Newsgroups: php.internals
Path: news.php.net
Xref: news.php.net php.internals:39388
Mailing-List: contact internals-help@lists.php.net; run by ezmlm
Received-SPF: error (pb1.pair.com: domain prohost.org from 64.233.166.182 cause and error)
Cc: php-dev List <internals@lists.php.net>
Message-ID: <F11EA58A-4825-48EA-B72E-1DADFE1C7663@prohost.org>
To: Graham Kelly <sgkelly4@gmail.com>
In-Reply-To: <e382ba0807251759q25563b46x30eb055735a29d65@mail.gmail.com>
Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes
Content-Transfer-Encoding: 7bit
Mime-Version: 1.0 (Apple Message framework v926)
Date: Sun, 27 Jul 2008 14:12:46 -0400
References: <e382ba0807251759q25563b46x30eb055735a29d65@mail.gmail.com>
Subject: Re: [PHP-DEV] GSoC Optimizer Update
From: ilia@prohost.org (Ilia Alshanetsky)

Great work, I've been periodically reviewing the commits and you're  
making excellent progress in terms of making the optimizer a general  
use tool. One thing I would suggest is creation of a "known issues"  
list, which can act as both a todo list and a warning list for people  
intending to use the optimizer.


On 25-Jul-08, at 8:59 PM, Graham Kelly wrote:

> Hi,
>
> My Google Summer of Code project is to develop and release an initial
> version on the optimizer originally being developed by Ilia. The  
> optimizer
> will be released to PECL as its own extension, however, it will  
> require APC
> in order to run.
>
> Ive worked on cleaning up bugs and testing the existing code. In  
> addition I
> have worked on refactoring some of the code to provide a base on  
> which to
> build a more powerful and more robust optimizer. I have added a few
> additional optimizations including:
> 1) Optimization of basic math identities
> 2) Optimization of silence blocks
> 3) More functions for which we can pre-calculate return values for  
> if they
> have all static parameters. (substr, acos, acosh, asin, asinh, atan,  
> atanh,
> cos, cosh, sin, sinh, tan, tanh, exp, log10, sqrt, atan2, ceil,  
> floor, fmod,
> ini_get [for PHP_INI_SYSTEM values only], ip2long, long2ip, trim,  
> chop,
> rtrim, ltrim, rad2deg, deg2rad, abs)
> 4) worked on making function optimization more aggressive to reduce  
> the
> number of required passes for full optimization.
> 5) A few more minor things here and there
>
> There are plans to change the optimizer hook in APC over to adding a  
> new
> compile layer. This should help give the optimizer better control as  
> well as
> make it more easily integrateable with other extensions.
>
> In the future I would like to work on a new control system and new  
> analysis
> tools for the optimizer. Hopefully such eventual changes will open  
> up the
> way for more powerful optimizations down the road. In addition there  
> are
> some APC specific optimizations that might be able to be done.
>
> Hopefully the initial release of the optimizer will in available in  
> PECL in
> the next few weeks. For now you can get it from pecl/optimizer in CVS.
>
> ~ Graham

Ilia Alshanetsky