2010-08-21

izard: (Default)
2010-08-21 05:27 pm
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Integer AVX

It is a well known fact that AVX only supports floating point (single and double precision and scalar) operations in SNB u-arch CPUs family.

However some don't realize that all YMM register permutation functions and logical functions (XOR, ANDNOT, OR) can be used over integers, stored in 256 bit SIMD registers. This is enough to implements some of crypto routines, especially in bit-sliced case, in AVX, practically doubling the throughput.
izard: (Default)
2010-08-21 05:49 pm
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Trip report: Amberg

This week I've been to Amberg, had some meetings there. It's a nice town, very old one with plenty of sights to see, but I only had exactly 10 minutes to see them all :(.
Gothic town hall, built in 14th century.

I probably misunderstand what "gothic" means, this building does not look Gothic at all for me.
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