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 Content of type "text/html" skipped
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