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/*
Copyright (C) 1996, 1997 John W. Eaton
This file is part of Octave.
Octave is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 2, or (at your option) any
later version.
Octave is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with Octave; see the file COPYING. If not, write to the Free
Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <cfloat>
#include <cmath>
#if defined (HAVE_FLOATINGPOINT_H)
#include <floatingpoint.h>
#endif
#if defined (HAVE_IEEEFP_H)
#include <ieeefp.h>
#endif
#if defined (HAVE_NAN_H)
#if defined (SCO)
#define _IEEE 1
#endif
#include <nan.h>
#if defined (SCO)
#undef _IEEE
#endif
#endif
#include "lo-error.h"
#include "lo-ieee.h"
#include "mach-info.h"
void
octave_ieee_init (void)
{
// Default values. DBL_MAX is not right for NaN and NA, but do you
// have a better suggestion? If you don't have IEEE floating point
// values, there are many parts of Octave that will not work
// correctly.
octave_Inf = octave_NaN = octave_NA = DBL_MAX;
oct_mach_info::float_format ff = oct_mach_info::native_float_format ();
switch (ff)
{
case oct_mach_info::flt_fmt_ieee_big_endian:
case oct_mach_info::flt_fmt_ieee_little_endian:
{
// Don't optimize away tmp_inf / tmp_inf to generate octave_NaN.
volatile double tmp_inf;
#if defined (SCO)
volatile double tmp = 1.0;
tmp_inf = 1.0 / (tmp - tmp);
#elif defined (__alpha__) && defined (__osf__)
extern unsigned int DINFINITY[2];
tmp_inf = (*(X_CAST(double *, DINFINITY)));
#else
double tmp = 1e+10;
tmp_inf = tmp;
for (;;)
{
tmp_inf *= 1e+10;
if (tmp_inf == tmp)
break;
tmp = tmp_inf;
}
#endif
#if defined (__alpha__) && defined (__osf__)
extern unsigned int DQNAN[2];
octave_NaN = (*(X_CAST(double *, DQNAN)));
#else
octave_NaN = tmp_inf / tmp_inf;
#endif
octave_Inf = tmp_inf;
// This is patterned after code in R.
if (ff == oct_mach_info::flt_fmt_ieee_big_endian)
{
lo_ieee_hw = 0;
lo_ieee_lw = 1;
}
else
{
lo_ieee_hw = 1;
lo_ieee_lw = 0;
}
lo_ieee_double t;
t.word[lo_ieee_hw] = LO_IEEE_NA_HW;
t.word[lo_ieee_lw] = LO_IEEE_NA_LW;
octave_NA = t.value;
}
break;
case oct_mach_info::flt_fmt_cray:
case oct_mach_info::flt_fmt_vax_d:
case oct_mach_info::flt_fmt_vax_g:
break;
default:
// If the format is unknown, then you will probably not have a
// useful system, but we will just issue a warning and go on...
(*current_liboctave_warning_handler)
("lo_ieee_init: unrecognized floating point format!");
}
}
/*
;;; Local Variables: ***
;;; mode: C++ ***
;;; End: ***
*/
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