Re: What's the status of the JIT?
Hi brent, your mail went straight to spam, i don't really know the cause
but most people were unable to see this issue.
Kindly restructure the message and resend.
On Fri, 14 Nov 2025, 10:49 am Brent Roose, <brent.roose@jetbrains.com>
wrote:
> Hi internals
>
> I'm wondering about the state of PHP's JIT these days. I understand that
> Dmitry is still working on his standalone JIT IR framework [1] that's being
> used by PHP, and that Arnaud is maintaining it from the Foundation/PHP
> side? In my own benchmarks, done in PHP 8.0 and PHP 8.4; I cannot seem to
> get any meaningful performance gain from the JIT in web applications or in
> tools like PHPStan. [2][3][4]
>
> The question I'm left with is whether the JIT is worth the hassle?
> Assuming the JIT's existence impacts the complexity of internal
> development, I wonder if it wouldn't be better to deprecate it in a future
> PHP version? To be clear, I'm assuming the JIT impacts internal development
> — maybe that's wrong? Perhaps I'm missing a real-life use case that
> benefits significantly from the JIT as well?
>
> Kind regards
> Brent
>
> [1] https://github.com/dstogov/ir
> [2] https://stitcher.io/blog/jit-in-real-life-web-applications
> [3] https://youtu.be/2Njl1ZiCXIk?si=qytMIVxt0oTC3b1F&t=1057
> [4] https://www.youtube.com/watch?v=5ResKrAnpBw
>
Thread (4 messages)