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/*
Copyright (C) 2009 William Hart
This file is part of FLINT.
FLINT is free software: you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License (LGPL) as published
by the Free Software Foundation; either version 3 of the License, or
(at your option) any later version. See <https://www.gnu.org/licenses/>.
*/
#include "test_helpers.h"
#include "ulong_extras.h"
TEST_FUNCTION_START(n_invmod, state)
{
slong ix;
int result;
for (ix = 0; ix < 10000 * flint_test_multiplier(); ix++)
{
ulong 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)
TEST_FUNCTION_FAIL("a = %wu, b = %wu, r = %wd\n", a, b, r);
}
TEST_FUNCTION_END(state);
}