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annotate liboctave/lo-cieee.c @ 7991:139f47cf17ab

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Change NA value to support single to double precision conversion
author David Bateman <dbateman@free.fr>
date Thu, 05 Jun 2008 21:58:14 +0200
parents 87865ed7405f
children eb63fbe60fab
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1 /*
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2
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3 Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007 John W. Eaton
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4
3cc39e3b8fa5 [project @ 2002-09-27 17:54:53 by jwe]
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5 This file is part of Octave.
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6
3cc39e3b8fa5 [project @ 2002-09-27 17:54:53 by jwe]
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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 3 of the License, or (at your
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10 option) any 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, see
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19 <http://www.gnu.org/licenses/>.
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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 <float.h>
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28
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29 #if defined (HAVE_FLOATINGPOINT_H)
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30 #include <floatingpoint.h>
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31 #endif
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32
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33 #if defined (HAVE_IEEEFP_H)
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34 #include <ieeefp.h>
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35 #endif
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36
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37 #if defined (HAVE_NAN_H)
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38 #if defined (SCO)
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39 #define _IEEE 1
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40 #endif
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41 #include <nan.h>
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42 #if defined (SCO)
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43 #undef _IEEE
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44 #endif
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45 #endif
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46
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47 #include "lo-ieee.h"
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48 #include "lo-math.h"
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49
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50 #if ! defined (HAVE_ISNAN) && defined (HAVE__ISNAN)
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51 #define isnan _isnan
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52 #define HAVE_ISNAN 1
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53 #endif
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54
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55 #if ! defined (HAVE_FINITE) && defined (HAVE__FINITE)
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56 #define finite _finite
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57 #define HAVE_FINITE 1
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58 #endif
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59
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60 #if ! defined (HAVE_COPYSIGN) && defined (HAVE__COPYSIGN)
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61 #define copysign _copysign
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62 #define HAVE_COPYSIGN 1
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63 #endif
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64
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65 #if defined (_AIX) && defined (__GNUG__)
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66 #undef finite
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67 #define finite(x) ((x) < DBL_MAX && (x) > -DBL_MAX)
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68 #endif
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69
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70 /* Octave's idea of infinity. */
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71 double octave_Inf;
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72 float octave_Float_Inf;
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73
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74 /* Octave's idea of a missing value. */
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75 double octave_NA;
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76 float octave_Float_NA;
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77
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78 /* Octave's idea of not a number. */
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79 double octave_NaN;
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80 float octave_Float_NaN;
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81
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82 int lo_ieee_hw;
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83 int lo_ieee_lw;
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84
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85 #if defined (SCO)
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86
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87 int
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88 __isnan (double x)
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89 {
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90 return (IsNANorINF (x) && NaN (x) && ! IsINF (x)) ? 1 : 0;
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91 }
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92
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93 int
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94 __isinf (double x)
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95 {
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96 return (IsNANorINF (x) && IsINF (x)) ? 1 : 0;
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97 }
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98
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99 int
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100 __isnanf (float x)
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101 {
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102 return (IsNANorINF (x) && NaN (x) && ! IsINF (x)) ? 1 : 0;
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103 }
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104
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105 int
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106 __isinff (float x)
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107 {
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108 return (IsNANorINF (x) && IsINF (x)) ? 1 : 0;
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109 }
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110
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111 #endif
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112
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113 int
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114 __lo_ieee_isnan (double x)
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115 {
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116 #if defined (HAVE_ISNAN)
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117 return isnan (x);
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118 #else
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119 return 0;
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120 #endif
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121 }
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122
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123 int
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124 __lo_ieee_finite (double x)
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125 {
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126 #if defined (HAVE_FINITE)
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127 return finite (x) != 0 && ! __lo_ieee_isnan (x);
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128 #elif defined (HAVE_ISINF)
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129 return (! isinf (x) && ! __lo_ieee_isnan (x));
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130 #else
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131 return ! __lo_ieee_isnan (x);
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132 #endif
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133 }
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134
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135 int
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136 __lo_ieee_isinf (double x)
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137 {
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138 #if defined (HAVE_ISINF)
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139 return isinf (x);
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140 #elif defined (HAVE_FINITE)
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141 return (! (finite (x) || __lo_ieee_isnan (x)));
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142 #else
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143 return 0;
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144 #endif
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145 }
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146
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147 int
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148 __lo_ieee_is_NA (double x)
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149 {
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150 #if defined (HAVE_ISNAN)
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151 lo_ieee_double t;
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152 t.value = x;
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153 return (isnan (x) && t.word[lo_ieee_hw] == LO_IEEE_NA_HW
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154 && t.word[lo_ieee_lw] == LO_IEEE_NA_LW) ? 1 : 0;
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155 #else
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156 return 0;
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157 #endif
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158 }
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159
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160 int
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161 __lo_ieee_is_old_NA (double x)
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162 {
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163 #if defined (HAVE_ISNAN)
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164 lo_ieee_double t;
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165 t.value = x;
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166 return (isnan (x) && t.word[lo_ieee_lw] == LO_IEEE_NA_LW_OLD
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167 && t.word[lo_ieee_hw] == LO_IEEE_NA_HW_OLD) ? 1 : 0;
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168 #else
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169 return 0;
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170 #endif
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171 }
