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Date: Mon, 9 Jul 2012 12:42:47 +0530
From: Sayantan Datta <std2048@...il.com>
To: john-dev@...ts.openwall.com
Subject: Re: Rotate and bitselect investigation
On Mon, Jul 9, 2012 at 12:00 PM, Solar Designer <solar@...nwall.com> wrote:
> Wow. I wonder if this trick for SHA-1 was known at all. Not to us, it
> seems. The second bitselect() is essentially an and-not, so the speed
> might be better if it's written as such (if there's an and-not
> instruction). Also, I guess this change should hurt on NVIDIA (does
> it?), so you'll need to wrap it in some #ifdef.
>
Yes I did wrap it in #ifdef. Bitselct is a single instruction on 7970 and
it can be modified in million different ways. So one may try differnt
combination of bitselect for other logical expressions also.
Regards,
Sayantan
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