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The ROTATE instructions cycle bit values through a register if done
repeatedly. The SHIFT instructions do not recycle bits shifted out.
 
Mnemonic      Name
RCL           Rotate Through Carry Left
RCR           Rotate Through Carry Right
ROL           Rotate Left
ROR           Rotate Right
SAL           Shift Arithmetic Left (identical to SHL)
SAR           Shift Arithmetic Right (preserves sign)
SHL           Shift Left
SHR           Shift Right (does not preserve sign)
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