libgfortran/generated/spacing_r4.c

   1 /* Implementation of the SPACING intrinsic
   2    Copyright 2006, 2007, 2009 Free Software Foundation, Inc.
   3    Contributed by Steven G. Kargl <kargl@gcc.gnu.org>
   4
   5 This file is part of the GNU Fortran 95 runtime library (libgfortran).
   6
   7 Libgfortran is free software; you can redistribute it and/or
   8 modify it under the terms of the GNU General Public
   9 License as published by the Free Software Foundation; either
  10 version 3 of the License, or (at your option) any later version.
  11
  12 Libgfortran is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 Under Section 7 of GPL version 3, you are granted additional
  18 permissions described in the GCC Runtime Library Exception, version
  19 3.1, as published by the Free Software Foundation.
  20
  21 You should have received a copy of the GNU General Public License and
  22 a copy of the GCC Runtime Library Exception along with this program;
  23 see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  24 <http://www.gnu.org/licenses/>.  */
  25
  26 #include "libgfortran.h"
  27
  28
  29
  30 #define MATHFUNC(funcname) funcname ## f
  31
  32 #if defined (HAVE_GFC_REAL_4) && defined (HAVE_FREXPF)
  33
  34 extern GFC_REAL_4 spacing_r4 (GFC_REAL_4 s, int p, int emin, GFC_REAL_4 tiny);
  35 export_proto(spacing_r4);
  36
  37 GFC_REAL_4
  38 spacing_r4 (GFC_REAL_4 s, int p, int emin, GFC_REAL_4 tiny)
  39 {
  40   int e;
  41   if (s == 0.)
  42     return tiny;
  43   MATHFUNC(frexp) (s, &e);
  44   e = e - p;
  45   e = e > emin ? e : emin;
  46 #if defined (HAVE_LDEXPF)
  47   return MATHFUNC(ldexp) (1., e);
  48 #else
  49   return MATHFUNC(scalbn) (1., e);
  50 #endif
  51 }
  52
  53 #endif