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111
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1 /* SysV FPU-related code (for systems not otherwise supported).
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2 Copyright (C) 2005-2017 Free Software Foundation, Inc.
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3 Contributed by Francois-Xavier Coudert <coudert@clipper.ens.fr>
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4
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5 This file is part of the GNU Fortran runtime library (libgfortran).
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6
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7 Libgfortran is free software; you can redistribute it and/or
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8 modify it under the terms of the GNU General Public
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9 License as published by the Free Software Foundation; either
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10 version 3 of the License, or (at your option) any later version.
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11
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12 Libgfortran is distributed in the hope that it will be useful,
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13 but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 GNU General Public License 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 /* FPU-related code for SysV platforms with fpsetmask(). */
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27
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28 /* BSD and Solaris systems have slightly different types and functions
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29 naming. We deal with these here, to simplify the code below. */
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30
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31 #if HAVE_FP_EXCEPT
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32 # define FP_EXCEPT_TYPE fp_except
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33 #elif HAVE_FP_EXCEPT_T
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34 # define FP_EXCEPT_TYPE fp_except_t
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35 #else
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36 choke me
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37 #endif
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38
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39 #if HAVE_FP_RND
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40 # define FP_RND_TYPE fp_rnd
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41 #elif HAVE_FP_RND_T
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42 # define FP_RND_TYPE fp_rnd_t
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43 #else
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44 choke me
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45 #endif
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46
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47 #if HAVE_FPSETSTICKY
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48 # define FPSETSTICKY fpsetsticky
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49 #elif HAVE_FPRESETSTICKY
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50 # define FPSETSTICKY fpresetsticky
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51 #else
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52 choke me
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53 #endif
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54
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55
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56 void
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57 set_fpu_trap_exceptions (int trap, int notrap)
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58 {
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59 FP_EXCEPT_TYPE cw = fpgetmask();
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60
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61 #ifdef FP_X_INV
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62 if (trap & GFC_FPE_INVALID)
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63 cw |= FP_X_INV;
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64 if (notrap & GFC_FPE_INVALID)
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65 cw &= ~FP_X_INV;
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66 #endif
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67
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68 #ifdef FP_X_DNML
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69 if (trap & GFC_FPE_DENORMAL)
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70 cw |= FP_X_DNML;
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71 if (notrap & GFC_FPE_DENORMAL)
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72 cw &= ~FP_X_DNML;
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73 #endif
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74
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75 #ifdef FP_X_DZ
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76 if (trap & GFC_FPE_ZERO)
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77 cw |= FP_X_DZ;
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78 if (notrap & GFC_FPE_ZERO)
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79 cw &= ~FP_X_DZ;
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80 #endif
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81
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82 #ifdef FP_X_OFL
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83 if (trap & GFC_FPE_OVERFLOW)
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84 cw |= FP_X_OFL;
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85 if (notrap & GFC_FPE_OVERFLOW)
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86 cw &= ~FP_X_OFL;
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87 #endif
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88
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89 #ifdef FP_X_UFL
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90 if (trap & GFC_FPE_UNDERFLOW)
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91 cw |= FP_X_UFL;
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92 if (notrap & GFC_FPE_UNDERFLOW)
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93 cw &= ~FP_X_UFL;
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94 #endif
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95
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96 #ifdef FP_X_IMP
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97 if (trap & GFC_FPE_INEXACT)
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98 cw |= FP_X_IMP;
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99 if (notrap & GFC_FPE_INEXACT)
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100 cw &= ~FP_X_IMP;
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101 #endif
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102
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103 fpsetmask(cw);
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104 }
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105
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106
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107 int
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108 get_fpu_trap_exceptions (void)
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109 {
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110 int res = 0;
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111 FP_EXCEPT_TYPE cw = fpgetmask();
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112
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113 #ifdef FP_X_INV
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114 if (cw & FP_X_INV) res |= GFC_FPE_INVALID;
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115 #endif
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116
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117 #ifdef FP_X_DNML
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118 if (cw & FP_X_DNML) res |= GFC_FPE_DENORMAL;
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119 #endif
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120
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121 #ifdef FP_X_DZ
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122 if (cw & FP_X_DZ) res |= GFC_FPE_ZERO;
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123 #endif
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124
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125 #ifdef FP_X_OFL
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126 if (cw & FP_X_OFL) res |= GFC_FPE_OVERFLOW;
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127 #endif
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128
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129 #ifdef FP_X_UFL
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130 if (cw & FP_X_UFL) res |= GFC_FPE_UNDERFLOW;
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131 #endif
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132
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133 #ifdef FP_X_IMP
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134 if (cw & FP_X_IMP) res |= GFC_FPE_INEXACT;
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135 #endif
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136
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137 return res;
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138 }
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139
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140
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141 int
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142 support_fpu_trap (int flag)
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143 {
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144 return support_fpu_flag (flag);
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145 }
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146
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147
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148 void
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149 set_fpu (void)
