A deep dive into optimizing the Plush interpreter through inline caching and code patching techniques. The author implements four key optimizations targeting hash lookup overhead in field access, method calls, and object construction, achieving a 3.5x performance improvement for a raytracer benchmark. The optimizations include inline caches for get_field and set_field instructions, constructor resolution improvements, and method call optimization, ultimately reducing single-threaded render time from 700ms to 196ms.
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