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1 /* decSingle module header for the decNumber C Library.
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2 Copyright (C) 2005, 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 /* decSingle.h -- Decimal 32-bit format module header */
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28 /* ------------------------------------------------------------------ */
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29 /* Please see decFloats.h for an overview and documentation details. */
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30 /* ------------------------------------------------------------------ */
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31
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32 #if !defined(DECSINGLE)
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33 #define DECSINGLE
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34
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35 #define DECSINGLENAME "decSingle" /* Short name */
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36 #define DECSINGLETITLE "Decimal 32-bit datum" /* Verbose name */
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37 #define DECSINGLEAUTHOR "Mike Cowlishaw" /* Who to blame */
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38
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39 /* parameters for decSingles */
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40 #define DECSINGLE_Bytes 4 /* length */
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41 #define DECSINGLE_Pmax 7 /* maximum precision (digits) */
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42 #define DECSINGLE_Emin -95 /* minimum adjusted exponent */
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43 #define DECSINGLE_Emax 96 /* maximum adjusted exponent */
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44 #define DECSINGLE_EmaxD 3 /* maximum exponent digits */
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45 #define DECSINGLE_Bias 101 /* bias for the exponent */
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46 #define DECSINGLE_String 16 /* maximum string length, +1 */
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47 #define DECSINGLE_EconL 6 /* exponent continuation length */
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48 #define DECSINGLE_Declets 2 /* count of declets */
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49 /* highest biased exponent (Elimit-1) */
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50 #define DECSINGLE_Ehigh (DECSINGLE_Emax + DECSINGLE_Bias - (DECSINGLE_Pmax-1))
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51
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52 /* Required includes */
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53 #include "decContext.h"
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54 #include "decQuad.h"
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55 #include "decDouble.h"
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56
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57 /* The decSingle decimal 32-bit type, accessible by various types */
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58 typedef union {
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59 uint8_t bytes[DECSINGLE_Bytes]; /* fields: 1, 5, 6, 20 bits */
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60 uint16_t shorts[DECSINGLE_Bytes/2];
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61 uint32_t words[DECSINGLE_Bytes/4];
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62 } decSingle;
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63
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64 /* ---------------------------------------------------------------- */
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65 /* Routines -- implemented as decFloat routines in common files */
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66 /* ---------------------------------------------------------------- */
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67
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68 #include "decSingleSymbols.h"
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69
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70 /* Utilities (binary argument(s) or result, extractors, etc.) */
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71 extern decSingle * decSingleFromBCD(decSingle *, int32_t, const uint8_t *, int32_t);
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72 extern decSingle * decSingleFromPacked(decSingle *, int32_t, const uint8_t *);
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73 extern decSingle * decSingleFromString(decSingle *, const char *, decContext *);
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74 extern decSingle * decSingleFromWider(decSingle *, const decDouble *, decContext *);
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75 extern int32_t decSingleGetCoefficient(const decSingle *, uint8_t *);
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76 extern int32_t decSingleGetExponent(const decSingle *);
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77 extern decSingle * decSingleSetCoefficient(decSingle *, const uint8_t *, int32_t);
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78 extern decSingle * decSingleSetExponent(decSingle *, decContext *, int32_t);
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79 extern void decSingleShow(const decSingle *, const char *);
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80 extern int32_t decSingleToBCD(const decSingle *, int32_t *, uint8_t *);
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81 extern char * decSingleToEngString(const decSingle *, char *);
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82 extern int32_t decSingleToPacked(const decSingle *, int32_t *, uint8_t *);
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83 extern char * decSingleToString(const decSingle *, char *);
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84 extern decDouble * decSingleToWider(const decSingle *, decDouble *);
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85 extern decSingle * decSingleZero(decSingle *);
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86
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87 /* (No Arithmetic routines for decSingle) */
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88
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89 /* Non-computational */
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90 extern uint32_t decSingleRadix(const decSingle *);
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91 extern const char * decSingleVersion(void);
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92
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93 /* decNumber conversions; these are implemented as macros so as not */
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94 /* to force a dependency on decimal32 and decNumber in decSingle. */
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95 #define decSingleToNumber(dq, dn) decimal32ToNumber((decimal32 *)(dq), dn)
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96 #define decSingleFromNumber(dq, dn, set) (decSingle *)decimal32FromNumber((decimal32 *)(dq), dn, set)
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97
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98 #endif
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