60941c2741
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151 lines
3.5 KiB
C++
151 lines
3.5 KiB
C++
/*****************************************************************************
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ClockCycleCounter.hpp
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Copyright (c) 2003 Laurent de Soras
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Please complete the definitions according to your compiler/architecture.
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It's not a big deal if it's not possible to get the clock count...
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--- Legal stuff ---
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*Tab=3***********************************************************************/
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#if defined (stopwatch_ClockCycleCounter_CURRENT_CODEHEADER)
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#error Recursive inclusion of ClockCycleCounter code header.
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#endif
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#define stopwatch_ClockCycleCounter_CURRENT_CODEHEADER
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#if ! defined (stopwatch_ClockCycleCounter_CODEHEADER_INCLUDED)
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#define stopwatch_ClockCycleCounter_CODEHEADER_INCLUDED
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/*\\\ INCLUDE FILES \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\*/
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#include "fnc.h"
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#include <climits>
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namespace stopwatch
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{
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/*\\\ PUBLIC \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\*/
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/*
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==============================================================================
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Name: start
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Description:
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Starts the counter.
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Throws: Nothing
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==============================================================================
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*/
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void ClockCycleCounter::start ()
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{
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_best_score = (static_cast <Int64> (1) << (sizeof (Int64) * CHAR_BIT - 2));
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const Int64 start_clock = read_clock_counter ();
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_start_time = start_clock;
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_state = start_clock - _best_score;
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}
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/*
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==============================================================================
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Name: stop_lap
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Description:
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Captures the current time and updates the smallest duration between two
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consecutive calls to stop_lap() or the latest start().
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start() must have been called at least once before calling this function.
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Throws: Nothing
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==============================================================================
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*/
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void ClockCycleCounter::stop_lap ()
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{
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const Int64 end_clock = read_clock_counter ();
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_best_score = min (end_clock - _state, _best_score);
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_state = end_clock;
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}
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/*\\\ PROTECTED \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\*/
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/*\\\ PRIVATE \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\*/
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Int64 ClockCycleCounter::read_clock_counter ()
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{
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register Int64 clock_cnt;
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#if defined (_MSC_VER)
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__asm
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{
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lea edi, clock_cnt
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rdtsc
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mov [edi ], eax
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mov [edi + 4], edx
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}
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#elif defined (__GNUC__) && defined (__i386__)
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__asm__ __volatile__ ("rdtsc" : "=A" (clock_cnt));
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#elif (__MWERKS__) && defined (__POWERPC__)
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asm
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{
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loop:
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mftbu clock_cnt@hiword
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mftb clock_cnt@loword
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mftbu r5
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cmpw clock_cnt@hiword,r5
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bne loop
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}
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#endif
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return (clock_cnt);
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}
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} // namespace stopwatch
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#endif // stopwatch_ClockCycleCounter_CODEHEADER_INCLUDED
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#undef stopwatch_ClockCycleCounter_CURRENT_CODEHEADER
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/*\\\ EOF \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\*/
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