1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
|
/* Test file for mpfr_get_d
Copyright 1999, 2000, 2001, 2002 Free Software Foundation.
This file is part of the MPFR Library.
The MPFR Library is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or (at your
option) any later version.
The MPFR Library 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 Lesser General Public
License for more details.
You should have received a copy of the GNU Lesser General Public License
along with the MPFR Library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
MA 02111-1307, USA. */
#include <stdio.h>
#include <stdlib.h>
#include <float.h>
#include "gmp.h"
#include "gmp-impl.h"
#include "mpfr.h"
#include "mpfr-impl.h"
#include "mpfr-test.h"
int check_denorms _PROTO ((void));
int
check_denorms ()
{
mp_rnd_t rnd_mode;
mpfr_t x;
double d, d2, dd, f;
int fail = 0, k, n;
mpfr_init2 (x, BITS_PER_MP_LIMB);
rnd_mode = GMP_RNDN;
for (k = -17; k <= 17; k += 2)
{
d = k * DBL_MIN; /* k * 2^(-1022) */
f = 1.0;
mpfr_set_si (x, k, GMP_RNDN);
mpfr_div_2exp (x, x, 1022, GMP_RNDN); /* k * 2^(-1022) */
for (n = 0; n <= 58; n++)
{
d2 = d * f;
dd = mpfr_get_d (x, rnd_mode);
if (d2 != dd) /* should be k * 2^(-1022-n) for n < 53 */
{
fprintf (stderr,
"Wrong result for %d * 2^(%d), rnd_mode %d\n",
k, -1022-n, rnd_mode);
fprintf (stderr, "got %.20e instead of %.20e\n", dd, d2);
fail = 1;
}
f *= 0.5;
mpfr_div_2exp (x, x, 1, GMP_RNDN);
}
}
mpfr_clear (x);
return fail;
}
int
main (void)
{
mpfr_test_init ();
if (check_denorms ())
exit (1);
return 0;
}
|
