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 /*
20 * wrapper atan2(y,x)
21 */
22
23 #include <math.h>
24 #include "math_private.h"
25 #if defined(__UCLIBC_HAS_FENV__)
26 #include <errno.h>
27 #endif
28
29 double
atan2(double y,double x)30 atan2 (double y, double x)
31 {
32 #if defined(__UCLIBC_HAS_FENV__)
33 double z;
34
35 if (__builtin_expect (x == 0.0 && y == 0.0, 0) && _LIB_VERSION == _SVID_)
36 return __kernel_standard (y, x, 3); /* atan2(+-0,+-0) */
37
38 z = __ieee754_atan2 (y, x);
39 if (__builtin_expect (z == 0.0 && y != 0.0 && isfinite (x),0))
40 __set_errno (ERANGE);
41 return z;
42 #else
43 return __ieee754_atan2 (y, x);
44 #endif
45 }
46 libm_hidden_def(atan2)
47