1 /* Copyright (C) 2011-2014 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@gmail.com>, 2011.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <http://www.gnu.org/licenses/>. */
20 #include <math_private.h>
25 __pow (double x, double y)
27 double z = __ieee754_pow (x, y);
28 if (__glibc_unlikely (!__finite (z)))
30 if (_LIB_VERSION != _IEEE_)
36 return __kernel_standard (x, y, 42);
38 else if (__finite (x) && __finite (y))
41 /* pow neg**non-int */
42 return __kernel_standard (x, y, 24);
43 else if (x == 0.0 && y < 0.0)
45 if (signbit (x) && signbit (z))
46 /* pow(-0.0,negative) */
47 return __kernel_standard (x, y, 23);
49 /* pow(+0.0,negative) */
50 return __kernel_standard (x, y, 43);
54 return __kernel_standard (x, y, 21);
58 else if (__builtin_expect (z == 0.0, 0) && __finite (x) && __finite (y)
59 && _LIB_VERSION != _IEEE_)
65 return __kernel_standard (x, y, 20);
69 return __kernel_standard (x, y, 22);
74 weak_alias (__pow, pow)
76 strong_alias (__pow, __powl)
77 weak_alias (__pow, powl)