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/* Test mpf_get_d and mpf_set_d.
Copyright 1996, 1999-2001, 2009 Free Software Foundation, Inc.
This file is part of the GNU MP Library test suite.
The GNU MP Library test suite 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 3 of the License,
or (at your option) any later version.
The GNU MP Library test suite 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
the GNU MP Library test suite. If not, see https://www.gnu.org/licenses/. */
#include <stdio.h>
#include <stdlib.h>
#include "gmp-impl.h"
#include "tests.h"
#if defined (__vax) || defined (__vax__)
#define LOW_BOUND 1e-38
#define HIGH_BOUND 8e37
#endif
#if defined (_CRAY) && ! defined (_CRAYIEEE)
/* The range varies mysteriously between Cray version. On an SV1,
the range seem to be 1e-600..1e603, but a cfp (non-ieee) T90
has a much smaller range of 1e-240..1e240. */
#define LOW_BOUND 1e-240
#define HIGH_BOUND 1e240
#endif
#if ! defined (LOW_BOUND)
#define LOW_BOUND 1e-300
#define HIGH_BOUND 1e300
#endif
void
test_denorms (int prc)
{
#ifdef _GMP_IEEE_FLOATS
double d1, d2;
mpf_t f;
int i;
mpf_set_default_prec (prc);
mpf_init (f);
d1 = 1.9;
for (i = 0; i < 820; i++)
{
mpf_set_d (f, d1);
d2 = mpf_get_d (f);
if (d1 != d2)
abort ();
d1 *= 0.4;
}
mpf_clear (f);
#endif
}
int
main (int argc, char **argv)
{
double d, e, r;
mpf_t u, v;
tests_start ();
mpf_init (u);
mpf_init (v);
mpf_set_d (u, LOW_BOUND);
for (d = 2.0 * LOW_BOUND; d < HIGH_BOUND; d *= 1.01)
{
mpf_set_d (v, d);
if (mpf_cmp (u, v) >= 0)
abort ();
e = mpf_get_d (v);
r = e/d;
if (r < 0.99999999999999 || r > 1.00000000000001)
{
fprintf (stderr, "should be one ulp from 1: %.16f\n", r);
abort ();
}
mpf_set (u, v);
}
mpf_clear (u);
mpf_clear (v);
test_denorms (10);
test_denorms (32);
test_denorms (64);
test_denorms (100);
test_denorms (200);
tests_end ();
exit (0);
}
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