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Message-ID: <20120401203841.GB8785@openwall.com>
Date: Mon, 2 Apr 2012 00:38:41 +0400
From: Solar Designer <solar@...nwall.com>
To: john-dev@...ts.openwall.com
Subject: Re: fast hashes on GPU
On Sun, Apr 01, 2012 at 11:02:10PM +0300, Milen Rangelov wrote:
> Well, those are profiler stats from my sha256 and sha512 kernels:
>
> sha256 (using uint4 vectors):
>
> Used GPRs = 36
> ALU ops = 1654
>
> sha512 (using uint2 vectors):
>
> Used GPRs = 51
> ALU ops = 5283
Is this for AMD VLIW?
Do you limit this to uint2 because you can't afford 100+ GPRs?
Do you have similar stats for Nvidia?
If things are so bad in terms of register pressure anyway, maybe
bitslicing would be of help - at least we'll avoid the 64-bit rotates.
Alexander
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