| xf.li | bdd93d5 | 2023-05-12 07:10:14 -0700 | [diff] [blame^] | 1 | /* Copyright (C) 2011-2016 Free Software Foundation, Inc. |
| 2 | This file is part of the GNU C Library. |
| 3 | Contributed by Ulrich Drepper <drepper@gmail.com>, 2011. |
| 4 | |
| 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. |
| 9 | |
| 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. |
| 14 | |
| 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/>. */ |
| 18 | |
| 19 | #include <math.h> |
| 20 | #include <math_private.h> |
| 21 | |
| 22 | |
| 23 | /* wrapper powf */ |
| 24 | float |
| 25 | __powf (float x, float y) |
| 26 | { |
| 27 | float z = __ieee754_powf (x, y); |
| 28 | if (__glibc_unlikely (!isfinite (z))) |
| 29 | { |
| 30 | if (_LIB_VERSION != _IEEE_) |
| 31 | { |
| 32 | if (isnan (x)) |
| 33 | { |
| 34 | if (y == 0.0f) |
| 35 | /* pow(NaN,0.0) */ |
| 36 | return __kernel_standard_f (x, y, 142); |
| 37 | } |
| 38 | else if (isfinite (x) && isfinite (y)) |
| 39 | { |
| 40 | if (isnan (z)) |
| 41 | /* pow neg**non-int */ |
| 42 | return __kernel_standard_f (x, y, 124); |
| 43 | else if (x == 0.0f && y < 0.0f) |
| 44 | { |
| 45 | if (signbit (x) && signbit (z)) |
| 46 | /* pow(-0.0,negative) */ |
| 47 | return __kernel_standard_f (x, y, 123); |
| 48 | else |
| 49 | /* pow(+0.0,negative) */ |
| 50 | return __kernel_standard_f (x, y, 143); |
| 51 | } |
| 52 | else |
| 53 | /* pow overflow */ |
| 54 | return __kernel_standard_f (x, y, 121); |
| 55 | } |
| 56 | } |
| 57 | } |
| 58 | else if (__builtin_expect (z == 0.0f, 0) && isfinite (x) && isfinite (y) |
| 59 | && _LIB_VERSION != _IEEE_) |
| 60 | { |
| 61 | if (x == 0.0f) |
| 62 | { |
| 63 | if (y == 0.0f) |
| 64 | /* pow(0.0,0.0) */ |
| 65 | return __kernel_standard_f (x, y, 120); |
| 66 | } |
| 67 | else |
| 68 | /* pow underflow */ |
| 69 | return __kernel_standard_f (x, y, 122); |
| 70 | } |
| 71 | |
| 72 | return z; |
| 73 | } |
| 74 | weak_alias (__powf, powf) |