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
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
|
/* Test of signbit() substitute.
Copyright (C) 2007 Free Software Foundation, Inc.
This program 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 2, or (at your option)
any later version.
This program 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 this program; if not, write to the Free Software Foundation,
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
/* Written by Bruno Haible <bruno@clisp.org>, 2007. */
#include <config.h>
#include <math.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#define ASSERT(expr) \
do \
{ \
if (!(expr)) \
{ \
fprintf (stderr, "%s:%d: assertion failed\n", __FILE__, __LINE__); \
abort (); \
} \
} \
while (0)
float zerof = 0.0f;
double zerod = 0.0;
long double zerol = 0.0L;
static void
test_signbitf ()
{
/* Finite values. */
ASSERT (!signbit (3.141f));
ASSERT (!signbit (3.141e30f));
ASSERT (!signbit (3.141e-30f));
ASSERT (signbit (-2.718f));
ASSERT (signbit (-2.718e30f));
ASSERT (signbit (-2.718e-30f));
/* Infinite values. */
ASSERT (!signbit (1.0f / 0.0f));
ASSERT (signbit (-1.0f / 0.0f));
/* Quiet NaN. */
(void) signbit (zerof / zerof);
#if defined FLT_EXPBIT0_WORD && defined FLT_EXPBIT0_BIT
/* Signalling NaN. */
{
#define NWORDS \
((sizeof (float) + sizeof (unsigned int) - 1) / sizeof (unsigned int))
typedef union { float value; unsigned int word[NWORDS]; } memory_float;
memory_float m;
m.value = zerof / zerof;
# if FLT_EXPBIT0_BIT > 0
m.word[FLT_EXPBIT0_WORD] ^= (unsigned int) 1 << (FLT_EXPBIT0_BIT - 1);
# else
m.word[FLT_EXPBIT0_WORD + (FLT_EXPBIT0_WORD < NWORDS / 2 ? 1 : - 1)]
^= (unsigned int) 1 << (sizeof (unsigned int) * CHAR_BIT - 1);
# endif
if (FLT_EXPBIT0_WORD < NWORDS / 2)
m.word[FLT_EXPBIT0_WORD + 1] |= (unsigned int) 1 << FLT_EXPBIT0_BIT;
else
m.word[0] |= (unsigned int) 1;
(void) signbit (m.value);
#undef NWORDS
}
#endif
}
static void
test_signbitd ()
{
/* Finite values. */
ASSERT (!signbit (3.141));
ASSERT (!signbit (3.141e30));
ASSERT (!signbit (3.141e-30));
ASSERT (signbit (-2.718));
ASSERT (signbit (-2.718e30));
ASSERT (signbit (-2.718e-30));
/* Infinite values. */
ASSERT (!signbit (1.0 / 0.0));
ASSERT (signbit (-1.0 / 0.0));
/* Quiet NaN. */
(void) signbit (zerod / zerod);
#if defined DBL_EXPBIT0_WORD && defined DBL_EXPBIT0_BIT
/* Signalling NaN. */
{
#define NWORDS \
((sizeof (double) + sizeof (unsigned int) - 1) / sizeof (unsigned int))
typedef union { double value; unsigned int word[NWORDS]; } memory_double;
memory_double m;
m.value = zerod / zerod;
# if DBL_EXPBIT0_BIT > 0
m.word[DBL_EXPBIT0_WORD] ^= (unsigned int) 1 << (DBL_EXPBIT0_BIT - 1);
# else
m.word[DBL_EXPBIT0_WORD + (DBL_EXPBIT0_WORD < NWORDS / 2 ? 1 : - 1)]
^= (unsigned int) 1 << (sizeof (unsigned int) * CHAR_BIT - 1);
# endif
m.word[DBL_EXPBIT0_WORD + (DBL_EXPBIT0_WORD < NWORDS / 2 ? 1 : - 1)]
|= (unsigned int) 1 << DBL_EXPBIT0_BIT;
(void) signbit (m.value);
#undef NWORDS
}
#endif
}
static void
test_signbitl ()
{
/* Finite values. */
ASSERT (!signbit (3.141L));
ASSERT (!signbit (3.141e30L));
ASSERT (!signbit (3.141e-30L));
ASSERT (signbit (-2.718L));
ASSERT (signbit (-2.718e30L));
ASSERT (signbit (-2.718e-30L));
/* Infinite values. */
ASSERT (!signbit (1.0L / 0.0L));
ASSERT (signbit (-1.0L / 0.0L));
/* Quiet NaN. */
(void) signbit (zerol / zerol);
#if defined LDBL_EXPBIT0_WORD && defined LDBL_EXPBIT0_BIT
/* Signalling NaN. */
{
#define NWORDS \
((sizeof (long double) + sizeof (unsigned int) - 1) / sizeof (unsigned int))
typedef union { long double value; unsigned int word[NWORDS]; } memory_long_double;
memory_long_double m;
m.value = zerol / zerol;
# if LDBL_EXPBIT0_BIT > 0
m.word[LDBL_EXPBIT0_WORD] ^= (unsigned int) 1 << (LDBL_EXPBIT0_BIT - 1);
# else
m.word[LDBL_EXPBIT0_WORD + (LDBL_EXPBIT0_WORD < NWORDS / 2 ? 1 : - 1)]
^= (unsigned int) 1 << (sizeof (unsigned int) * CHAR_BIT - 1);
# endif
m.word[LDBL_EXPBIT0_WORD + (LDBL_EXPBIT0_WORD < NWORDS / 2 ? 1 : - 1)]
|= (unsigned int) 1 << LDBL_EXPBIT0_BIT;
(void) signbit (m.value);
#undef NWORDS
}
#endif
}
int
main ()
{
test_signbitf ();
test_signbitd ();
test_signbitl ();
return 0;
}
|
