On Sun, Aug 12, 2012 at 4:30 AM, Victor Stinner <victor.stin...@gmail.com> wrote: > I started to implement an AST optimizer in Python. It's easy to create > a new AST tree, so I'm surprised that I didn't find any existing > project.
Very nice idea! > Other idea to improve this optimizer: > - move invariant out of loops. Example: "x=[]; for i in range(10): > x.append(i)" => "x=[]; x_append=x.append; for i in range(10): > x_append(i)". Require to infer the type of variables. But this is risky. It's theoretically possible for x.append to replace itself. Sure it may not be a normal or common thing to do, but it's possible. And yet it could be pretty advantageous for most programs. Perhaps the best way is to hide potentially-risky optimizations behind command-line options? The default mode could be to do every change that's guaranteed not to affect execution, and everything else is an extra (like French, music, and washing). ChrisA _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
