Guilherme Ottoni
a12865c040
This diff reserves r11 for the GP scratch register used by the CodeGenerator (in case no better register is available). rScratch (r10) is now reserved for the assembler, and was renamed to rAsm. This avoids a class of subtle bugs where code-gen mixed uses of rScratch with calls to the assembler that could also make use of this register. (Tx64 code still uses rScratch/rAsm for now.) While here, also moved the reserved XMM scratch registers from the assembler to CodeGenerator, since the assembler doesn't really use them. (The uses of these registers in Tx64 were renamed back to xmm0/xmm1 as they were until recently.)
HipHop VM for PHP 
HipHop VM (HHVM) is a new open-source virtual machine designed for executing programs written in PHP. HHVM uses a just-in-time compilation approach to achieve superior performance while maintaining the flexibility that PHP developers are accustomed to. HipHop VM (and before it HPHPc) has realized > 5x increase in throughput for Facebook compared with Zend PHP 5.2.
HipHop is most commonly run as a standalone server, replacing both Apache and modphp.
Installing
You can install a prebuilt package or compile from source.
Running
You can run standalone programs just by passing them to hhvm: hhvm my_script.php.
HipHop bundles in a webserver. So if you want to run on port 80 with document root /var/www:
sudo hhvm -m server /var/www
For anything more complicated, you'll want to make a config.hdf and run sudo hhvm -m server -c config.hdf.
Contributing
We'd love to have your help in making HipHop better. If you run into problems, please open an issue, or better yet, fork us and send a pull request.
If you want to help but don't know where to start, try fixing some of the Zend tests that don't pass. You can run them with hphp/test/run. When they work, move them to zend/good and send a pull request.
Before changes can be accepted a Contributors Licensing Agreement must be signed.
Licence
HipHop VM is licensed under the PHP and Zend licenses except as otherwise noted.