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Date: Mon, 2 Apr 2012 00:38:41 +0400
From: Solar Designer <>
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.


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