Feature or enhancement

Proposal:

Thanks to Matt's work on borrowed LOAD_FAST, we can now eliminate reference counting trivially in the JIT.

Ideally, we should use the cases generator to automatically do this. However, as a simple proof of concept, I will start with manually doing it for floats, as those are special cased and need to be manually written anyways.

I will then build on this by automatically doing it in the cases generator by analyzing the bytecodes for the vast majority of the operations.

This will finally allow proper register allocation in the JIT, as we won't have to spill everywhere there's a PyStackRef_CLOSE or something.

Has this already been discussed elsewhere?

No response given

Links to previous discussion of this feature:

No response

Linked PRs

• gh-134584: Decref elimination for float ops in the JIT #134588