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1 /* Decimal context module 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 Context module */
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28 /* ------------------------------------------------------------------ */
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29 /* This module comprises the routines for handling arithmetic */
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30 /* context structures. */
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31 /* ------------------------------------------------------------------ */
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32
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33 #include <string.h> /* for strcmp */
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34 #include <stdio.h> /* for printf if DECCHECK */
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35 #include "dconfig.h" /* for GCC definitions */
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36 #include "decContext.h" /* context and base types */
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37 #include "decNumberLocal.h" /* decNumber local types, etc. */
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38
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39 #if DECCHECK
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40 /* compile-time endian tester [assumes sizeof(Int)>1] */
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41 static const Int mfcone=1; /* constant 1 */
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42 static const Flag *mfctop=(Flag *)&mfcone; /* -> top byte */
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43 #define LITEND *mfctop /* named flag; 1=little-endian */
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44 #endif
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45
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46 /* ------------------------------------------------------------------ */
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47 /* round-for-reround digits */
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48 /* ------------------------------------------------------------------ */
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49 const uByte DECSTICKYTAB[10]={1,1,2,3,4,6,6,7,8,9}; /* used if sticky */
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50
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51 /* ------------------------------------------------------------------ */
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52 /* Powers of ten (powers[n]==10**n, 0<=n<=9) */
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53 /* ------------------------------------------------------------------ */
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54 const uInt DECPOWERS[10]={1, 10, 100, 1000, 10000, 100000, 1000000,
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55 10000000, 100000000, 1000000000};
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56
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57 /* ------------------------------------------------------------------ */
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58 /* decContextClearStatus -- clear bits in current status */
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59 /* */
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60 /* context is the context structure to be queried */
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61 /* mask indicates the bits to be cleared (the status bit that */
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62 /* corresponds to each 1 bit in the mask is cleared) */
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63 /* returns context */
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64 /* */
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65 /* No error is possible. */
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66 /* ------------------------------------------------------------------ */
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67 decContext *decContextClearStatus(decContext *context, uInt mask) {
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68 context->status&=~mask;
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69 return context;
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70 } /* decContextClearStatus */
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71
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72 /* ------------------------------------------------------------------ */
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73 /* decContextDefault -- initialize a context structure */
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74 /* */
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75 /* context is the structure to be initialized */
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76 /* kind selects the required set of default values, one of: */
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77 /* DEC_INIT_BASE -- select ANSI X3-274 defaults */
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78 /* DEC_INIT_DECIMAL32 -- select IEEE 754r defaults, 32-bit */
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79 /* DEC_INIT_DECIMAL64 -- select IEEE 754r defaults, 64-bit */
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80 /* DEC_INIT_DECIMAL128 -- select IEEE 754r defaults, 128-bit */
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81 /* For any other value a valid context is returned, but with */
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82 /* Invalid_operation set in the status field. */
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83 /* returns a context structure with the appropriate initial values. */
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84 /* ------------------------------------------------------------------ */
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85 decContext * decContextDefault(decContext *context, Int kind) {
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86 /* set defaults... */
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87 context->digits=9; /* 9 digits */
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88 context->emax=DEC_MAX_EMAX; /* 9-digit exponents */
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89 context->emin=DEC_MIN_EMIN; /* .. balanced */
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90 context->round=DEC_ROUND_HALF_UP; /* 0.5 rises */
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91 context->traps=DEC_Errors; /* all but informational */
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92 context->status=0; /* cleared */
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93 context->clamp=0; /* no clamping */
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94 #if DECSUBSET
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95 context->extended=0; /* cleared */
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96 #endif
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97 switch (kind) {
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98 case DEC_INIT_BASE:
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99 /* [use defaults] */
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100 break;
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101 case DEC_INIT_DECIMAL32:
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102 context->digits=7; /* digits */
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103 context->emax=96; /* Emax */
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104 context->emin=-95; /* Emin */
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105 context->round=DEC_ROUND_HALF_EVEN; /* 0.5 to nearest even */
