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