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Date: Sat, 26 Jan 2013 23:58:29 +0100
From: magnum <john.magnum@...hmail.com>
To: john-dev@...ts.openwall.com
Subject: Re: Proposed optimizations to pwsafe
On 26 Jan, 2013, at 23:51 , Milen Rangelov <gat3way@...il.com> wrote:
> Hm, I guess the compiler got smarter and was able to generate the bfi_int when not explicitly doing bitselect(). This was not the case some ago and that's good news. Need to do some experiments and check the ISA generated.
I think we should do it anyway (for now, at least).
What is much more annoying is that bitselects on nvidia hurts performance (last time I checked). That is just weird. I mean, OK if they do not have a hardware instruction but they should definitely not end up slower than using the spelled out syntax. Or is it harder than I imagine?
magnum
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