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/*****************************************************************************
ClockCycleCounter.hpp
Copyright (c) 2003 Laurent de Soras
Please complete the definitions according to your compiler/architecture.
It's not a big deal if it's not possible to get the clock count...
--- Legal stuff ---
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*Tab=3***********************************************************************/
#if defined (stopwatch_ClockCycleCounter_CURRENT_CODEHEADER)
#error Recursive inclusion of ClockCycleCounter code header.
#endif
#define stopwatch_ClockCycleCounter_CURRENT_CODEHEADER
#if ! defined (stopwatch_ClockCycleCounter_CODEHEADER_INCLUDED)
#define stopwatch_ClockCycleCounter_CODEHEADER_INCLUDED
/*\\\ INCLUDE FILES \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\*/
#include "fnc.h"
#include <climits>
namespace stopwatch
{
/*\\\ PUBLIC \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\*/
/*
==============================================================================
Name: start
Description:
Starts the counter.
Throws: Nothing
==============================================================================
*/
void ClockCycleCounter::start ()
{
_best_score = (static_cast <Int64> (1) << (sizeof (Int64) * CHAR_BIT - 2));
const Int64 start_clock = read_clock_counter ();
_start_time = start_clock;
_state = start_clock - _best_score;
}
/*
==============================================================================
Name: stop_lap
Description:
Captures the current time and updates the smallest duration between two
consecutive calls to stop_lap() or the latest start().
start() must have been called at least once before calling this function.
Throws: Nothing
==============================================================================
*/
void ClockCycleCounter::stop_lap ()
{
const Int64 end_clock = read_clock_counter ();
_best_score = min (end_clock - _state, _best_score);
_state = end_clock;
}
/*\\\ PROTECTED \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\*/
/*\\\ PRIVATE \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\*/
Int64 ClockCycleCounter::read_clock_counter ()
{
register Int64 clock_cnt;
#if defined (_MSC_VER)
__asm
{
lea edi, clock_cnt
rdtsc
mov [edi ], eax
mov [edi + 4], edx
}
#elif defined (__GNUC__) && defined (__i386__)
__asm__ __volatile__ ("rdtsc" : "=A" (clock_cnt));
#elif (__MWERKS__) && defined (__POWERPC__)
asm
{
loop:
mftbu clock_cnt@hiword
mftb clock_cnt@loword
mftbu r5
cmpw clock_cnt@hiword,r5
bne loop
}
#endif
return (clock_cnt);
}
} // namespace stopwatch
#endif // stopwatch_ClockCycleCounter_CODEHEADER_INCLUDED
#undef stopwatch_ClockCycleCounter_CURRENT_CODEHEADER
/*\\\ EOF \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\*/
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