Actually I'm wondering why this is not generally used for JITing Perl.

Three semi-informed guesses:

• Perl's internal data structures (SVs and casting between similarly shaped structs) don't make JITting easy.
• Perl's internal implementation (opcodes being a big mass of macros calling functions calling macros) doesn't make JITting easy.
• Code paths and function bodies are too long to JIT well.

These can all be solved, but it would surprise me if they were solved easily.

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