source: trunk/sys/libm/w_atan2.c @ 1

Last change on this file since 1 was 1, checked in by alain, 5 years ago

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1
2/* @(#)w_atan2.c 5.1 93/09/24 */
3/*
4 * ====================================================
5 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
6 *
7 * Developed at SunPro, a Sun Microsystems, Inc. business.
8 * Permission to use, copy, modify, and distribute this
9 * software is freely granted, provided that this notice
10 * is preserved.
11 * ====================================================
12 *
13 */
14
15/*
16 * wrapper atan2(y,x)
17 */
18
19#include <libm/fdlibm.h>
20
21
22#ifdef __STDC__
23        double atan2(double y, double x)        /* wrapper atan2 */
24#else
25        double atan2(y,x)                       /* wrapper atan2 */
26        double y,x;
27#endif
28{
29#ifdef _IEEE_LIBM
30        return __ieee754_atan2(y,x);
31#else
32        double z;
33        z = __ieee754_atan2(y,x);
34        if(_LIB_VERSION == _IEEE_||isnan(x)||isnan(y)) return z;
35        if(x==0.0&&y==0.0) {
36                return __kernel_standard(y,x,3); /* atan2(+-0,+-0) */
37        } else
38            return z;
39#endif
40}
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