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1 /* Copyright (C) 2007, 2009 Free Software Foundation, Inc.
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2
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3 This file is part of GCC.
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4
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5 GCC is free software; you can redistribute it and/or modify it under
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6 the terms of the GNU General Public License as published by the Free
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7 Software Foundation; either version 3, or (at your option) any later
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8 version.
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9
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10 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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11 WARRANTY; without even the implied warranty of MERCHANTABILITY or
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12 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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13 for more details.
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14
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15 Under Section 7 of GPL version 3, you are granted additional
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16 permissions described in the GCC Runtime Library Exception, version
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17 3.1, as published by the Free Software Foundation.
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18
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19 You should have received a copy of the GNU General Public License and
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20 a copy of the GCC Runtime Library Exception along with this program;
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21 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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22 <http://www.gnu.org/licenses/>. */
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23
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24 /*****************************************************************************
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25 * Non-computational Operations on Flags:
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26 ****************************************************************************/
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27
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28 #include "bid_internal.h"
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29
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30 // Note the following definitions from bid_conf.h: if the status flags are
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31 // global, they have a fixed name recognized by the library functions:
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32 // _IDEC_glbflags; pfpsf, defined as &_IDEC_glbflags, can be used instead; no
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33 // argument is passed for the status flags to the library functions; if the
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34 // status flags are local then they are passed as an arument, always by
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35 // reference, to the library functions
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36 //
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37 // #if !DECIMAL_GLOBAL_EXCEPTION_FLAGS
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38 // #define _EXC_FLAGS_PARAM , _IDEC_flags *pfpsf
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39 // #else
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40 // extern _IDEC_flags _IDEC_glbflags;
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41 // #define _EXC_FLAGS_PARAM
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42 // #define pfpsf &_IDEC_glbflags
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43 // #endif
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44
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45 #if DECIMAL_CALL_BY_REFERENCE
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46 void
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47 signalException (_IDEC_flags * pflagsmask _EXC_FLAGS_PARAM) {
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48 // *pflagsmask is the logical OR of the flags to be set, e.g.
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49 // *pflagsmask =INVALID_EXCEPTION | ZERO_DIVIDE_EXCEPTION | OVERFLOW_EXCEPTION
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50 // UNDERFLOW_EXCEPTION | INEXACT_EXCEPTION to set all five IEEE 754R
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51 // exception flags
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52 *pfpsf = *pfpsf | (*pflagsmask & BID_IEEE_FLAGS);
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53 }
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54 #else
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55 void
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56 signalException (_IDEC_flags flagsmask _EXC_FLAGS_PARAM) {
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57 // flagsmask is the logical OR of the flags to be set, e.g.
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58 // flagsmask = INVALID_EXCEPTION | ZERO_DIVIDE_EXCEPTION | OVERFLOW_EXCEPTION
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59 // UNDERFLOW_EXCEPTION | INEXACT_EXCEPTION to set all five IEEE 754R
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60 // exception flags
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61 *pfpsf = *pfpsf | (flagsmask & BID_IEEE_FLAGS);
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62 }
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63 #endif
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64
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65 #if DECIMAL_CALL_BY_REFERENCE
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66 void
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67 lowerFlags (_IDEC_flags * pflagsmask _EXC_FLAGS_PARAM) {
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68 // *pflagsmask is the logical OR of the flags to be cleared, e.g.
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69 // *pflagsmask =INVALID_EXCEPTION | ZERO_DIVIDE_EXCEPTION | OVERFLOW_EXCEPTION
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70 // UNDERFLOW_EXCEPTION | INEXACT_EXCEPTION to clear all five IEEE 754R
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71 // exception flags
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72 *pfpsf = *pfpsf & ~(*pflagsmask & BID_IEEE_FLAGS);
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73 }
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74 #else
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75 void
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76 lowerFlags (_IDEC_flags flagsmask _EXC_FLAGS_PARAM) {
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77 // flagsmask is the logical OR of the flags to be cleared, e.g.
