mirror of
https://github.com/autc04/Retro68.git
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75 lines
1.9 KiB
C++
75 lines
1.9 KiB
C++
// Copyright (C) 2003-2014 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// 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
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License along
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// with this library; see the file COPYING3. If not see
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// <http://www.gnu.org/licenses/>.
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#include <complex>
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#include <testsuite_performance.h>
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// based on libstdc++/5730, use --fast-math
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int main()
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{
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using namespace std;
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using namespace __gnu_test;
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time_counter time;
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resource_counter resource;
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const int iterations = 2000;
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typedef complex<double> complex_type;
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complex_type u[2048];
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for (int i = 0; i < 2048; ++i)
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u[i] = 1.0;
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start_counters(time, resource);
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for (int i = 0; i < iterations; ++i)
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{
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complex_type * p = u;
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for (int j = 0; j < 2048; ++j)
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{
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double u2 = norm(*p);
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double t = u2 * 0.1;
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*p *= complex_type(cos(t), sin(t));
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++p;
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}
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}
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stop_counters(time, resource);
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report_performance(__FILE__, "norm", time, resource);
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clear_counters(time, resource);
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start_counters(time, resource);
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for (int i = 0; i < iterations; ++i)
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{
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complex_type * p = u;
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for (int j = 0; j < 2048; ++j)
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{
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// Shouldn't be slower than the above.
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double ur = real(*p);
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double ui = imag(*p);
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double u2 = ur * ur + ui * ui;
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double t = u2 * 0.1;
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*p *= complex_type(cos(t), sin(t));
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++p;
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}
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}
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stop_counters(time, resource);
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report_performance(__FILE__, "", time, resource);
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return 0;
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}
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