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annotate liboctave/util/lo-ieee.h @ 19183:a66548dc07b0 stable release-3-8-2

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Version 3.8.2 released. * configure.ac (OCTAVE_VERSION): Now 3.8.2. (OCTAVE_MINOR_VERSION): Now 2. (OCTAVE_RELEASE_DATE): Set to 2014-06-06.
author John W. Eaton <jwe@octave.org>
date Thu, 07 Aug 2014 11:41:28 -0400
parents ebb3ef964372
children 89bd70fae066
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1 /*
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2
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3 Copyright (C) 1996-2013 John W. Eaton
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4
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5 This file is part of Octave.
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6
4cb6aaa0f2c7 [project @ 1996-02-17 02:54:24 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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21 */
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22
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23 #if !defined (octave_lo_ieee_h)
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24 #define octave_lo_ieee_h 1
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26 #ifdef __cplusplus
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27 extern "C" {
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28 #endif
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29
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30 /* Octave's idea of infinity. */
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31 extern OCTAVE_API double octave_Inf;
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32
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33 /* Octave's idea of a missing value. */
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34 extern OCTAVE_API double octave_NA;
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35
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36 /* Octave's idea of not a number. */
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37 extern OCTAVE_API double octave_NaN;
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38
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39 /* Octave's idea of infinity. */
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40 extern OCTAVE_API float octave_Float_Inf;
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41
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42 /* Octave's idea of a missing value. */
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43 extern OCTAVE_API float octave_Float_NA;
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44
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45 /* Octave's idea of not a number. */
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46 extern OCTAVE_API float octave_Float_NaN;
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47
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48 /* FIXME -- this code assumes that a double has twice the
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49 number of bits as an int */
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50
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51 extern OCTAVE_API int lo_ieee_hw;
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52 extern OCTAVE_API int lo_ieee_lw;
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53
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54 typedef union
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55 {
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56 double value;
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57 unsigned int word[2];
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58 } lo_ieee_double;
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60 typedef union
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61 {
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62 float value;
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63 unsigned int word;
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64 } lo_ieee_float;
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65
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66 #define LO_IEEE_NA_HW_OLD 0x7ff00000
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67 #define LO_IEEE_NA_LW_OLD 1954
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68 #define LO_IEEE_NA_HW 0x7FF840F4
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69 #define LO_IEEE_NA_LW 0x40000000
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70 #define LO_IEEE_NA_FLOAT 0x7FC207A2
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71
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72 extern OCTAVE_API void octave_ieee_init (void);
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74 extern OCTAVE_API int __lo_ieee_isnan (double x);
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75 extern OCTAVE_API int __lo_ieee_finite (double x);
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76 extern OCTAVE_API int __lo_ieee_isinf (double x);
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78 extern OCTAVE_API int __lo_ieee_is_NA (double);
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79 extern OCTAVE_API int __lo_ieee_is_old_NA (double);
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80 extern OCTAVE_API int __lo_ieee_is_NaN_or_NA (double) GCC_ATTR_DEPRECATED;
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81 extern OCTAVE_API double __lo_ieee_replace_old_NA (double);
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82
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83 extern OCTAVE_API double lo_ieee_inf_value (void);
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84 extern OCTAVE_API double lo_ieee_na_value (void);
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85 extern OCTAVE_API double lo_ieee_nan_value (void);
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86
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87 extern OCTAVE_API int __lo_ieee_signbit (double);
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88
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89 extern OCTAVE_API int __lo_ieee_float_isnan (float x);
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90 extern OCTAVE_API int __lo_ieee_float_finite (float x);
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91 extern OCTAVE_API int __lo_ieee_float_isinf (float x);
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92
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93 extern OCTAVE_API int __lo_ieee_float_is_NA (float);
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94 extern OCTAVE_API int __lo_ieee_float_is_NaN_or_NA (float) GCC_ATTR_DEPRECATED;
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95
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96 extern OCTAVE_API float lo_ieee_float_inf_value (void);
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97 extern OCTAVE_API float lo_ieee_float_na_value (void);
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98 extern OCTAVE_API float lo_ieee_float_nan_value (void);
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99
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100 extern OCTAVE_API int __lo_ieee_float_signbit (float);
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101
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102 #ifdef __cplusplus
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103 }
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104 #endif
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106 #define lo_ieee_isnan(x) (sizeof (x) == sizeof (float) ? \
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107 __lo_ieee_float_isnan (x) : __lo_ieee_isnan (x))
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108 #define lo_ieee_finite(x) (sizeof (x) == sizeof (float) ? \
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109 __lo_ieee_float_finite (x) : __lo_ieee_finite (x))
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110 #define lo_ieee_isinf(x) (sizeof (x) == sizeof (float) ? \
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111 __lo_ieee_float_isinf (x) : __lo_ieee_isinf (x))
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113
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114 #define lo_ieee_is_NA(x) (sizeof (x) == sizeof (float) ? \
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115 __lo_ieee_float_is_NA (x) : __lo_ieee_is_NA (x))
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116 #define lo_ieee_is_NaN_or_NA(x) (sizeof (x) == sizeof (float) ? \
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117 __lo_ieee_float_is_NaN_or_NA (x) : __lo_ieee_is_NaN_or_NA (x))
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118 #define lo_ieee_signbit(x) (sizeof (x) == sizeof (float) ? \
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119 __lo_ieee_float_signbit (x) : __lo_ieee_signbit (x))
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120
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121 #ifdef __cplusplus
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122
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123 template <typename T>
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124 struct octave_numeric_limits
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125 {
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126 static T NA (void) { return static_cast<T> (0); }
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127 };
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128
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129 template <>
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130 struct octave_numeric_limits<double>
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131 {
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132 static double NA (void) { return octave_NA; }
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133 };
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134
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135 template <>
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136 struct octave_numeric_limits<float>
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137 {
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138 static float NA (void) { return octave_Float_NA; }
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139 };
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140
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141 #endif
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142
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143 #endif