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Date: Sun, 26 Jul 2015 16:02:19 +0200
From: Agnieszka Bielec <>
Subject: Re: PHC: Lyra2 vs yescrypt benchmarks 2

2015-07-26 15:58 GMT+02:00 Solar Designer <>:
> Agnieszka,
> On Sun, Jul 26, 2015 at 03:40:18PM +0200, Solar Designer wrote:
>> On Sun, Jul 26, 2015 at 03:15:43PM +0200, Agnieszka Bielec wrote:
>> > I was thinking that it uses AVX2 becaues Lyra2 uses
>> > blake2b which has some instructions in SSE4_1
>> Huh?!  Do you understand how SSE2, SSE4.1, AVX, and AVX2 correspond to
>> each other and in what ways they differ?  Can you please explain your
>> understanding to me, so that I see if it's correct or where exactly it
>> is wrong.  You sound confused pretty badly here.  Perhaps not enough
>> assembly output reading on your part. ;-)
> To clarify, I don't need a lot of detail from you - e.g., I am not
> asking you to list all extra instructions available with one of these
> that are not in another (although listing one or two particularly
> relevant instructions is OK).  I just need a few sentences summarizing the
> relationship and main differences between these SIMD instruction sets.

my undestranding was that when intrinsic are in SSE2 but AVX is
avalialbe they are compiled to AVX, and similarly SSE4 -> AVX2

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