1/* @(#)w_acosh.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_acosh.c,v 1.8 1999/07/02 15:37:43 simonb Exp $");
16#endif
17
18/*
19 * wrapper acosh(x)
20 */
21
22#include "math.h"
23#include "math_private.h"
24
25double
26acosh(double x)		/* wrapper acosh */
27{
28#ifdef _IEEE_LIBM
29	return __ieee754_acosh(x);
30#else
31	double z;
32	z = __ieee754_acosh(x);
33	if(_LIB_VERSION == _IEEE_ || isnan(x)) return z;
34	if(x<1.0) {
35	        return __kernel_standard(x,x,29); /* acosh(x<1) */
36	} else
37	    return z;
38#endif
39}
40