bc20e36d16
2004-06-14 Bud Davis <bdavis9659@comcast.net>
PR gfortran/15292
* intrinsics/c99_functions.c: Use fpclassify if it exists.
From-SVN: r83116
96 lines
2.1 KiB
C
96 lines
2.1 KiB
C
/* Implementation of various C99 functions
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Copyright (C) 2004 Free Software Foundation, Inc.
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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 Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 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 Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with libgfortran; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include "config.h"
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#include <sys/types.h>
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#include <math.h>
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#include "libgfortran.h"
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/* Note that if HAVE_FPCLASSIFY is not defined, then NaN is not handled */
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/* Algorithm by Steven G. Kargl. */
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#ifndef HAVE_ROUND
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/* Round to nearest integral value. If the argument is halfway between two
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integral values then round away from zero. */
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double
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round(double x)
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{
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double t;
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#ifdef HAVE_FPCLASSIFY
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int i;
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i = fpclassify(x);
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if (i == FP_INFINITE || i == FP_NAN)
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return (x);
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#endif
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if (x >= 0.0)
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{
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t = ceil(x);
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if (t - x > 0.5)
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t -= 1.0;
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return (t);
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}
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else
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{
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t = ceil(-x);
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if (t + x > 0.5)
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t -= 1.0;
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return (-t);
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}
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}
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#endif
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#ifndef HAVE_ROUNDF
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/* Round to nearest integral value. If the argument is halfway between two
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integral values then round away from zero. */
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float
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roundf(float x)
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{
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float t;
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#ifdef HAVE_FPCLASSIFY
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int i;
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i = fpclassify(x);
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if (i == FP_INFINITE || i == FP_NAN)
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return (x);
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#endif
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if (x >= 0.0)
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{
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t = ceilf(x);
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if (t - x > 0.5)
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t -= 1.0;
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return (t);
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}
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else
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{
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t = ceilf(-x);
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if (t + x > 0.5)
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t -= 1.0;
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return (-t);
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}
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}
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#endif
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