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1 /* Decimal 128-bit format module header for the decNumber C Library.
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2 Copyright (C) 2005, 2007, 2009 Free Software Foundation, Inc.
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3 Contributed by IBM Corporation. Author Mike Cowlishaw.
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4
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5 This file is part of GCC.
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6
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7 GCC is free software; you can redistribute it and/or modify it under
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8 the terms of the GNU General Public License as published by the Free
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9 Software Foundation; either version 3, or (at your option) any later
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10 version.
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11
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12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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15 for more details.
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16
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17 Under Section 7 of GPL version 3, you are granted additional
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18 permissions described in the GCC Runtime Library Exception, version
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19 3.1, as published by the Free Software Foundation.
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20
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21 You should have received a copy of the GNU General Public License and
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22 a copy of the GCC Runtime Library Exception along with this program;
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23 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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24 <http://www.gnu.org/licenses/>. */
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25
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26 /* ------------------------------------------------------------------ */
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27 /* Decimal 128-bit format module header */
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28 /* ------------------------------------------------------------------ */
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29
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30 #if !defined(DECIMAL128)
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31 #define DECIMAL128
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32 #define DEC128NAME "decimal128" /* Short name */
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33 #define DEC128FULLNAME "Decimal 128-bit Number" /* Verbose name */
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34 #define DEC128AUTHOR "Mike Cowlishaw" /* Who to blame */
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35
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36 /* parameters for decimal128s */
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37 #define DECIMAL128_Bytes 16 /* length */
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38 #define DECIMAL128_Pmax 34 /* maximum precision (digits) */
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39 #define DECIMAL128_Emax 6144 /* maximum adjusted exponent */
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40 #define DECIMAL128_Emin -6143 /* minimum adjusted exponent */
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41 #define DECIMAL128_Bias 6176 /* bias for the exponent */
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42 #define DECIMAL128_String 43 /* maximum string length, +1 */
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43 #define DECIMAL128_EconL 12 /* exp. continuation length */
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44 /* highest biased exponent (Elimit-1) */
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45 #define DECIMAL128_Ehigh (DECIMAL128_Emax+DECIMAL128_Bias-DECIMAL128_Pmax+1)
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46
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47 /* check enough digits, if pre-defined */
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48 #if defined(DECNUMDIGITS)
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49 #if (DECNUMDIGITS<DECIMAL128_Pmax)
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50 #error decimal128.h needs pre-defined DECNUMDIGITS>=34 for safe use
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51 #endif
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52 #endif
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53
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54 #ifndef DECNUMDIGITS
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55 #define DECNUMDIGITS DECIMAL128_Pmax /* size if not already defined*/
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56 #endif
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57 #ifndef DECNUMBER
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58 #include "decNumber.h" /* context and number library */
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59 #endif
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60
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61 /* Decimal 128-bit type, accessible by bytes */
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62 typedef struct {
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63 uint8_t bytes[DECIMAL128_Bytes]; /* decimal128: 1, 5, 12, 110 bits*/
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64 } decimal128;
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65
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66 /* special values [top byte excluding sign bit; last two bits are */
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67 /* don't-care for Infinity on input, last bit don't-care for NaN] */
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68 #if !defined(DECIMAL_NaN)
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69 #define DECIMAL_NaN 0x7c /* 0 11111 00 NaN */
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70 #define DECIMAL_sNaN 0x7e /* 0 11111 10 sNaN */
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71 #define DECIMAL_Inf 0x78 /* 0 11110 00 Infinity */
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72 #endif
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73
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74 #include "decimal128Local.h"
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75
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76 /* ---------------------------------------------------------------- */
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77 /* Routines */
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78 /* ---------------------------------------------------------------- */
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79
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80 #include "decimal128Symbols.h"
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81
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82 /* String conversions */
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83 decimal128 * decimal128FromString(decimal128 *, const char *, decContext *);
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84 char * decimal128ToString(const decimal128 *, char *);
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85 char * decimal128ToEngString(const decimal128 *, char *);
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86
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87 /* decNumber conversions */
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88 decimal128 * decimal128FromNumber(decimal128 *, const decNumber *,
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89 decContext *);
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90 decNumber * decimal128ToNumber(const decimal128 *, decNumber *);
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91
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92 /* Format-dependent utilities */
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93 uint32_t decimal128IsCanonical(const decimal128 *);
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94 decimal128 * decimal128Canonical(decimal128 *, const decimal128 *);
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95
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96 #endif
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