text: /*
   This Software is provided under the Zope Public License (ZPL) Version 2.1.
  
   Copyright (c) 2009, 2010 by the mingw-w64 project
  
   See the AUTHORS file for the list of contributors to the mingw-w64 project.
  
   This license has been certified as open source. It has also been designated
   as GPL compatible by the Free Software Foundation (FSF).
  
   Redistribution and use in source and binary forms, with or without
   modification, are permitted provided that the following conditions are met:
  
     1. Redistributions in source code must retain the accompanying copyright
        notice, this list of conditions, and the following disclaimer.
     2. Redistributions in binary form must reproduce the accompanying
        copyright notice, this list of conditions, and the following disclaimer
        in the documentation and/or other materials provided with the
        distribution.
     3. Names of the copyright holders must not be used to endorse or promote
        products derived from this software without prior written permission
        from the copyright holders.
     4. The right to distribute this software or to use it for any purpose does
        not give you the right to use Servicemarks (sm) or Trademarks (tm) of
        the copyright holders.  Use of them is covered by separate agreement
        with the copyright holders.
     5. If any files are modified, you must cause the modified files to carry
        prominent notices stating that you changed the files and the date of
        any change.
  
   Disclaimer
  
   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY EXPRESSED
   OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
   EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY DIRECT, INDIRECT,
   INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
   OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
   LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
   EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
  
  #include "complex_internal.h"
  #include <errno.h>
  #include "fastmath.h"
  
  __FLT_TYPE
  __FLT_ABI(acosh) (__FLT_TYPE x)
  {
    int x_class = fpclassify (x);
    if (x_class == FP_NAN)
      {
        errno = EDOM;
        return x;
      }
    else if (x < __FLT_CST(1.0))
      {
        errno = EDOM;
        return __FLT_NAN;
      }
    else if (x_class == FP_INFINITE)
      {
        errno = EDOM;
        return __FLT_NAN;
      }
  
    if (x > __FLT_CST(0x1p32))
      return __FLT_ABI (__fast_log) (x) + 6.9314718055994530941723E-1L;
  
    return __FLT_ABI (__fast_log) (x +
     __FLT_ABI (__fast_sqrt) ((x + __FLT_CST(1.0)) * (x - __FLT_CST(1.0))));
  }
  
  