| 摘要 |
An apparatus that performs a left shift operation includes a shifter unit that contains the value to be shifted, a flag having an input coupled to the left-most bit of the shifter unit for receiving sign bit information for the value to be shifted, an overflow detector having inputs coupled to the shifter unit and the flag for determining the existence of an overflow condition, and a shift counter having outputs coupled to the shifter unit and the overflow detector.
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