Home | History | Annotate | Line # | Download | only in src 
      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