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1 /* |
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2 |
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3 Copyright (C) 1996, 1997 John W. Eaton |
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1967
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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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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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3268
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34 #if defined (HAVE_IEEEFP_H) |
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35 #include <ieeefp.h> |
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36 #endif |
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37 |
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2598
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38 #if defined (HAVE_NAN_H) |
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39 #if defined (SCO) |
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2560
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40 #define _IEEE 1 |
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2598
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41 #endif |
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2508
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42 #include <nan.h> |
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2598
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43 #if defined (SCO) |
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2560
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44 #undef _IEEE |
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2508
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45 #endif |
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2598
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46 #endif |
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2508
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47 |
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48 #include "lo-error.h" |
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49 #include "lo-ieee.h" |
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4025
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50 #include "mach-info.h" |
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51 |
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52 void |
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53 octave_ieee_init (void) |
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54 { |
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55 // Default values. DBL_MAX is not right for NaN and NA, but do you |
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56 // have a better suggestion? If you don't have IEEE floating point |
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57 // values, there are many parts of Octave that will not work |
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58 // correctly. |
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59 |
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60 octave_Inf = octave_NaN = octave_NA = DBL_MAX; |
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61 |
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62 oct_mach_info::float_format ff = oct_mach_info::native_float_format (); |
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63 |
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4698
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64 switch (ff) |
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65 { |
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66 case oct_mach_info::flt_fmt_ieee_big_endian: |
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67 case oct_mach_info::flt_fmt_ieee_little_endian: |
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68 { |
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69 // Don't optimize away tmp_inf / tmp_inf to generate octave_NaN. |
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70 |
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71 volatile double tmp_inf; |
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72 |
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2713
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73 #if defined (SCO) |
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74 volatile double tmp = 1.0; |
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75 tmp_inf = 1.0 / (tmp - tmp); |
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76 #elif defined (__alpha__) && defined (__osf__) |
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77 extern unsigned int DINFINITY[2]; |
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78 tmp_inf = (*(X_CAST(double *, DINFINITY))); |
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79 #else |
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80 double tmp = 1e+10; |
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81 tmp_inf = tmp; |
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82 for (;;) |
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83 { |
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84 tmp_inf *= 1e+10; |
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85 if (tmp_inf == tmp) |
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86 break; |
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87 tmp = tmp_inf; |
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88 } |
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89 #endif |
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90 |
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91 #if defined (__alpha__) && defined (__osf__) |
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92 extern unsigned int DQNAN[2]; |
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93 octave_NaN = (*(X_CAST(double *, DQNAN))); |
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94 #else |
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95 octave_NaN = tmp_inf / tmp_inf; |
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96 #endif |
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97 |
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98 octave_Inf = tmp_inf; |
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99 |
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100 // This is patterned after code in R. |
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101 |
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102 if (ff == oct_mach_info::flt_fmt_ieee_big_endian) |
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103 { |
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104 lo_ieee_hw = 0; |
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105 lo_ieee_lw = 1; |
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106 } |
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107 else |
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108 { |
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109 lo_ieee_hw = 1; |
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110 lo_ieee_lw = 0; |
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111 } |
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112 |
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113 lo_ieee_double t; |
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114 t.word[lo_ieee_hw] = LO_IEEE_NA_HW; |
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115 t.word[lo_ieee_lw] = LO_IEEE_NA_LW; |
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116 |
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117 octave_NA = t.value; |
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118 } |
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119 break; |
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120 |
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121 case oct_mach_info::flt_fmt_cray: |
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122 case oct_mach_info::flt_fmt_vax_d: |
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123 case oct_mach_info::flt_fmt_vax_g: |
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124 break; |
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125 |
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126 default: |
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127 // If the format is unknown, then you will probably not have a |
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128 // useful system, but we will just issue a warning and go on... |
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129 (*current_liboctave_warning_handler) |
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130 ("lo_ieee_init: unrecognized floating point format!"); |
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4601
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131 } |
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132 } |
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133 |
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134 /* |
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135 ;;; Local Variables: *** |
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136 ;;; mode: C++ *** |
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137 ;;; End: *** |
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138 */ |
