71 lines
2.0 KiB
C
71 lines
2.0 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("invmod....");
|
||
|
|
fflush(stdout);
|
||
|
|
|
||
|
|
for (i = 0; i < 10000 * flint_test_multiplier(); i++)
|
||
|
|
{
|
||
|
|
mp_limb_t a, b, t, r, binv, ph, pl;
|
||
|
|
|
||
|
|
do
|
||
|
|
{
|
||
|
|
a = n_randtest(state);
|
||
|
|
b = n_randtest(state);
|
||
|
|
} while ((a >= b) || (n_gcd(b, a) != UWORD(1)));
|
||
|
|
|
||
|
|
t = n_invmod(a, b);
|
||
|
|
|
||
|
|
binv = n_preinvert_limb(b);
|
||
|
|
umul_ppmm(ph, pl, t, a);
|
||
|
|
r = n_ll_mod_preinv(ph, pl, b, binv);
|
||
|
|
|
||
|
|
result = (((r == UWORD(0)) && (b == UWORD(1))) || (r == UWORD(1)));
|
||
|
|
if (!result)
|
||
|
|
{
|
||
|
|
flint_printf("FAIL:\n");
|
||
|
|
flint_printf("a = %wu, b = %wu, r = %wd\n", a, b, r);
|
||
|
|
abort();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
FLINT_TEST_CLEANUP(state);
|
||
|
|
|
||
|
|
flint_printf("PASS\n");
|
||
|
|
return 0;
|
||
|
|
}
|