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/*
* 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 2006 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "@(#)cacoshl.c 1.5 06/01/31 SMI"
#pragma weak cacoshl = __cacoshl
#include "libm.h" /* fabsl/isnanl/isinfl/signbitl */
#include "complex_wrapper.h"
/* INDENT OFF */
/*
* ldcomplex cacoshl(ldcomplex z);
* cacosh z = +-i cacos z .
* In order to make conj(cacosh(z))=cacosh(conj(z)),
* we define
* cacosh z = sign(Im(z))*i cacos z .
*
*/
/* INDENT ON */
ldcomplex
cacoshl(ldcomplex z) {
ldcomplex w, ans;
long double x, y;
w = cacosl(z);
x = LD_RE(z);
y = LD_IM(z);
if (isnanl(y)) {
LD_IM(ans) = y + y;
if (isinfl(x))
LD_RE(ans) = fabsl(x);
else
LD_RE(ans) = y;
} else if (signbitl(y) == 0) {
LD_RE(ans) = -LD_IM(w);
LD_IM(ans) = LD_RE(w);
} else {
LD_RE(ans) = LD_IM(w);
LD_IM(ans) = -LD_RE(w);
}
return (ans);
}
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