Starting around 2015, many processors have moved to a 64-bit format. These generally retained a 32-bit instruction format, while expanding the internal registers to a 64-bit format.<ref>{{cite book |title=Alpha Architecture Handbook |publisher=DEC |url=http://www.cs.cmu.edu/afs/cs/academic/class/15740-f03/public/doc/alpha-ref.pdf |date=October 1996 |page=1.4}}</ref> By the original definition, these are compressed instructions, as they are smaller than the basic data word size. However, this term is not used in this context, references to compressed instructions invariably refer to 16-bit versions.<ref>{{cite book |title=Alpha Architecture Handbook |publisher=DEC |url=http://www.cs.cmu.edu/afs/cs/academic/class/15740-f03/public/doc/alpha-ref.pdf |date=October 1996 |page=1.4}}</ref>
