The present invention provides a microinstruction for conditionally selecting one of two data values based upon control states of a processor. The microinstruction is preferably utilized in an out-of-order processor, although it may be used in conventional processors, to perform state dependent operations,...http://www.google.com.hk/patents/US5537560?utm_source=gb-gplus-share專利 US5537560 - Method and apparatus for conditionally generating a microinstruction that selects one of two values based upon control states of a microprocessor
