Crapjit is a weekend project I worked on whenever I wasnt playing Fallout4.
Crapjit is my proof of concept for a really sucky JIT compiler implementation. It takes its name from the terrible code it produces; far worse then unoptimised, however it makes up for this (a little) in simplicity and ease of implementation.
See blogpost for more info: https://the8bitpimp.wordpress.com/2015/11/30/crap-jit/