pqc/external/flint-2.4.3/fmpz/test/t-dlog.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) 2011 Fredrik Johansson
******************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <gmp.h>
#include <mpfr.h>
#include "flint.h"
#include "ulong_extras.h"
#include "fmpz.h"
int
main(void)
{
int i, result;
FLINT_TEST_INIT(state);
flint_printf("dlog....");
fflush(stdout);
for (i = 0; i < 1000 * flint_test_multiplier(); i++)
{
fmpz_t x;
mpz_t z;
mpfr_t r;
double y, w;
fmpz_init(x);
mpz_init(z);
mpfr_init2(r, 53);
fmpz_randtest_not_zero(x, state, 10000);
fmpz_abs(x, x);
y = fmpz_dlog(x);
fmpz_get_mpz(z, x);
mpfr_set_z(r, z, MPFR_RNDN);
mpfr_log(r, r, MPFR_RNDN);
w = mpfr_get_d(r, MPFR_RNDN);
result = (FLINT_ABS(y - w) <= w * 1e-13);
if (!result)
{
flint_printf("FAIL:\n");
flint_printf("x = "), fmpz_print(x), flint_printf("\n");
flint_printf("y = %.20g\n", y);
flint_printf("w = %.20g\n", w);
abort();
}
fmpz_clear(x);
mpz_clear(z);
mpfr_clear(r);
}
mpfr_free_cache();
FLINT_TEST_CLEANUP(state);
flint_printf("PASS\n");
return EXIT_SUCCESS;
}