return roundAndPackFloat64( zSign, zExp - shiftCount, zSig<<shiftCount );
return roundAndPackFloat64( roundData, zSign, zExp - shiftCount, zSig<<shiftCount );
 normalizeRoundAndPackFloat64( flag zSign, int16 zExp, bits64 zSig ){    int8 shiftCount;    shiftCount = countLeadingZeros64( zSig ) - 1;    return roundAndPackFloat64( zSign, zExp - shiftCount, zSig<<shiftCount );}