| xf.li | bdd93d5 | 2023-05-12 07:10:14 -0700 | [diff] [blame] | 1 | /* Copyright (C) 2012-2016 Free Software Foundation, Inc. |
| 2 | This file is part of the GNU C Library. |
| 3 | Contributed by Adhemerval Zanella <azanella@linux.vnet.ibm.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 <errno.h> |
| 21 | #include <limits.h> |
| 22 | #include <math_private.h> |
| 23 | |
| 24 | /* wrapper ilogb */ |
| 25 | int |
| 26 | __ilogb (double x) |
| 27 | { |
| 28 | int r = __ieee754_ilogb (x); |
| 29 | if (__builtin_expect (r == FP_ILOGB0, 0) |
| 30 | || __builtin_expect (r == FP_ILOGBNAN, 0) |
| 31 | || __builtin_expect (r == INT_MAX, 0)) |
| 32 | { |
| 33 | __set_errno (EDOM); |
| 34 | __feraiseexcept (FE_INVALID); |
| 35 | } |
| 36 | return r; |
| 37 | } |
| 38 | weak_alias (__ilogb, ilogb) |
| 39 | #ifdef NO_LONG_DOUBLE |
| 40 | strong_alias (__ilogb, __ilogbl) |
| 41 | weak_alias (__ilogb, ilogbl) |
| 42 | #endif |