1 
   2 /*
   3  * Copyright (c) 1998, 2001, Oracle and/or its affiliates. All rights reserved.
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This code is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License version 2 only, as
   8  * published by the Free Software Foundation.  Oracle designates this
   9  * particular file as subject to the "Classpath" exception as provided
  10  * by Oracle in the LICENSE file that accompanied this code.
  11  *
  12  * This code is distributed in the hope that it will be useful, but WITHOUT
  13  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15  * version 2 for more details (a copy is included in the LICENSE file that
  16  * accompanied this code).
  17  *
  18  * You should have received a copy of the GNU General Public License version
  19  * 2 along with this work; if not, write to the Free Software Foundation,
  20  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  21  *
  22  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  23  * or visit www.oracle.com if you need additional information or have any
  24  * questions.
  25  */
  26 
  27 /*
  28  * wrapper acosh(x)
  29  */
  30 
  31 #include "fdlibm.h"
  32 
  33 #ifdef __STDC__
  34         double acosh(double x)          /* wrapper acosh */
  35 #else
  36         double acosh(x)                 /* wrapper acosh */
  37         double x;
  38 #endif
  39 {
  40 #ifdef _IEEE_LIBM
  41         return __ieee754_acosh(x);
  42 #else
  43         double z;
  44         z = __ieee754_acosh(x);
  45         if(_LIB_VERSION == _IEEE_ || isnan(x)) return z;
  46         if(x<1.0) {
  47                 return __kernel_standard(x,x,29); /* acosh(x<1) */
  48         } else
  49             return z;
  50 #endif
  51 }