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1 | /* Copyright (C) 2000-2022 Free Software Foundation, Inc. |
---|---|
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 |
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. |
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 |
12 | Lesser General Public License for more details. |
13 | |
14 | You should have received a copy of the GNU Lesser General Public |
15 | License along with the GNU C Library; if not, see |
16 | <https://www.gnu.org/licenses/>. */ |
17 | |
18 | #ifndef _IEEE754_H |
19 | #define _IEEE754_H 1 |
20 | |
21 | #include <features.h> |
22 | |
23 | #include <bits/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 | # if __FLOAT_WORD_ORDER == __BIG_ENDIAN |
83 | unsigned int mantissa0:20; |
84 | unsigned int exponent:11; |
85 | unsigned int negative:1; |
86 | unsigned int mantissa1:32; |
87 | # else |
88 | /* Together these comprise the mantissa. */ |
89 | unsigned int mantissa1:32; |
90 | unsigned int mantissa0:20; |
91 | unsigned int exponent:11; |
92 | unsigned int negative:1; |
93 | # endif |
94 | #endif /* Little endian. */ |
95 | } ieee; |
96 | |
97 | /* This format makes it easier to see if a NaN is a signalling NaN. */ |
98 | struct |
99 | { |
100 | #if __BYTE_ORDER == __BIG_ENDIAN |
101 | unsigned int negative:1; |
102 | unsigned int exponent:11; |
103 | unsigned int quiet_nan:1; |
104 | /* Together these comprise the mantissa. */ |
105 | unsigned int mantissa0:19; |
106 | unsigned int mantissa1:32; |
107 | #else |
108 | # if __FLOAT_WORD_ORDER == __BIG_ENDIAN |
109 | unsigned int mantissa0:19; |
110 | unsigned int quiet_nan:1; |
111 | unsigned int exponent:11; |
112 | unsigned int negative:1; |
113 | unsigned int mantissa1:32; |
114 | # else |
115 | /* Together these comprise the mantissa. */ |
116 | unsigned int mantissa1:32; |
117 | unsigned int mantissa0:19; |
118 | unsigned int quiet_nan:1; |
119 | unsigned int exponent:11; |
120 | unsigned int negative:1; |
121 | # endif |
122 | #endif |
123 | } ieee_nan; |
124 | }; |
125 | |
126 | #define IEEE754_DOUBLE_BIAS 0x3ff /* Added to exponent. */ |
127 | |
128 | |
129 | union ieee854_long_double |
130 | { |
131 | long double d; |
132 | |
133 | /* This is the IEEE 854 double-extended-precision format. */ |
134 | struct |
135 | { |
136 | #if __BYTE_ORDER == __BIG_ENDIAN |
137 | unsigned int empty0:32; |
138 | unsigned int negative:1; |
139 | unsigned int exponent:15; |
140 | unsigned int empty1:16; |
141 | unsigned int mantissa0:32; |
142 | unsigned int mantissa1:32; |
143 | #endif |
144 | #if __BYTE_ORDER == __LITTLE_ENDIAN |
145 | # if __FLOAT_WORD_ORDER == __BIG_ENDIAN |
146 | unsigned int empty0:32; |
147 | unsigned int exponent:15; |
148 | unsigned int negative:1; |
149 | unsigned int empty1:16; |
150 | unsigned int mantissa0:32; |
151 | unsigned int mantissa1:32; |
152 | # else |
153 | unsigned int mantissa1:32; |
154 | unsigned int mantissa0:32; |
155 | unsigned int exponent:15; |
156 | unsigned int negative:1; |
157 | unsigned int empty1:16; |
158 | unsigned int empty0:32; |
159 | # endif |
160 | #endif |
161 | } ieee; |
162 | |
163 | /* This is for NaNs in the IEEE 854 double-extended-precision format. */ |
164 | struct |
165 | { |
166 | #if __BYTE_ORDER == __BIG_ENDIAN |
167 | unsigned int empty0:32; |
168 | unsigned int negative:1; |
169 | unsigned int exponent:15; |
170 | unsigned int empty1:16; |
171 | unsigned int one:1; |
172 | unsigned int quiet_nan:1; |
173 | unsigned int mantissa0:30; |
174 | unsigned int mantissa1:32; |
175 | #endif |
176 | #if __BYTE_ORDER == __LITTLE_ENDIAN |
177 | # if __FLOAT_WORD_ORDER == __BIG_ENDIAN |
178 | unsigned int empty0:32; |
179 | unsigned int exponent:15; |
180 | unsigned int negative:1; |
181 | unsigned int empty1:16; |
182 | unsigned int mantissa0:30; |
183 | unsigned int quiet_nan:1; |
184 | unsigned int one:1; |
185 | unsigned int mantissa1:32; |
186 | # else |
187 | unsigned int mantissa1:32; |
188 | unsigned int mantissa0:30; |
189 | unsigned int quiet_nan:1; |
190 | unsigned int one:1; |
191 | unsigned int exponent:15; |
192 | unsigned int negative:1; |
193 | unsigned int empty1:16; |
194 | unsigned int empty0:32; |
195 | # endif |
196 | #endif |
197 | } ieee_nan; |
198 | }; |
199 | |
200 | #define IEEE854_LONG_DOUBLE_BIAS 0x3fff |
201 | |
202 | __END_DECLS |
203 | |
204 | #endif /* ieee754.h */ |
205 |
Warning: This file is not a C or C++ file. It does not have highlighting.