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/* Implementation of the SPACING intrinsic

   Copyright 2006, 2007, 2009, 2010 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"

#if defined(GFC_REAL_16_IS_FLOAT128)

#define MATHFUNC(funcname) funcname ## q

#else

#define MATHFUNC(funcname) funcname ## l

#endif

#if defined (HAVE_GFC_REAL_16) && (defined(GFC_REAL_16_IS_FLOAT128) || defined(HAVE_FREXPL))

extern GFC_REAL_16 spacing_r16 (GFC_REAL_16 s, int p, int emin, GFC_REAL_16 tiny);

export_proto(spacing_r16);

GFC_REAL_16

spacing_r16 (GFC_REAL_16 s, int p, int emin, GFC_REAL_16 tiny)

{

  int e;

  if (s == 0.)

    return tiny;

  MATHFUNC(frexp) (s, &e);

  e = e - p;

  e = e > emin ? e : emin;

#if (defined(GFC_REAL_16_IS_FLOAT128) || defined(HAVE_LDEXPL))

  return MATHFUNC(ldexp) (1., e);

#else

  return MATHFUNC(scalbn) (1., e);

#endif

}

#endif