Inline caches in the Skybison Python runtime.
Inline caching is a popular technique for optimizing dynamic language runtimes. The idea comes from the 1984 paper Efficient implementation of the Smalltalk-80 system (PDF) by L. Peter Deutsch and Allan M. Schiffman. I have written about it before (Inline caching and Inline caching: quickening), using a tiny sample interpreter.
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