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 /* wrapper exp */ 20 21 #include <math.h> 22 #include "math_private.h" 23 24 double exp(double x)25exp (double x) 26 { 27 #if defined(__UCLIBC_HAS_FENV__) 28 double z = __ieee754_exp (x); 29 if (__builtin_expect (!isfinite (z) || z == 0, 0) 30 && isfinite (x) && _LIB_VERSION != _IEEE_) 31 return __kernel_standard (x, x, 6 + !!signbit (x)); 32 33 return z; 34 #else 35 return __ieee754_exp (x); 36 #endif 37 } 38 libm_hidden_def(exp) 39