Mercurial > hg > CbC > CbC_gcc
annotate include/floatformat.h @ 108:7ad14f446135
add CbC-example/rectypeTest/
author | Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> |
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date | Thu, 14 Jun 2012 20:30:24 +0900 |
parents | f6334be47118 |
children | 04ced10e8804 |
rev | line source |
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0 | 1 /* IEEE floating point support declarations, for GDB, the GNU Debugger. |
67
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
2 Copyright 1991, 1994, 1995, 1997, 2000, 2003, 2005, 2010 |
0 | 3 Free Software Foundation, Inc. |
4 | |
5 This file is part of GDB. | |
6 | |
7 This program is free software; you can redistribute it and/or modify | |
8 it under the terms of the GNU General Public License as published by | |
9 the Free Software Foundation; either version 2 of the License, or | |
10 (at your option) any later version. | |
11 | |
12 This program is distributed in the hope that it will be useful, | |
13 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 GNU General Public License for more details. | |
16 | |
17 You should have received a copy of the GNU General Public License | |
18 along with this program; if not, write to the Free Software | |
19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */ | |
20 | |
21 #if !defined (FLOATFORMAT_H) | |
22 #define FLOATFORMAT_H 1 | |
23 | |
24 #include "ansidecl.h" | |
25 | |
26 /* A floatformat consists of a sign bit, an exponent and a mantissa. Once the | |
27 bytes are concatenated according to the byteorder flag, then each of those | |
28 fields is contiguous. We number the bits with 0 being the most significant | |
29 (i.e. BITS_BIG_ENDIAN type numbering), and specify which bits each field | |
30 contains with the *_start and *_len fields. */ | |
31 | |
32 /* What is the order of the bytes? */ | |
33 | |
34 enum floatformat_byteorders { | |
35 /* Standard little endian byte order. | |
36 EX: 1.2345678e10 => 00 00 80 c5 e0 fe 06 42 */ | |
37 floatformat_little, | |
38 | |
39 /* Standard big endian byte order. | |
40 EX: 1.2345678e10 => 42 06 fe e0 c5 80 00 00 */ | |
41 floatformat_big, | |
42 | |
43 /* Little endian byte order but big endian word order. | |
44 EX: 1.2345678e10 => e0 fe 06 42 00 00 80 c5 */ | |
45 floatformat_littlebyte_bigword, | |
46 | |
47 /* VAX byte order. Little endian byte order with 16-bit words. The | |
48 following example is an illustration of the byte order only; VAX | |
49 doesn't have a fully IEEE compliant floating-point format. | |
50 EX: 1.2345678e10 => 80 c5 00 00 06 42 e0 fe */ | |
51 floatformat_vax | |
52 }; | |
53 | |
54 enum floatformat_intbit { floatformat_intbit_yes, floatformat_intbit_no }; | |
55 | |
56 struct floatformat | |
57 { | |
58 enum floatformat_byteorders byteorder; | |
59 unsigned int totalsize; /* Total size of number in bits */ | |
60 | |
61 /* Sign bit is always one bit long. 1 means negative, 0 means positive. */ | |
62 unsigned int sign_start; | |
63 | |
64 unsigned int exp_start; | |
65 unsigned int exp_len; | |
66 /* Bias added to a "true" exponent to form the biased exponent. It | |
67 is intentionally signed as, otherwize, -exp_bias can turn into a | |
68 very large number (e.g., given the exp_bias of 0x3fff and a 64 | |
69 bit long, the equation (long)(1 - exp_bias) evaluates to | |
70 4294950914) instead of -16382). */ | |
71 int exp_bias; | |
72 /* Exponent value which indicates NaN. This is the actual value stored in | |
73 the float, not adjusted by the exp_bias. This usually consists of all | |
74 one bits. */ | |
75 unsigned int exp_nan; | |
76 | |
77 unsigned int man_start; | |
78 unsigned int man_len; | |
79 | |
80 /* Is the integer bit explicit or implicit? */ | |
81 enum floatformat_intbit intbit; | |
82 | |
83 /* Internal name for debugging. */ | |
84 const char *name; | |
85 | |
86 /* Validator method. */ | |
87 int (*is_valid) (const struct floatformat *fmt, const void *from); | |
88 | |
89 /* Is the format actually the sum of two smaller floating point | |
90 formats (IBM long double, as described in | |
91 gcc/config/rs6000/darwin-ldouble-format)? If so, this is the | |
92 smaller format in question, and the fields sign_start through | |
93 intbit describe the first half. If not, this is NULL. */ | |
94 const struct floatformat *split_half; | |
95 }; | |
96 | |
97 /* floatformats for IEEE single and double, big and little endian. */ | |
98 | |
67
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
99 extern const struct floatformat floatformat_ieee_half_big; |
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
100 extern const struct floatformat floatformat_ieee_half_little; |
0 | 101 extern const struct floatformat floatformat_ieee_single_big; |
102 extern const struct floatformat floatformat_ieee_single_little; | |
103 extern const struct floatformat floatformat_ieee_double_big; | |
104 extern const struct floatformat floatformat_ieee_double_little; | |
105 | |
106 /* floatformat for ARM IEEE double, little endian bytes and big endian words */ | |
107 | |
108 extern const struct floatformat floatformat_ieee_double_littlebyte_bigword; | |
109 | |
110 /* floatformats for VAX. */ | |
111 | |
112 extern const struct floatformat floatformat_vax_f; | |
113 extern const struct floatformat floatformat_vax_d; | |
114 extern const struct floatformat floatformat_vax_g; | |
115 | |
116 /* floatformats for various extendeds. */ | |
117 | |
118 extern const struct floatformat floatformat_i387_ext; | |
119 extern const struct floatformat floatformat_m68881_ext; | |
120 extern const struct floatformat floatformat_i960_ext; | |
121 extern const struct floatformat floatformat_m88110_ext; | |
122 extern const struct floatformat floatformat_m88110_harris_ext; | |
123 extern const struct floatformat floatformat_arm_ext_big; | |
124 extern const struct floatformat floatformat_arm_ext_littlebyte_bigword; | |
125 /* IA-64 Floating Point register spilt into memory. */ | |
126 extern const struct floatformat floatformat_ia64_spill_big; | |
127 extern const struct floatformat floatformat_ia64_spill_little; | |
128 extern const struct floatformat floatformat_ia64_quad_big; | |
129 extern const struct floatformat floatformat_ia64_quad_little; | |
130 /* IBM long double (double+double). */ | |
131 extern const struct floatformat floatformat_ibm_long_double; | |
132 | |
133 /* Convert from FMT to a double. | |
134 FROM is the address of the extended float. | |
135 Store the double in *TO. */ | |
136 | |
137 extern void | |
138 floatformat_to_double (const struct floatformat *, const void *, double *); | |
139 | |
140 /* The converse: convert the double *FROM to FMT | |
141 and store where TO points. */ | |
142 | |
143 extern void | |
144 floatformat_from_double (const struct floatformat *, const double *, void *); | |
145 | |
146 /* Return non-zero iff the data at FROM is a valid number in format FMT. */ | |
147 | |
148 extern int | |
149 floatformat_is_valid (const struct floatformat *fmt, const void *from); | |
150 | |
151 #endif /* defined (FLOATFORMAT_H) */ |