455 lines
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<h1 class="title">ClockCycleCounter.cpp Example File</h1>
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<span class="small-subtitle">demos/spectrum/3rdparty/fftreal/stopwatch/ClockCycleCounter.cpp</span>
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<!-- $$$demos/spectrum/3rdparty/fftreal/stopwatch/ClockCycleCounter.cpp-description -->
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<div class="descr"> <a name="details"></a>
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<pre class="cpp"> <span class="comment">/*****************************************************************************
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ClockCycleCounter.cpp
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Copyright (c) 2003 Laurent de Soras
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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***********************************************************************/</span>
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<span class="preprocessor">#if defined (_MSC_VER)</span>
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<span class="preprocessor">#pragma warning (1 : 4130) // "'operator' : logical operation on address of string constant"</span>
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<span class="preprocessor">#pragma warning (1 : 4223) // "nonstandard extension used : non-lvalue array converted to pointer"</span>
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<span class="preprocessor">#pragma warning (1 : 4705) // "statement has no effect"</span>
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<span class="preprocessor">#pragma warning (1 : 4706) // "assignment within conditional expression"</span>
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<span class="preprocessor">#pragma warning (4 : 4786) // "identifier was truncated to '255' characters in the debug information"</span>
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<span class="preprocessor">#pragma warning (4 : 4800) // "forcing value to bool 'true' or 'false' (performance warning)"</span>
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<span class="preprocessor">#pragma warning (4 : 4355) // "'this' : used in base member initializer list"</span>
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<span class="preprocessor">#endif</span>
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<span class="comment">/*\\\ INCLUDE FILES \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\*/</span>
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<span class="preprocessor">#include "ClockCycleCounter.h"</span>
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<span class="preprocessor">#include <cassert></span>
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<span class="keyword">namespace</span> stopwatch
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{
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<span class="comment">/*\\\ PUBLIC \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\*/</span>
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<span class="comment">/*
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==============================================================================
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Name: ctor
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Description:
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The first object constructed initialise global data. This first
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construction may be a bit slow.
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Throws: Nothing
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==============================================================================
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*/</span>
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ClockCycleCounter<span class="operator">::</span>ClockCycleCounter ()
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: _start_time (<span class="number">0</span>)
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<span class="operator">,</span> _state (<span class="number">0</span>)
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<span class="operator">,</span> _best_score (<span class="operator">-</span><span class="number">1</span>)
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{
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<span class="keyword">if</span> (<span class="operator">!</span> _init_flag)
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{
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<span class="comment">// Should be executed in this order</span>
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compute_clk_mul ();
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compute_measure_time_total ();
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compute_measure_time_lap ();
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<span class="comment">// Restores object state</span>
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_start_time <span class="operator">=</span> <span class="number">0</span>;
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_state <span class="operator">=</span> <span class="number">0</span>;
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_best_score <span class="operator">=</span> <span class="operator">-</span><span class="number">1</span>;
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_init_flag <span class="operator">=</span> <span class="keyword">true</span>;
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}
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}
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<span class="comment">/*
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==============================================================================
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Name: get_time_total
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Description:
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Gives the time elapsed between the latest stop_lap() and start() calls.
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Returns:
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The duration, in clock cycles.
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Throws: Nothing
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==============================================================================
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*/</span>
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Int64 ClockCycleCounter<span class="operator">::</span>get_time_total () <span class="keyword">const</span>
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{
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<span class="keyword">const</span> Int64 duration <span class="operator">=</span> _state <span class="operator">-</span> _start_time;
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assert (duration <span class="operator">></span><span class="operator">=</span> <span class="number">0</span>);
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<span class="keyword">const</span> Int64 t <span class="operator">=</span> max (
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duration <span class="operator">-</span> _measure_time_total<span class="operator">,</span>
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<span class="keyword">static_cast</span> <span class="operator"><</span>Int64<span class="operator">></span> (<span class="number">0</span>)
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);
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<span class="keyword">return</span> (t <span class="operator">*</span> _clk_mul);
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}
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<span class="comment">/*
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==============================================================================
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Name: get_time_best_lap
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Description:
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Gives the smallest time between two consecutive stop_lap() or between
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the stop_lap() and start(). The value is reset by a call to start().
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Call this function only after a stop_lap().
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The time is amputed from the duration of the stop_lap() call itself.
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Returns:
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The smallest duration, in clock cycles.
