Apparatus for determining if, during the shifting of data there has been a loss of precision due to the loss of one or more data bits due to overflow. A small data field is shifted into a much larger data, field. The width of the switching mechanism used is based on the number of bits in the small data...http://www.google.com/patents/US4931970?utm_source=gb-gplus-sharePatent US4931970 - Apparatus for determining if there is a loss of data during a shift operation
