Just so I'm clear: you plan to move this to the thread state later but only on main right? So that we don't change the struct layout in an rc for 3.14?

Can you please add a Py_NO_INLINE to the _PyOptimizer_Optimize function too? I don't think this will fix it as if it's inlined, the alloca might be hoisted out to the main interpreter loop by the compiler.

Can you please add a Py_NO_INLINE to the _PyOptimizer_Optimize function too? I don't think this will fix it as if it's inlined, the alloca might be hoisted out to the main interpreter loop by the compiler.

Yes, but not in this PR as it seems unrelated

Just so I'm clear: you plan to move this to the thread state later but only on main right? So that we don't change the struct layout in an rc for 3.14?

Yes, that's the plan.

We've already started moving the buffers to the heap, so this won't be needed.