/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright 2011 Nexenta Systems, Inc.  All rights reserved.
 */
/*
 * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#pragma weak __asinhl = asinhl

#include "libm.h"

static const long double
        ln2     = 6.931471805599453094172321214581765680755e-0001L,
        one     = 1.0L,
        big     = 1.0e+20L,
        tiny    = 1.0e-20L;

long double
asinhl(long double x) {
        long double t, w;
#ifndef lint
        volatile long double dummy;
#endif

        w = fabsl(x);
        if (isnanl(x))
                return (x + x); /* x is NaN */
        if (w < tiny) {
#ifndef lint
                dummy = x + big;        /* inexact if x != 0 */
#endif
                return (x);     /* tiny x */
        } else if (w < big) {
                t = one / w;
                return (copysignl(log1pl(w + w / (t + sqrtl(one + t * t))), x));
        } else
                return (copysignl(logl(w) + ln2, x));
}