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111
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1 /* AIX FPU-related code.
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145
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2 Copyright (C) 2005-2020 Free Software Foundation, Inc.
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111
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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
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27 /* FPU-related code for AIX. */
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28 #ifdef HAVE_FPTRAP_H
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29 #include <fptrap.h>
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30 #endif
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31
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32 #ifdef HAVE_FPXCP_H
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33 #include <fpxcp.h>
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34 #endif
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35
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36 #ifdef HAVE_FENV_H
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37 #include <fenv.h>
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38 #endif
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39
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40
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41 /* Check we can actually store the FPU state in the allocated size. */
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42 _Static_assert (sizeof(fenv_t) <= (size_t) GFC_FPE_STATE_BUFFER_SIZE,
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43 "GFC_FPE_STATE_BUFFER_SIZE is too small");
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44
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45
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46 void
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47 set_fpu_trap_exceptions (int trap, int notrap)
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48 {
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49 fptrap_t mode_set = 0, mode_clr = 0;
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50
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51 #ifdef TRP_INVALID
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52 if (trap & GFC_FPE_INVALID)
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53 mode_set |= TRP_INVALID;
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54 if (notrap & GFC_FPE_INVALID)
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55 mode_clr |= TRP_INVALID;
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56 #endif
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57
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58 #ifdef TRP_DIV_BY_ZERO
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59 if (trap & GFC_FPE_ZERO)
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60 mode_set |= TRP_DIV_BY_ZERO;
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61 if (notrap & GFC_FPE_ZERO)
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62 mode_clr |= TRP_DIV_BY_ZERO;
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63 #endif
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64
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65 #ifdef TRP_OVERFLOW
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66 if (trap & GFC_FPE_OVERFLOW)
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67 mode_set |= TRP_OVERFLOW;
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68 if (notrap & GFC_FPE_OVERFLOW)
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69 mode_clr |= TRP_OVERFLOW;
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70 #endif
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71
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72 #ifdef TRP_UNDERFLOW
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73 if (trap & GFC_FPE_UNDERFLOW)
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74 mode_set |= TRP_UNDERFLOW;
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75 if (notrap & GFC_FPE_UNDERFLOW)
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76 mode_clr |= TRP_UNDERFLOW;
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77 #endif
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78
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79 #ifdef TRP_INEXACT
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80 if (trap & GFC_FPE_INEXACT)
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81 mode_set |= TRP_INEXACT;
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82 if (notrap & GFC_FPE_INEXACT)
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83 mode_clr |= TRP_INEXACT;
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84 #endif
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85
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86 fp_trap (FP_TRAP_SYNC);
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87 fp_enable (mode_set);
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88 fp_disable (mode_clr);
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89 }
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90
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91
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92 int
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93 get_fpu_trap_exceptions (void)
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94 {
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95 int res = 0;
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96
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97 #ifdef TRP_INVALID
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98 if (fp_is_enabled (TRP_INVALID))
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99 res |= GFC_FPE_INVALID;
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100 #endif
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101
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102 #ifdef TRP_DIV_BY_ZERO
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103 if (fp_is_enabled (TRP_DIV_BY_ZERO))
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104 res |= GFC_FPE_ZERO;
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105 #endif
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106
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107 #ifdef TRP_OVERFLOW
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108 if (fp_is_enabled (TRP_OVERFLOW))
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109 res |= GFC_FPE_OVERFLOW;
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110 #endif
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111
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112 #ifdef TRP_UNDERFLOW
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113 if (fp_is_enabled (TRP_UNDERFLOW))
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114 res |= GFC_FPE_UNDERFLOW;
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115 #endif
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116
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117 #ifdef TRP_INEXACT
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118 if (fp_is_enabled (TRP_INEXACT))
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119 res |= GFC_FPE_INEXACT;
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120 #endif
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121
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122 return res;
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123 }
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124
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125
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126 int
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127 support_fpu_trap (int flag)
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128 {
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129 return support_fpu_flag (flag);
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130 }
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131
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132
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133 void
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134 set_fpu (void)
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135 {
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136 #ifndef TRP_INVALID
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137 if (options.fpe & GFC_FPE_INVALID)
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138 estr_write ("Fortran runtime warning: IEEE 'invalid operation' "
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139 "exception not supported.\n");
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140 #endif
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141
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142 if (options.fpe & GFC_FPE_DENORMAL)
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143 estr_write ("Fortran runtime warning: Floating point 'denormal operand' "
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144 "exception not supported.\n");
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145
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146 #ifndef TRP_DIV_BY_ZERO
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147 if (options.fpe & GFC_FPE_ZERO)
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148 estr_write ("Fortran runtime warning: IEEE 'division by zero' "
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149 "exception not supported.\n");
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150 #endif
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151
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152 #ifndef TRP_OVERFLOW
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153 if (options.fpe & GFC_FPE_OVERFLOW)
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154 estr_write ("Fortran runtime warning: IEEE 'overflow' "
