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1 /* Helper functions in C for IEEE modules
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2 Copyright (C) 2013-2020 Free Software Foundation, Inc.
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3 Contributed by Francois-Xavier Coudert <fxcoudert@gcc.gnu.org>
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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 #include "libgfortran.h"
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27
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28 /* Prototypes. */
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29
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30 extern int ieee_class_helper_4 (GFC_REAL_4 *);
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31 internal_proto(ieee_class_helper_4);
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32
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33 extern int ieee_class_helper_8 (GFC_REAL_8 *);
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34 internal_proto(ieee_class_helper_8);
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35
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36 #ifdef HAVE_GFC_REAL_10
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37 extern int ieee_class_helper_10 (GFC_REAL_10 *);
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38 internal_proto(ieee_class_helper_10);
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39 #endif
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40
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41 #ifdef HAVE_GFC_REAL_16
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42 extern int ieee_class_helper_16 (GFC_REAL_16 *);
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43 internal_proto(ieee_class_helper_16);
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44 #endif
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45
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46 /* Enumeration of the possible floating-point types. These values
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47 correspond to the hidden arguments of the IEEE_CLASS_TYPE
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48 derived-type of IEEE_ARITHMETIC. */
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49
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50 enum { IEEE_OTHER_VALUE = 0, IEEE_SIGNALING_NAN, IEEE_QUIET_NAN,
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51 IEEE_NEGATIVE_INF, IEEE_NEGATIVE_NORMAL, IEEE_NEGATIVE_DENORMAL,
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52 IEEE_NEGATIVE_ZERO, IEEE_POSITIVE_ZERO, IEEE_POSITIVE_DENORMAL,
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53 IEEE_POSITIVE_NORMAL, IEEE_POSITIVE_INF, IEEE_SUBNORMAL,
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54 IEEE_NEGATIVE_SUBNORMAL, IEEE_POSITIVE_SUBNORMAL };
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55
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56 #define CLASSMACRO(TYPE) \
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57 int ieee_class_helper_ ## TYPE (GFC_REAL_ ## TYPE *value) \
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58 { \
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59 int res = __builtin_fpclassify (IEEE_QUIET_NAN, IEEE_POSITIVE_INF, \
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60 IEEE_POSITIVE_NORMAL, \
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61 IEEE_POSITIVE_DENORMAL, \
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62 IEEE_POSITIVE_ZERO, *value); \
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63 \
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64 if (__builtin_signbit (*value)) \
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65 { \
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66 if (res == IEEE_POSITIVE_NORMAL) \
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67 return IEEE_NEGATIVE_NORMAL; \
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68 else if (res == IEEE_POSITIVE_DENORMAL) \
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69 return IEEE_NEGATIVE_DENORMAL; \
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70 else if (res == IEEE_POSITIVE_ZERO) \
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71 return IEEE_NEGATIVE_ZERO; \
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72 else if (res == IEEE_POSITIVE_INF) \
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73 return IEEE_NEGATIVE_INF; \
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74 } \
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75 \
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76 if (res == IEEE_QUIET_NAN) \
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77 { \
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78 /* TODO: Handle signaling NaNs */ \
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79 return res; \
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80 } \
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81 \
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82 return res; \
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83 }
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84
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85 CLASSMACRO(4)
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86 CLASSMACRO(8)
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87
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88 #ifdef HAVE_GFC_REAL_10
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89 CLASSMACRO(10)
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90 #endif
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91
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92 #ifdef HAVE_GFC_REAL_16
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93 CLASSMACRO(16)
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94 #endif
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95
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96
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97 #define GFC_FPE_ALL (GFC_FPE_INVALID | GFC_FPE_DENORMAL | \
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98 GFC_FPE_ZERO | GFC_FPE_OVERFLOW | \
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99 GFC_FPE_UNDERFLOW | GFC_FPE_INEXACT)
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100
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101 /* Functions to save and restore floating-point state, clear and restore
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102 exceptions on procedure entry/exit. The rules we follow are set
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103 in Fortran 2008's 14.3 paragraph 3, note 14.4, 14.4 paragraph 4,
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104 14.5 paragraph 2, and 14.6 paragraph 1. */
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105
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106 void ieee_procedure_entry (void *);
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107 export_proto(ieee_procedure_entry);
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108
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109 void
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110 ieee_procedure_entry (void *state)
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111 {
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112 /* Save the floating-point state in the space provided by the caller. */
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113 get_fpu_state (state);
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114
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115 /* Clear the floating-point exceptions. */
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116 set_fpu_except_flags (0, GFC_FPE_ALL);
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117 }
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118
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119
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120 void ieee_procedure_exit (void *);
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121 export_proto(ieee_procedure_exit);
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122
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123 void
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124 ieee_procedure_exit (void *state)
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125 {
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126 /* Get the flags currently signaling. */
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127 int flags = get_fpu_except_flags ();
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128
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129 /* Restore the floating-point state we had on entry. */
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130 set_fpu_state (state);
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131
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132 /* And re-raised the flags that were raised since entry. */
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133 set_fpu_except_flags (flags, 0);
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134 }
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135
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