Yeah, it could be patents. The efficient hardware implementation of these instructions was patented by the Princeton researchers that developed it, and this wor

Yeah, it could be patents. The efficient hardware implementation of these instructions was patented by the Princeton researchers that developed it, and this work was sponsored by Intel (and the Department of Defense). One could reasonably assume that the sponsor of the work would have access to the patent on very favorable terms. Some details at [1]. [1] https://twitter.com/trav_downs/status/1202863930210734080 https://twitter.com/trav_downs/status/1202863930210734080