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/*
Copyright (C) 2011 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 <mpfr.h>
#include "ulong_extras.h"
#include "fmpz.h"
TEST_FUNCTION_START(fmpz_dlog, state)
{
int i, result;
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);
fflush(stdout);
flint_abort();
}
fmpz_clear(x);
mpz_clear(z);
mpfr_clear(r);
}
mpfr_free_cache();
TEST_FUNCTION_END(state);
}