Mercurial > hg > CbC > CbC_gcc
annotate include/floatformat.h @ 145:1830386684a0
gcc-9.2.0
| author | anatofuz |
|---|---|
| date | Thu, 13 Feb 2020 11:34:05 +0900 |
| parents | 84e7813d76e9 |
| children |
| rev | line source |
|---|---|
| 0 | 1 /* IEEE floating point support declarations, for GDB, the GNU Debugger. |
| 145 | 2 Copyright (C) 1991-2020 Free Software Foundation, Inc. |
| 0 | 3 |
| 4 This file is part of GDB. | |
| 5 | |
| 6 This program is free software; you can redistribute it and/or modify | |
| 7 it under the terms of the GNU General Public License as published by | |
| 8 the Free Software Foundation; either version 2 of the License, or | |
| 9 (at your option) any later version. | |
| 10 | |
| 11 This program is distributed in the hope that it will be useful, | |
| 12 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 14 GNU General Public License for more details. | |
| 15 | |
| 16 You should have received a copy of the GNU General Public License | |
| 17 along with this program; if not, write to the Free Software | |
| 18 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */ | |
| 19 | |
| 20 #if !defined (FLOATFORMAT_H) | |
| 21 #define FLOATFORMAT_H 1 | |
| 22 | |
| 23 #include "ansidecl.h" | |
| 24 | |
| 111 | 25 #ifdef __cplusplus |
| 26 extern "C" { | |
| 27 #endif | |
| 28 | |
| 0 | 29 /* A floatformat consists of a sign bit, an exponent and a mantissa. Once the |
| 30 bytes are concatenated according to the byteorder flag, then each of those | |
| 31 fields is contiguous. We number the bits with 0 being the most significant | |
| 32 (i.e. BITS_BIG_ENDIAN type numbering), and specify which bits each field | |
| 33 contains with the *_start and *_len fields. */ | |
| 34 | |
| 35 /* What is the order of the bytes? */ | |
| 36 | |
| 37 enum floatformat_byteorders { | |
| 38 /* Standard little endian byte order. | |
| 39 EX: 1.2345678e10 => 00 00 80 c5 e0 fe 06 42 */ | |
| 40 floatformat_little, | |
| 41 | |
| 42 /* Standard big endian byte order. | |
| 43 EX: 1.2345678e10 => 42 06 fe e0 c5 80 00 00 */ | |
| 44 floatformat_big, | |
| 45 | |
| 46 /* Little endian byte order but big endian word order. | |
| 47 EX: 1.2345678e10 => e0 fe 06 42 00 00 80 c5 */ | |
| 48 floatformat_littlebyte_bigword, | |
| 49 | |
| 50 /* VAX byte order. Little endian byte order with 16-bit words. The | |
| 51 following example is an illustration of the byte order only; VAX | |
| 52 doesn't have a fully IEEE compliant floating-point format. | |
| 53 EX: 1.2345678e10 => 80 c5 00 00 06 42 e0 fe */ | |
| 54 floatformat_vax | |
| 55 }; | |
| 56 | |
| 57 enum floatformat_intbit { floatformat_intbit_yes, floatformat_intbit_no }; | |
| 58 | |
| 59 struct floatformat | |
| 60 { | |
| 61 enum floatformat_byteorders byteorder; | |
| 62 unsigned int totalsize; /* Total size of number in bits */ | |
| 63 | |
| 64 /* Sign bit is always one bit long. 1 means negative, 0 means positive. */ | |
| 65 unsigned int sign_start; | |
| 66 | |
| 67 unsigned int exp_start; | |
| 68 unsigned int exp_len; | |
| 69 /* Bias added to a "true" exponent to form the biased exponent. It | |
| 70 is intentionally signed as, otherwize, -exp_bias can turn into a | |
| 71 very large number (e.g., given the exp_bias of 0x3fff and a 64 | |
| 72 bit long, the equation (long)(1 - exp_bias) evaluates to | |
| 73 4294950914) instead of -16382). */ | |
| 74 int exp_bias; | |
| 75 /* Exponent value which indicates NaN. This is the actual value stored in | |
| 76 the float, not adjusted by the exp_bias. This usually consists of all | |
| 77 one bits. */ | |
| 78 unsigned int exp_nan; | |
| 79 | |
| 80 unsigned int man_start; | |
| 81 unsigned int man_len; | |