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106 context->traps=0; /* no traps set */
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107 context->clamp=1; /* clamp exponents */
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108 #if DECSUBSET
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109 context->extended=1; /* set */
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110 #endif
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111 break;
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112 case DEC_INIT_DECIMAL64:
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113 context->digits=16; /* digits */
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114 context->emax=384; /* Emax */
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115 context->emin=-383; /* Emin */
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116 context->round=DEC_ROUND_HALF_EVEN; /* 0.5 to nearest even */
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117 context->traps=0; /* no traps set */
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118 context->clamp=1; /* clamp exponents */
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119 #if DECSUBSET
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120 context->extended=1; /* set */
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121 #endif
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122 break;
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123 case DEC_INIT_DECIMAL128:
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124 context->digits=34; /* digits */
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125 context->emax=6144; /* Emax */
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126 context->emin=-6143; /* Emin */
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127 context->round=DEC_ROUND_HALF_EVEN; /* 0.5 to nearest even */
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128 context->traps=0; /* no traps set */
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129 context->clamp=1; /* clamp exponents */
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130 #if DECSUBSET
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131 context->extended=1; /* set */
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132 #endif
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133 break;
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134
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135 default: /* invalid Kind */
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136 /* use defaults, and .. */
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137 decContextSetStatus(context, DEC_Invalid_operation); /* trap */
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138 }
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139
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140 #if DECCHECK
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141 if (LITEND!=DECLITEND) {
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142 const char *adj;
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143 if (LITEND) adj="little";
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144 else adj="big";
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145 printf("Warning: DECLITEND is set to %d, but this computer appears to be %s-endian\n",
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146 DECLITEND, adj);
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147 }
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148 #endif
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149 return context;} /* decContextDefault */
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150
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151 /* ------------------------------------------------------------------ */
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152 /* decContextGetRounding -- return current rounding mode */
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153 /* */
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154 /* context is the context structure to be queried */
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155 /* returns the rounding mode */
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156 /* */
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157 /* No error is possible. */
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158 /* ------------------------------------------------------------------ */
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159 enum rounding decContextGetRounding(decContext *context) {
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160 return context->round;
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161 } /* decContextGetRounding */
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162
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163 /* ------------------------------------------------------------------ */
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164 /* decContextGetStatus -- return current status */
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165 /* */
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166 /* context is the context structure to be queried */
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167 /* returns status */
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168 /* */
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169 /* No error is possible. */
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170 /* ------------------------------------------------------------------ */
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171 uInt decContextGetStatus(decContext *context) {
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172 return context->status;
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173 } /* decContextGetStatus */
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174
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175 /* ------------------------------------------------------------------ */
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176 /* decContextRestoreStatus -- restore bits in current status */
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177 /* */
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178 /* context is the context structure to be updated */
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179 /* newstatus is the source for the bits to be restored */
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180 /* mask indicates the bits to be restored (the status bit that */
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181 /* corresponds to each 1 bit in the mask is set to the value of */
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182 /* the correspnding bit in newstatus) */
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183 /* returns context */
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184 /* */
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185 /* No error is possible. */
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186 /* ------------------------------------------------------------------ */
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187 decContext *decContextRestoreStatus(decContext *context,
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188 uInt newstatus, uInt mask) {
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189 context->status&=~mask; /* clear the selected bits */
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190 context->status|=(mask&newstatus); /* or in the new bits */
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191 return context;
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192 } /* decContextRestoreStatus */
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193
