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This change leverages a technique named "threaded interpreter" to speedup the Rust interpreter. Basically, it splits a giant match statement into multiple smaller individual functions, each handling a specific opcode. When we have a group of opcodes(e.g., a basic block), we can extract the handler function(also named "thread") for each instruction's opcode. Then we can simple run each handler function to execute each instructions. This way we can aid CPU's branch predictor to better predict what code to execute next.
Note this work is inspired from @mohanson's original work at here:
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Reference: