JIT for PHP project

Hi @internals, I'm glad to say that we have started a new JIT for PHP project and hope to deliver some useful results for the next PHP version (probably 8.0). We are very early in the process and for now there isn't any real performance improvement yet. So far we spent just 2 weeks mainly working on JIT infrastructure for x86/x86_64 Linux (machine code generation, disassembling, debugging, profiling, etc), and we especially made the JIT code-generator as minimal and simple as possible. The current state, is going to be used as a starting point for research of different JIT approaches and their usability for PHP. The code is available at: https://github.com/zendtech/php-src/tree/jit-dynasm/ext/opcache/jit The sources may be built and tested as regular PHP (no any special external dependencies required). JIT itself is implemented as a part of Opcache. You may try it in action: sapi/cli/php -d opcache.jit_buffer_size=32M Zend/bench.php sapi/cli/php -d opcache.jit_buffer_size=32M -d opcache.jit_debug=1 Zend/bench.php 2>&1 | less As I mentioned we didn't try to achieve any real performance improvement yet, although we do currently see 20% speedup on bench.php, but a bit of a slowdown on real-life apps. Wish us luck :) Thanks. Dmitry.