public void ModDiv(ref BigIntegerBuilder regDen, ref BigIntegerBuilder regQuo)
{
if (regDen._iuLast == 0)
{
regQuo.Set(DivMod(regDen._uSmall));
NumericsHelpers.Swap <BigIntegerBuilder>(ref this, ref regQuo);
}
else if (_iuLast != 0)
{
ModDivCore(ref this, ref regDen, true, ref regQuo);
}
}