/* Copyright (C) 2011-2015 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Ulrich Drepper <drepper@gmail.com>, 2011. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, see <http://www.gnu.org/licenses/>. */ #include <math.h> #include <math_private.h> /* wrapper pow */ double __pow (double x, double y) { double z = __ieee754_pow (x, y); if (__glibc_unlikely (!isfinite (z))) { if (_LIB_VERSION != _IEEE_) { if (isnan (x)) { if (y == 0.0) /* pow(NaN,0.0) */ return __kernel_standard (x, y, 42); } else if (isfinite (x) && isfinite (y)) { if (isnan (z)) /* pow neg**non-int */ return __kernel_standard (x, y, 24); else if (x == 0.0 && y < 0.0) { if (signbit (x) && signbit (z)) /* pow(-0.0,negative) */ return __kernel_standard (x, y, 23); else /* pow(+0.0,negative) */ return __kernel_standard (x, y, 43); } else /* pow overflow */ return __kernel_standard (x, y, 21); } } } else if (__builtin_expect (z == 0.0, 0) && isfinite (x) && isfinite (y) && _LIB_VERSION != _IEEE_) { if (x == 0.0) { if (y == 0.0) /* pow(0.0,0.0) */ return __kernel_standard (x, y, 20); } else /* pow underflow */ return __kernel_standard (x, y, 22); } return z; } weak_alias (__pow, pow) #ifdef NO_LONG_DOUBLE strong_alias (__pow, __powl) weak_alias (__pow, powl) #endif