[Python-Dev] A new JIT compiler for a faster CPython? (original) (raw)

Maciej Fijalkowski fijall at gmail.com
Wed Jul 18 11:10:32 CEST 2012

However, it requires that the JIT compiler knows about a lot of optimisations. PyPy's JIT is full of those. It's not the fact that it has a JIT compiler at all that makes it fast and not the fact that they compile Python to machine code, it's the fact that they came up with a huge bunch of specialisations that makes lots of code patterns fast once it detected them. LLVM (or any other low-level JIT compiler) won't help at all with that. Stefan

Very good point Stefan

I would just like to add that a lot of those also require changes in the object model which might render changes in CPython C API (like the introduction of maps). Certainly you can't keep the current C structures, which will already break some code.

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