diff options
Diffstat (limited to 'libm/w_exp.c')
-rw-r--r-- | libm/w_exp.c | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/libm/w_exp.c b/libm/w_exp.c new file mode 100644 index 000000000..bc65c3930 --- /dev/null +++ b/libm/w_exp.c @@ -0,0 +1,38 @@ +/* Copyright (C) 2011-2016 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/>. */ + +/* wrapper exp */ + +#include <math.h> +#include "math_private.h" + +double +exp (double x) +{ +#if __UCLIBC_HAS_FENV__ + double z = __ieee754_exp (x); + if (__builtin_expect (!isfinite (z) || z == 0, 0) + && isfinite (x) && _LIB_VERSION != _IEEE_) + return __kernel_standard (x, x, 6 + !!signbit (x)); + + return z; +#else + return __ieee754_exp (x); +#endif +} +libm_hidden_def(exp) |