[LLVMdev] Limit loop vectorizer to SSE

[Frank Winter]

On 12/11/13 11:01, Renato Golin wrote:
> On 12 November 2013 15:53, Frank Winter <fwinter at jlab.org 
> <mailto:fwinter at jlab.org>> wrote:
>
>     .. forcing the vector size to 4 does not prevent using AVX.
>
>
> Sure. That's more for tests than anything else.
>
> So, there are ways of disabling stuf in Clang, for instance 
> "-mattr=-avx" or "-target-feature -avx", but I'm not sure how you're 
> doing it in the JIT. I'm also not sure how to set target parameters in 
> JIT, you'll have to do that by hand.
>
I don't know that either. I set the CPU via

engineBuilder.setMCPU(llvm::sys::getHostCPUName());

and that figures out all target parameters, I assume.
I would need to still use this, and then disable just the AVX feature.

> cheers,
> --renato


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