Re: [Python-Dev] Register-based VM [Was: Possible performance regression]

Let me just say that the code for METH_FASTCALL function/method calls is optimized for a stack layout: a piece of the stack is used directly for calling METH_FASTCALL functions (without any copying any PyObject* pointers). So this would probably be slower with a register-based VM (which doesn't imply that it's a bad idea, it's just a single point to take into account).