Emulation methods are provided for two PACK instructions, one for Unicode data and the other for ASCII coded data in which processing is carried out in a block-by-block fashion as opposed to a byte-by-byte fashion as a way to provide superior performance in the face of the usual challenges facing the...http://www.google.fr/patents/US7868791?utm_source=gb-gplus-shareBrevet US7868791 - Pack unicode zSeries instructions
