77 lines
2.2 KiB
C
77 lines
2.2 KiB
C
/*=============================================================================
|
|
|
|
This file is part of FLINT.
|
|
|
|
FLINT 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.
|
|
|
|
FLINT 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 FLINT; if not, write to the Free Software
|
|
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
|
|
=============================================================================*/
|
|
/******************************************************************************
|
|
|
|
Copyright (C) 2009 William Hart
|
|
|
|
******************************************************************************/
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <gmp.h>
|
|
#include "flint.h"
|
|
#include "ulong_extras.h"
|
|
|
|
int main(void)
|
|
{
|
|
int i, result;
|
|
FLINT_TEST_INIT(state);
|
|
|
|
flint_printf("gcdinv....");
|
|
fflush(stdout);
|
|
|
|
|
|
|
|
for (i = 0; i < 10000 * flint_test_multiplier(); i++)
|
|
{
|
|
mp_limb_t a, b, c, g, g2, s, t2, t, bits1, bits2, bits3;
|
|
|
|
bits1 = n_randint(state, FLINT_BITS-2) + 2;
|
|
bits2 = n_randint(state, bits1) + 1;
|
|
bits3 = n_randint(state, FLINT_BITS - bits1) + 1;
|
|
|
|
do
|
|
{
|
|
a = n_randtest_bits(state, bits1);
|
|
b = n_randtest_bits(state, bits2);
|
|
} while ((n_gcd(a, b) != UWORD(1)) || (b >= a));
|
|
|
|
c = n_randtest_bits(state, bits3);
|
|
|
|
g = n_xgcd(&s, &t, a*c, b*c);
|
|
g2 = n_gcdinv(&t2, b*c, a*c);
|
|
t %= (a*c);
|
|
t = a*c - t;
|
|
|
|
result = ((g == g2) && (t == t2));
|
|
if (!result)
|
|
{
|
|
flint_printf("FAIL\n");
|
|
flint_printf("a = %wu, b = %wu, c = %wu, g = %wu, g2 = %wu, t = %wd, t2 = %wd\n", a, b, c, g, g2, t, t2);
|
|
abort();
|
|
}
|
|
}
|
|
|
|
FLINT_TEST_CLEANUP(state);
|
|
|
|
flint_printf("PASS\n");
|
|
return 0;
|
|
}
|