1 /* Copyright (C) 2011-2020 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@gmail.com>, 2011.
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.
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.
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 <https://www.gnu.org/licenses/>. */
20 #include <math_private.h>
21 #include <math-svid-compat.h>
22 #include <libm-alias-double.h>
24 #if LIBM_SVID_COMPAT && (SHLIB_COMPAT (libm, GLIBC_2_0, GLIBC_2_29) \
25 || defined NO_LONG_DOUBLE \
26 || defined LONG_DOUBLE_COMPAT)
29 __exp_compat (double x
)
31 double z
= __ieee754_exp (x
);
32 if (__builtin_expect (!isfinite (z
) || z
== 0, 0)
33 && isfinite (x
) && _LIB_VERSION
!= _IEEE_
)
34 return __kernel_standard (x
, x
, 6 + !!signbit (x
));
38 # if SHLIB_COMPAT (libm, GLIBC_2_0, GLIBC_2_29)
39 compat_symbol (libm
, __exp_compat
, exp
, GLIBC_2_0
);
41 # ifdef NO_LONG_DOUBLE
42 weak_alias (__exp_compat
, expl
)
44 # ifdef LONG_DOUBLE_COMPAT
45 /* Work around gas bug "multiple versions for symbol". */
46 weak_alias (__exp_compat
, __exp_compat_alias
)
48 LONG_DOUBLE_COMPAT_CHOOSE_libm_expl (
49 compat_symbol (libm
, __exp_compat_alias
, expl
, FIRST_VERSION_libm_expl
), );