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ikmn_j_
Beginner
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I am trying to vectorise

Hi

I am trying to vectorise code that is using mainly integer instructions (add,rol,xor). I cannot get the compiler to vectorise this.

My understanding is there is no vector version of rol. Will this be supported in the future?

I have tried on Westmere, Sandy Bridge and Haswell with both SSE and AVX. In AVX the rol is repalced by shld, but there is no gain.

I seem to be able to get the code to unroll, but no vector instructions are inserted (according to disassembler). There is a slight speedup (~10%), but I believe this is due to better use of multiple ALUs; from more independent instructions.

Any guidance would be welcome.

Thanks

 

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jimdempseyatthecove
Black Belt
67 Views

Can you repost a code sample in English?

Note << is not rol

Jim Dempsey

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