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
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
|
#ifndef CYGONCE_LIBM_SYS_IEEEFP_H
#define CYGONCE_LIBM_SYS_IEEEFP_H
//===========================================================================
//
// ieeefp.h
//
// Definitions specific to IEEE-754 floating-point format
//
//===========================================================================
// ####ECOSGPLCOPYRIGHTBEGIN####
// -------------------------------------------
// This file is part of eCos, the Embedded Configurable Operating System.
// Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
//
// eCos 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.
//
// eCos 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 eCos; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
//
// As a special exception, if other files instantiate templates or use
// macros or inline functions from this file, or you compile this file
// and link it with other works to produce a work based on this file,
// this file does not by itself cause the resulting work to be covered by
// the GNU General Public License. However the source code for this file
// must still be made available in accordance with section (3) of the GNU
// General Public License v2.
//
// This exception does not invalidate any other reasons why a work based
// on this file might be covered by the GNU General Public License.
// -------------------------------------------
// ####ECOSGPLCOPYRIGHTEND####
//===========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s): jlarmour
// Contributors: jlarmour
// Date: 1998-02-13
// Purpose:
// Description: Definitions specific to IEEE-754 floating-point format
// Usage: #include <sys/ieeefp.h>
//
//####DESCRIPTIONEND####
//
//===========================================================================
// CONFIGURATION
#include <pkgconf/libm.h> // Configuration header
// Include the Math library?
#ifdef CYGPKG_LIBM
// INCLUDES
#include <cyg/infra/cyg_type.h> // Common type definitions and support
// including endian-ness
#if (CYG_BYTEORDER == CYG_MSBFIRST) // Big endian
// Note: there do not seem to be any current machines which are Big Endian but
// have a mixed up double layout.
typedef union
{
cyg_int32 asi32[2];
cyg_int64 asi64;
double value;
struct
{
unsigned int sign : 1;
unsigned int exponent: 11;
unsigned int fraction0:4;
unsigned int fraction1:16;
unsigned int fraction2:16;
unsigned int fraction3:16;
} number;
struct
{
unsigned int sign : 1;
unsigned int exponent: 11;
unsigned int quiet:1;
unsigned int function0:3;
unsigned int function1:16;
unsigned int function2:16;
unsigned int function3:16;
} nan;
struct
{
cyg_uint32 msw;
cyg_uint32 lsw;
} parts;
} Cyg_libm_ieee_double_shape_type;
typedef union
{
cyg_int32 asi32;
float value;
struct
{
unsigned int sign : 1;
unsigned int exponent: 8;
unsigned int fraction0: 7;
unsigned int fraction1: 16;
} number;
struct
{
unsigned int sign:1;
unsigned int exponent:8;
unsigned int quiet:1;
unsigned int function0:6;
unsigned int function1:16;
} nan;
} Cyg_libm_ieee_float_shape_type;
#else // Little endian
typedef union
{
cyg_int32 asi32[2];
cyg_int64 asi64;
double value;
struct
{
#if (CYG_DOUBLE_BYTEORDER == CYG_MSBFIRST) // Big endian
unsigned int fraction1:16;
unsigned int fraction0: 4;
unsigned int exponent :11;
unsigned int sign : 1;
unsigned int fraction3:16;
unsigned int fraction2:16;
#else
unsigned int fraction3:16;
unsigned int fraction2:16;
unsigned int fraction1:16;
unsigned int fraction0: 4;
unsigned int exponent :11;
unsigned int sign : 1;
#endif
} number;
struct
{
#if (CYG_DOUBLE_BYTEORDER == CYG_MSBFIRST) // Big endian
unsigned int function1:16;
unsigned int function0:3;
unsigned int quiet:1;
unsigned int exponent: 11;
unsigned int sign : 1;
unsigned int function3:16;
unsigned int function2:16;
#else
unsigned int function3:16;
unsigned int function2:16;
unsigned int function1:16;
unsigned int function0:3;
unsigned int quiet:1;
unsigned int exponent: 11;
unsigned int sign : 1;
#endif
} nan;
struct
{
#if (CYG_DOUBLE_BYTEORDER == CYG_MSBFIRST) // Big endian
cyg_uint32 msw;
cyg_uint32 lsw;
#else
cyg_uint32 lsw;
cyg_uint32 msw;
#endif
} parts;
} Cyg_libm_ieee_double_shape_type;
typedef union
{
cyg_int32 asi32;
float value;
struct
{
unsigned int fraction0: 7;
unsigned int fraction1: 16;
unsigned int exponent: 8;
unsigned int sign : 1;
} number;
struct
{
unsigned int function1:16;
unsigned int function0:6;
unsigned int quiet:1;
unsigned int exponent:8;
unsigned int sign:1;
} nan;
} Cyg_libm_ieee_float_shape_type;
#endif // little-endian
#endif // ifdef CYGPKG_LIBM
#endif // CYGONCE_LIBM_SYS_IEEEFP_H multiple inclusion protection
// EOF ieeefp.h
|
