NAME
        IEEEDPNeg -- compute negative value of IEEE double precision number

   SYNOPSIS
          x   = IEEEDPNeg(  y  );
        d0/d1             d0/d1

        double  x,y;

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

   INPUTS
        y - IEEE double precision floating point value

   RESULT
        x - IEEE double precision floating point value

   BUGS

   SEE ALSO