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Date: Thu, 19 Sep 2013 08:59:36 -0400
From: Yaniv Sapir <yaniv@...pteva.com>
To: john-dev <john-dev@...ts.openwall.com>
Subject: Re: bcrypt-parallella on 64-core (was: Katja's weekly
report #13)
So, IIUC, R38 is loaded from some external address (0x8f00****), which is
contrary to what you mention in the beginning, isn't it?
On Thu, Sep 19, 2013 at 8:08 AM, Katja Malvoni <kmalvoni@...il.com> wrote:
> On Thu, Sep 19, 2013 at 1:59 PM, Yaniv Sapir <yaniv@...pteva.com> wrote:
>
>> These come from compiled code, or your optimized assembly?
>>
>
> r38 comes from my code but it's not external load, one member of P array
> is loaded into r38 but P array is in local memory.
>
>
>> What I would do is track down the source of the address for these loads
>> in the asm listing, and see if I can tell.
>>
>
> I tried to do that, but for some loads I wasn't able to track it to the
> specific number. Most of the registers used as base address are set up
> using arithmetic or logical operations and I hoped it's possible to avoid
> manually calculating addresses.
>
> The only number I found is movt r36,0x8f00 and ldrb r38,[r36,+0x0] later
>
> Katja
>
--
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Yaniv Sapir
Adapteva Inc.
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Email: yaniv@...pteva.com
Web: www.adapteva.com
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