YJIT: Building a New JIT Compiler for CRuby - Shopify

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This post details the development of YJIT, a new Just-in-Time (JIT) compiler for CRuby, built using the Basic Block Versioning (BBV) architecture. It highlights the motivation for YJIT due to the limitations of MJIT in real-world applications like Rails. The post presents current benchmark results showing significant speedups over the CRuby interpreter and discusses the advantages of BBV for dynamically-typed code, including specialization based on type information and runtime patching. It also outlines next steps, including merging YJIT into Ruby 3.1 and potential future improvements to CRuby's architecture to further enhance JIT performance.