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78 // flagsmask = INVALID_EXCEPTION | ZERO_DIVIDE_EXCEPTION | OVERFLOW_EXCEPTION
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79 // UNDERFLOW_EXCEPTION | INEXACT_EXCEPTION to clear all five IEEE 754R
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80 // exception flags
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81 *pfpsf = *pfpsf & ~(flagsmask & BID_IEEE_FLAGS);
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82 }
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83 #endif
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84
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85 #if DECIMAL_CALL_BY_REFERENCE
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86 void
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87 testFlags (_IDEC_flags * praised,
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88 _IDEC_flags * pflagsmask _EXC_FLAGS_PARAM) {
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89 // *praised is a pointer to the result, i.e. the logical OR of the flags
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90 // selected by *pflagsmask that are set; e.g. if
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91 // *pflagsmask = INVALID_EXCEPTION | UNDERFLOW_EXCEPTION | INEXACT_EXCEPTION
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92 // and only the invalid and inexact flags are raised (set) then upon return
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93 // *praised = INVALID_EXCEPTION | INEXACT_EXCEPTION
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94 *praised = *pfpsf & (*pflagsmask & BID_IEEE_FLAGS);
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95 }
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96 #else
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97 _IDEC_flags
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98 testFlags (_IDEC_flags flagsmask _EXC_FLAGS_PARAM) {
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99 _IDEC_flags raised;
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100 // the raturn value raised is the logical OR of the flags
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101 // selected by flagsmask, that are set; e.g. if
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102 // flagsmask = INVALID_EXCEPTION | UNDERFLOW_EXCEPTION | INEXACT_EXCEPTION and
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103 // only the invalid and inexact flags are raised (set) then the return value
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104 // is raised = INVALID_EXCEPTION | INEXACT_EXCEPTION
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105 raised = *pfpsf & (flagsmask & BID_IEEE_FLAGS);
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106 return (raised);
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107 }
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108 #endif
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109
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110 #if DECIMAL_CALL_BY_REFERENCE
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111 void
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112 testSavedFlags (_IDEC_flags * praised, _IDEC_flags * psavedflags,
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113 _IDEC_flags * pflagsmask) {
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114 // *praised is a pointer to the result, i.e. the logical OR of the flags
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115 // selected by *pflagsmask that are set in *psavedflags; e.g. if
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116 // *pflagsmask = INVALID_EXCEPTION | UNDERFLOW_EXCEPTION | INEXACT_EXCEPTION
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117 // and only the invalid and inexact flags are raised (set) in *psavedflags
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118 // then upon return *praised = INVALID_EXCEPTION | INEXACT_EXCEPTION
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119 // Note that the flags could be saved in a global variable, but this function
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120 // would still expect that value as an argument passed by reference
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121 *praised = *psavedflags & (*pflagsmask & BID_IEEE_FLAGS);
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122 }
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123 #else
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124 _IDEC_flags
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125 testSavedFlags (_IDEC_flags savedflags, _IDEC_flags flagsmask) {
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126 _IDEC_flags raised;
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127 // the raturn value raised is the logical OR of the flags
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128 // selected by flagsmask, that are set in savedflags; e.g. if
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129 // flagsmask = INVALID_EXCEPTION | UNDERFLOW_EXCEPTION | INEXACT_EXCEPTION and
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130 // only the invalid and inexact flags are raised (set) in savedflags
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131 // then the return value is raised = INVALID_EXCEPTION | INEXACT_EXCEPTION
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132 // Note that the flags could be saved in a global variable, but this function
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133 // would still expect that value as an argument passed by value
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134 raised = savedflags & (flagsmask & BID_IEEE_FLAGS);
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135 return (raised);
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136 }
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137 #endif
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138
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139 #if DECIMAL_CALL_BY_REFERENCE
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140 void
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141 restoreFlags (_IDEC_flags * pflagsvalues,
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142 _IDEC_flags * pflagsmask _EXC_FLAGS_PARAM) {
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143 // restore the status flags selected by *pflagsmask to the values speciafied
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144 // (as a logical OR) in *pflagsvalues; e.g. if
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145 // *pflagsmask = INVALID_EXCEPTION | UNDERFLOW_EXCEPTION | INEXACT_EXCEPTION
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146 // and only the invalid and inexact flags are raised (set) in *pflagsvalues
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147 // then upon return the invalid status flag will be set, the underflow status
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148 // flag will be clear, and the inexact status flag will be set
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149 *pfpsf = *pfpsf & ~(*pflagsmask & BID_IEEE_FLAGS);
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150 // clear flags that have to be restored
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151 *pfpsf = *pfpsf | (*pflagsvalues & (*pflagsmask & BID_IEEE_FLAGS));
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152 // restore flags
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153 }
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154 #else
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155 void
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156 restoreFlags (_IDEC_flags flagsvalues,
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157 _IDEC_flags flagsmask _EXC_FLAGS_PARAM) {
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158 // restore the status flags selected by flagsmask to the values speciafied