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155 "exception not supported.\n");
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156 #endif
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157
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158 #ifndef TRP_UNDERFLOW
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159 if (options.fpe & GFC_FPE_UNDERFLOW)
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160 estr_write ("Fortran runtime warning: IEEE 'underflow' "
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161 "exception not supported.\n");
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162 #endif
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163
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164 #ifndef TRP_INEXACT
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165 if (options.fpe & GFC_FPE_INEXACT)
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166 estr_write ("Fortran runtime warning: IEEE 'inexact' "
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167 "exception not supported.\n");
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168 #endif
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169
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170 set_fpu_trap_exceptions (options.fpe, 0);
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171 }
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172
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173 int
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174 get_fpu_except_flags (void)
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175 {
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176 int result, set_excepts;
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177
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178 result = 0;
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179
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180 #ifdef HAVE_FPXCP_H
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181 if (!fp_any_xcp ())
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182 return 0;
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183
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184 if (fp_invalid_op ())
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185 result |= GFC_FPE_INVALID;
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186
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187 if (fp_divbyzero ())
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188 result |= GFC_FPE_ZERO;
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189
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190 if (fp_overflow ())
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191 result |= GFC_FPE_OVERFLOW;
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192
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193 if (fp_underflow ())
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194 result |= GFC_FPE_UNDERFLOW;
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195
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196 if (fp_inexact ())
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197 result |= GFC_FPE_INEXACT;
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198 #endif
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199
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200 return result;
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201 }
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202
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203
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204 void
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205 set_fpu_except_flags (int set, int clear)
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206 {
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207 int exc_set = 0, exc_clr = 0;
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208
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209 #ifdef FP_INVALID
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210 if (set & GFC_FPE_INVALID)
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211 exc_set |= FP_INVALID;
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212 else if (clear & GFC_FPE_INVALID)
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213 exc_clr |= FP_INVALID;
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214 #endif
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215
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216 #ifdef FP_DIV_BY_ZERO
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217 if (set & GFC_FPE_ZERO)
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218 exc_set |= FP_DIV_BY_ZERO;
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219 else if (clear & GFC_FPE_ZERO)
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220 exc_clr |= FP_DIV_BY_ZERO;
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221 #endif
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222
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223 #ifdef FP_OVERFLOW
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224 if (set & GFC_FPE_OVERFLOW)
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225 exc_set |= FP_OVERFLOW;
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226 else if (clear & GFC_FPE_OVERFLOW)
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227 exc_clr |= FP_OVERFLOW;
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228 #endif
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229
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230 #ifdef FP_UNDERFLOW
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231 if (set & GFC_FPE_UNDERFLOW)
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232 exc_set |= FP_UNDERFLOW;
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233 else if (clear & GFC_FPE_UNDERFLOW)
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234 exc_clr |= FP_UNDERFLOW;
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235 #endif
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236
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237 /* AIX does not have FP_DENORMAL. */
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238
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239 #ifdef FP_INEXACT
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240 if (set & GFC_FPE_INEXACT)
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241 exc_set |= FP_INEXACT;
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242 else if (clear & GFC_FPE_INEXACT)
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243 exc_clr |= FP_INEXACT;
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244 #endif
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245
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246 fp_clr_flag (exc_clr);
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247 fp_set_flag (exc_set);
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248 }
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249
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250
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251 int
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252 support_fpu_flag (int flag)
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253 {
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254 if (flag & GFC_FPE_INVALID)
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255 {
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256 #ifndef FP_INVALID
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257 return 0;
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258 #endif
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259 }
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260 else if (flag & GFC_FPE_ZERO)
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261 {
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262 #ifndef FP_DIV_BY_ZERO
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263 return 0;
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264 #endif
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265 }
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266 else if (flag & GFC_FPE_OVERFLOW)
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267 {
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268 #ifndef FP_OVERFLOW
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269 return 0;
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270 #endif
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271 }
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272 else if (flag & GFC_FPE_UNDERFLOW)
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273 {
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274 #ifndef FP_UNDERFLOW
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275 return 0;
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276 #endif
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277 }
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278 else if (flag & GFC_FPE_DENORMAL)
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279 {
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280 /* AIX does not support denormal flag. */
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281 return 0;
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282 }
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283 else if (flag & GFC_FPE_INEXACT)
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284 {
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285 #ifndef FP_INEXACT
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286 return 0;
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287 #endif
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288 }
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289
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290 return 1;
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291 }
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292
