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Date: Wed, 30 Oct 2013 13:55:51 +0100
From: Katja Malvoni <>
Subject: Re: bcrypt-parallella on 64-core (was: Katja's weekly
 report #13)

Alexander, Yaniv -

what I see as the biggest problem is the fact that in all runs I did so far
at least one core stuck and never started computation (not counting 2nd
row). I thought it was because of external loads to specific registers
(r53, r0, r2, r38).

Another idea I have is to use local memory instead of external - with this
approach I would avoid external loads completely. But this approach failed
with E16 because stack would overwrite part of S-box in some cases. But
format would usually pass self test. I have that code somewhere so I'll
modify optimized code accordingly and try this approach, it might work (at
least for self test so that we can see performance).


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