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Date: Tue, 3 Mar 2015 17:26:50 +0200
Message-ID: <2adbb2d21fe37bdd9d841da5c62966c5@mail.gmail.com>
To: Julien Pauli <jpauli@php.net>
Cc: PHP Internals <internals@lists.php.net>
Content-Type: text/plain; charset=UTF-8
Subject: RE: [PHP-DEV] Re: Zend JIT Open Sourced
From: zeev@zend.com (Zeev Suraski)

> -----Original Message-----
> From: julienpauli@gmail.com [mailto:julienpauli@gmail.com] On Behalf Of
> Julien Pauli
> Sent: Tuesday, March 03, 2015 5:11 PM
> To: Zeev Suraski
> Cc: Anthony Ferrara; PHP Internals
> Subject: Re: [PHP-DEV] Re: Zend JIT Open Sourced
>
> On Tue, Mar 3, 2015 at 2:05 PM, Zeev Suraski <zeev@zend.com> wrote:
>
>
> 	> So I do apologize to the person. I don't to the code.
>
> 	I wanted to verify whether my gut was correct (minimal amount of
> output, and
> 	stdout is in fact buffered - output shouldn't move the needle) and
> asked
> 	Dmitry to rerun the C test on the same system, but this time with the
> output
> 	code completely commented out:
> 	real 0m0.011s  (+- 0.01)
> 	user 0m0.011s  (+- 0.01)
> 	sys 0m0.001s
>
> 	Apologies to the code might be in order :)
>
> 	The source of the JIT engine's edge is, as Dmitry and Andi said, the
> 	CPU-specific optimizations that gcc -O2 doesn't generate, and
> therefore it
> 	can actually be faster than a generic native executable in some (I
> would
> 	guess not all that common) cases.
>
>
>
> That's why one may run GCC -march=native when mastering the hardware.
> I guess here, no JIT can outperform that.

Of course, but the vast majority of people don't build their own binaries.
internals@ audience may not be the best sample to gauge that percentage,
though :)

Zeev