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Date: Sat, 26 Jan 2013 23:48:54 +0100
From: Lukas Odzioba <lukas.odzioba@...il.com>
To: john-dev@...ts.openwall.com
Subject: Re: Proposed optimizations to pwsafe
2013/1/26 Milen Rangelov <gat3way@...il.com>:
> Just a side note, I just had a look at your opencl pwsafe code and there are
> obvious optimizations that can be done. Some are minor, but the most
> important is the following. You have this:
>
>
> #define Ch(x, y, z) (z ^ (x & (y ^ z)))
> #define Maj(x, y, z) ((y & z) | (x & (y | z)))
>
> If you replace those by:
>
> #define Ch(x,y,z) (bitselect(z,y,x))
> #define Maj(x,y,z) (bitselect(y, x,(z^y)))
Yes I tried that a few days ago on my 5850 and didn't get any speedup.
Thanks for sharing.
Lukas
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