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[glibc/history.git] / math / w_atanh.c
blobb81f65c311f259492ba7cc5874b87bea69abcf32
1 /* @(#)w_atanh.c 5.1 93/09/24 */
2 /*
3 * ====================================================
4 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
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 * ====================================================
13 #if defined(LIBM_SCCS) && !defined(lint)
14 static char rcsid[] = "$NetBSD: w_atanh.c,v 1.6 1995/05/10 20:48:43 jtc Exp $";
15 #endif
18 * wrapper atanh(x)
21 #include <math.h>
22 #include "math_private.h"
25 #ifdef __STDC__
26 double __atanh(double x) /* wrapper atanh */
27 #else
28 double __atanh(x) /* wrapper atanh */
29 double x;
30 #endif
32 #ifdef _IEEE_LIBM
33 return __ieee754_atanh(x);
34 #else
35 double z,y;
36 z = __ieee754_atanh(x);
37 if(_LIB_VERSION == _IEEE_ || __isnan(x)) return z;
38 y = fabs(x);
39 if(y>=1.0) {
40 if(y>1.0)
41 return __kernel_standard(x,x,30); /* atanh(|x|>1) */
42 else
43 return __kernel_standard(x,x,31); /* atanh(|x|==1) */
44 } else
45 return z;
46 #endif
48 weak_alias (__atanh, atanh)
49 #ifdef NO_LONG_DOUBLE
50 strong_alias (__atanh, __atanhl)
51 weak_alias (__atanh, atanhl)
52 #endif