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Date: Wed, 21 Dec 2016 11:41:28 -0500
From: Rik van Riel <>
Subject: Re: Re: HalfSipHash Acceptable Usage

On Wed, 2016-12-21 at 10:55 -0500, George Spelvin wrote:
> Actually, DJB just made a very relevant suggestion.
> As I've mentioned, the 32-bit performance problems are an x86-
> specific
> problem.  ARM does very well, and other processors aren't bad at all.
> SipHash fits very nicely (and runs very fast) in the MMX registers.
> They're 64 bits, and there are 8 of them, so the integer registers
> can
> be reserved for pointers and loop counters and all that.  And there's
> reference code available.
> How much does kernel_fpu_begin()/kernel_fpu_end() cost?

Those can be very expensive. Almost certainly not
worth it for small amounts of data.

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