58 lines
1.8 KiB
C
58 lines
1.8 KiB
C
/* 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
|