> and maybe SSE2 For x86-64, SSE2 came with the original x86-64 release in 1999/2000 (according to Wikipedia, it was announced in 1999 and the full specificati

> and maybe SSE2 For x86-64, SSE2 came with the original x86-64 release in 1999/2000 (according to Wikipedia, it was announced in 1999 and the full specification became available in August 2000), so if patents are limited to 20 years, it's already out of patent.