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150 {
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151 #ifndef FP_X_INV
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152 if (options.fpe & GFC_FPE_INVALID)
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153 estr_write ("Fortran runtime warning: IEEE 'invalid operation' "
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154 "exception not supported.\n");
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155 #endif
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156
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157 #ifndef FP_X_DNML
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158 if (options.fpe & GFC_FPE_DENORMAL)
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159 estr_write ("Fortran runtime warning: Floating point 'denormal operand' "
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160 "exception not supported.\n");
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161 #endif
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162
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163 #ifndef FP_X_DZ
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164 if (options.fpe & GFC_FPE_ZERO)
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165 estr_write ("Fortran runtime warning: IEEE 'division by zero' "
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166 "exception not supported.\n");
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167 #endif
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168
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169 #ifndef FP_X_OFL
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170 if (options.fpe & GFC_FPE_OVERFLOW)
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171 estr_write ("Fortran runtime warning: IEEE 'overflow' "
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172 "exception not supported.\n");
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173 #endif
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174
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175 #ifndef FP_X_UFL
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176 if (options.fpe & GFC_FPE_UNDERFLOW)
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177 estr_write ("Fortran runtime warning: IEEE 'underflow' "
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178 "exception not supported.\n");
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179 #endif
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180
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181 #ifndef FP_X_IMP
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182 if (options.fpe & GFC_FPE_INEXACT)
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183 estr_write ("Fortran runtime warning: IEEE 'inexact' "
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184 "exception not supported.\n");
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185 #endif
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186
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187 set_fpu_trap_exceptions (options.fpe, 0);
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188 }
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189
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190
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191 int
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192 get_fpu_except_flags (void)
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193 {
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194 int result;
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195 FP_EXCEPT_TYPE set_excepts;
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196
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197 result = 0;
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198 set_excepts = fpgetsticky ();
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199
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200 #ifdef FP_X_INV
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201 if (set_excepts & FP_X_INV)
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202 result |= GFC_FPE_INVALID;
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203 #endif
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204
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205 #ifdef FP_X_DZ
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206 if (set_excepts & FP_X_DZ)
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207 result |= GFC_FPE_ZERO;
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208 #endif
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209
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210 #ifdef FP_X_OFL
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211 if (set_excepts & FP_X_OFL)
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212 result |= GFC_FPE_OVERFLOW;
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213 #endif
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214
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215 #ifdef FP_X_UFL
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216 if (set_excepts & FP_X_UFL)
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217 result |= GFC_FPE_UNDERFLOW;
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218 #endif
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219
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220 #ifdef FP_X_DNML
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221 if (set_excepts & FP_X_DNML)
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222 result |= GFC_FPE_DENORMAL;
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223 #endif
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224
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225 #ifdef FP_X_IMP
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226 if (set_excepts & FP_X_IMP)
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227 result |= GFC_FPE_INEXACT;
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228 #endif
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229
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230 return result;
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231 }
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232
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233
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234 void
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235 set_fpu_except_flags (int set, int clear)
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236 {
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237 FP_EXCEPT_TYPE flags;
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238
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239 flags = fpgetsticky ();
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240
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241 #ifdef FP_X_INV
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242 if (set & GFC_FPE_INVALID)
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243 flags |= FP_X_INV;
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244 if (clear & GFC_FPE_INVALID)
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245 flags &= ~FP_X_INV;
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246 #endif
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247
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248 #ifdef FP_X_DZ
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249 if (set & GFC_FPE_ZERO)
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250 flags |= FP_X_DZ;
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251 if (clear & GFC_FPE_ZERO)
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252 flags &= ~FP_X_DZ;
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253 #endif
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254
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255 #ifdef FP_X_OFL
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256 if (set & GFC_FPE_OVERFLOW)
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257 flags |= FP_X_OFL;
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258 if (clear & GFC_FPE_OVERFLOW)
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259 flags &= ~FP_X_OFL;
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260 #endif
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261
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262 #ifdef FP_X_UFL
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263 if (set & GFC_FPE_UNDERFLOW)
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264 flags |= FP_X_UFL;
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265 if (clear & GFC_FPE_UNDERFLOW)
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266 flags &= ~FP_X_UFL;
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267 #endif
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268
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269 #ifdef FP_X_DNML
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270 if (set & GFC_FPE_DENORMAL)
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271 flags |= FP_X_DNML;
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272 if (clear & GFC_FPE_DENORMAL)
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273 flags &= ~FP_X_DNML;
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274 #endif
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275
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276 #ifdef FP_X_IMP
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277 if (set & GFC_FPE_INEXACT)
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278 flags |= FP_X_IMP;
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279 if (clear & GFC_FPE_INEXACT)
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280 flags &= ~FP_X_IMP;
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281 #endif
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282
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283 FPSETSTICKY (flags);
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284 }
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285
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286
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287 int
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288 support_fpu_flag (int flag)
