| 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 <fenv.h> |
| 20 | #include <math.h> |
| 21 | #include <math_private.h> |
| 22 | |
| 23 | |
| 24 | static long double |
| 25 | __attribute__ ((noinline)) |
| 26 | invalid_fn (long double x, long double fn) |
| 27 | { |
| 28 | if (__rintl (fn) != fn) |
| 29 | { |
| 30 | feraiseexcept (FE_INVALID); |
| 31 | return __nan (""); |
| 32 | } |
| 33 | else if (fn > 65000.0L) |
| 34 | return __scalbnl (x, 65000); |
| 35 | else |
| 36 | return __scalbnl (x,-65000); |
| 37 | } |
| 38 | |
| 39 | |
| 40 | long double |
| 41 | __ieee754_scalbl (long double x, long double fn) |
| 42 | { |
| 43 | if (__glibc_unlikely (isnan (x))) |
| 44 | return x * fn; |
| 45 | if (__glibc_unlikely (!isfinite (fn))) |
| 46 | { |
| 47 | if (isnan (fn) || fn > 0.0L) |
| 48 | return x * fn; |
| 49 | if (x == 0.0L) |
| 50 | return x; |
| 51 | return x / -fn; |
| 52 | } |
| 53 | if (__glibc_unlikely (fabsl (fn) >= 0x1p31L || (long double) (int) fn != fn)) |
| 54 | return invalid_fn (x, fn); |
| 55 | |
| 56 | return __scalbnl (x, (int) fn); |
| 57 | } |
| 58 | strong_alias (__ieee754_scalbl, __scalbl_finite) |