Logical shift instructions
•Shift to the left:
•11111111   ->   11111110   ; shift by 1
•11111110   ->   11110000   ; shift by 3
•shl  mem/reg, imm/reg
•shl eax, 1
•shl byte ptr [eax], ecx
•Shift to the right:
•11111111   ->   01111111   ; shift by 1
•01111111   ->   00001111   ; shift by 3
•shr  mem/reg, imm/reg
•shr eax, 1
•shr byte ptr [eax], ecx
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