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Same as SHR, except that most-significant bit (MSB) is shifted back to itself.
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This preserves the original sign of the destination operand, because MSB is the sign bit.
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Each shift divides the destination operand by 2, while preserving the sign.
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For example,
mov cl, -74 ; 2's complement of -74 is 0B6h sar cl, 1 ; CL is now -37, or 0DBh -
Note that LSB is shifted into the carry flag CF.
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Operation of SAR CL, 1 :
