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Date: Thu, 15 Dec 2016 22:09:16 +0100
From: Hannes Frederic Sowa <hannes@...essinduktion.org>
To: Peter Zijlstra <peterz@...radead.org>,
"Jason A. Donenfeld" <Jason@...c4.com>
Cc: David Laight <David.Laight@...lab.com>, Netdev <netdev@...r.kernel.org>,
"kernel-hardening@...ts.openwall.com" <kernel-hardening@...ts.openwall.com>,
Jean-Philippe Aumasson <jeanphilippe.aumasson@...il.com>,
LKML <linux-kernel@...r.kernel.org>,
Linux Crypto Mailing List <linux-crypto@...r.kernel.org>,
"Daniel J . Bernstein" <djb@...yp.to>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Eric Biggers <ebiggers3@...il.com>
Subject: Re: [PATCH v2 1/4] siphash: add cryptographically secure hashtable
function
On 15.12.2016 22:04, Peter Zijlstra wrote:
> On Thu, Dec 15, 2016 at 09:43:04PM +0100, Jason A. Donenfeld wrote:
>> On Thu, Dec 15, 2016 at 9:31 PM, Hannes Frederic Sowa
>> <hannes@...essinduktion.org> wrote:
>>> ARM64 and x86-64 have memory operations that are not vector operations
>>> that operate on 128 bit memory.
>>
>> Fair enough. imull I guess.
>
> imull is into rdx:rax, not memory. I suspect he's talking about
> cmpxchg16b.
Exactly and I think I saw a ll/sc 128 bit on armv8 to atomically
manipulate linked lists.
Bye,
Hannes
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