A pipelined data unit for use in a data processor, the data unit having special input operand check logic for involking a precise exception handling mechanism if either or both of the input operands fails the check, and output result format logic for involking an imprecise exception handling mechanism...http://www.google.com.hk/patents/US4903264?utm_source=gb-gplus-share專利 US4903264 - Method and apparatus for handling out of order exceptions in a pipelined data unit
