[llvm-dev] PSLP: Padded SLP Automatic Vectorization

David Chisnall via llvm-dev llvm-dev at lists.llvm.org
Tue Sep 29 05:37:39 PDT 2020

On 28/09/2020 15:45, Matt P. Dziubinski via llvm-dev wrote:
> Hey, I noticed this talk from the EuroLLVM 2015 
> (https://llvm.org/devmtg/2015-04/slides/pslp_slides_EUROLLVM2015.pdf) on 
> the PSLP vectorization algorithm (CGO 2015 paper: 
> http://vporpo.me/papers/pslp_cgo2015.pdf).
> Is anyone working on implementing it?
> If so, are there Phab reviews I can subscribe to?

The CGO paper was based on a very old LLVM and the last I heard, moving 
the transform to a newer LLVM and rerunning the benchmarks made the 
speedups go away.  It's not clear what the cause of this was and the 
team responsible didn't have the time to do any root cause analysis.


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