pqc/external/flint-2.4.3/qsieve/test/t-ll_factor.c

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2014-05-18 22:03:37 +00:00
/*=============================================================================
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, 2011 William Hart
******************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <gmp.h>
#include "flint.h"
#include "ulong_extras.h"
#include "fmpz.h"
#include "qsieve.h"
int main(void)
{
int i, result;
fmpz_t n, t;
mp_limb_t fac1, fac2, fac;
FLINT_TEST_INIT(state);
flint_printf("ll_factor....");
fflush(stdout);
fmpz_init(n);
fmpz_init(t);
for (i = 0; i < 1000; i++) /* Test random n */
{
mp_limb_t hi = 0, lo;
fac1 = n_randprime(state, n_randint(state, FLINT_BITS - 2) + 2, 0);
do {
fac2 = n_randprime(state, n_randint(state, FLINT_BITS - 2) + 2, 0);
} while (fac1 == fac2);
fmpz_set_ui(n, fac1);
fmpz_mul_ui(n, n, fac2);
fmpz_set_ui(t, 1);
fmpz_mul_2exp(t, t, FLINT_BITS);
fmpz_mod(t, n, t);
lo = fmpz_get_ui(t);
fmpz_fdiv_q_2exp(t, n, FLINT_BITS);
hi = fmpz_get_ui(t);
fac = qsieve_ll_factor(hi, lo);
/* multiplier may be up to 6 bits, hence the limitation */
result = ((fac == 0 && fmpz_bits(n) > 2*FLINT_BITS - 6)
|| fac == fac1 || fac == fac2);
if (!result)
{
flint_printf("FAIL: "); fmpz_print(n); flint_printf(" = %wd * %wd\n", fac1, fac2);
flint_printf("fac = %wd, bits = %wd\n", fac, fmpz_bits(n));
abort();
}
}
fmpz_clear(t);
fmpz_clear(n);
FLINT_TEST_CLEANUP(state);
flint_printf("PASS\n");
return 0;
}