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To: Dmitry Stogov <dmitry@zend.com>
CC: Zeev Suraski <zeev@zend.com>, Andrea Faulds <ajf@ajf.me>, 
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Subject: Re: [PHP-DEV] phpng: Refactored PHP Engine with Big Performance Improvement
From: rasmus@lerdorf.com (Rasmus Lerdorf)

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On 5/12/14, 11:05 PM, Dmitry Stogov wrote:
> Even in this 64-bit world, I would suggest to try 32-bit PHP. In most
> cases it shows better performance.
> X32 ABI would be ideal, but it's not widely supported yet.
>=20
> Anyway, PIC doesn't make significant slowdown on x86_64, because of
> additional CPU registers and special PIC support.
>=20
> We tried GOTO executor and, of course, it's faster.
> Actually, after all the optimizations, instruction dispatch overhead
> became more and more significant,
> so we will have to think about it.

But I don't think people are going to be building PHP 32-bit if the rest
of their system is all 64-bit. And PIC vs. non-PIC isn't really an issue
anymore as I suspected. We should be optimizing for 64-bit. By the time
phpng hits the world there will be even fewer 32-bit deploys out there.

-Rasmus


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