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   NAME
        IEEEDPCmp -- compare two double precision floating point numbers

   SYNOPSIS
          c   = IEEEDPCmp(  y  ,  z  );
          d0              d0/d1 d2/d3

        double  y,z;
        long    c;

   FUNCTION
        Compare y with z. Set the condition codes for less, greater, or
        equal. Set return value c to -1 if y<z, or +1 if y>z, or 0 if
        y == z.

   INPUTS
        y -- IEEE double precision floating point value
        z -- IEEE double precision floating point value

   RESULT
       c = 1   cc = gt         for (y > z)
       c = 0   cc = eq         for (y == z)
       c = -1  cc = lt         for (y < z)

   BUGS

   SEE ALSO