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annotate liboctave/lo-ieee.cc @ 14626:f947d2922feb stable rc-3-6-2-0

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3.6.2-rc0 release candidate * configure.ac (AC_INIT): Version is now 3.6.2-rc0. (OCTAVE_RELEASE_DATE): Now 2012-05-11.
author John W. Eaton <jwe@octave.org>
date Fri, 11 May 2012 13:46:18 -0400
parents 72c96de7a403
children
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1 /*
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2
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72c96de7a403 maint: update copyright notices for 2012
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3 Copyright (C) 1996-2012 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 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 <cstdlib>
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29 #include <limits>
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30
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31 #include "lo-error.h"
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32 #include "lo-ieee.h"
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33 #include "mach-info.h"
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34
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35 void
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36 octave_ieee_init (void)
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37 {
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38 oct_mach_info::float_format ff = oct_mach_info::native_float_format ();
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39
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40 switch (ff)
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41 {
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42 case oct_mach_info::flt_fmt_ieee_big_endian:
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43 case oct_mach_info::flt_fmt_ieee_little_endian:
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44 {
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45 octave_NaN = std::numeric_limits<double>::quiet_NaN ();
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46 octave_Inf = std::numeric_limits<double>::infinity ();
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47
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48 octave_Float_NaN = std::numeric_limits<float>::quiet_NaN ();
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49 octave_Float_Inf = std::numeric_limits<float>::infinity ();
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50
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51 // The following is patterned after code in R.
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52
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53 if (ff == oct_mach_info::flt_fmt_ieee_big_endian)
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54 {
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55 lo_ieee_hw = 0;
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56 lo_ieee_lw = 1;
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57 }
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58 else
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59 {
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60 lo_ieee_hw = 1;
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61 lo_ieee_lw = 0;
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62 }
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63
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64 lo_ieee_double t;
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65 t.word[lo_ieee_hw] = LO_IEEE_NA_HW;
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66 t.word[lo_ieee_lw] = LO_IEEE_NA_LW;
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67
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68 octave_NA = t.value;
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70 lo_ieee_float tf;
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71 tf.word = LO_IEEE_NA_FLOAT;
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72 octave_Float_NA = tf.value;
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73 }
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74 break;
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75
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76 case oct_mach_info::flt_fmt_cray:
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77 case oct_mach_info::flt_fmt_vax_d:
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78 case oct_mach_info::flt_fmt_vax_g:
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79 default:
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80 // If the format is unknown, then you will probably not have a
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81 // useful system, so we will abort here. Anyone wishing to
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82 // experiment with building Octave on a system without IEEE
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83 // floating point should be capable of removing this check and
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84 // the configure test.
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85 (*current_liboctave_error_handler)
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86 ("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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87 abort ();
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88 }
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89 }