ficl2UnsignedArithmeticShiftLeft
addend = ficl2UnsignedArithmeticShiftLeft(addend);
mask = ficl2UnsignedArithmeticShiftLeft(mask);
subtrahend = ficl2UnsignedArithmeticShiftLeft(subtrahend);
ficl2UnsignedArithmeticShiftLeft(ficl2Unsigned x);