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 atan2f(y,x)
21 */
22
23
24 #include <math.h>
25 #include "math_private.h"
26 #if defined(__UCLIBC_HAS_FENV__)
27 #include <errno.h>
28 #endif
29
30 float
atan2f(float y,float x)31 atan2f (float y, float x)
32 {
33 #if defined(__UCLIBC_HAS_FENV__)
34 float z;
35
36 if (__builtin_expect (x == 0.0f && y == 0.0f, 0) && _LIB_VERSION == _SVID_)
37 return __kernel_standard_f (y, x, 103); /* atan2(+-0,+-0) */
38
39 z = (float) __ieee754_atan2 ((double) y, (double) x);
40 if (__builtin_expect (z == 0.0f && y != 0.0f && isfinite (x), 0))
41 __set_errno (ERANGE);
42 return z;
43 #else
44 return (float) __ieee754_atan2 ((double) y, (double) x);
45 #endif
46 }
47