On Tuesday, 29 November 2016 at 11:53:06 UTC, Walter Bright wrote:
http://www.felixcloutier.com/x86/I find this easier to use for quick lookups than the Intel PDF files, because any instruction is just 2 clicks away.
Just merge and split the PDFs so you have a PDF with just the instructions and a single bookmarks for each one. That's what I did.