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CS/CoE0447: Computer Organization and Assembly Language. University of Pittsburgh. 40. Shift Instructions. ? “Move” bits in a register.The ROL (rotate left) instruction shifts each bit to the left. The highest bit is copied into the Carry flag and the lowest bit position. ? No bits are lost. sal (or its synonym shl ) left shifts (multiplies) a byte, word, or long value for a count specified by an immediate value and stores the product in that byte, Logical Shift InstructionsEdit. In a logical shift instruction (also referred to as unsigned shift), the bits that slide off the end disappear (except for Register shift operations move the bits in a register left or right by a specified number of bits, called the shift length. Register shift can be performed:. Shift instructions move a bit string (or operand treated as a bit string) to the right or left, with excess bits discarded (although one or more bits might be