Message 286591 - Python tracker (original) (raw)

Message286591

Author	vstinner
Recipients	Jeremy.Hylton, Trundle, alex, benjamin.peterson, berker.peksag, brett.cannon, daniel.urban, dmalcolm, eltoder, eric.snow, georg.brandl, gregory.p.smith, isoschiz, jcon, mark.dickinson, meador.inge, methane, nadeem.vawda, ncoghlan, pconnell, pitrou, pstch, rhettinger, santoso.wijaya, serhiy.storchaka, techtonik, terry.reedy, vstinner
Date	2017-02-01.07:04:06
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<CAMpsgwZbNRj+EJssS=nS_eDEQLHf9ubwd3b=9yXBzJ05GhbfaQ@mail.gmail.com>
In-reply-to	1485930555.34.0.717877154176.issue11549@psf.upfronthosting.co.za

Content
If you would like to implement constant folding at the AST level, I suggest you to look at my fatoptimizer project: https://github.com/haypo/fatoptimizer/blob/master/fatoptimizer/const_fold.py The tricky part is to avoid operations when we know that it will raise an exception or create an object too big according to our constraints. I would prefer to implement an AST optimizer in Python, but converting C structures to Python objects and then back to C structures has a cost. I'm not sure that my optimizer implemented in Python is fast enough. By the way, an idea would be to skip all optimizations in some cases like for script.py when running python3 script.py.

Content

If you would like to implement constant folding at the AST level, I suggest you to look at my fatoptimizer project: https://github.com/haypo/fatoptimizer/blob/master/fatoptimizer/const_fold.py The tricky part is to avoid operations when we know that it will raise an exception or create an object too big according to our constraints. I would prefer to implement an AST optimizer in Python, but converting C structures to Python objects and then back to C structures has a cost. I'm not sure that my optimizer implemented in Python is fast enough. By the way, an idea would be to skip all optimizations in some cases like for script.py when running python3 script.py.

History
Date	User	Action	Args
2017-02-01 07:04:07	vstinner	set	recipients: + vstinner, brett.cannon, georg.brandl, rhettinger, terry.reedy, gregory.p.smith, mark.dickinson, ncoghlan, pitrou, techtonik, nadeem.vawda, benjamin.peterson, alex, Trundle, methane, dmalcolm, meador.inge, daniel.urban, Jeremy.Hylton, santoso.wijaya, eltoder, eric.snow, jcon, berker.peksag, serhiy.storchaka, pconnell, isoschiz, pstch
2017-02-01 07:04:07	vstinner	link	issue11549 messages
2017-02-01 07:04:06	vstinner	create