No, I wasn't aware of this project. My starting point was: http://static.usenix.org/events/vee05/full_papers/p153-yunhe.pdf Yunhe Shi, David Gregg, Andrew Beatty, M. Anton Ertl, 2005
See also my email to python-dev that I sent in 2012: https://mail.python.org/pipermail/python-dev/2012-November/122777.html Ah, my main issue was my implementation is that I started without taking care of clearing registers when the stack-based bytecode implicitly cleared a reference (decref), like "POP_TOP" operation. I added "CLEAR_REG" late in the development and it caused me troubles, and the "correct" register-based bytecode was less efficient than bytecode without CLEAR_REG. But my optimizer was very limited, too limited. Another implementation issue that I had was to understand some "implicit usage" of the stack like try/except which do black magic, whereas I wanted to make everything explicit for registers. I'm talking about things like "POP_BLOCK" and "SETUP_EXCEPT". In my implementation, I kept support for stack-based bytecode, and so I had some inefficient code and some corner cases. My approach was to convert stack-based bytecode to register-based bytecode on the fly. Having both in the same code allowed to me run some benchmarks. Maybe it wasn't the best approach, but I didn't feel able to write a real compiler (AST => bytecode). Victor Le mar. 26 févr. 2019 à 21:58, Neil Schemenauer <nas-pyt...@python.ca> a écrit : > > On 2019-02-26, Victor Stinner wrote: > > I made an attempt once and it was faster: > > https://faster-cpython.readthedocs.io/registervm.html > > Interesting. I don't think I have seen that before. Were you aware > of "Rattlesnake" before you started on that? It seems your approach > is similar. Probably not because I don't think it is easy to find. > I uploaded a tarfile I had on my PC to my web site: > > http://python.ca/nas/python/rattlesnake20010813/ > > It seems his name doesn't appear in the readme or source but I think > Rattlesnake was Skip Montanaro's project. I suppose my idea of > unifying the local variables and the registers could have came from > Rattlesnake. Very little new in the world. ;-P > > Cheers, > > Neil -- Night gathers, and now my watch begins. It shall not end until my death. _______________________________________________ Python-Dev mailing list Python-Dev@python.org https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
