| /* Copyright (C) 2011-2014 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 <fenv.h> |
| #include <math.h> |
| #include <math_private.h> |
| |
| |
| static double |
| __attribute__ ((noinline)) |
| invalid_fn (double x, double fn) |
| { |
| if (__rint (fn) != fn) |
| { |
| feraiseexcept (FE_INVALID); |
| return __nan (""); |
| } |
| else if (fn > 65000.0) |
| return __scalbn (x, 65000); |
| else |
| return __scalbn (x,-65000); |
| } |
| |
| |
| double |
| __ieee754_scalb (double x, double fn) |
| { |
| if (__builtin_expect (__isnan (x), 0)) |
| return x * fn; |
| if (__builtin_expect (!__finite (fn), 0)) |
| { |
| if (__isnan (fn) || fn > 0.0) |
| return x * fn; |
| if (x == 0.0) |
| return x; |
| return x / -fn; |
| } |
| if (__builtin_expect ((double) (int) fn != fn, 0)) |
| return invalid_fn (x, fn); |
| |
| return __scalbn (x, (int) fn); |
| } |
| strong_alias (__ieee754_scalb, __scalb_finite) |
