Re: [PATCH] crypto: twofish - add x86_64/avx assemblerimplementation

[Jussi Kivilinna]

Quoting Johannes Goetzfried  
<Johannes.Goetzfried@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>:

> This patch adds a x86_64/avx assembler implementation of the Twofish block
> cipher. The implementation processes eight blocks in parallel (two 4 block
> chunk AVX operations). The table-lookups are done in general-purpose  
> registers.
> For small blocksizes the 3way-parallel functions from the twofish-x86_64-3way
> module are called. A good performance increase is provided for blocksizes
> greater or equal to 128B.
>
> Patch has been tested with tcrypt and automated filesystem tests.

It would be benefical to expand the twofish vectors in  
crypto/testmgr.h from 3 blocks
to 8 blocks so that 8-way algorithm(s) can be checked runtime. And  
while at expanding
test-vectors, why not just expand to 16 blocks... AVX2 is just one year away:
  
https://github.com/jkivilin/crypto-avx2/commit/1a72d7a6a1553aee70ad4b6a1980ca372181f40d

> Tcrypt benchmark results:
>
> Intel Core i5-2500 CPU (fam:6, model:42, step:7)

<snip>

> +/*
> + * Glue Code for AVX assembler version of Twofish Cipher
> + *
> + * Copyright (C) 2012 Johannes Goetzfried
> + *     <Johannes.Goetzfried@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
> + *
> + * Glue code based on twofish_sse2_glue.c by:
> + *  Copyright (C) 2011 Jussi Kivilinna <jussi.kivilinna@xxxxxxxx>

I think you mean serpent_sse2_glue.c :)

-Jussi


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