john-users - Re: John the Ripper 1.7.2

Openwall GNU/*/Linux 3.0 - a small security-enhanced Linux distro for servers

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Date: Mon, 22 May 2006 11:30:46 +0000 (UTC)
From:  Phantom <phantom_otw@...oo.com>
To: john-users@...ts.openwall.com
Subject:  Re: John the Ripper 1.7.2

> So for the time being, I am satisfied with the brand new 16-registers
> code being about as fast as the old 8-registers one is.  In future
> versions, I might further improve the Perl script to do smarter register
> allocation, taking into account the fact that consecutive instructions
> which access registers XMM8-XMM15 have a higher cost on AMD64
> processors.  (In my testing, the slowdown is seen with 4+ consecutive
> instructions like that, but in real-world code there are more
> constraints.)  I might also generate some hybrid native x86-64 + SSE2
> code, which might make this issue irrelevant... or it might not. 
> 


Great to see this kind of development in our beloved tool :)
Hopefully you will find a nice way to improve the register allocation
in the near future...
That hybrid native x86-64 + SSE2 do sounds quite exciting *S*
Thank you and keep up the good work!

Regards