NAME
        IEEESPNeg -- compute negative value of IEEE single precision number

   SYNOPSIS
          x   = IEEESPNeg(  y  );
          d0               d0

        float   x,y;

   FUNCTION
        Invert the sign of argument y and return it to caller.

   INPUTS
        y - IEEE single precision floating point value

   RESULT
        x - IEEE single precision floating point value

   BUGS

   SEE ALSO