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Throws: Nothing
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==============================================================================
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*/</span>
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Int64 ClockCycleCounter<span class="operator">::</span>get_time_best_lap () <span class="keyword">const</span>
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{
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assert (_best_score <span class="operator">></span><span class="operator">=</span> <span class="number">0</span>);
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<span class="keyword">const</span> Int64 t1 <span class="operator">=</span> max (
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_best_score <span class="operator">-</span> _measure_time_lap<span class="operator">,</span>
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<span class="keyword">static_cast</span> <span class="operator"><</span>Int64<span class="operator">></span> (<span class="number">0</span>)
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);
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<span class="keyword">const</span> Int64 t <span class="operator">=</span> min (t1<span class="operator">,</span> get_time_total ());
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<span class="keyword">return</span> (t <span class="operator">*</span> _clk_mul);
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}
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<span class="comment">/*\\\ PROTECTED \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\*/</span>
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<span class="comment">/*\\\ PRIVATE \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\*/</span>
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<span class="preprocessor">#if defined (__MACOS__)</span>
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<span class="keyword">static</span> <span class="keyword">inline</span> <span class="type">double</span> stopwatch_ClockCycleCounter_get_time_s ()
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{
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<span class="keyword">const</span> Nanoseconds ns <span class="operator">=</span> AbsoluteToNanoseconds (UpTime ());
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<span class="keyword">return</span> (ns<span class="operator">.</span>hi <span class="operator">*</span> <span class="number">4294967296e</span><span class="operator">-</span><span class="number">9</span> <span class="operator">+</span> ns<span class="operator">.</span>lo <span class="operator">*</span> <span class="number">1e</span><span class="operator">-</span><span class="number">9</span>);
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}
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<span class="preprocessor">#endif // __MACOS__</span>
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<span class="comment">/*
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|
==============================================================================
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Name: compute_clk_mul
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Description:
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This function, only for PowerPC/MacOS computers, computes the multiplier
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required to deduce clock cycles from the internal counter.
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Throws: Nothing
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==============================================================================
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*/</span>
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<span class="type">void</span> ClockCycleCounter<span class="operator">::</span>compute_clk_mul ()
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{
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assert (<span class="operator">!</span> _init_flag);
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<span class="preprocessor">#if defined (__MACOS__)</span>
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|
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<span class="type">long</span> clk_speed_mhz <span class="operator">=</span> CurrentProcessorSpeed ();
|
|
<span class="keyword">const</span> Int64 clk_speed <span class="operator">=</span>
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<span class="keyword">static_cast</span> <span class="operator"><</span>Int64<span class="operator">></span> (clk_speed_mhz) <span class="operator">*</span> (<span class="number">1000L</span><span class="operator">*</span><span class="number">1000L</span>);
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|
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<span class="keyword">const</span> <span class="type">double</span> start_time_s <span class="operator">=</span> stopwatch_ClockCycleCounter_get_time_s ();
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start ();
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|
|
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<span class="keyword">const</span> <span class="type">double</span> duration <span class="operator">=</span> <span class="number">0.01</span>; <span class="comment">// Seconds</span>
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|
<span class="keyword">while</span> (stopwatch_ClockCycleCounter_get_time_s () <span class="operator">-</span> start_time_s <span class="operator"><</span> duration)
|
|
{
|
|
<span class="keyword">continue</span>;
|
|
}
|
|
|
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<span class="keyword">const</span> <span class="type">double</span> stop_time_s <span class="operator">=</span> stopwatch_ClockCycleCounter_get_time_s ();
|
|
stop ();
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<span class="keyword">const</span> <span class="type">double</span> diff_time_s <span class="operator">=</span> stop_time_s <span class="operator">-</span> start_time_s;
