60 lines
1.9 KiB
C++
60 lines
1.9 KiB
C++
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// Copyright (C) 2003 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 2, 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 COPYING. If not, write to the Free
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// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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// USA.
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// As a special exception, you may use this file as part of a free software
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// library without restriction. Specifically, if other files instantiate
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// templates or use macros or inline functions from this file, or you compile
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// this file and link it with other files to produce an executable, this
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// file does not by itself cause the resulting executable to be covered by
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// the GNU General Public License. This exception does not however
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// invalidate any other reasons why the executable file might be covered by
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// the GNU General Public License.
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#include <complex>
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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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typedef std::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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for (int i = 0; i < 2000; ++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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#if 1
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double u2 = norm(*p);
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#else
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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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#endif
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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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return 0;
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}
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