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annotate liboctave/floatDET.cc @ 7961:a5d1e27ee1f4 ss-3-1-51

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3.1.51 snapshot
author John W. Eaton <jwe@octave.org>
date Tue, 22 Jul 2008 11:40:48 -0400
parents 87865ed7405f
children
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1 /*
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2
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3 Copyright (C) 1994, 1995, 1996, 1997, 2002, 2003, 2004, 2005, 2006,
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4 2007 John W. Eaton
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5
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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
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30 #include "floatDET.h"
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31 #include "lo-mappers.h"
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32 #include "lo-math.h"
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33
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34 bool
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35 FloatDET::value_will_overflow (void) const
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36 {
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37 return base2
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38 ? (e2 + 1 > xlog2 (FLT_MAX) ? 1 : 0)
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39 : (e10 + 1 > log10 (FLT_MAX) ? 1 : 0);
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40 }
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41
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42 bool
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43 FloatDET::value_will_underflow (void) const
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44 {
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45 return base2
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46 ? (e2 - 1 < xlog2 (FLT_MIN) ? 1 : 0)
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47 : (e10 - 1 < log10 (FLT_MIN) ? 1 : 0);
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48 }
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49
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50 void
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51 FloatDET::initialize10 (void)
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52 {
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53 if (c2 != 0.0)
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54 {
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55 float etmp = e2 / xlog2 (static_cast<float>(10));
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56 e10 = static_cast<int> (xround (etmp));
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57 etmp -= e10;
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58 c10 = c2 * powf (10.0, etmp);
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59 }
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60 }
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61
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62 void
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63 FloatDET::initialize2 (void)
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64 {
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65 if (c10 != 0.0)
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66 {
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67 float etmp = e10 / log10 (2.0);
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68 e2 = static_cast<int> (xround (etmp));
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69 etmp -= e2;
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70 c2 = c10 * xexp2 (etmp);
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71 }
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72 }
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73
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74 float
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75 FloatDET::value (void) const
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76 {
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77 return base2 ? c2 * xexp2 (static_cast<float>(e2)) : c10 * powf (10.0, e10);
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78 }
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79
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80 /*
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81 ;;; Local Variables: ***
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82 ;;; mode: C++ ***
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83 ;;; End: ***
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84 */