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|
<span class="keyword">const</span> <span class="type">double</span> nbr_cycles <span class="operator">=</span> diff_time_s <span class="operator">*</span> <span class="keyword">static_cast</span> <span class="operator"><</span><span class="type">double</span><span class="operator">></span> (clk_speed);
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<span class="keyword">const</span> Int64 diff_time_c <span class="operator">=</span> _state <span class="operator">-</span> _start_time;
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|
<span class="keyword">const</span> <span class="type">double</span> clk_mul <span class="operator">=</span> nbr_cycles <span class="operator">/</span> <span class="keyword">static_cast</span> <span class="operator"><</span><span class="type">double</span><span class="operator">></span> (diff_time_c);
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|
|
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_clk_mul <span class="operator">=</span> round_int (clk_mul);
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|
|
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<span class="preprocessor">#endif // __MACOS__</span>
|
|
}
|
|
|
|
<span class="type">void</span> ClockCycleCounter<span class="operator">::</span>compute_measure_time_total ()
|
|
{
|
|
start ();
|
|
spend_time ();
|
|
|
|
Int64 best_result <span class="operator">=</span> <span class="number">0x7FFFFFFFL</span>; <span class="comment">// Should be enough</span>
|
|
<span class="type">long</span> nbr_tests <span class="operator">=</span> <span class="number">100</span>;
|
|
<span class="keyword">for</span> (<span class="type">long</span> cnt <span class="operator">=</span> <span class="number">0</span>; cnt <span class="operator"><</span> nbr_tests; <span class="operator">+</span><span class="operator">+</span>cnt)
|
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{
|
|
start ();
|
|
stop_lap ();
|
|
<span class="keyword">const</span> Int64 duration <span class="operator">=</span> _state <span class="operator">-</span> _start_time;
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|
best_result <span class="operator">=</span> min (best_result<span class="operator">,</span> duration);
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|
}
|
|
|
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_measure_time_total <span class="operator">=</span> best_result;
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|
}
|
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|
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<span class="comment">/*
|
|
==============================================================================
|
|
Name: compute_measure_time_lap
|
|
Description:
|
|
Computes the duration of one stop_lap() call and store it. It will be used
|
|
later to get the real duration of the measured operation (by subtracting
|
|
the measurement duration).
|
|
Throws: Nothing
|
|
==============================================================================
|
|
*/</span>
|
|
|
|
<span class="type">void</span> ClockCycleCounter<span class="operator">::</span>compute_measure_time_lap ()
|
|
{
|
|
start ();
|
|
spend_time ();
|
|
|
|
<span class="type">long</span> nbr_tests <span class="operator">=</span> <span class="number">10</span>;
|
|
<span class="keyword">for</span> (<span class="type">long</span> cnt <span class="operator">=</span> <span class="number">0</span>; cnt <span class="operator"><</span> nbr_tests; <span class="operator">+</span><span class="operator">+</span>cnt)
|
|
{
|
|
stop_lap ();
|
|
stop_lap ();
|
|
stop_lap ();
|
|
stop_lap ();
|
|
}
|
|
|
|
_measure_time_lap <span class="operator">=</span> _best_score;
|
|
}
|
|
|
|
<span class="type">void</span> ClockCycleCounter<span class="operator">::</span>spend_time ()
|
|
{
|
|
<span class="keyword">const</span> Int64 nbr_clocks <span class="operator">=</span> <span class="number">500</span>; <span class="comment">// Number of clock cycles to spend</span>
|
|
|
|
<span class="keyword">const</span> Int64 start <span class="operator">=</span> read_clock_counter ();
|
|
Int64 current;
|
|
|
|
<span class="keyword">do</span>
|
|
{
|
|
current <span class="operator">=</span> read_clock_counter ();
|
|
}
|
|
<span class="keyword">while</span> ((current <span class="operator">-</span> start) <span class="operator">*</span> _clk_mul <span class="operator"><</span> nbr_clocks);
|
|
}
|
|
|
|
Int64 ClockCycleCounter<span class="operator">::</span>_measure_time_total <span class="operator">=</span> <span class="number">0</span>;
|
|
Int64 ClockCycleCounter<span class="operator">::</span>_measure_time_lap <span class="operator">=</span> <span class="number">0</span>;
|
|
<span class="type">int</span> ClockCycleCounter<span class="operator">::</span>_clk_mul <span class="operator">=</span> <span class="number">1</span>;
|
|
<span class="type">bool</span> ClockCycleCounter<span class="operator">::</span>_init_flag <span class="operator">=</span> <span class="keyword">false</span>;
|
|
|
|
} <span class="comment">// namespace stopwatch</span>
|
|
|
|
<span class="comment">/*\\\ EOF \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\*/</span></pre>
|
|
</div>
|
|
<!-- @@@demos/spectrum/3rdparty/fftreal/stopwatch/ClockCycleCounter.cpp -->
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</div>
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<acronym title="Copyright">©</acronym> 2015 The Qt Company Ltd.
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Documentation contributions included herein are the copyrights of
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<p>
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The documentation provided herein is licensed under the terms of the
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License version 1.3</a> as published by the Free Software Foundation.</p>
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<p>
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Documentation sources may be obtained from <a href="http://www.qt-project.org">
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