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1 /* Decimal number arithmetic 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 Number arithmetic module header */
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28 /* ------------------------------------------------------------------ */
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29
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30 #if !defined(DECNUMBER)
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31 #define DECNUMBER
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32 #define DECNAME "decNumber" /* Short name */
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33 #define DECFULLNAME "Decimal Number Module" /* Verbose name */
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34 #define DECAUTHOR "Mike Cowlishaw" /* Who to blame */
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35
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36 #if !defined(DECCONTEXT)
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37 #include "decContext.h"
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38 #endif
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39
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40 /* Bit settings for decNumber.bits */
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41 #define DECNEG 0x80 /* Sign; 1=negative, 0=positive or zero */
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42 #define DECINF 0x40 /* 1=Infinity */
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43 #define DECNAN 0x20 /* 1=NaN */
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44 #define DECSNAN 0x10 /* 1=sNaN */
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45 /* The remaining bits are reserved; they must be 0 */
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46 #define DECSPECIAL (DECINF|DECNAN|DECSNAN) /* any special value */
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47
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48 /* Define the decNumber data structure. The size and shape of the */
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49 /* units array in the structure is determined by the following */
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50 /* constant. This must not be changed without recompiling the */
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51 /* decNumber library modules. */
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52
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53 #define DECDPUN 3 /* DECimal Digits Per UNit [must be >0 */
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54 /* and <10; 3 or powers of 2 are best]. */
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55
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56 /* DECNUMDIGITS is the default number of digits that can be held in */
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57 /* the structure. If undefined, 1 is assumed and it is assumed */
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58 /* that the structure will be immediately followed by extra space, */
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59 /* as required. DECNUMDIGITS is always >0. */
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60 #if !defined(DECNUMDIGITS)
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61 #define DECNUMDIGITS 1
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62 #endif
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63
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64 /* The size (integer data type) of each unit is determined by the */
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65 /* number of digits it will hold. */
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66 #if DECDPUN<=2
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67 #define decNumberUnit uint8_t
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68 #elif DECDPUN<=4
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69 #define decNumberUnit uint16_t
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70 #else
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71 #define decNumberUnit uint32_t
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72 #endif
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73 /* The number of units needed is ceil(DECNUMDIGITS/DECDPUN) */
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74 #define DECNUMUNITS ((DECNUMDIGITS+DECDPUN-1)/DECDPUN)
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75
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76 /* The data structure... */
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77 typedef struct {
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78 int32_t digits; /* Count of digits in the coefficient; >0 */
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79 int32_t exponent; /* Unadjusted exponent, unbiased, in */
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80 /* range: -1999999997 through 999999999 */
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81 uint8_t bits; /* Indicator bits (see above) */
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82 /* Coefficient, from least significant unit */
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83 decNumberUnit lsu[DECNUMUNITS];
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84 } decNumber;
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85
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86 /* Notes: */
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87 /* 1. If digits is > DECDPUN then there will one or more */
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88 /* decNumberUnits immediately following the first element of lsu.*/
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89 /* These contain the remaining (more significant) digits of the */
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90 /* number, and may be in the lsu array, or may be guaranteed by */
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91 /* some other mechanism (such as being contained in another */
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92 /* structure, or being overlaid on dynamically allocated */
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93 /* storage). */
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94 /* */
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95 /* Each integer of the coefficient (except potentially the last) */
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96 /* contains DECDPUN digits (e.g., a value in the range 0 through */
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97 /* 99999999 if DECDPUN is 8, or 0 through 999 if DECDPUN is 3). */
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98 /* */
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99 /* 2. A decNumber converted to a string may need up to digits+14 */
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100 /* characters. The worst cases (non-exponential and exponential */
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101 /* formats) are -0.00000{9...}# and -9.{9...}E+999999999# */
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102 /* (where # is '\0') */
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103
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104
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105 /* ---------------------------------------------------------------- */
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106 /* decNumber public functions and macros */
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107 /* ---------------------------------------------------------------- */
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108
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109 #include "decNumberSymbols.h"
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110
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111 /* Conversions */
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112 decNumber * decNumberFromInt32(decNumber *, int32_t);
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113 decNumber * decNumberFromUInt32(decNumber *, uint32_t);
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114 decNumber * decNumberFromString(decNumber *, const char *, decContext *);
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115 char * decNumberToString(const decNumber *, char *);
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116 char * decNumberToEngString(const decNumber *, char *);
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117 uint32_t decNumberToUInt32(const decNumber *, decContext *);
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118 int32_t decNumberToInt32(const decNumber *, decContext *);
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119 uint8_t * decNumberGetBCD(const decNumber *, uint8_t *);
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120 decNumber * decNumberSetBCD(decNumber *, const uint8_t *, uint32_t);
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121
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122 /* Operators and elementary functions */
