NAME
        IEEESPTanh -- compute the hyperbolic tangent of a floating point number

   SYNOPSIS
          x   = IEEESPTanh(  y  );
        d0                 d0

        float   x,y;

   FUNCTION
        Compute hyperbolic tangent of y in IEEE single precision

   INPUTS
        y - IEEE single precision floating point value

   RESULT
        x - IEEE single precision floating point value

   BUGS

   SEE ALSO
        ieeespsinh(), ieeespcosh()