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AVX2

Author: Agner

Date: 2011-06-23 11:35

Thanks for the reference. I always expected that there would be an AVX2 with 256 bit integer vector instructions.

The most surprising extension is the VGATHER.. instructions that allow vectorized table-lookup. Lookup tables have always been an obstackle to vectorization. I wonder how efficient it will be, though. The performance will still be limited by the number of address-generation units and read ports in the CPU.

The physical random number generator instruction (RDRAND) has been announced previously. It is strongly needed for cryptographic and security applications. The VIA processors have had such an instruction for years now.

I will update my "objconv" disassembler with the new instructions when I get the time.

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