Re: Optimizer discussion

Hi Graham, Simple things first: On Fri, Jun 5, 2009 at 1:08 AM, Graham Kelly <grahamk@facebook.com> wrote: > I'm not sure which optimization you are talking about with the GLOBALS stuff but what your > saying makes sense. (Its been awhile since I've looked at the code base myself, I'm just > getting back to working on it) I copied that comment straight from the source, but I can't find it now that I went looking for it. No matter. > Why not start off with the big stuff, dataflow. I personally believe that working out good data > flow for PHP is key to getting good optimizations. But you are right, its a very tricky thing to do > and in some cases impossible. Ultimately, I would like to move a lot of the optimizer work more into > this direction and use the data flow to build a basic platform for code analysis on which > optimizations can be done. For now though, pecl/optimizer is "dumb" about data types :-) And now the hard stuff. To avoid me repeating myself, let me just pimp my Tech Talk. Have a look at http://www.youtube.com/watch?v=kKySEUrP7LA from about the 30:45 mark until just before the 47:00 mark (slides at https://www.cs.tcd.ie/~pbiggar/paul_biggar_google_18_mar_2009_notes.pdf). That highlights most of the problems, and vaguely hints at their solution. We can go into much greater detail on the solutions after. Thanks, Paul -- Paul Biggar paul.biggar@gmail.com