x86-64-opcodes is automatically generated from Mahdi Safsafi's opcodesDB (https://github.com/MahdiSafsafi/opcodesDB). This system provides access to information about X86-64 opcodes and registers from Common Lisp. If this system is loaded then (gethash "add" *i-hash*) will return a list of all instructions associated with the mnemonic "add", etc. X86-64 registers are defined as constants with the same name as is generally used by assembly language programmers. I decided that deviation from the Common Lisp convention of bracketing constants with '+ was justified, in this case. Read the file "x86-64-classes.lisp" to learn about classes, slots and slot accessors. Read Mahdi Safsafi's documentation and the manuals from the CPU manufacturers for more information.