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()