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/* Implementation of the RRSPACING 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"

#define MATHFUNC(funcname) funcname ## f

#if defined (HAVE_GFC_REAL_4) && defined (HAVE_FABSF) && defined (HAVE_FREXPF)

extern GFC_REAL_4 rrspacing_r4 (GFC_REAL_4 s, int p);

export_proto(rrspacing_r4);

GFC_REAL_4

rrspacing_r4 (GFC_REAL_4 s, int p)

{

  int e;

  GFC_REAL_4 x;

  x = MATHFUNC(fabs) (s);

  if (x == 0.)

    return 0.;

  MATHFUNC(frexp) (s, &e);

#if defined (HAVE_LDEXPF)

  return MATHFUNC(ldexp) (x, p - e);

#else

  return MATHFUNC(scalbn) (x, p - e);

#endif

}

#endif