344 lines
5.9 KiB
C
344 lines
5.9 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 General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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In addition to the permissions in the GNU General Public License, the
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Free Software Foundation gives you unlimited permission to link the
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compiled version of this file into combinations with other programs,
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and to distribute those combinations without any restriction coming
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from the use of this file. (The General Public License restrictions
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do apply in other respects; for example, they cover modification of
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the file, and distribution when not linked into a combine
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executable.)
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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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You should have received a copy of the GNU General Public
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License along with libgfortran; see the file COPYING. 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 <float.h>
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#include <math.h>
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#include "libgfortran.h"
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#ifndef HAVE_ACOSF
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float
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acosf(float x)
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{
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return (float) acos(x);
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}
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#endif
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#ifndef HAVE_ASINF
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float
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asinf(float x)
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{
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return (float) asin(x);
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}
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#endif
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#ifndef HAVE_ATAN2F
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float
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atan2f(float y, float x)
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{
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return (float) atan2(y, x);
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}
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#endif
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#ifndef HAVE_ATANF
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float
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atanf(float x)
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{
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return (float) atan(x);
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}
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#endif
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#ifndef HAVE_CEILF
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float
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ceilf(float x)
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{
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return (float) ceil(x);
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}
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#endif
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#ifndef HAVE_COPYSIGNF
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float
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copysignf(float x, float y)
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{
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return (float) copysign(x, y);
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}
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#endif
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#ifndef HAVE_COSF
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float
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cosf(float x)
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{
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return (float) cos(x);
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}
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#endif
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#ifndef HAVE_COSHF
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float
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coshf(float x)
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{
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return (float) cosh(x);
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}
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#endif
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#ifndef HAVE_EXPF
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float
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expf(float x)
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{
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return (float) exp(x);
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}
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#endif
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#ifndef HAVE_FABSF
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float
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fabsf(float x)
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{
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return (float) fabs(x);
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}
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#endif
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#ifndef HAVE_FLOORF
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float
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floorf(float x)
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{
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return (float) floor(x);
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}
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#endif
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#ifndef HAVE_FREXPF
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float
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frexpf(float x, int *exp)
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{
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return (float) frexp(x, exp);
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}
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#endif
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#ifndef HAVE_HYPOTF
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float
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hypotf(float x, float y)
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{
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return (float) hypot(x, y);
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}
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#endif
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#ifndef HAVE_LOGF
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float
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logf(float x)
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{
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return (float) log(x);
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}
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#endif
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#ifndef HAVE_LOG10F
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float
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log10f(float x)
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{
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return (float) log10(x);
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}
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#endif
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#ifndef HAVE_SCALBNF
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float
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scalbnf(float x, int y)
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{
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return (float) scalbn(x, y);
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}
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#endif
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#ifndef HAVE_SINF
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float
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sinf(float x)
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{
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return (float) sin(x);
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}
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#endif
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#ifndef HAVE_SINHF
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float
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sinhf(float x)
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{
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return (float) sinh(x);
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}
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#endif
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#ifndef HAVE_SQRTF
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float
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sqrtf(float x)
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{
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return (float) sqrt(x);
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}
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#endif
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#ifndef HAVE_TANF
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float
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tanf(float x)
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{
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return (float) tan(x);
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}
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#endif
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#ifndef HAVE_TANHF
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float
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tanhf(float x)
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{
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return (float) tanh(x);
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}
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#endif
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#ifndef HAVE_NEXTAFTERF
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/* This is a portable implementation of nextafterf that is intended to be
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independent of the floating point format or its in memory representation.
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This implementation works correctly with denormalized values. */
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float
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nextafterf(float x, float y)
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{
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/* This variable is marked volatile to avoid excess precision problems
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on some platforms, including IA-32. */
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volatile float delta;
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float absx, denorm_min;
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if (isnan(x) || isnan(y))
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return x + y;
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if (x == y)
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return x;
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if (!isfinite (x))
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return x > 0 ? __FLT_MAX__ : - __FLT_MAX__;
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/* absx = fabsf (x); */
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absx = (x < 0.0) ? -x : x;
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/* __FLT_DENORM_MIN__ is non-zero iff the target supports denormals. */
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if (__FLT_DENORM_MIN__ == 0.0f)
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denorm_min = __FLT_MIN__;
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else
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denorm_min = __FLT_DENORM_MIN__;
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if (absx < __FLT_MIN__)
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delta = denorm_min;
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else
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{
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float frac;
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int exp;
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/* Discard the fraction from x. */
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frac = frexpf (absx, &exp);
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delta = scalbnf (0.5f, exp);
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/* Scale x by the epsilon of the representation. By rights we should
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have been able to combine this with scalbnf, but some targets don't
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get that correct with denormals. */
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delta *= __FLT_EPSILON__;
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/* If we're going to be reducing the absolute value of X, and doing so
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would reduce the exponent of X, then the delta to be applied is
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one exponent smaller. */
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if (frac == 0.5f && (y < x) == (x > 0))
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delta *= 0.5f;
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/* If that underflows to zero, then we're back to the minimum. */
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if (delta == 0.0f)
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delta = denorm_min;
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}
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if (y < x)
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delta = -delta;
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return x + delta;
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}
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#endif
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#ifndef HAVE_POWF
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float
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powf(float x, float y)
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{
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return (float) pow(x, y);
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}
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#endif
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/* Note that if 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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#if defined(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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#if defined(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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