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     ldiv, lrem - long division

     ldiv(hidividend, lodividend, divisor)

     lrem(hidividend, lodividend, divisor)

     The concatenation of the signed 16-bit hidividend and the
     unsigned 16-bit lodividend is divided by divisor.  The 16-
     bit signed quotient is returned by ldiv and the 16-bit
     signed remainder is returned by lrem.  Divide check and
     erroneous results will occur unless the magnitude of the
     divisor is greater than that of the high-order dividend.

     An integer division of an unsigned dividend by a signed
     divisor may be accomplished by

             quo = ldiv(0, dividend, divisor);

     and similarly for the remainder operation.

     Often both the quotient and the remainder are wanted.
     Therefore ldiv leaves a remainder in the external cell

     No divide check check.