Intel's 2003 patent: Method and apparatus for parallel table lookup using SIMD instructions https://patents.google.com/patent/US20040054879A1/en In July 2006, Intel noted that PSHUFB was available on the Core 2 Duo CPUs, such as the X6800, to some companies and universities working with error correction code. I recall some published programs that were using it later on that year (around September 2006). However I've seen one or more later patents (2010 or later) that include using PSHUFB for parallel table lookup, which doesn't make sense.   ... View more