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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