1*2fe8fb19SBen Gras /* @(#)w_atan2.c 5.1 93/09/24 */
2*2fe8fb19SBen Gras /*
3*2fe8fb19SBen Gras * ====================================================
4*2fe8fb19SBen Gras * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
5*2fe8fb19SBen Gras *
6*2fe8fb19SBen Gras * Developed at SunPro, a Sun Microsystems, Inc. business.
7*2fe8fb19SBen Gras * Permission to use, copy, modify, and distribute this
8*2fe8fb19SBen Gras * software is freely granted, provided that this notice
9*2fe8fb19SBen Gras * is preserved.
10*2fe8fb19SBen Gras * ====================================================
11*2fe8fb19SBen Gras */
12*2fe8fb19SBen Gras
13*2fe8fb19SBen Gras #include <sys/cdefs.h>
14*2fe8fb19SBen Gras #if defined(LIBM_SCCS) && !defined(lint)
15*2fe8fb19SBen Gras __RCSID("$NetBSD: w_atan2.c,v 1.10 2007/08/10 21:20:36 drochner Exp $");
16*2fe8fb19SBen Gras #endif
17*2fe8fb19SBen Gras
18*2fe8fb19SBen Gras /*
19*2fe8fb19SBen Gras * wrapper atan2(y,x)
20*2fe8fb19SBen Gras */
21*2fe8fb19SBen Gras
22*2fe8fb19SBen Gras #include "namespace.h"
23*2fe8fb19SBen Gras #include "math.h"
24*2fe8fb19SBen Gras #include "math_private.h"
25*2fe8fb19SBen Gras
26*2fe8fb19SBen Gras #ifdef __weak_alias
__weak_alias(atan2,_atan2)27*2fe8fb19SBen Gras __weak_alias(atan2, _atan2)
28*2fe8fb19SBen Gras #endif
29*2fe8fb19SBen Gras
30*2fe8fb19SBen Gras double
31*2fe8fb19SBen Gras atan2(double y, double x) /* wrapper atan2 */
32*2fe8fb19SBen Gras {
33*2fe8fb19SBen Gras #ifdef _IEEE_LIBM
34*2fe8fb19SBen Gras return __ieee754_atan2(y,x);
35*2fe8fb19SBen Gras #else
36*2fe8fb19SBen Gras double z;
37*2fe8fb19SBen Gras z = __ieee754_atan2(y,x);
38*2fe8fb19SBen Gras if(_LIB_VERSION == _IEEE_||isnan(x)||isnan(y)) return z;
39*2fe8fb19SBen Gras if(x==0.0&&y==0.0) {
40*2fe8fb19SBen Gras return __kernel_standard(y,x,3); /* atan2(+-0,+-0) */
41*2fe8fb19SBen Gras } else
42*2fe8fb19SBen Gras return z;
43*2fe8fb19SBen Gras #endif
44*2fe8fb19SBen Gras }
45