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289 {
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290 if (flag & GFC_FPE_INVALID)
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291 {
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292 #ifndef FP_X_INV
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293 return 0;
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294 #endif
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295 }
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296 else if (flag & GFC_FPE_ZERO)
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297 {
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298 #ifndef FP_X_DZ
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299 return 0;
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300 #endif
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301 }
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302 else if (flag & GFC_FPE_OVERFLOW)
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303 {
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304 #ifndef FP_X_OFL
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305 return 0;
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306 #endif
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307 }
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308 else if (flag & GFC_FPE_UNDERFLOW)
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309 {
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310 #ifndef FP_X_UFL
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311 return 0;
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312 #endif
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313 }
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314 else if (flag & GFC_FPE_DENORMAL)
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315 {
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316 #ifndef FP_X_DNML
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317 return 0;
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318 #endif
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319 }
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320 else if (flag & GFC_FPE_INEXACT)
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321 {
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322 #ifndef FP_X_IMP
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323 return 0;
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324 #endif
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325 }
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326
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327 return 1;
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328 }
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329
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330
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331 int
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332 get_fpu_rounding_mode (void)
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333 {
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334 switch (fpgetround ())
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335 {
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336 case FP_RN:
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337 return GFC_FPE_TONEAREST;
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338 case FP_RP:
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339 return GFC_FPE_UPWARD;
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340 case FP_RM:
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341 return GFC_FPE_DOWNWARD;
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342 case FP_RZ:
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343 return GFC_FPE_TOWARDZERO;
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344 default:
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345 return 0; /* Should be unreachable. */
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346 }
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347 }
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348
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349
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350 void
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351 set_fpu_rounding_mode (int mode)
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352 {
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353 FP_RND_TYPE rnd_mode;
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354
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355 switch (mode)
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356 {
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357 case GFC_FPE_TONEAREST:
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358 rnd_mode = FP_RN;
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359 break;
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360 case GFC_FPE_UPWARD:
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361 rnd_mode = FP_RP;
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362 break;
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363 case GFC_FPE_DOWNWARD:
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364 rnd_mode = FP_RM;
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365 break;
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366 case GFC_FPE_TOWARDZERO:
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367 rnd_mode = FP_RZ;
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368 break;
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369 default:
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370 return; /* Should be unreachable. */
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371 }
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372 fpsetround (rnd_mode);
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373 }
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374
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375
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376 int
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377 support_fpu_rounding_mode (int mode __attribute__((unused)))
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378 {
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379 return 1;
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380 }
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381
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382
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383 typedef struct
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384 {
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385 FP_EXCEPT_TYPE mask;
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386 FP_EXCEPT_TYPE sticky;
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387 FP_RND_TYPE round;
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388 } fpu_state_t;
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389
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390
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391 /* Check we can actually store the FPU state in the allocated size. */
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392 _Static_assert (sizeof(fpu_state_t) <= (size_t) GFC_FPE_STATE_BUFFER_SIZE,
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393 "GFC_FPE_STATE_BUFFER_SIZE is too small");
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394
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395
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396 void
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397 get_fpu_state (void *s)
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398 {
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399 fpu_state_t *state = s;
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400
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401 state->mask = fpgetmask ();
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402 state->sticky = fpgetsticky ();
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403 state->round = fpgetround ();
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404 }
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405
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406 void
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407 set_fpu_state (void *s)
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408 {
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409 fpu_state_t *state = s;
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410
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411 fpsetmask (state->mask);
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412 FPSETSTICKY (state->sticky);
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413 fpsetround (state->round);
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414 }
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415
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416
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417 int
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418 support_fpu_underflow_control (int kind __attribute__((unused)))
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419 {
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420 return 0;
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421 }
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422
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423
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424 int
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425 get_fpu_underflow_mode (void)
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426 {
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427 return 0;
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428 }
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429
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430
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431 void
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432 set_fpu_underflow_mode (int gradual __attribute__((unused)))
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433 {
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434 }
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435
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