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/*
Copyright (C) 2026 Fredrik Johansson
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_mod_barrett, state)
{
int i, result;
for (i = 0; i < 100000 * flint_test_multiplier(); i++)
{
ulong n, x, npre, r1, r2, r3;
n = n_randtest_not_zero(state);
npre = (n == 1) ? UWORD_MAX : n_barrett_precomp(n);
x = n_randtest(state);
r1 = n_mod_barrett(x, n, npre);
r2 = n_mod_barrett_lazy(x, n, npre);
r3 = x % n;
result = (r1 == r3) && (r2 == r3 || (r3 <= UWORD_MAX - n && r2 == r3 + n));
if (!result)
TEST_FUNCTION_FAIL(
"n = %wu, npre = %wu, x = %wu\n"
"r1 = %wu, r2 = %wu, r3 = %wu\n",
n, npre, x, r1, r2);
}
TEST_FUNCTION_END(state);
}