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 #if defined(__UCLIBC_HAS_FENV__) 22 #include <fenv.h> 23 #endif 24 25 /* wrapper acos */ 26 double acos(double x)27acos (double x) 28 { 29 #if defined(__UCLIBC_HAS_FENV__) 30 if (__builtin_expect (isgreater (fabs (x), 1.0), 0) 31 && _LIB_VERSION != _IEEE_) 32 { 33 /* acos(|x|>1) */ 34 feraiseexcept (FE_INVALID); 35 return __kernel_standard (x, x, 1); 36 } 37 #endif 38 return __ieee754_acos (x); 39 } 40 libm_hidden_def(acos) 41