| /* Copyright (C) 2011-2018 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> |
| #include <math-svid-compat.h> |
| #include <libm-alias-double.h> |
| |
| |
| #if LIBM_SVID_COMPAT |
| /* wrapper pow */ |
| double |
| __pow (double x, double y) |
| { |
| double z = __ieee754_pow (x, y); |
| if (__glibc_unlikely (!isfinite (z))) |
| { |
| if (_LIB_VERSION != _IEEE_) |
| { |
| 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) && x != 0 && isfinite (y) |
| && _LIB_VERSION != _IEEE_) |
| /* pow underflow */ |
| return __kernel_standard (x, y, 22); |
| |
| return z; |
| } |
| libm_alias_double (__pow, pow) |
| #endif |
