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Message-ID: <CAKGDhHVRc=TCWjY5=y4Z5r-h_sgKDd0+gLYnQrFwOZ0DmLwmJQ@mail.gmail.com>
Date: Mon, 17 Aug 2015 00:14:11 +0200
From: Agnieszka Bielec <bielecagnieszka8@...il.com>
To: john-dev@...ts.openwall.com
Subject: Re: PHC: Argon2 on GPU
2015-08-16 23:51 GMT+02:00 Solar Designer <solar@...nwall.com>:
> On Sun, Aug 16, 2015 at 10:27:27PM +0200, Agnieszka Bielec wrote:
>> 2015-08-16 16:09 GMT+02:00 Solar Designer <solar@...nwall.com>:
>> > bi+i is used to index an array if 16-byte elements, so it needs to be
>> > multiplied by 16 each time (unless the compiler manages to optimize
>> > this, perhaps much like you had done manually in the first version).
>>
>> if something is not supported why I have on my laptop the opposite of
>> this slowdown on AMD?
>
> It is possible that index scaling by 16 is not supported on AMD GCN, but
why speed is fine when GWS=1024 is set before john ?
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