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1967
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1 /* |
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2 |
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3 Copyright (C) 1996 John W. Eaton |
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4 |
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5 This file is part of Octave. |
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6 |
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7 Octave is free software; you can redistribute it and/or modify it |
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8 under the terms of the GNU General Public License as published by the |
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9 Free Software Foundation; either version 2, or (at your option) any |
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10 later version. |
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11 |
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12 Octave is distributed in the hope that it will be useful, but WITHOUT |
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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15 for more details. |
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16 |
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17 You should have received a copy of the GNU General Public License |
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18 along with Octave; see the file COPYING. If not, write to the Free |
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19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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20 |
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21 */ |
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22 |
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23 #ifdef HAVE_CONFIG_H |
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24 #include <config.h> |
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25 #endif |
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26 |
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27 #include <cfloat> |
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28 #include <cmath> |
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1967
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29 |
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30 #if defined (HAVE_FLOATINGPOINT_H) |
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31 #include <floatingpoint.h> |
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32 #endif |
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33 |
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2598
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34 #if defined (HAVE_NAN_H) |
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35 #if defined (SCO) |
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2560
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36 #define _IEEE 1 |
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2598
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37 #endif |
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2508
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38 #include <nan.h> |
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2598
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39 #if defined (SCO) |
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2560
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40 #undef _IEEE |
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2508
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41 #endif |
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2598
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42 #endif |
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2508
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43 |
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2668
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44 #if defined (HAVE_INFINITY) |
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2702
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45 extern "C" double infinity (); |
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2668
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46 #endif |
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47 |
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48 #if defined (HAVE_QUIET_NAN) |
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2702
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49 extern "C" double quiet_nan (long); |
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2668
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50 #endif |
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51 |
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1967
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52 #include "lo-ieee.h" |
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53 |
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54 // Octave's idea of infinity. |
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55 double octave_Inf; |
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56 |
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57 // Octave's idea of not a number. |
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58 double octave_NaN; |
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59 |
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60 void |
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61 octave_ieee_init (void) |
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62 { |
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63 #if defined (HAVE_ISINF) || defined (HAVE_FINITE) |
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64 |
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65 // Some version of gcc on some old version of Linux used to crash when |
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66 // trying to make Inf and NaN. |
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67 |
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68 #if defined (HAVE_INFINITY) |
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2668
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69 octave_Inf = infinity (); |
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1967
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70 #elif defined (linux) |
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71 octave_Inf = HUGE_VAL; |
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72 #elif defined (__alpha__) |
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73 extern unsigned int DINFINITY[2]; |
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74 octave_Inf = (*((double *) (DINFINITY))); |
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2560
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75 #elif defined (SCO) |
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76 double tmp = 1.0; |
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77 octave_Inf = 1.0 / (tmp - tmp); |
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1967
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78 #else |
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79 double tmp = 1e+10; |
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80 octave_Inf = tmp; |
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81 for (;;) |
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82 { |
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83 octave_Inf *= 1e+10; |
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84 if (octave_Inf == tmp) |
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85 break; |
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86 tmp = octave_Inf; |
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87 } |
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88 #endif |
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89 |
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90 #endif |
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91 |
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92 #if defined (HAVE_ISNAN) |
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93 |
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94 #if defined (HAVE_QUIET_NAN) |
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2668
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95 octave_NaN = quiet_nan (0L); |
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1967
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96 #elif defined (linux) |
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97 octave_NaN = NAN; |
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98 #elif defined (__alpha__) |
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99 extern unsigned int DQNAN[2]; |
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100 octave_NaN = (*((double *) (DQNAN))); |
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101 #else |
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102 octave_NaN = octave_Inf / octave_Inf; |
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103 #endif |
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104 |
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105 #endif |
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106 } |
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107 |
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2508
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108 #if defined (SCO) |
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109 |
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110 extern "C" int |
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111 isnan (double x) |
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112 { |
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113 return (IsNANorINF (x) && NaN (x) && ! IsINF (x)) ? 1 : 0; |
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114 } |
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115 |
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116 extern "C" int |
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117 isinf (double x) |
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118 { |
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119 return (IsNANorINF (x) && IsINF (x)) ? 1 : 0; |
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2508
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120 } |
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121 |
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122 #endif |
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123 |
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1967
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124 /* |
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125 ;;; Local Variables: *** |
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126 ;;; mode: C++ *** |
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127 ;;; End: *** |
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128 */ |
