[llvm-dev] RV: A Unified Region Vectorizer for LLVM - now on github

[Hal Finkel via llvm-dev]

----- Original Message -----
> From: "Simon Moll via llvm-dev" <llvm-dev at lists.llvm.org>
> To: llvm-dev at lists.llvm.org
> Sent: Monday, November 21, 2016 2:35:50 AM
> Subject: [llvm-dev] RV: A Unified Region Vectorizer for LLVM - now on github
> 
> Hi LLVM developers,
> 
> The Region Vectorizer (RV) is now available on github
> https://github.com/simoll/rv
> 
> RV is a general-purpose vectorization framework for LLVM. It provides
> a
> unified interface to vectorize code regions, such as inner and outer
> loops, up to whole functions. Being a vectorization framework, RV is
> not
> another vectorization pass but rather enables users to vectorize IR
> directly from their own code.
> 
> I had a poster [1] and a lightning talk on RV at this year's US LLVM
> Developers' Meeting.
> 
> 
> We are hoping to upstream (parts of) RV eventually. As a first step I
> propose to optimize the if-conversion phase in LLVM's LoopVectorizer.
> RV
> features a capable vectorization analysis that finds out which
> branches
> in a vectorized region can stay despite the surrounding loop being
> vectorized. Those uniform branches do not need to be folded giving an
> immediate benefit over the complete if conversion LoopVectorizer is
> doing right now.
> 
> We will submit patches that integrate a stripped-down version of RV
> into
> the LoopVectorizer to make minimal if conversion work.

As I said in person at the dev meeting, this sounds like a good incremental step. I look forward to the patches.

 -Hal

> 
> Get in touch with me if you are interested in RV. We want to learn
> about
> new use cases and how RV could be improved. Finally, we welcome new
> developers to the project to work on new features or improve the
> existing codebase.
> 
> Regards,
> Simon
> 
> [1] "RV: A Unified Region Vectorizer for LLVM", Moll, S. (LLVM US
> DevMtg
> '16) (docs/poster_rv.pdf in the github repository)
> 
> 
> --
> 
> Simon Moll
> Researcher / PhD Student
> 
> Compiler Design Lab (Prof. Hack)
> Saarland University, Computer Science
> Building E1.3, Room 4.31
> 
> Tel. +49 (0)681 302-57521 : moll at cs.uni-saarland.de
> Fax. +49 (0)681 302-3065  :
> http://compilers.cs.uni-saarland.de/people/moll
> 
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> 

-- 
Hal Finkel
Lead, Compiler Technology and Programming Languages
Leadership Computing Facility
Argonne National Laboratory