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123 decNumber * decNumberAbs(decNumber *, const decNumber *, decContext *);
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124 decNumber * decNumberAdd(decNumber *, const decNumber *, const decNumber *, decContext *);
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125 decNumber * decNumberAnd(decNumber *, const decNumber *, const decNumber *, decContext *);
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126 decNumber * decNumberCompare(decNumber *, const decNumber *, const decNumber *, decContext *);
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127 decNumber * decNumberCompareSignal(decNumber *, const decNumber *, const decNumber *, decContext *);
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128 decNumber * decNumberCompareTotal(decNumber *, const decNumber *, const decNumber *, decContext *);
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129 decNumber * decNumberCompareTotalMag(decNumber *, const decNumber *, const decNumber *, decContext *);
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130 decNumber * decNumberDivide(decNumber *, const decNumber *, const decNumber *, decContext *);
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131 decNumber * decNumberDivideInteger(decNumber *, const decNumber *, const decNumber *, decContext *);
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132 decNumber * decNumberExp(decNumber *, const decNumber *, decContext *);
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133 decNumber * decNumberFMA(decNumber *, const decNumber *, const decNumber *, const decNumber *, decContext *);
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134 decNumber * decNumberInvert(decNumber *, const decNumber *, decContext *);
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135 decNumber * decNumberLn(decNumber *, const decNumber *, decContext *);
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136 decNumber * decNumberLogB(decNumber *, const decNumber *, decContext *);
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137 decNumber * decNumberLog10(decNumber *, const decNumber *, decContext *);
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138 decNumber * decNumberMax(decNumber *, const decNumber *, const decNumber *, decContext *);
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139 decNumber * decNumberMaxMag(decNumber *, const decNumber *, const decNumber *, decContext *);
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140 decNumber * decNumberMin(decNumber *, const decNumber *, const decNumber *, decContext *);
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141 decNumber * decNumberMinMag(decNumber *, const decNumber *, const decNumber *, decContext *);
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142 decNumber * decNumberMinus(decNumber *, const decNumber *, decContext *);
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143 decNumber * decNumberMultiply(decNumber *, const decNumber *, const decNumber *, decContext *);
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144 decNumber * decNumberNormalize(decNumber *, const decNumber *, decContext *);
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145 decNumber * decNumberOr(decNumber *, const decNumber *, const decNumber *, decContext *);
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146 decNumber * decNumberPlus(decNumber *, const decNumber *, decContext *);
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147 decNumber * decNumberPower(decNumber *, const decNumber *, const decNumber *, decContext *);
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148 decNumber * decNumberQuantize(decNumber *, const decNumber *, const decNumber *, decContext *);
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149 decNumber * decNumberReduce(decNumber *, const decNumber *, decContext *);
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150 decNumber * decNumberRemainder(decNumber *, const decNumber *, const decNumber *, decContext *);
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151 decNumber * decNumberRemainderNear(decNumber *, const decNumber *, const decNumber *, decContext *);
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152 decNumber * decNumberRescale(decNumber *, const decNumber *, const decNumber *, decContext *);
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153 decNumber * decNumberRotate(decNumber *, const decNumber *, const decNumber *, decContext *);
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154 decNumber * decNumberSameQuantum(decNumber *, const decNumber *, const decNumber *);
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155 decNumber * decNumberScaleB(decNumber *, const decNumber *, const decNumber *, decContext *);
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156 decNumber * decNumberShift(decNumber *, const decNumber *, const decNumber *, decContext *);
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157 decNumber * decNumberSquareRoot(decNumber *, const decNumber *, decContext *);
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158 decNumber * decNumberSubtract(decNumber *, const decNumber *, const decNumber *, decContext *);
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159 decNumber * decNumberToIntegralExact(decNumber *, const decNumber *, decContext *);
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160 decNumber * decNumberToIntegralValue(decNumber *, const decNumber *, decContext *);
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161 decNumber * decNumberXor(decNumber *, const decNumber *, const decNumber *, decContext *);
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162
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163 /* Utilities */
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164 enum decClass decNumberClass(const decNumber *, decContext *);
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165 const char * decNumberClassToString(enum decClass);
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166 decNumber * decNumberCopy(decNumber *, const decNumber *);
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167 decNumber * decNumberCopyAbs(decNumber *, const decNumber *);
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168 decNumber * decNumberCopyNegate(decNumber *, const decNumber *);
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169 decNumber * decNumberCopySign(decNumber *, const decNumber *, const decNumber *);
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170 decNumber * decNumberNextMinus(decNumber *, const decNumber *, decContext *);
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171 decNumber * decNumberNextPlus(decNumber *, const decNumber *, decContext *);
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172 decNumber * decNumberNextToward(decNumber *, const decNumber *, const decNumber *, decContext *);
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173 decNumber * decNumberTrim(decNumber *);
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174 const char * decNumberVersion(void);
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175 decNumber * decNumberZero(decNumber *);
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176
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177 /* Functions for testing decNumbers (normality depends on context) */
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178 int32_t decNumberIsNormal(const decNumber *, decContext *);
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179 int32_t decNumberIsSubnormal(const decNumber *, decContext *);
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180
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181 /* Macros for testing decNumber *dn */
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182 #define decNumberIsCanonical(dn) (1) /* All decNumbers are saintly */
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183 #define decNumberIsFinite(dn) (((dn)->bits&DECSPECIAL)==0)
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184 #define decNumberIsInfinite(dn) (((dn)->bits&DECINF)!=0)
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185 #define decNumberIsNaN(dn) (((dn)->bits&(DECNAN|DECSNAN))!=0)
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186 #define decNumberIsNegative(dn) (((dn)->bits&DECNEG)!=0)
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187 #define decNumberIsQNaN(dn) (((dn)->bits&(DECNAN))!=0)
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188 #define decNumberIsSNaN(dn) (((dn)->bits&(DECSNAN))!=0)
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189 #define decNumberIsSpecial(dn) (((dn)->bits&DECSPECIAL)!=0)
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190 #define decNumberIsZero(dn) (*(dn)->lsu==0 \
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191 && (dn)->digits==1 \
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192 && (((dn)->bits&DECSPECIAL)==0))
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193 #define decNumberRadix(dn) (10)
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194
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195 #endif
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