Subversion Repositories openrisc_me

/* Complex cosine hyperbole function for double.

   Copyright (C) 1997 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, write to the Free

   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA

   02111-1307 USA.  */

#include <complex.h>

#include <fenv.h>

#include <math.h>

#include "math_private.h"

__complex__ double

__ccosh (__complex__ double x)

{

  __complex__ double retval;

  int rcls = fpclassify (__real__ x);

  int icls = fpclassify (__imag__ x);

  if (rcls >= FP_ZERO)

    {

      /* Real part is finite.  */

      if (icls >= FP_ZERO)

        {

          /* Imaginary part is finite.  */

          double sinh_val = __ieee754_sinh (__real__ x);

          double cosh_val = __ieee754_cosh (__real__ x);

          double sinix, cosix;

          __sincos (__imag__ x, &sinix, &cosix);

          __real__ retval = cosh_val * cosix;

          __imag__ retval = sinh_val * sinix;

        }

      else

        {

          __imag__ retval = __real__ x == 0.0 ? 0.0 : __nan ("");

          __real__ retval = __nan ("") + __nan ("");

#ifdef FE_INVALID

          if (icls == FP_INFINITE)

            feraiseexcept (FE_INVALID);

#endif

        }

    }

  else if (rcls == FP_INFINITE)

    {

      /* Real part is infinite.  */

      if (icls == FP_ZERO)

        {

          /* Imaginary part is 0.0.  */

          __real__ retval = HUGE_VAL;

          __imag__ retval = __imag__ x * __copysign (1.0, __real__ x);

        }

      else if (icls > FP_ZERO)

        {

          /* Imaginary part is finite.  */

          double sinix, cosix;

          __sincos (__imag__ x, &sinix, &cosix);

          __real__ retval = __copysign (HUGE_VAL, cosix);

          __imag__ retval = (__copysign (HUGE_VAL, sinix)

                             * __copysign (1.0, __real__ x));

        }

      else

        {

          /* The addition raises the invalid exception.  */

          __real__ retval = HUGE_VAL;

          __imag__ retval = __nan ("") + __nan ("");

#ifdef FE_INVALID

          if (icls == FP_INFINITE)

            feraiseexcept (FE_INVALID);

#endif

        }

    }

  else

    {

      __real__ retval = __nan ("");

      __imag__ retval = __imag__ x == 0.0 ? __imag__ x : __nan ("");

    }

  return retval;

}

weak_alias (__ccosh, ccosh)

#ifdef NO_LONG_DOUBLE

strong_alias (__ccosh, __ccoshl)

weak_alias (__ccosh, ccoshl)

#endif