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293
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294 int
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295 get_fpu_rounding_mode (void)
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296 {
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297 int rnd_mode;
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298
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299 rnd_mode = fegetround ();
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300
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301 switch (rnd_mode)
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302 {
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303 #ifdef FE_TONEAREST
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304 case FE_TONEAREST:
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305 return GFC_FPE_TONEAREST;
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306 #endif
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307
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308 #ifdef FE_UPWARD
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309 case FE_UPWARD:
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310 return GFC_FPE_UPWARD;
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311 #endif
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312
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313 #ifdef FE_DOWNWARD
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314 case FE_DOWNWARD:
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315 return GFC_FPE_DOWNWARD;
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316 #endif
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317
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318 #ifdef FE_TOWARDZERO
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319 case FE_TOWARDZERO:
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320 return GFC_FPE_TOWARDZERO;
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321 #endif
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322
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323 default:
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324 return 0; /* Should be unreachable. */
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325 }
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326 }
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327
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328
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329 void
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330 set_fpu_rounding_mode (int mode)
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331 {
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332 int rnd_mode;
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333
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334 switch (mode)
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335 {
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336 #ifdef FE_TONEAREST
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337 case GFC_FPE_TONEAREST:
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338 rnd_mode = FE_TONEAREST;
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339 break;
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340 #endif
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341
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342 #ifdef FE_UPWARD
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343 case GFC_FPE_UPWARD:
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344 rnd_mode = FE_UPWARD;
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345 break;
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346 #endif
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347
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348 #ifdef FE_DOWNWARD
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349 case GFC_FPE_DOWNWARD:
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350 rnd_mode = FE_DOWNWARD;
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351 break;
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352 #endif
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353
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354 #ifdef FE_TOWARDZERO
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355 case GFC_FPE_TOWARDZERO:
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356 rnd_mode = FE_TOWARDZERO;
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357 break;
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358 #endif
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359
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360 default:
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361 return; /* Should be unreachable. */
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362 }
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363
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364 fesetround (rnd_mode);
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365 }
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366
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367
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368 int
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369 support_fpu_rounding_mode (int mode)
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370 {
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371 switch (mode)
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372 {
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373 case GFC_FPE_TONEAREST:
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374 #ifdef FE_TONEAREST
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375 return 1;
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376 #else
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377 return 0;
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378 #endif
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379
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380 case GFC_FPE_UPWARD:
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381 #ifdef FE_UPWARD
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382 return 1;
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383 #else
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384 return 0;
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385 #endif
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386
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387 case GFC_FPE_DOWNWARD:
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388 #ifdef FE_DOWNWARD
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389 return 1;
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390 #else
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391 return 0;
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392 #endif
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393
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394 case GFC_FPE_TOWARDZERO:
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395 #ifdef FE_TOWARDZERO
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396 return 1;
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397 #else
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398 return 0;
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399 #endif
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400
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401 default:
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402 return 0; /* Should be unreachable. */
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403 }
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404 }
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405
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406
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407
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408 void
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409 get_fpu_state (void *state)
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410 {
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411 fegetenv (state);
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412 }
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413
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414 void
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415 set_fpu_state (void *state)
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416 {
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417 fesetenv (state);
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418 }
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419
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420
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421 int
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422 support_fpu_underflow_control (int kind __attribute__((unused)))
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423 {
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424 return 0;
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425 }
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426
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427
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428 int
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429 get_fpu_underflow_mode (void)
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430 {
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431 return 0;
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432 }
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433
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434
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435 void
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436 set_fpu_underflow_mode (int gradual __attribute__((unused)))
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437 {
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438 }
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439
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