[LLVMdev] SLP vectorizer on AVX feature (original) (raw)

Renato Golin renato.golin at linaro.org
Wed Jul 1 13:59:26 PDT 2015

On 1 July 2015 at 20:18, Frank Winter <fwinter at jlab.org> wrote:

Also, in a earlier version of my application I saw on similar functions that the SLP vectorizer uses 8xfloat on the same hardward (Sandy Bridge). In those versions I used LLVM 3.4 or 3.5 (trunk).

In those days, SLP was a lot more aggressive, maybe? :)

You could use OpenMP vectorize pragmas to specify the width of that loop, which works across compilers. I'm not sure SLP checks that, though.

cheers, --renato

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