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1 | /* Wrapper to set errno for exp. |
2 | Copyright (C) 2017 Free Software Foundation, Inc. | |
3 | This file is part of the GNU C Library. | |
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 | /* Only build wrappers from the templates for the types that define the macro | |
20 | below. This macro is set in math-type-macros-<type>.h in sysdeps/generic | |
21 | for each floating-point type. */ | |
22 | #if __USE_WRAPPER_TEMPLATE | |
23 | ||
24 | # include <fenv.h> | |
25 | # include <math.h> | |
26 | # include <math_private.h> | |
27 | ||
28 | /* Provide an additional macro expansion for hidden_def. */ | |
29 | #define hidden_def_x(name) hidden_def (name) | |
30 | ||
31 | FLOAT | |
32 | M_DECL_FUNC (__exp) (FLOAT x) | |
33 | { | |
34 | FLOAT z = M_SUF (__ieee754_exp) (x); | |
35 | if (__glibc_unlikely (!isfinite (z) || z == 0) && isfinite (x)) | |
36 | /* Overflow or underflow. */ | |
37 | __set_errno (ERANGE); | |
38 | return z; | |
39 | } | |
40 | hidden_def_x (M_SUF (__exp)) | |
41 | declare_mgen_alias (__exp, exp) | |
42 | ||
43 | #endif /* __USE_WRAPPER_TEMPLATE. */ |