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194 /* ------------------------------------------------------------------ */
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195 /* decContextSaveStatus -- save bits in current status */
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196 /* */
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197 /* context is the context structure to be queried */
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198 /* mask indicates the bits to be saved (the status bits that */
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199 /* correspond to each 1 bit in the mask are saved) */
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200 /* returns the AND of the mask and the current status */
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201 /* */
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202 /* No error is possible. */
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203 /* ------------------------------------------------------------------ */
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204 uInt decContextSaveStatus(decContext *context, uInt mask) {
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205 return context->status&mask;
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206 } /* decContextSaveStatus */
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207
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208 /* ------------------------------------------------------------------ */
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209 /* decContextSetRounding -- set current rounding mode */
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210 /* */
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211 /* context is the context structure to be updated */
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212 /* newround is the value which will replace the current mode */
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213 /* returns context */
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214 /* */
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215 /* No error is possible. */
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216 /* ------------------------------------------------------------------ */
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217 decContext *decContextSetRounding(decContext *context,
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218 enum rounding newround) {
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219 context->round=newround;
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220 return context;
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221 } /* decContextSetRounding */
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222
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223 /* ------------------------------------------------------------------ */
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224 /* decContextSetStatus -- set status and raise trap if appropriate */
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225 /* */
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226 /* context is the context structure to be updated */
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227 /* status is the DEC_ exception code */
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228 /* returns the context structure */
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229 /* */
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230 /* Control may never return from this routine, if there is a signal */
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231 /* handler and it takes a long jump. */
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232 /* ------------------------------------------------------------------ */
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233 decContext * decContextSetStatus(decContext *context, uInt status) {
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234 context->status|=status;
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235 if (status & context->traps) raise(SIGFPE);
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236 return context;} /* decContextSetStatus */
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237
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238 /* ------------------------------------------------------------------ */
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239 /* decContextSetStatusFromString -- set status from a string + trap */
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240 /* */
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241 /* context is the context structure to be updated */
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242 /* string is a string exactly equal to one that might be returned */
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243 /* by decContextStatusToString */
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244 /* */
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245 /* The status bit corresponding to the string is set, and a trap */
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246 /* is raised if appropriate. */
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247 /* */
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248 /* returns the context structure, unless the string is equal to */
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249 /* DEC_Condition_MU or is not recognized. In these cases NULL is */
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250 /* returned. */
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251 /* ------------------------------------------------------------------ */
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252 decContext * decContextSetStatusFromString(decContext *context,
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253 const char *string) {
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254 if (strcmp(string, DEC_Condition_CS)==0)
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255 return decContextSetStatus(context, DEC_Conversion_syntax);
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256 if (strcmp(string, DEC_Condition_DZ)==0)
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257 return decContextSetStatus(context, DEC_Division_by_zero);
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258 if (strcmp(string, DEC_Condition_DI)==0)
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259 return decContextSetStatus(context, DEC_Division_impossible);
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260 if (strcmp(string, DEC_Condition_DU)==0)
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261 return decContextSetStatus(context, DEC_Division_undefined);
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262 if (strcmp(string, DEC_Condition_IE)==0)
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263 return decContextSetStatus(context, DEC_Inexact);
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264 if (strcmp(string, DEC_Condition_IS)==0)
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265 return decContextSetStatus(context, DEC_Insufficient_storage);
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266 if (strcmp(string, DEC_Condition_IC)==0)
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267 return decContextSetStatus(context, DEC_Invalid_context);
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268 if (strcmp(string, DEC_Condition_IO)==0)
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269 return decContextSetStatus(context, DEC_Invalid_operation);
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270 #if DECSUBSET
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271 if (strcmp(string, DEC_Condition_LD)==0)
