newlib/winsup/cygwin/math/csinh.def.h

/*
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 as GPL compatible by the Free Software Foundation (FSF).

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      in the documentation and/or other materials provided with the
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      products derived from this software without prior written permission
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      with the copyright holders.
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 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY EXPRESSED
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*/

__FLT_TYPE __complex__ __cdecl
__FLT_ABI(csinh) (__FLT_TYPE __complex__ z)
{
  __complex__ __FLT_TYPE ret;
  __FLT_TYPE s_x, c_x;
  int negate = signbit (__real__ z);
  int r_class = fpclassify (__real__ z);
  int i_class = fpclassify (__imag__ z);

  __real__ z = __FLT_ABI(fabs) (__real__ z);

  if (r_class == FP_NAN)
  {
    __real__ ret = __FLT_NAN;
    __imag__ ret = __imag__ z == __FLT_CST(0.0) ? __imag__ z : __FLT_NAN;

    return ret;
  }

  if (r_class == FP_INFINITE)
  {
    if (i_class == FP_ZERO)
    {
      __real__ ret = negate ? -__FLT_HUGE_VAL : __FLT_HUGE_VAL;
      __imag__ ret = __imag__ z;
      return ret;
    }

    if (i_class == FP_NAN || i_class == FP_INFINITE)
    {
      __real__ ret = __FLT_HUGE_VAL;
      __imag__ ret = __FLT_NAN + __FLT_NAN;

      return ret;
    }
    __FLT_ABI(sincos) (__imag__ z, &s_x, &c_x);

    __real__ ret = __FLT_ABI(copysign) (__FLT_HUGE_VAL, c_x);
    __imag__ ret = __FLT_ABI(copysign) (__FLT_HUGE_VAL, s_x);

    if (negate)
    __real__ ret = -__real__ ret;
    return ret;
  }

  if (i_class == FP_NAN || i_class == FP_INFINITE)
  {
    __real__ ret = (r_class == FP_ZERO
      ? (__FLT_ABI(copysign) (__FLT_CST(0.0), negate ? -__FLT_CST(1.0) : __FLT_CST(1.0))) : __FLT_NAN);
    __imag__ ret = (r_class == FP_ZERO ? (__FLT_NAN + __FLT_NAN) : __FLT_NAN);

    return ret;
  }

  __FLT_ABI(sincos) (__imag__ z, &s_x, &c_x);

  __real__ ret = __FLT_ABI(sinh) (__real__ z) * c_x;
  __imag__ ret = __FLT_ABI(cosh) (__real__ z) * s_x;

  if (negate)
    __real__ ret = -__real__ ret;
  return ret;
}