nkeynes@1265 | 1 | /* IEEE floating point support declarations, for GDB, the GNU Debugger.
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nkeynes@1265 | 2 | Copyright 1991, 1994, 1995, 1997, 2000, 2003, 2005, 2010
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nkeynes@1265 | 3 | Free Software Foundation, Inc.
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nkeynes@1265 | 4 |
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nkeynes@1265 | 5 | This file is part of GDB.
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nkeynes@1265 | 6 |
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nkeynes@1265 | 7 | This program is free software; you can redistribute it and/or modify
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nkeynes@1265 | 8 | it under the terms of the GNU General Public License as published by
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nkeynes@1265 | 9 | the Free Software Foundation; either version 2 of the License, or
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nkeynes@1265 | 10 | (at your option) any later version.
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nkeynes@1265 | 11 |
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nkeynes@1265 | 12 | This program is distributed in the hope that it will be useful,
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nkeynes@1265 | 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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nkeynes@1265 | 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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nkeynes@1265 | 15 | GNU General Public License for more details.
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nkeynes@1265 | 16 |
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nkeynes@1265 | 17 | You should have received a copy of the GNU General Public License
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nkeynes@1265 | 18 | along with this program; if not, write to the Free Software
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nkeynes@1265 | 19 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */
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nkeynes@1265 | 20 |
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nkeynes@1265 | 21 | #if !defined (FLOATFORMAT_H)
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nkeynes@1265 | 22 | #define FLOATFORMAT_H 1
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nkeynes@1265 | 23 |
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nkeynes@1265 | 24 | #include "ansidecl.h"
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nkeynes@1265 | 25 |
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nkeynes@1265 | 26 | /* A floatformat consists of a sign bit, an exponent and a mantissa. Once the
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nkeynes@1265 | 27 | bytes are concatenated according to the byteorder flag, then each of those
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nkeynes@1265 | 28 | fields is contiguous. We number the bits with 0 being the most significant
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nkeynes@1265 | 29 | (i.e. BITS_BIG_ENDIAN type numbering), and specify which bits each field
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nkeynes@1265 | 30 | contains with the *_start and *_len fields. */
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nkeynes@1265 | 31 |
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nkeynes@1265 | 32 | /* What is the order of the bytes? */
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nkeynes@1265 | 33 |
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nkeynes@1265 | 34 | enum floatformat_byteorders {
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nkeynes@1265 | 35 | /* Standard little endian byte order.
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nkeynes@1265 | 36 | EX: 1.2345678e10 => 00 00 80 c5 e0 fe 06 42 */
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nkeynes@1265 | 37 | floatformat_little,
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nkeynes@1265 | 38 |
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nkeynes@1265 | 39 | /* Standard big endian byte order.
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nkeynes@1265 | 40 | EX: 1.2345678e10 => 42 06 fe e0 c5 80 00 00 */
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nkeynes@1265 | 41 | floatformat_big,
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nkeynes@1265 | 42 |
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nkeynes@1265 | 43 | /* Little endian byte order but big endian word order.
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nkeynes@1265 | 44 | EX: 1.2345678e10 => e0 fe 06 42 00 00 80 c5 */
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nkeynes@1265 | 45 | floatformat_littlebyte_bigword,
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nkeynes@1265 | 46 |
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nkeynes@1265 | 47 | /* VAX byte order. Little endian byte order with 16-bit words. The
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nkeynes@1265 | 48 | following example is an illustration of the byte order only; VAX
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nkeynes@1265 | 49 | doesn't have a fully IEEE compliant floating-point format.
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nkeynes@1265 | 50 | EX: 1.2345678e10 => 80 c5 00 00 06 42 e0 fe */
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nkeynes@1265 | 51 | floatformat_vax
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nkeynes@1265 | 52 | };
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nkeynes@1265 | 53 |
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nkeynes@1265 | 54 | enum floatformat_intbit { floatformat_intbit_yes, floatformat_intbit_no };
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nkeynes@1265 | 55 |
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nkeynes@1265 | 56 | struct floatformat
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nkeynes@1265 | 57 | {
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nkeynes@1265 | 58 | enum floatformat_byteorders byteorder;
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nkeynes@1265 | 59 | unsigned int totalsize; /* Total size of number in bits */
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nkeynes@1265 | 60 |
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nkeynes@1265 | 61 | /* Sign bit is always one bit long. 1 means negative, 0 means positive. */
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nkeynes@1265 | 62 | unsigned int sign_start;
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nkeynes@1265 | 63 |
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nkeynes@1265 | 64 | unsigned int exp_start;
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nkeynes@1265 | 65 | unsigned int exp_len;
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nkeynes@1265 | 66 | /* Bias added to a "true" exponent to form the biased exponent. It
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nkeynes@1265 | 67 | is intentionally signed as, otherwize, -exp_bias can turn into a
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nkeynes@1265 | 68 | very large number (e.g., given the exp_bias of 0x3fff and a 64
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nkeynes@1265 | 69 | bit long, the equation (long)(1 - exp_bias) evaluates to
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nkeynes@1265 | 70 | 4294950914) instead of -16382). */
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nkeynes@1265 | 71 | int exp_bias;
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nkeynes@1265 | 72 | /* Exponent value which indicates NaN. This is the actual value stored in
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nkeynes@1265 | 73 | the float, not adjusted by the exp_bias. This usually consists of all
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nkeynes@1265 | 74 | one bits. */
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nkeynes@1265 | 75 | unsigned int exp_nan;
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nkeynes@1265 | 76 |
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nkeynes@1265 | 77 | unsigned int man_start;
