RJIT: A Pure-Ruby JIT for Ruby

I’m Takashi Kokubun (@k0kubun), a Staff Developer at Shopify who works on optimizing YJIT full-time, which is Ruby’s production-grade JIT compiler written in Rust. While I work solely on YJIT during my work hours, I’ve also maintained another JIT in Ruby, MJIT, in my spare time. This year, I proposed to change the MJIT’s design to simplify the Ruby VM, which will ultimately make the YJIT developme