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0ac5ae2335
libm is now somewhat integrated with gcc's -ffinite-math-only option and lots of the wrapper functions have been optimized.
80 lines
2.1 KiB
C
80 lines
2.1 KiB
C
/* Copyright (C) 2011 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@gmail.com>, 2011.
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The GNU C Library 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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The GNU C Library 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 GNU
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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 the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <math.h>
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#include <math_private.h>
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/* wrapper pow */
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double
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__pow (double x, double y)
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{
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double z = __ieee754_pow (x, y);
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if (__builtin_expect (!__finite (z), 0))
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{
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if (_LIB_VERSION != _IEEE_)
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{
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if (__isnan (x))
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{
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if (y == 0.0)
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/* pow(NaN,0.0) */
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return __kernel_standard (x, y, 42);
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}
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else if (__finite (x) && __finite (y))
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{
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if (__isnan (z))
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/* pow neg**non-int */
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return __kernel_standard (x, y, 24);
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else if (x == 0.0 && y < 0.0)
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{
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if (signbit (x) && signbit (z))
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/* pow(-0.0,negative) */
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return __kernel_standard (x, y, 23);
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else
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/* pow(+0.0,negative) */
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return __kernel_standard (x, y, 43);
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}
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else
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/* pow overflow */
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return __kernel_standard (x, y, 21);
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}
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}
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}
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else if (__builtin_expect (z == 0.0, 0) && __finite (x) && __finite (y)
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&& _LIB_VERSION != _IEEE_)
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{
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if (x == 0.0)
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{
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if (y == 0.0)
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/* pow(0.0,0.0) */
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return __kernel_standard (x, y, 20);
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}
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else
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/* pow underflow */
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return __kernel_standard (x, y, 22);
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}
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return z;
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}
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weak_alias (__pow, pow)
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#ifdef NO_LONG_DOUBLE
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strong_alias (__pow, __powl)
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weak_alias (__pow, powl)
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#endif
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