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
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
|
/* Test file for mpfr_set_q.
Copyright (C) 2000, 2001 Free Software Foundation, Inc.
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 Library General Public License as published by
the Free Software Foundation; either version 2 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 Library General Public
License for more details.
You should have received a copy of the GNU Library 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 <unistd.h>
#include "gmp.h"
#include "mpfr.h"
void check _PROTO((long int, long int, mp_rnd_t, double));
void
check (long int n, long int d, mp_rnd_t rnd, double y)
{
mpq_t q;
mpfr_t x, t;
double z;
int inexact, compare;
mpfr_init2 (x, 53);
mpfr_init2 (t, mpfr_get_prec (x) + mp_bits_per_limb);
mpq_init (q);
mpq_set_si (q, n, d);
#ifdef TEST
mpfr_set_machine_rnd_mode (rnd);
y = (double) n / d;
#endif
inexact = mpfr_set_q (x, q, rnd);
z = mpfr_get_d (x);
/* check values */
if (y != z)
{
fprintf (stderr, "Error for q=%ld/%lu and rnd=%s\n", n, d,
mpfr_print_rnd_mode (rnd));
fprintf (stderr, "libm.a gives %1.20e, mpfr_set_q gives %1.20e\n", y, z);
exit (1);
}
/* check inexact flag */
if (mpfr_mul_ui (t, x, (d < 0) ? (-d) : d, rnd))
{
fprintf (stderr, "t <- x * d should be exact\n");
exit (1);
}
compare = mpfr_cmp_si (t, n);
if (((inexact == 0) && (compare != 0)) ||
((inexact < 0) && (compare >= 0)) ||
((inexact > 0) && (compare <= 0)))
{
fprintf (stderr, "wrong inexact flag: expected %d, got %d\n", compare,
inexact);
exit (1);
}
mpfr_clear (x);
mpfr_clear (t);
mpq_clear (q);
}
int
main (void)
{
#ifdef TEST
long int i, n;
unsigned long int d;
double y;
unsigned char rnd;
srand48(getpid());
for (i=0;i<1000000;i++) {
n = lrand48();
d = lrand48();
if (lrand48()%2) n = -n;
rnd = lrand48() % 4;
y = (double) n / d;
check(n, d, rnd, y);
}
#endif
check(-1647229822, 40619231, GMP_RNDZ, -4.055295438754120596e1);
check(-148939696, 1673285490, GMP_RNDZ, -8.9010331404953485501e-2);
check(-441322590, 273662545, GMP_RNDZ, -1.6126525096812205362);
check(-1631156895, 1677687197, GMP_RNDU, -9.722652100563177191e-1);
check(2141332571, 3117601, GMP_RNDZ, 6.8685267004982347316e2);
check(75504803, 400207282, GMP_RNDU, 1.8866424074712365155e-1);
check(643562308, 23100894, GMP_RNDD, 2.7858762002890447462e1);
check(632549085, 1831935802, GMP_RNDN, 3.4528998467600230393e-1);
return 0;
}
|