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272 return decContextSetStatus(context, DEC_Lost_digits);
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273 #endif
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274 if (strcmp(string, DEC_Condition_OV)==0)
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275 return decContextSetStatus(context, DEC_Overflow);
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276 if (strcmp(string, DEC_Condition_PA)==0)
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277 return decContextSetStatus(context, DEC_Clamped);
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278 if (strcmp(string, DEC_Condition_RO)==0)
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279 return decContextSetStatus(context, DEC_Rounded);
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280 if (strcmp(string, DEC_Condition_SU)==0)
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281 return decContextSetStatus(context, DEC_Subnormal);
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282 if (strcmp(string, DEC_Condition_UN)==0)
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283 return decContextSetStatus(context, DEC_Underflow);
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284 if (strcmp(string, DEC_Condition_ZE)==0)
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285 return context;
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286 return NULL; /* Multiple status, or unknown */
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287 } /* decContextSetStatusFromString */
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288
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289 /* ------------------------------------------------------------------ */
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290 /* decContextSetStatusFromStringQuiet -- set status from a string */
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291 /* */
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292 /* context is the context structure to be updated */
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293 /* string is a string exactly equal to one that might be returned */
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294 /* by decContextStatusToString */
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295 /* */
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296 /* The status bit corresponding to the string is set; no trap is */
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297 /* raised. */
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298 /* */
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299 /* returns the context structure, unless the string is equal to */
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300 /* DEC_Condition_MU or is not recognized. In these cases NULL is */
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301 /* returned. */
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302 /* ------------------------------------------------------------------ */
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303 decContext * decContextSetStatusFromStringQuiet(decContext *context,
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304 const char *string) {
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305 if (strcmp(string, DEC_Condition_CS)==0)
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306 return decContextSetStatusQuiet(context, DEC_Conversion_syntax);
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307 if (strcmp(string, DEC_Condition_DZ)==0)
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308 return decContextSetStatusQuiet(context, DEC_Division_by_zero);
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309 if (strcmp(string, DEC_Condition_DI)==0)
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310 return decContextSetStatusQuiet(context, DEC_Division_impossible);
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311 if (strcmp(string, DEC_Condition_DU)==0)
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312 return decContextSetStatusQuiet(context, DEC_Division_undefined);
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313 if (strcmp(string, DEC_Condition_IE)==0)
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314 return decContextSetStatusQuiet(context, DEC_Inexact);
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315 if (strcmp(string, DEC_Condition_IS)==0)
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316 return decContextSetStatusQuiet(context, DEC_Insufficient_storage);
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317 if (strcmp(string, DEC_Condition_IC)==0)
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318 return decContextSetStatusQuiet(context, DEC_Invalid_context);
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319 if (strcmp(string, DEC_Condition_IO)==0)
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320 return decContextSetStatusQuiet(context, DEC_Invalid_operation);
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321 #if DECSUBSET
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322 if (strcmp(string, DEC_Condition_LD)==0)
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323 return decContextSetStatusQuiet(context, DEC_Lost_digits);
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324 #endif
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325 if (strcmp(string, DEC_Condition_OV)==0)
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326 return decContextSetStatusQuiet(context, DEC_Overflow);
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327 if (strcmp(string, DEC_Condition_PA)==0)
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328 return decContextSetStatusQuiet(context, DEC_Clamped);
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329 if (strcmp(string, DEC_Condition_RO)==0)
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330 return decContextSetStatusQuiet(context, DEC_Rounded);
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331 if (strcmp(string, DEC_Condition_SU)==0)
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332 return decContextSetStatusQuiet(context, DEC_Subnormal);
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333 if (strcmp(string, DEC_Condition_UN)==0)
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334 return decContextSetStatusQuiet(context, DEC_Underflow);
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335 if (strcmp(string, DEC_Condition_ZE)==0)
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336 return context;
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337 return NULL; /* Multiple status, or unknown */
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338 } /* decContextSetStatusFromStringQuiet */
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339
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340 /* ------------------------------------------------------------------ */
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341 /* decContextSetStatusQuiet -- set status without trap */
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342 /* */
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343 /* context is the context structure to be updated */
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344 /* status is the DEC_ exception code */
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345 /* returns the context structure */
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346 /* */
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347 /* No error is possible. */
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348 /* ------------------------------------------------------------------ */
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349 decContext * decContextSetStatusQuiet(decContext *context, uInt status) {
