]>
Commit | Line | Data |
---|---|---|
d4697bc9 | 1 | /* Copyright (C) 1992-2014 Free Software Foundation, Inc. |
09bf6406 UD |
2 | This file is part of the GNU C Library. |
3 | ||
4 | The GNU C Library is free software; you can redistribute it and/or | |
41bdb6e2 AJ |
5 | modify it under the terms of the GNU Lesser General Public |
6 | License as published by the Free Software Foundation; either | |
7 | version 2.1 of the License, or (at your option) any later version. | |
09bf6406 UD |
8 | |
9 | The GNU C Library is distributed in the hope that it will be useful, | |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
41bdb6e2 | 12 | Lesser General Public License for more details. |
09bf6406 | 13 | |
41bdb6e2 | 14 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
15 | License along with the GNU C Library; if not, see |
16 | <http://www.gnu.org/licenses/>. */ | |
09bf6406 UD |
17 | |
18 | #ifndef _IEEE754_H | |
19 | ||
20 | #define _IEEE754_H 1 | |
21 | #include <features.h> | |
22 | ||
23 | #include <endian.h> | |
24 | ||
25 | __BEGIN_DECLS | |
26 | ||
27 | union ieee754_float | |
28 | { | |
29 | float f; | |
30 | ||
31 | /* This is the IEEE 754 single-precision format. */ | |
32 | struct | |
33 | { | |
34 | #if __BYTE_ORDER == __BIG_ENDIAN | |
35 | unsigned int negative:1; | |
36 | unsigned int exponent:8; | |
37 | unsigned int mantissa:23; | |
38 | #endif /* Big endian. */ | |
39 | #if __BYTE_ORDER == __LITTLE_ENDIAN | |
40 | unsigned int mantissa:23; | |
41 | unsigned int exponent:8; | |
42 | unsigned int negative:1; | |
43 | #endif /* Little endian. */ | |
44 | } ieee; | |
45 | ||
46 | /* This format makes it easier to see if a NaN is a signalling NaN. */ | |
47 | struct | |
48 | { | |
49 | #if __BYTE_ORDER == __BIG_ENDIAN | |
50 | unsigned int negative:1; | |
51 | unsigned int exponent:8; | |
52 | unsigned int quiet_nan:1; | |
53 | unsigned int mantissa:22; | |
54 | #endif /* Big endian. */ | |
55 | #if __BYTE_ORDER == __LITTLE_ENDIAN | |
56 | unsigned int mantissa:22; | |
57 | unsigned int quiet_nan:1; | |
58 | unsigned int exponent:8; | |
59 | unsigned int negative:1; | |
60 | #endif /* Little endian. */ | |
61 | } ieee_nan; | |
62 | }; | |
63 | ||
64 | #define IEEE754_FLOAT_BIAS 0x7f /* Added to exponent. */ | |
65 | ||
66 | ||
67 | union ieee754_double | |
68 | { | |
69 | double d; | |
70 | ||
71 | /* This is the IEEE 754 double-precision format. */ | |
72 | struct | |
73 | { | |
74 | #if __BYTE_ORDER == __BIG_ENDIAN | |
75 | unsigned int negative:1; | |
76 | unsigned int exponent:11; | |
77 | /* Together these comprise the mantissa. */ | |
78 | unsigned int mantissa0:20; | |
79 | unsigned int mantissa1:32; | |
80 | #endif /* Big endian. */ | |
81 | #if __BYTE_ORDER == __LITTLE_ENDIAN | |
82 | /* Together these comprise the mantissa. */ | |
83 | unsigned int mantissa1:32; | |
84 | unsigned int mantissa0:20; | |
85 | unsigned int exponent:11; | |
86 | unsigned int negative:1; | |
87 | #endif /* Little endian. */ | |
88 | } ieee; | |
89 | ||
90 | /* This format makes it easier to see if a NaN is a signalling NaN. */ | |
91 | struct | |
92 | { | |
93 | #if __BYTE_ORDER == __BIG_ENDIAN | |
94 | unsigned int negative:1; | |
95 | unsigned int exponent:11; | |
96 | unsigned int quiet_nan:1; | |
97 | /* Together these comprise the mantissa. */ | |
98 | unsigned int mantissa0:19; | |
99 | unsigned int mantissa1:32; | |
100 | #else | |
101 | /* Together these comprise the mantissa. */ | |
102 | unsigned int mantissa1:32; | |
103 | unsigned int mantissa0:19; | |
104 | unsigned int quiet_nan:1; | |
105 | unsigned int exponent:11; | |
106 | unsigned int negative:1; | |
107 | #endif | |
108 | } ieee_nan; | |
109 | }; | |
110 | ||
111 | #define IEEE754_DOUBLE_BIAS 0x3ff /* Added to exponent. */ | |
112 | ||
113 | ||
114 | union ieee854_long_double | |
115 | { | |
116 | long double d; | |
117 | ||
118 | /* This is the IEEE 854 quad-precision format. */ | |
119 | struct | |
120 | { | |
121 | #if __BYTE_ORDER == __BIG_ENDIAN | |
122 | unsigned int negative:1; | |
123 | unsigned int exponent:15; | |
124 | /* Together these comprise the mantissa. */ | |
125 | unsigned int mantissa0:16; | |
126 | unsigned int mantissa1:32; | |
127 | unsigned int mantissa2:32; | |
128 | unsigned int mantissa3:32; | |
129 | #endif /* Big endian. */ | |
130 | #if __BYTE_ORDER == __LITTLE_ENDIAN | |
131 | /* Together these comprise the mantissa. */ | |
132 | unsigned int mantissa3:32; | |
133 | unsigned int mantissa2:32; | |
134 | unsigned int mantissa1:32; | |
135 | unsigned int mantissa0:16; | |
136 | unsigned int exponent:15; | |
137 | unsigned int negative:1; | |
138 | #endif /* Little endian. */ | |
139 | } ieee; | |
140 | ||
141 | /* This format makes it easier to see if a NaN is a signalling NaN. */ | |
142 | struct | |
143 | { | |
144 | #if __BYTE_ORDER == __BIG_ENDIAN | |
145 | unsigned int negative:1; | |
146 | unsigned int exponent:15; | |
147 | unsigned int quiet_nan:1; | |
148 | /* Together these comprise the mantissa. */ | |
149 | unsigned int mantissa0:15; | |
150 | unsigned int mantissa1:32; | |
151 | unsigned int mantissa2:32; | |
152 | unsigned int mantissa3:32; | |
153 | #else | |
154 | /* Together these comprise the mantissa. */ | |
155 | unsigned int mantissa3:32; | |
156 | unsigned int mantissa2:32; | |
157 | unsigned int mantissa1:32; | |
158 | unsigned int mantissa0:15; | |
159 | unsigned int quiet_nan:1; | |
160 | unsigned int exponent:15; | |
161 | unsigned int negative:1; | |
162 | #endif | |
163 | } ieee_nan; | |
164 | }; | |
165 | ||
166 | #define IEEE854_LONG_DOUBLE_BIAS 0x3fff /* Added to exponent. */ | |
167 | ||
168 | __END_DECLS | |
169 | ||
170 | #endif /* ieee754.h */ |