libgfortran/m4/spacing.m4

`/* Implementation of the SPACING intrinsic
   Copyright (C) 2006-2014 Free Software Foundation, Inc.
   Contributed by Steven G. Kargl <kargl@gcc.gnu.org>

This file is part of the GNU Fortran 95 runtime library (libgfortran).

Libgfortran 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 3 of the License, or (at your option) any later version.

Libgfortran 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.

Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.

You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
<http://www.gnu.org/licenses/>.  */

#include "libgfortran.h"'

include(`mtype.m4')dnl

mathfunc_macro

`#if defined (HAVE_'real_type`) && 'hasmathfunc(frexp)`

extern 'real_type` spacing_r'kind` ('real_type` s, int p, int emin, 'real_type` tiny);
export_proto(spacing_r'kind`);

'real_type`
spacing_r'kind` ('real_type` s, int p, int emin, 'real_type` tiny)
{
  int e;
  if (s == 0.)
    return tiny;
  MATHFUNC(frexp) (s, &e);
  e = e - p;
  e = e > emin ? e : emin;
#if 'hasmathfunc(ldexp)`
  return MATHFUNC(ldexp) (1., e);
#else
  return MATHFUNC(scalbn) (1., e);
#endif
}

#endif'