[svat]

Note that only a very small part of the TAOCP books is in assembly language. My count from a few years ago: https://news.ycombinator.com/item?id=14520230

Another way of counting is that the book "The MMIX supplement", which contains the MMIX equivalents of every single page/section/program in Volumes 1–3 that is affected by the details of MIX (the book is not by Knuth but the preface indicates Knuth reviewed it very thoroughly pre-publication), is 224 pages long.

Volumes 1, 2, 3 are together 672 + 784 + 800 = 2256 pages long (and Volume 4A is 912 pages). So roughly, less than 10% of TAOCP deals with either MIX specifically, or assembly language in general.