms of the 
 *  GNU General Public License Version 2 or later (the GPL), in which case the 
 *  provisions of GPL are applicable instead of those above.  If you wish to allow use
 *  of your version of this file only under the terms of the GPL and not to allow 
 *  others to use your version of this file under the CPAL, indicate your decision by 
 *  deleting the provisions above and replace them with the notice and other 
 *  provisions required by the GPL License. If you do not delete the provisions above,
 *  a recipient may use your version of this file under either the CPAL or the GPL.
 *  
 *  *** END LICENSE INFORMATION ***
 */
 
 
 
#ifndef LASS_GUARDIAN_OF_INCLUSION_UTIL_CODE_PATH_H
#define LASS_GUARDIAN_OF_INCLUSION_UTIL_CODE_PATH_H
 
#include "util_common.h"
 
#ifdef WIN32        // this is windows only for now
 
namespace lass
{
namespace util
{
    /* Rationale: use a meta-function that does profiling on two versions of the same
    *  functionality and eventually picks one.  This could be labeled dynamic optimizing,
    *  but the programmer has to develop the different incarnations of the algorithm.
    *
    *  A good use is for two different versions of already heavily optimized functions
    *  that perform differently on different (cache) architectures.
    */
 
 
namespace impl
{
    __int64 cycleCount()
    {      
        __int64 cycles;
        _asm rdtsc; // won't work on 486 or below - only pentium or above
        _asm lea ebx,cycles;
        _asm mov [ebx],eax;
        _asm mov [ebx+4],edx;
        return cycles;
    }
}
 
template struct CodePath<typename SelectionPolicy>
{
    template <typename Function> 
    CodePath(Function iFunction1, Function iFunction2)
    {
        SelectionPolicy::initialize(iFunction1, iFunction2);
    }
};
 
}
}
 
#endif
 
#endif
 
// EOF