Partial bitwise permutation instructions are provided in a microprocessor or microcontroller. Partial bitwise permutations may be specified by one or more of the following: a destination specifier, a previous partial value source, a destination subset specifier, and a control specifier....http://www.google.com.hk/patents/US7237097?utm_source=gb-gplus-share專利 US7237097 - Partial bitwise permutations
