1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 
  22 /*
  23  * Copyright 2011 Nexenta Systems, Inc.  All rights reserved.
  24  */
  25 
  26 /*
  27  * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
  28  * Use is subject to license terms.
  29  */
  30 
  31 #pragma weak __cacoshl = cacoshl
  32 
  33 #include "libm.h"                       /* fabsl/isnanl/isinfl/signbitl */
  34 #include "complex_wrapper.h"
  35 #include "longdouble.h"
  36 
  37 
  38 /*
  39  * ldcomplex cacoshl(ldcomplex z);
  40  *      cacosh z = +-i cacos z .
  41  * In order to make conj(cacosh(z))=cacosh(conj(z)),
  42  * we define
  43  *      cacosh z = sign(Im(z))*i cacos z .
  44  *
  45  */
  46 
  47 ldcomplex
  48 cacoshl(ldcomplex z)
  49 {
  50         ldcomplex w, ans;
  51         long double x, y;
  52 
  53         w = cacosl(z);
  54         x = LD_RE(z);
  55         y = LD_IM(z);
  56 
  57         if (isnanl(y)) {
  58                 LD_IM(ans) = y + y;
  59 
  60                 if (isinfl(x))
  61                         LD_RE(ans) = fabsl(x);
  62                 else
  63                         LD_RE(ans) = y;
  64         } else if (signbitl(y) == 0) {
  65                 LD_RE(ans) = -LD_IM(w);
  66                 LD_IM(ans) = LD_RE(w);
  67         } else {
  68                 LD_RE(ans) = LD_IM(w);
  69                 LD_IM(ans) = -LD_RE(w);
  70         }
  71 
  72         return (ans);
  73 }