Circuit and method for shifting or rotating operands of multiple size

摘要

A circuit and method for shifting or rotating operands of multiple size is disclosed. The method and circuit employs at least one shifting stage configured to receive and selectively shift an operand, and a first circuit coupled to and configured to receive the result of the shifting stage. The first circuit operates in accordance with signals received at first and second control nodes. The first circuit operates as a shifter for shifting or passing the result of the shifting stage in response to the first and second control nodes receiving a first shift or second shift signal, respectively. The first circuit also operates to logically OR one set of m consecutive bits of the result received from the shifting stage with another set of m consecutive bits of the result received from the shifting stage, in response to the first and second control nodes receiving an OR signal.