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annotate liboctave/lo-ieee.cc @ 10454:79a56d0a6a0d ss-3-3-51

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version is now 3.3.51
author John W. Eaton <jwe@octave.org>
date Wed, 24 Mar 2010 16:27:05 -0400
parents 07ebe522dac2
children 2f36145742c9
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1 /*
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2
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3 Copyright (C) 1996, 1997, 1998, 1999, 2000, 2002, 2003, 2004, 2005,
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4 2007, 2008, 2009 John W. Eaton
1967
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5
4cb6aaa0f2c7 [project @ 1996-02-17 02:54:24 by jwe]
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6 This file is part of Octave.
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7
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8 Octave is free software; you can redistribute it and/or modify it
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9 under the terms of the GNU General Public License as published by the
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10 Free Software Foundation; either version 3 of the License, or (at your
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11 option) any later version.
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12
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13 Octave is distributed in the hope that it will be useful, but WITHOUT
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14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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16 for more details.
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17
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18 You should have received a copy of the GNU General Public License
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19 along with Octave; see the file COPYING. If not, see
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20 <http://www.gnu.org/licenses/>.
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21
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22 */
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23
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24 #ifdef HAVE_CONFIG_H
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25 #include <config.h>
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26 #endif
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27
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28 #include <cfloat>
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29 #include <cstdlib>
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30
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31 #if defined (HAVE_FLOATINGPOINT_H)
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32 #include <floatingpoint.h>
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33 #endif
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34
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35 #if defined (HAVE_IEEEFP_H)
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36 #include <ieeefp.h>
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37 #endif
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38
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39 #if defined (HAVE_NAN_H)
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40 #if defined (SCO)
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41 #define _IEEE 1
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42 #endif
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43 #include <nan.h>
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44 #if defined (SCO)
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45 #undef _IEEE
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46 #endif
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47 #endif
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48
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49 #include "lo-error.h"
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50 #include "lo-ieee.h"
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51 #include "lo-math.h"
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52 #include "mach-info.h"
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53
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54 void
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55 octave_ieee_init (void)
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56 {
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57 // Default values. DBL_MAX is not right for NaN and NA, but do you
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58 // have a better suggestion? If you don't have IEEE floating point
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59 // values, there are many parts of Octave that will not work
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60 // correctly.
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61
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62 octave_Inf = octave_NaN = octave_NA = DBL_MAX;
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63 octave_Float_Inf = octave_Float_NaN = octave_Float_NA = FLT_MAX;
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64
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65 oct_mach_info::float_format ff = oct_mach_info::native_float_format ();
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66
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67 switch (ff)
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68 {
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69 case oct_mach_info::flt_fmt_ieee_big_endian:
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70 case oct_mach_info::flt_fmt_ieee_little_endian:
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71 {
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72 // Don't optimize away tmp_inf / tmp_inf to generate octave_NaN.
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73
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74 volatile double tmp_inf;
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75
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76 #if defined (SCO)
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77 volatile double tmp = 1.0;
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78 tmp_inf = 1.0 / (tmp - tmp);
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79 #elif defined (__alpha__) && defined (__osf__)
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80 extern unsigned int DINFINITY[2];
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81 tmp_inf = (*(X_CAST(double *, DINFINITY)));
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82 #else
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83 double tmp = 1e+10;
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84 tmp_inf = tmp;
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85 for (;;)
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86 {
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87 tmp_inf *= 1e+10;
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88 if (tmp_inf == tmp)
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89 break;
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90 tmp = tmp_inf;
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91 }
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92 #endif
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93
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94 #if defined (__alpha__) && defined (__osf__)
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95 extern unsigned int DQNAN[2];
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96 octave_NaN = (*(X_CAST(double *, DQNAN)));
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97 #elif defined (__NetBSD__)
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98 octave_NaN = nan ("");
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99 #else
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100 octave_NaN = tmp_inf / tmp_inf;
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101 // try to ensure that lo_ieee_sign gives false for a NaN.
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102 if (lo_ieee_signbit (octave_NaN))
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103 octave_NaN = -octave_NaN;
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104
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105 #endif
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106
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107 octave_Inf = tmp_inf;
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108
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109 // This is patterned after code in R.
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110
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111 if (ff == oct_mach_info::flt_fmt_ieee_big_endian)
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112 {
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113 lo_ieee_hw = 0;
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114 lo_ieee_lw = 1;
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115 }
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116 else
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117 {
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118 lo_ieee_hw = 1;
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119 lo_ieee_lw = 0;
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120 }
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121
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122 lo_ieee_double t;
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123 t.word[lo_ieee_hw] = LO_IEEE_NA_HW;
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124 t.word[lo_ieee_lw] = LO_IEEE_NA_LW;
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125
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126 octave_NA = t.value;
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127
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128 volatile float float_tmp_inf;
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129
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130 #if defined (SCO)
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131 volatile float float_tmp = 1.0;
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132 float_tmp_inf = 1.0 / (float_tmp - float_tmp);
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133 #else
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134 float float_tmp = 1e+10;
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135 float_tmp_inf = float_tmp;
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136 for (;;)
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137 {
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138 float_tmp_inf *= 1e+10;
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139 if (float_tmp_inf == float_tmp)
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140 break;
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141 float_tmp = float_tmp_inf;
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142 }
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143 #endif
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144
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145 #if defined (__NetBSD__)
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146 octave_Float_NaN = nanf ("");
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147 #else
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148 octave_Float_NaN = float_tmp_inf / float_tmp_inf;
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149 #endif
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150 octave_Float_Inf = float_tmp_inf;
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151
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152 lo_ieee_float tf;
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153 tf.word = LO_IEEE_NA_FLOAT;
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154 octave_Float_NA = tf.value;
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155 }
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156 break;
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157
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158 case oct_mach_info::flt_fmt_cray:
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159 case oct_mach_info::flt_fmt_vax_d:
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160 case oct_mach_info::flt_fmt_vax_g:
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161 default:
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162 // If the format is unknown, then you will probably not have a
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163 // useful system, so we will abort here. Anyone wishing to
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164 // experiment with building Octave on a system without IEEE
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165 // floating point should be capable of removing this check and
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166 // the configure test.
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167 (*current_liboctave_error_handler)
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168 ("lo_ieee_init: floating point format is not IEEE! Maybe DLAMCH is miscompiled, or you are using some strange system without IEEE floating point math?");
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169 abort ();
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170 }
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171 }