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Date: Sat, 13 Oct 2012 02:31:15 +0400
From: Solar Designer <>
Subject: Re: bitslice DES on GPU

Hi Sayantan,

I'm sorry I have no time to seriously look into this sub-project lately.

On Fri, Oct 12, 2012 at 09:04:32AM +0530, Sayantan Datta wrote:
>  I am now using bitselect() and AMD sboxes for AMD gpus.

Great.  Does this no longer cause a slowdown?

> So my kernel is
> mostly at its final stages requiring the tweaks for latency and registers
> in the sboxes. Can you provide some idea regarding this.

I think it's premature.  In fact, I think that several of your recent
optimizations were premature (I'm sorry I did not have time to comment).
What use is speeding it up by a few percent when it's like 10x slower
than expected?  Well, you may do that to make it a bit more useful
temporarily, until we have time to seriously look into the bottlenecks
and hopefully resolve them.

> Also I'm thinking
> to port cmp_all and cmp_one to opencl. Also is it possible/viable to port
> get_hash() to opencl?

Of these, under the current formats interface, only cmp_all() is likely
reasonable to have on GPU.  Further speedup in this area is possible
once we integrate the formats interface changes that I implemented for
myrice's work this summer (they're not committed yet, except to myrice's
experimental trees).



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