summaryrefslogtreecommitdiffstats
path: root/lib/msun/src/w_atan2.c
blob: 1d4055d896be0fd69d5fa2cffd61326d81254ed9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
/* @(#)w_atan2.c 5.1 93/09/24 */
/*
 * ====================================================
 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
 *
 * Developed at SunPro, a Sun Microsystems, Inc. business.
 * Permission to use, copy, modify, and distribute this
 * software is freely granted, provided that this notice 
 * is preserved.
 * ====================================================
 */

#ifndef lint
static char rcsid[] = "$Id: w_atan2.c,v 1.4 1994/08/10 20:33:38 jtc Exp $";
#endif

/* 
 * wrapper atan2(y,x)
 */

#include "math.h"
#include "math_private.h"


#ifdef __STDC__
	double atan2(double y, double x)	/* wrapper atan2 */
#else
	double atan2(y,x)			/* wrapper atan2 */
	double y,x;
#endif
{
#ifdef _IEEE_LIBM
	return __ieee754_atan2(y,x);
#else
	double z;
	z = __ieee754_atan2(y,x);
	if(_LIB_VERSION == _IEEE_||isnan(x)||isnan(y)) return z;
	if(x==0.0&&y==0.0) {
	        return __kernel_standard(y,x,3); /* atan2(+-0,+-0) */
	} else
	    return z;
#endif
}
OpenPOWER on IntegriCloud