source: Sophya/trunk/SophyaLib/UnixMac/src/ieee754.h@ 2845

Last change on this file since 2845 was 683, checked in by ansari, 26 years ago

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[683]1/* Copyright (C) 1992, 1995, 1996 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 Library General Public License as
6 published by the Free Software Foundation; either version 2 of the
7 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 Library General Public License for more details.
13
14 You should have received a copy of the GNU Library General Public
15 License along with the GNU C Library; see the file COPYING.LIB. If not,
16 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 Boston, MA 02111-1307, USA. */
18
19#ifndef _IEEE754_H
20
21#define _IEEE754_H 1
22
23#define __LITTLE_ENDIAN 1
24#define __BIG_ENDIAN 0
25#define __BYTE_ORDER __BIG_ENDIAN
26
27
28union ieee754_float
29 {
30 float f;
31
32 /* This is the IEEE 754 single-precision format. */
33 struct
34 {
35#if __BYTE_ORDER == __BIG_ENDIAN
36 unsigned int negative:1;
37 unsigned int exponent:8;
38 unsigned int mantissa:23;
39#endif /* Big endian. */
40#if __BYTE_ORDER == __LITTLE_ENDIAN
41 unsigned int mantissa:23;
42 unsigned int exponent:8;
43 unsigned int negative:1;
44#endif /* Little endian. */
45 } ieee;
46
47 /* This format makes it easier to see if a NaN is a signalling NaN. */
48 struct
49 {
50#if __BYTE_ORDER == __BIG_ENDIAN
51 unsigned int negative:1;
52 unsigned int exponent:8;
53 unsigned int quiet_nan:1;
54 unsigned int mantissa:22;
55#endif /* Big endian. */
56#if __BYTE_ORDER == __LITTLE_ENDIAN
57 unsigned int mantissa:22;
58 unsigned int quiet_nan:1;
59 unsigned int exponent:8;
60 unsigned int negative:1;
61#endif /* Little endian. */
62 } ieee_nan;
63 };
64
65#define IEEE754_FLOAT_BIAS 0x7f /* Added to exponent. */
66
67
68union ieee754_double
69 {
70 double d;
71
72 /* This is the IEEE 754 double-precision format. */
73 struct
74 {
75#if __BYTE_ORDER == __BIG_ENDIAN
76 unsigned int negative:1;
77 unsigned int exponent:11;
78 /* Together these comprise the mantissa. */
79 unsigned int mantissa0:20;
80 unsigned int mantissa1:32;
81#endif /* Big endian. */
82#if __BYTE_ORDER == __LITTLE_ENDIAN
83 /* Together these comprise the mantissa. */
84 unsigned int mantissa1:32;
85 unsigned int mantissa0:20;
86 unsigned int exponent:11;
87 unsigned int negative:1;
88#endif /* Little endian. */
89 } ieee;
90
91 /* This format makes it easier to see if a NaN is a signalling NaN. */
92 struct
93 {
94#if __BYTE_ORDER == __BIG_ENDIAN
95 unsigned int negative:1;
96 unsigned int exponent:11;
97 unsigned int quiet_nan:1;
98 /* Together these comprise the mantissa. */
99 unsigned int mantissa0:19;
100 unsigned int mantissa1:32;
101#else
102 /* Together these comprise the mantissa. */
103 unsigned int mantissa1:32;
104 unsigned int mantissa0:19;
105 unsigned int quiet_nan:1;
106 unsigned int exponent:11;
107 unsigned int negative:1;
108#endif
109 } ieee_nan;
110 };
111
112#define IEEE754_DOUBLE_BIAS 0x3ff /* Added to exponent. */
113
114
115union ieee854_long_double
116 {
117 long double d;
118
119 /* This is the IEEE 854 double-extended-precision format. */
120 struct
121 {
122#if __BYTE_ORDER == __BIG_ENDIAN
123 unsigned int negative:1;
124 unsigned int exponent:15;
125 unsigned int empty:16;
126 unsigned int mantissa0:32;
127 unsigned int mantissa1:32;
128#endif
129#if __BYTE_ORDER == __LITTLE_ENDIAN
130 unsigned int mantissa1:32;
131 unsigned int mantissa0:32;
132 unsigned int exponent:15;
133 unsigned int negative:1;
134 unsigned int empty:16;
135#endif
136 } ieee;
137
138 /* This is for NaNs in the IEEE 854 double-extended-precision format. */
139 struct
140 {
141#if __BYTE_ORDER == __BIG_ENDIAN
142 unsigned int negative:1;
143 unsigned int exponent:15;
144 unsigned int empty:16;
145 unsigned int one:1;
146 unsigned int quiet_nan:1;
147 unsigned int mantissa0:30;
148 unsigned int mantissa1:32;
149#endif
150#if __BYTE_ORDER == __LITTLE_ENDIAN
151 unsigned int mantissa1:32;
152 unsigned int mantissa0:30;
153 unsigned int quiet_nan:1;
154 unsigned int one:1;
155 unsigned int exponent:15;
156 unsigned int negative:1;
157 unsigned int empty:16;
158#endif
159 } ieee_nan;
160 };
161
162#define IEEE854_LONG_DOUBLE_BIAS 0x3fff
163
164
165#endif /* ieee754.h */
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