xref: /netbsd/lib/libm/src/w_atanh.c (revision bf9ec67e)
1 /* @(#)w_atanh.c 5.1 93/09/24 */
2 /*
3  * ====================================================
4  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
5  *
6  * Developed at SunPro, a Sun Microsystems, Inc. business.
7  * Permission to use, copy, modify, and distribute this
8  * software is freely granted, provided that this notice
9  * is preserved.
10  * ====================================================
11  */
12 
13 #include <sys/cdefs.h>
14 #if defined(LIBM_SCCS) && !defined(lint)
15 __RCSID("$NetBSD: w_atanh.c,v 1.9 2002/05/26 22:02:00 wiz Exp $");
16 #endif
17 
18 /*
19  * wrapper atanh(x)
20  */
21 
22 #include "math.h"
23 #include "math_private.h"
24 
25 
26 double
27 atanh(double x)		/* wrapper atanh */
28 {
29 #ifdef _IEEE_LIBM
30 	return __ieee754_atanh(x);
31 #else
32 	double z,y;
33 	z = __ieee754_atanh(x);
34 	if(_LIB_VERSION == _IEEE_ || isnan(x)) return z;
35 	y = fabs(x);
36 	if(y>=1.0) {
37 	    if(y>1.0)
38 	        return __kernel_standard(x,x,30); /* atanh(|x|>1) */
39 	    else
40 	        return __kernel_standard(x,x,31); /* atanh(|x|==1) */
41 	} else
42 	    return z;
43 #endif
44 }
45