[LLVMdev] SLP vectorizer on AVX feature

[Hal Finkel]

----- Original Message -----
> From: "Renato Golin" <renato.golin at linaro.org>
> To: "Frank Winter" <fwinter at jlab.org>
> Cc: "LLVM Dev" <llvmdev at cs.uiuc.edu>
> Sent: Wednesday, July 1, 2015 3:29:25 PM
> Subject: Re: [LLVMdev] SLP vectorizer on AVX feature
> 
> On 1 July 2015 at 21:22, Frank Winter <fwinter at jlab.org> wrote:
> > there were two follow-up emails.
> 
> I only got one... weird...
> 
> 
> > The issue is solved. The SLP vectorizer has
> > a magic number built into the code which determines the max. vector
> > length
> > to search for. That was set to 128 bits. Increasing it to 256 bits
> > solved
> > the issue.
> 
> That looks like a simple fix. Is it upstream yet? :)

The main concern here, as noted in the bug report, is compile-time cost. We need to characterize that.

 -Hal

> 
> 
> > For inconsistency reasons it must be '--debug-only=SLP' and the
> > output can
> > be found in one of the follow-up emails.
> 
> Of course. Maybe we should mean "vectorize" as all of them? Anyway,
> that's unrelated.
> 
> cheers,
> --renato
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
> 

-- 
Hal Finkel
Assistant Computational Scientist
Leadership Computing Facility
Argonne National Laboratory