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/** @file time_lw_C.cpp
*
* Test C from the paper "Comparison of Polynomial-Oriented CAS" by Robert H.
* Lewis and Michael Wester. */
/*
* GiNaC Copyright (C) 1999-2026 Johannes Gutenberg University Mainz, Germany
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include "ginac.h"
#include "timer.h"
using namespace GiNaC;
#include <iostream>
#include <vector>
using namespace std;
static unsigned test()
{
numeric x(13*17*31);
numeric y(13*19*29);
for (int i=1; i<200; ++i)
gcd(pow(x,300+(i%181)),pow(y,200+(i%183)));
ex lastgcd = gcd(pow(x,300+(200%181)),pow(y,200+(200%183)));
if (lastgcd != numeric("53174994123961114423610399251974962981084780166115806651505844915220196792416194060680805428433601792982500430324916963290494659936522782673704312949880308677990050199363768068005367578752699785180694630122629259539608472261461289805919741933")) {
clog << "gcd(" << x << "^" << 300+(200%181) << ","
<< y << "^" << 200+(200%183) << ") erroneously returned "
<< lastgcd << endl;
return 1;
}
return 0;
}
unsigned time_lw_C()
{
unsigned result = 0;
unsigned count = 0;
timer rolex;
double time = .0;
cout << "timing Lewis-Wester test C (gcd of big integers)" << flush;
rolex.start();
// correct for very small times:
do {
result = test();
++count;
} while ((time=rolex.read())<0.1 && !result);
cout << '.' << flush;
cout << time/count << 's' << endl;
return result;
}
extern void randomify_symbol_serials();
int main(int argc, char** argv)
{
randomify_symbol_serials();
cout << setprecision(2) << showpoint;
return time_lw_C();
}
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