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350 context->status|=status;
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351 return context;} /* decContextSetStatusQuiet */
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352
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353 /* ------------------------------------------------------------------ */
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354 /* decContextStatusToString -- convert status flags to a string */
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355 /* */
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356 /* context is a context with valid status field */
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357 /* */
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358 /* returns a constant string describing the condition. If multiple */
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359 /* (or no) flags are set, a generic constant message is returned. */
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360 /* ------------------------------------------------------------------ */
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361 const char *decContextStatusToString(const decContext *context) {
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362 Int status=context->status;
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363
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364 /* test the five IEEE first, as some of the others are ambiguous when */
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365 /* DECEXTFLAG=0 */
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366 if (status==DEC_Invalid_operation ) return DEC_Condition_IO;
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367 if (status==DEC_Division_by_zero ) return DEC_Condition_DZ;
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368 if (status==DEC_Overflow ) return DEC_Condition_OV;
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369 if (status==DEC_Underflow ) return DEC_Condition_UN;
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370 if (status==DEC_Inexact ) return DEC_Condition_IE;
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371
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372 if (status==DEC_Division_impossible ) return DEC_Condition_DI;
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373 if (status==DEC_Division_undefined ) return DEC_Condition_DU;
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374 if (status==DEC_Rounded ) return DEC_Condition_RO;
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375 if (status==DEC_Clamped ) return DEC_Condition_PA;
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376 if (status==DEC_Subnormal ) return DEC_Condition_SU;
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377 if (status==DEC_Conversion_syntax ) return DEC_Condition_CS;
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378 if (status==DEC_Insufficient_storage ) return DEC_Condition_IS;
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379 if (status==DEC_Invalid_context ) return DEC_Condition_IC;
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380 #if DECSUBSET
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381 if (status==DEC_Lost_digits ) return DEC_Condition_LD;
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382 #endif
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383 if (status==0 ) return DEC_Condition_ZE;
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384 return DEC_Condition_MU; /* Multiple errors */
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385 } /* decContextStatusToString */
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386
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387 /* ------------------------------------------------------------------ */
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388 /* decContextTestSavedStatus -- test bits in saved status */
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389 /* */
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390 /* oldstatus is the status word to be tested */
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391 /* mask indicates the bits to be tested (the oldstatus bits that */
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392 /* correspond to each 1 bit in the mask are tested) */
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393 /* returns 1 if any of the tested bits are 1, or 0 otherwise */
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394 /* */
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395 /* No error is possible. */
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396 /* ------------------------------------------------------------------ */
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397 uInt decContextTestSavedStatus(uInt oldstatus, uInt mask) {
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398 return (oldstatus&mask)!=0;
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399 } /* decContextTestSavedStatus */
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400
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401 /* ------------------------------------------------------------------ */
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402 /* decContextTestStatus -- test bits in current status */
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403 /* */
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404 /* context is the context structure to be updated */
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405 /* mask indicates the bits to be tested (the status bits that */
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406 /* correspond to each 1 bit in the mask are tested) */
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407 /* returns 1 if any of the tested bits are 1, or 0 otherwise */
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408 /* */
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409 /* No error is possible. */
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410 /* ------------------------------------------------------------------ */
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411 uInt decContextTestStatus(decContext *context, uInt mask) {
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412 return (context->status&mask)!=0;
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413 } /* decContextTestStatus */
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414
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415 /* ------------------------------------------------------------------ */
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416 /* decContextZeroStatus -- clear all status bits */
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417 /* */
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418 /* context is the context structure to be updated */
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419 /* returns context */
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420 /* */
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421 /* No error is possible. */
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422 /* ------------------------------------------------------------------ */
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423 decContext *decContextZeroStatus(decContext *context) {
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424 context->status=0;
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425 return context;
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426 } /* decContextZeroStatus */
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427
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