Wow, I was surprised to see my article from 2013 appear on HN today! (It's hard to believe that the article is 10 years old.) In that time, the x86 documentation has expanded from four volumes to 10 volumes. Curiously, the number of pages has only grown by 21% (4181 pages to 5066). The x86 instruction set has added a bunch of features: AVX, FMA3, TSX, BMI, VNNI, and CET. But I guess the number of new instructions is relatively small compared to the existing ones.