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172
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173 double
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174 __lo_ieee_replace_old_NA (double x)
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175 {
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176 if (__lo_ieee_is_old_NA (x))
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177 return lo_ieee_na_value ();
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178 else
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179 return x;
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180 }
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181
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182 int
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183 __lo_ieee_is_NaN_or_NA (double x)
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184 {
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185 return __lo_ieee_isnan (x);
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186 }
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187
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188 double
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189 lo_ieee_inf_value (void)
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190 {
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191 return octave_Inf;
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192 }
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193
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194 double
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195 lo_ieee_na_value (void)
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196 {
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197 return octave_NA;
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198 }
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199
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200 double
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201 lo_ieee_nan_value (void)
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202 {
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203 return octave_NaN;
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204 }
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205
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206 #if ! (defined (signbit) || defined (HAVE_DECL_SIGNBIT)) && defined (HAVE_SIGNBIT)
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207 extern int signbit (double);
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208 #endif
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209
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210 int
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211 __lo_ieee_signbit (double x)
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212 {
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213 /* In the following definitions, only check x < 0 explicitly to avoid
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214 a function call when it looks like signbit or copysign are actually
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215 functions. */
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216
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217 #if defined (signbit)
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218 return signbit (x);
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219 #elif defined (HAVE_SIGNBIT)
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220 return (x < 0 || signbit (x));
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221 #elif defined (copysign)
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222 return (copysign (1.0, x) < 0);
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223 #elif defined (HAVE_COPYSIGN)
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224 return (x < 0 || copysign (1.0, x) < 0);
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225 #else
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226 return x < 0;
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227 #endif
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228 }
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229
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230 int
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231 __lo_ieee_float_isnan (float x)
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232 {
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233 #if defined (HAVE_ISNAN)
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234 return isnan (x);
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235 #else
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236 return 0;
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237 #endif
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238 }
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239
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240 int
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241 __lo_ieee_float_finite (float x)
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242 {
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243 #if defined (HAVE_FINITE)
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244 return finite (x) != 0 && ! __lo_ieee_float_isnan (x);
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245 #elif defined (HAVE_ISINF)
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246 return (! isinf (x) && ! __lo_ieee_float_isnan (x));
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247 #else
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248 return ! __lo_ieee_float_isnan (x);
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249 #endif
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250 }
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251
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252 int
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253 __lo_ieee_float_isinf (float x)
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254 {
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255 #if defined (HAVE_ISINF)
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256 return isinf (x);
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257 #elif defined (HAVE_FINITE)
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258 return (! (finite (x) || __lo_ieee_float_isnan (x)));
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259 #else
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260 return 0;
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261 #endif
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262 }
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263
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264 int
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265 __lo_ieee_float_is_NA (float x)
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266 {
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267 #if defined (HAVE_ISNAN)
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268 lo_ieee_float t;
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269 t.value = x;
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270 return (isnan (x) && (t.word == LO_IEEE_NA_FLOAT)) ? 1 : 0;
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271 #else
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272 return 0;
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273 #endif
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274 }
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275
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276 int
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277 __lo_ieee_float_is_NaN_or_NA (float x)
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278 {
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279 return __lo_ieee_float_isnan (x);
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280 }
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281
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282 float
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283 lo_ieee_float_inf_value (void)
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284 {
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285 return octave_Float_Inf;
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286 }
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287
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288 float
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289 lo_ieee_float_na_value (void)
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290 {
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291 return octave_Float_NA;
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292 }
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293
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294 float
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295 lo_ieee_float_nan_value (void)
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296 {
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297 return octave_Float_NaN;
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298 }
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299
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300 #if ! (defined (signbit) || defined (HAVE_DECL_SIGNBIT)) && defined (HAVE_SIGNBIT)
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301 extern int signbit (float);
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302 #endif
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303
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304 int
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305 __lo_ieee_float_signbit (float x)
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306 {
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307 /* In the following definitions, only check x < 0 explicitly to avoid
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308 a function call when it looks like signbit or copysign are actually
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309 functions. */
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310
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311 #if defined (signbit)
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312 return signbit (x);
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313 #elif defined (HAVE_SIGNBIT)
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314 return (x < 0 || signbit (x));
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315 #elif defined (copysign)
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316 return (copysign (1.0, x) < 0);
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317 #elif defined (HAVE_COPYSIGN)
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318 return (x < 0 || copysign (1.0, x) < 0);
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319 #else
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320 return x < 0;
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321 #endif
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322 }
ab4e64f92526 [project @ 2004-12-18 15:04:20 by jwe]
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323
4072
3cc39e3b8fa5 [project @ 2002-09-27 17:54:53 by jwe]
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324 /*
3cc39e3b8fa5 [project @ 2002-09-27 17:54:53 by jwe]
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325 ;;; Local Variables: ***
3cc39e3b8fa5 [project @ 2002-09-27 17:54:53 by jwe]
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326 ;;; mode: C++ ***
3cc39e3b8fa5 [project @ 2002-09-27 17:54:53 by jwe]
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327 ;;; End: ***
3cc39e3b8fa5 [project @ 2002-09-27 17:54:53 by jwe]
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328 */