1/* Copyright (C) 2011-2024 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <https://www.gnu.org/licenses/>. */
17
18/*
19 * wrapper atan2f(y,x)
20 */
21
22#include <errno.h>
23#include <math.h>
24#include <math_private.h>
25#include <math-svid-compat.h>
26#include <libm-alias-float.h>
27
28
29#if LIBM_SVID_COMPAT
30float
31__atan2f (float y, float x)
32{
33 float z;
34
35 if (__builtin_expect (x == 0.0f && y == 0.0f, 0) && _LIB_VERSION == _SVID_)
36 return __kernel_standard_f (y, x, 103); /* atan2(+-0,+-0) */
37
38 z = __ieee754_atan2f (y, x);
39 if (__glibc_unlikely (z == 0.0f && y != 0.0f && isfinite (x)))
40 __set_errno (ERANGE);
41 return z;
42}
43libm_alias_float (__atan2, atan2)
44#endif
45

source code of glibc/math/w_atan2f_compat.c