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
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
|
/* Generate table of tests in tst-strtod-round.c from
tst-strtod-round-data.
Copyright (C) 2012 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C 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 GNU C 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 GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#define _GNU_SOURCE
#include <assert.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <mpfr.h>
/* Work around incorrect ternary value from mpfr_strtofr
<https://sympa.inria.fr/sympa/arc/mpfr/2012-08/msg00005.html>. */
#define WORKAROUND
static int
string_to_fp (mpfr_t f, const char *s, mpfr_rnd_t rnd)
{
#ifdef WORKAROUND
mpfr_t f2;
mpfr_init2 (f2, 100000);
int r0 = mpfr_strtofr (f2, s, NULL, 0, rnd);
int r = mpfr_set (f, f2, rnd);
mpfr_subnormalize (f, r, rnd);
mpfr_clear (f2);
return r0 | r;
#else
int r = mpfr_strtofr (f, s, NULL, 0, rnd);
mpfr_subnormalize (f, r, rnd);
return r;
#endif
}
static void
print_fp (mpfr_t f, const char *suffix, const char *suffix2)
{
if (mpfr_inf_p (f))
mpfr_printf ("\t%sINFINITY%s", mpfr_signbit (f) ? "-" : "", suffix2);
else
mpfr_printf ("\t%Ra%s%s", f, suffix, suffix2);
}
static void
round_str (const char *s, const char *suffix,
int prec, int emin, int emax, bool need_exact)
{
mpfr_t f;
mpfr_set_default_prec (prec);
mpfr_set_emin (emin);
mpfr_set_emax (emax);
mpfr_init (f);
int r = string_to_fp (f, s, MPFR_RNDD);
if (need_exact)
{
assert (prec == 106 && emin == -1073 && emax == 1024);
/* The maximum value in IBM long double has discontiguous
mantissa bits. */
mpfr_t max_value;
mpfr_init2 (max_value, 107);
mpfr_set_str (max_value, "0x1.fffffffffffff7ffffffffffffcp+1023", 0,
MPFR_RNDN);
if (mpfr_cmpabs (f, max_value) > 0)
r = 1;
mpfr_printf ("\t%s,\n", r ? "false" : "true");
mpfr_clear (max_value);
}
print_fp (f, suffix, ",\n");
string_to_fp (f, s, MPFR_RNDN);
print_fp (f, suffix, ",\n");
string_to_fp (f, s, MPFR_RNDZ);
print_fp (f, suffix, ",\n");
string_to_fp (f, s, MPFR_RNDU);
print_fp (f, suffix, "");
mpfr_clear (f);
}
static void
round_for_all (const char *s)
{
static const struct fmt {
const char *suffix;
int prec;
int emin;
int emax;
bool need_exact;
} formats[7] = {
{ "f", 24, -148, 128, false },
{ "", 53, -1073, 1024, false },
{ "L", 53, -1073, 1024, false },
/* This is the Intel extended float format. */
{ "L", 64, -16444, 16384, false },
/* This is the Motorola extended float format. */
{ "L", 64, -16445, 16384, false },
{ "L", 106, -1073, 1024, true },
{ "L", 113, -16493, 16384, false },
};
mpfr_printf (" TEST (\"");
const char *p;
for (p = s; *p; p++)
{
putchar (*p);
if ((p - s) % 60 == 59 && p[1])
mpfr_printf ("\"\n\t\"");
}
mpfr_printf ("\",\n");
int i;
for (i = 0; i < 7; i++)
{
round_str (s, formats[i].suffix, formats[i].prec,
formats[i].emin, formats[i].emax, formats[i].need_exact);
if (i < 6)
mpfr_printf (",\n");
}
mpfr_printf ("),\n");
}
int
main (void)
{
char *p = NULL;
size_t len;
ssize_t nbytes;
while ((nbytes = getline (&p, &len, stdin)) != -1)
{
if (p[nbytes - 1] == '\n')
p[nbytes - 1] = 0;
round_for_all (p);
free (p);
p = NULL;
}
return 0;
}
|