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nkeynes@1265 | 78 | unsigned int man_len;
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nkeynes@1265 | 79 |
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nkeynes@1265 | 80 | /* Is the integer bit explicit or implicit? */
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nkeynes@1265 | 81 | enum floatformat_intbit intbit;
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nkeynes@1265 | 82 |
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nkeynes@1265 | 83 | /* Internal name for debugging. */
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nkeynes@1265 | 84 | const char *name;
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nkeynes@1265 | 85 |
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nkeynes@1265 | 86 | /* Validator method. */
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nkeynes@1265 | 87 | int (*is_valid) (const struct floatformat *fmt, const void *from);
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nkeynes@1265 | 88 |
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nkeynes@1265 | 89 | /* Is the format actually the sum of two smaller floating point
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nkeynes@1265 | 90 | formats (IBM long double, as described in
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nkeynes@1265 | 91 | gcc/config/rs6000/darwin-ldouble-format)? If so, this is the
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nkeynes@1265 | 92 | smaller format in question, and the fields sign_start through
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nkeynes@1265 | 93 | intbit describe the first half. If not, this is NULL. */
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nkeynes@1265 | 94 | const struct floatformat *split_half;
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nkeynes@1265 | 95 | };
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nkeynes@1265 | 96 |
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nkeynes@1265 | 97 | /* floatformats for IEEE single and double, big and little endian. */
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nkeynes@1265 | 98 |
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nkeynes@1265 | 99 | extern const struct floatformat floatformat_ieee_half_big;
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nkeynes@1265 | 100 | extern const struct floatformat floatformat_ieee_half_little;
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nkeynes@1265 | 101 | extern const struct floatformat floatformat_ieee_single_big;
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nkeynes@1265 | 102 | extern const struct floatformat floatformat_ieee_single_little;
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nkeynes@1265 | 103 | extern const struct floatformat floatformat_ieee_double_big;
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nkeynes@1265 | 104 | extern const struct floatformat floatformat_ieee_double_little;
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nkeynes@1265 | 105 |
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nkeynes@1265 | 106 | /* floatformat for ARM IEEE double, little endian bytes and big endian words */
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nkeynes@1265 | 107 |
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nkeynes@1265 | 108 | extern const struct floatformat floatformat_ieee_double_littlebyte_bigword;
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nkeynes@1265 | 109 |
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nkeynes@1265 | 110 | /* floatformats for VAX. */
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nkeynes@1265 | 111 |
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nkeynes@1265 | 112 | extern const struct floatformat floatformat_vax_f;
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nkeynes@1265 | 113 | extern const struct floatformat floatformat_vax_d;
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nkeynes@1265 | 114 | extern const struct floatformat floatformat_vax_g;
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nkeynes@1265 | 115 |
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nkeynes@1265 | 116 | /* floatformats for various extendeds. */
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nkeynes@1265 | 117 |
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nkeynes@1265 | 118 | extern const struct floatformat floatformat_i387_ext;
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nkeynes@1265 | 119 | extern const struct floatformat floatformat_m68881_ext;
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nkeynes@1265 | 120 | extern const struct floatformat floatformat_i960_ext;
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nkeynes@1265 | 121 | extern const struct floatformat floatformat_m88110_ext;
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nkeynes@1265 | 122 | extern const struct floatformat floatformat_m88110_harris_ext;
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nkeynes@1265 | 123 | extern const struct floatformat floatformat_arm_ext_big;
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nkeynes@1265 | 124 | extern const struct floatformat floatformat_arm_ext_littlebyte_bigword;
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nkeynes@1265 | 125 | /* IA-64 Floating Point register spilt into memory. */
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nkeynes@1265 | 126 | extern const struct floatformat floatformat_ia64_spill_big;
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nkeynes@1265 | 127 | extern const struct floatformat floatformat_ia64_spill_little;
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nkeynes@1265 | 128 | extern const struct floatformat floatformat_ia64_quad_big;
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nkeynes@1265 | 129 | extern const struct floatformat floatformat_ia64_quad_little;
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nkeynes@1265 | 130 | /* IBM long double (double+double). */
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nkeynes@1265 | 131 | extern const struct floatformat floatformat_ibm_long_double;
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nkeynes@1265 | 132 |
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nkeynes@1265 | 133 | /* Convert from FMT to a double.
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nkeynes@1265 | 134 | FROM is the address of the extended float.
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nkeynes@1265 | 135 | Store the double in *TO. */
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nkeynes@1265 | 136 |
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nkeynes@1265 | 137 | extern void
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nkeynes@1265 | 138 | floatformat_to_double (const struct floatformat *, const void *, double *);
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nkeynes@1265 | 139 |
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nkeynes@1265 | 140 | /* The converse: convert the double *FROM to FMT
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nkeynes@1265 | 141 | and store where TO points. */
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nkeynes@1265 | 142 |
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nkeynes@1265 | 143 | extern void
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nkeynes@1265 | 144 | floatformat_from_double (const struct floatformat *, const double *, void *);
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nkeynes@1265 | 145 |
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nkeynes@1265 | 146 | /* Return non-zero iff the data at FROM is a valid number in format FMT. */
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nkeynes@1265 | 147 |
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nkeynes@1265 | 148 | extern int
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nkeynes@1265 | 149 | floatformat_is_valid (const struct floatformat *fmt, const void *from);
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nkeynes@1265 | 150 |
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nkeynes@1265 | 151 | #endif /* defined (FLOATFORMAT_H) */
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