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159 // (as a logical OR) in flagsvalues; e.g. if
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160 // flagsmask = INVALID_EXCEPTION | UNDERFLOW_EXCEPTION | INEXACT_EXCEPTION
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161 // and only the invalid and inexact flags are raised (set) in flagsvalues
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162 // then upon return the invalid status flag will be set, the underflow status
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163 // flag will be clear, and the inexact status flag will be set
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164 *pfpsf = *pfpsf & ~(flagsmask & BID_IEEE_FLAGS);
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165 // clear flags that have to be restored
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166 *pfpsf = *pfpsf | (flagsvalues & (flagsmask & BID_IEEE_FLAGS));
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167 // restore flags
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168 }
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169 #endif
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170
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171 #if DECIMAL_CALL_BY_REFERENCE
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172 void
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173 saveFlags (_IDEC_flags * pflagsvalues,
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174 _IDEC_flags * pflagsmask _EXC_FLAGS_PARAM) {
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175 // return in *pflagsvalues the status flags specified (as a logical OR) in
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176 // *pflagsmask; e.g. if
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177 // *pflagsmask = INVALID_EXCEPTION | UNDERFLOW_EXCEPTION | INEXACT_EXCEPTION
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178 // and only the invalid and inexact flags are raised (set) in the status word,
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179 // then upon return the value in *pflagsvalues will have the invalid status
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180 // flag set, the underflow status flag clear, and the inexact status flag set
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181 *pflagsvalues = *pfpsf & (*pflagsmask & BID_IEEE_FLAGS);
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182 }
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183 #else
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184 _IDEC_flags
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185 saveFlags (_IDEC_flags flagsmask _EXC_FLAGS_PARAM) {
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186 _IDEC_flags flagsvalues;
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187 // return the status flags specified (as a logical OR) in flagsmask; e.g. if
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188 // flagsmask = INVALID_EXCEPTION | UNDERFLOW_EXCEPTION | INEXACT_EXCEPTION
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189 // and only the invalid and inexact flags are raised (set) in the status word,
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190 // then the return value will have the invalid status flag set, the
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191 // underflow status flag clear, and the inexact status flag set
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192 flagsvalues = *pfpsf & (flagsmask & BID_IEEE_FLAGS);
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193 return (flagsvalues);
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194 }
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195 #endif
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196
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197 // Note the following definitions from bid_conf.h (rearranged): if the rounding
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198 // mode is global, it has a fixed name recognized by the library functions:
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199 // _IDEC_glbround; rnd_mode, defined as &_IDEC_glbround, can be used instead; no
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200 // argument is passed for the rounding mode to the library functions; if the
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201 // rounding mode is local then it is passed as an arument, by reference or by
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202 // value, to the library functions
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203 //
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204 // #if DECIMAL_CALL_BY_REFERENCE
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205 // #if !DECIMAL_GLOBAL_ROUNDING
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206 // #define _RND_MODE_PARAM , _IDEC_round *prnd_mode
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207 // #else
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208 // #define _RND_MODE_PARAM
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209 // #define rnd_mode _IDEC_glbround
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210 // #endif
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211 // #else
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212 // #if !DECIMAL_GLOBAL_ROUNDING
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213 // #define _RND_MODE_PARAM , _IDEC_round rnd_mode
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214 // #else
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215 // #define _RND_MODE_PARAM
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216 // #define rnd_mode _IDEC_glbround
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217 // #endif
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218 // #endif
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219
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220 #if DECIMAL_CALL_BY_REFERENCE
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221 #if !DECIMAL_GLOBAL_ROUNDING
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222 // #define _RND_MODE_PARAM , _IDEC_round *prnd_mode
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223 void
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224 getDecimalRoundingDirection (_IDEC_round * rounding_mode
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225 _RND_MODE_PARAM) {
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226 // returns the current rounding mode
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227 *rounding_mode = *prnd_mode;
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228 }
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229 #else
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230 // #define _RND_MODE_PARAM
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231 // #define rnd_mode _IDEC_glbround
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232 void
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233 getDecimalRoundingDirection (_IDEC_round * rounding_mode
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234 _RND_MODE_PARAM) {
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235 // returns the current rounding mode
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236 *rounding_mode = rnd_mode;
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237 }
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238 #endif
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239 #else
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240 #if !DECIMAL_GLOBAL_ROUNDING
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241 // #define _RND_MODE_PARAM , _IDEC_round rnd_mode
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242 _IDEC_round
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243 getDecimalRoundingDirection (_IDEC_round rnd_mode) {
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244 // returns the current rounding mode
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245 return (rnd_mode);
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246 }
