1
2/* @(#)w_atanh.c 1.3 95/01/18 */
3/*
4 * ====================================================
5 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
6 *
7 * Developed at SunSoft, 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 * wrapper atanh(x)
15 */
16
17#include "fdlibm.h"
18
19
20#ifdef __STDC__
21	double atanh(double x)		/* wrapper atanh */
22#else
23	double atanh(x)			/* wrapper atanh */
24	double x;
25#endif
26{
27#ifdef _IEEE_LIBM
28	return __ieee754_atanh(x);
29#else
30	double z,y;
31	z = __ieee754_atanh(x);
32	if(_LIB_VERSION == _IEEE_ || ieee_isnan(x)) return z;
33	y = ieee_fabs(x);
34	if(y>=1.0) {
35	    if(y>1.0)
36	        return __kernel_standard(x,x,30); /* atanh(|x|>1) */
37	    else
38	        return __kernel_standard(x,x,31); /* atanh(|x|==1) */
39	} else
40	    return z;
41#endif
42}
43