55 lines
1.6 KiB
C
55 lines
1.6 KiB
C
/* Implementation of the RRSPACING intrinsic
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Copyright 2006, 2007, 2009, 2010 Free Software Foundation, Inc.
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Contributed by Steven G. Kargl <kargl@gcc.gnu.org>
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This file is part of the GNU Fortran 95 runtime library (libgfortran).
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Libgfortran is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public
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License as published by the Free Software Foundation; either
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version 3 of the License, or (at your option) any later version.
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Libgfortran is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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#include "libgfortran.h"
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#define MATHFUNC(funcname) funcname
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#if defined (HAVE_GFC_REAL_8) && defined (HAVE_FABS) && defined (HAVE_FREXP)
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extern GFC_REAL_8 rrspacing_r8 (GFC_REAL_8 s, int p);
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export_proto(rrspacing_r8);
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GFC_REAL_8
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rrspacing_r8 (GFC_REAL_8 s, int p)
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{
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int e;
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GFC_REAL_8 x;
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x = MATHFUNC(fabs) (s);
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if (x == 0.)
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return 0.;
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MATHFUNC(frexp) (s, &e);
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#if defined (HAVE_LDEXP)
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return MATHFUNC(ldexp) (x, p - e);
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#else
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return MATHFUNC(scalbn) (x, p - e);
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#endif
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}
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#endif
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