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Date: Mon, 17 Aug 2015 00:14:11 +0200
From: Agnieszka Bielec <>
Subject: Re: PHC: Argon2 on GPU

2015-08-16 23:51 GMT+02:00 Solar Designer <>:
> On Sun, Aug 16, 2015 at 10:27:27PM +0200, Agnieszka Bielec wrote:
>> 2015-08-16 16:09 GMT+02:00 Solar Designer <>:
>> > 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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