37. Shift Instructions

• Shift left format:

          shl  destination, count
          shl  destination, cl
  

• Shift right format:

          shr  destination, count 
          shr  destination, cl
  

  where count is an immediate value.

• Semantics:

  • Performs left/right bit-shift of destination by the value in count or CL register.

  • CL register contents is not altered.