| 82 | |
| 83 /* Is the integer bit explicit or implicit? */ | |
| 84 enum floatformat_intbit intbit; | |
| 85 | |
| 86 /* Internal name for debugging. */ | |
| 87 const char *name; | |
| 88 | |
| 89 /* Validator method. */ | |
| 90 int (*is_valid) (const struct floatformat *fmt, const void *from); | |
| 91 | |
| 92 /* Is the format actually the sum of two smaller floating point | |
| 93 formats (IBM long double, as described in | |
| 94 gcc/config/rs6000/darwin-ldouble-format)? If so, this is the | |
| 95 smaller format in question, and the fields sign_start through | |
| 96 intbit describe the first half. If not, this is NULL. */ | |
| 97 const struct floatformat *split_half; | |
| 98 }; | |
| 99 | |
| 100 /* floatformats for IEEE single and double, big and little endian. */ | |
| 101 | |
|
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
|
102 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
|
103 extern const struct floatformat floatformat_ieee_half_little; |
| 0 | 104 extern const struct floatformat floatformat_ieee_single_big; |
| 105 extern const struct floatformat floatformat_ieee_single_little; | |
| 106 extern const struct floatformat floatformat_ieee_double_big; | |
| 107 extern const struct floatformat floatformat_ieee_double_little; | |
| 108 | |
| 109 /* floatformat for ARM IEEE double, little endian bytes and big endian words */ | |
| 110 | |
| 111 extern const struct floatformat floatformat_ieee_double_littlebyte_bigword; | |
| 112 | |
| 113 /* floatformats for VAX. */ | |
| 114 | |
| 115 extern const struct floatformat floatformat_vax_f; | |
| 116 extern const struct floatformat floatformat_vax_d; | |
| 117 extern const struct floatformat floatformat_vax_g; | |
| 118 | |
| 119 /* floatformats for various extendeds. */ | |
| 120 | |
| 121 extern const struct floatformat floatformat_i387_ext; | |
| 122 extern const struct floatformat floatformat_m68881_ext; | |
| 123 extern const struct floatformat floatformat_i960_ext; | |
| 124 extern const struct floatformat floatformat_m88110_ext; | |
| 125 extern const struct floatformat floatformat_m88110_harris_ext; | |
| 126 extern const struct floatformat floatformat_arm_ext_big; | |
| 127 extern const struct floatformat floatformat_arm_ext_littlebyte_bigword; | |
| 128 /* IA-64 Floating Point register spilt into memory. */ | |
| 129 extern const struct floatformat floatformat_ia64_spill_big; | |
| 130 extern const struct floatformat floatformat_ia64_spill_little; | |
| 131 extern const struct floatformat floatformat_ia64_quad_big; | |
| 132 extern const struct floatformat floatformat_ia64_quad_little; | |
| 133 /* IBM long double (double+double). */ | |
| 111 | 134 extern const struct floatformat floatformat_ibm_long_double_big; |
| 135 extern const struct floatformat floatformat_ibm_long_double_little; | |
| 0 | 136 |
| 137 /* Convert from FMT to a double. | |
| 138 FROM is the address of the extended float. | |
| 139 Store the double in *TO. */ | |
| 140 | |
| 141 extern void | |
| 142 floatformat_to_double (const struct floatformat *, const void *, double *); | |
| 143 | |
| 144 /* The converse: convert the double *FROM to FMT | |
| 145 and store where TO points. */ | |
| 146 | |
| 147 extern void | |
| 148 floatformat_from_double (const struct floatformat *, const double *, void *); | |
| 149 | |
| 150 /* Return non-zero iff the data at FROM is a valid number in format FMT. */ | |
| 151 | |
| 152 extern int | |
| 153 floatformat_is_valid (const struct floatformat *fmt, const void *from); | |
| 154 | |
| 111 | 155 #ifdef __cplusplus |
| 156 } | |
| 157 #endif | |
| 158 | |
| 0 | 159 #endif /* defined (FLOATFORMAT_H) */ |