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247 #else
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248 // #define _RND_MODE_PARAM
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249 // #define rnd_mode _IDEC_glbround
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250 _IDEC_round
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251 getDecimalRoundingDirection (void) {
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252 // returns the current rounding mode
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253 return (rnd_mode);
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254 }
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255 #endif
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256 #endif
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257
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258 #if DECIMAL_CALL_BY_REFERENCE
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259 #if !DECIMAL_GLOBAL_ROUNDING
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260 // #define _RND_MODE_PARAM , _IDEC_round *prnd_mode
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261 void
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262 setDecimalRoundingDirection (_IDEC_round * rounding_mode
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263 _RND_MODE_PARAM) {
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264 // sets the current rounding mode to the value in *rounding_mode, if valid
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265 if (*rounding_mode == ROUNDING_TO_NEAREST ||
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266 *rounding_mode == ROUNDING_DOWN ||
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267 *rounding_mode == ROUNDING_UP ||
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268 *rounding_mode == ROUNDING_TO_ZERO ||
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269 *rounding_mode == ROUNDING_TIES_AWAY) {
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270 *prnd_mode = *rounding_mode;
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271 }
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272 }
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273 #else
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274 // #define _RND_MODE_PARAM
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275 // #define rnd_mode _IDEC_glbround
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276 void
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277 setDecimalRoundingDirection (_IDEC_round * rounding_mode
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278 ) {
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279 // sets the global rounding mode to the value in *rounding_mode, if valid
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280 if (*rounding_mode == ROUNDING_TO_NEAREST ||
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281 *rounding_mode == ROUNDING_DOWN ||
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282 *rounding_mode == ROUNDING_UP ||
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283 *rounding_mode == ROUNDING_TO_ZERO ||
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284 *rounding_mode == ROUNDING_TIES_AWAY) {
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285 rnd_mode = *rounding_mode;
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286 }
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287 }
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288 #endif
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289 #else
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290 #if !DECIMAL_GLOBAL_ROUNDING
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291 // #define _RND_MODE_PARAM , _IDEC_round rnd_mode
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292 _IDEC_round
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293 setDecimalRoundingDirection (_IDEC_round rounding_mode _RND_MODE_PARAM) {
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294 // sets the current rounding mode to the value in rounding_mode;
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295 // however, when arguments are passed by value and the rounding mode
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296 // is a local variable, this is not of any use
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297 if (rounding_mode == ROUNDING_TO_NEAREST ||
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298 rounding_mode == ROUNDING_DOWN ||
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299 rounding_mode == ROUNDING_UP ||
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300 rounding_mode == ROUNDING_TO_ZERO ||
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301 rounding_mode == ROUNDING_TIES_AWAY) {
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302 return (rounding_mode);
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303 }
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304 return (rnd_mode);
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305 }
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306 #else
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307 // #define _RND_MODE_PARAM
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308 // #define rnd_mode _IDEC_glbround
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309 void
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310 setDecimalRoundingDirection (_IDEC_round rounding_mode) {
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311 // sets the current rounding mode to the value in rounding_mode, if valid;
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312 if (rounding_mode == ROUNDING_TO_NEAREST ||
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313 rounding_mode == ROUNDING_DOWN ||
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314 rounding_mode == ROUNDING_UP ||
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315 rounding_mode == ROUNDING_TO_ZERO ||
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316 rounding_mode == ROUNDING_TIES_AWAY) {
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317 rnd_mode = rounding_mode;
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318 }
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319 }
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320 #endif
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321 #endif
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322
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323 #if DECIMAL_CALL_BY_REFERENCE
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324 void
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325 is754 (int *retval) {
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326 *retval = 0;
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327 }
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328 #else
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329 int
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330 is754 (void) {
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331 return 0;
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332 }
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333 #endif
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334
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335 #if DECIMAL_CALL_BY_REFERENCE
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336 void
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337 is754R (int *retval) {
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338 *retval = 1;
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339 }
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340 #else
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341 int
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342 is754R (void) {
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343 return 1;
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344 }
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345 #endif
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