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 <errno.h>
23 #endif
24
25 #if !defined __NO_LONG_DOUBLE_MATH
26 /* wrapper atan2l(y,x) */
27 long double
atan2l(long double y,long double x)28 atan2l (long double y, long double x)
29 {
30 # if defined(__UCLIBC_HAS_FENV__)
31 long double z;
32
33 if (__builtin_expect (x == 0.0L && y == 0.0L, 0) && _LIB_VERSION == _SVID_)
34 return __kernel_standard_l (y, x, 203); /* atan2(+-0,+-0) */
35
36 z = (long double) __ieee754_atan2 ((double)y,(double) x);
37 if (__builtin_expect (z == 0.0L && y != 0.0L && isfinite (x),0))
38 __set_errno (ERANGE);
39 return z;
40 # else
41 return (long double) __ieee754_atan2 ((double)y,(double) x);
42 # endif /* __UCLIBC_HAS_FENV__ */
43 }
44 #endif /* __NO_LONG_DOUBLE_MATH */
45