[Haskell-cafe] Annoyed at System.Random

Vincent Hanquez tab at snarc.org
Fri May 4 16:20:49 CEST 2012

On 05/04/2012 02:33 PM, Ryan Newton wrote:
>         1. cprng-aes is painfully slow.
>     when using the haskell AES implementation yes. with AESNI it fly, and even
>     more when
>     i'll have time to chunk the generation to bigger blocks (says 128 AES
>     block at a time)
> One data-point -- in "intel-aes" I needed to do bigger blocks to get decent 
> performance.

Yes, it's a slightly random value here, although it's a tradeoff with memory 
usage and
performance, 128 blocks would do quite well compared to any haskell 
implementation that goes 1 block at a time [1]

[1] because you'll have to drop in/out of C, and reload the SSE registers each time.

>         2. It doesn't use NI instructions (or any C implementation, currently).
>     The NI instructions support are coming. and there's ton of already
>     existing C implementation
>     that could just be added.
> Oh, neat.  Could you share a pointer to some C code (with GCC aes intrinsics?) 
> that can replace what the ASM does in the "intel-aes" package?
Just have a look in cryptocipher with cbits/aes/x86ni.c


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