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.
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 <https://www.gnu.org/licenses/>. */
18
19/*
20 * wrapper atan2(y,x)
21 */
22
23#include <errno.h>
24#include <math.h>
25#include <math_private.h>
26#include <math-svid-compat.h>
27#include <libm-alias-double.h>
28
29
30#if LIBM_SVID_COMPAT
31double
32__atan2 (double y, double x)
33{
34 double z;
35
36 if (__builtin_expect (x == 0.0 && y == 0.0, 0) && _LIB_VERSION == _SVID_)
37 return __kernel_standard (y, x, 3); /* atan2(+-0,+-0) */
38
39 z = __ieee754_atan2 (y, x);
40 if (__glibc_unlikely (z == 0.0 && y != 0.0 && isfinite (x)))
41 __set_errno (ERANGE);
42 return z;
43}
44libm_alias_double (__atan2, atan2)
45#endif
46