[PATCH] [OPENMP] llvm.loop.vectorize.enable metadata are lost after critical edge splitting
hfinkel at anl.gov
Tue Sep 30 14:37:25 PDT 2014
----- Original Message -----
> From: "Andrew Trick" <atrick at apple.com>
> To: "zinovy nis" <zinovy.nis at gmail.com>, chandlerc at gmail.com, atrick at apple.com
> Cc: llvm-commits at cs.uiuc.edu
> Sent: Tuesday, September 30, 2014 4:29:08 PM
> Subject: Re: [PATCH] [OPENMP] llvm.loop.vectorize.enable metadata are lost after critical edge splitting
> Is it incorrect to leave the loop metadata on the original branch
> when splitting the edge?
> GVN already requires DomTree, so no change to the pipeline is needed
> if you use it.
> In splitCriticalEdges, if LoopInfo is available you can use it.
> Otherwise you can use the DomTree. If the DomTree check fails (ie.
> both targets dominate the latch) then just invalidate the metadata.
> I think there is a fundamental problem with the metadata design--it's
> ridiculous to assume that any pass that splits critical edges has
> LoopInfo--but that should at least workaround your problem.
Is that a flaw in the design of the metadata, or just in the fact that the utility functions used to manipulate the metadata are part of LoopInfo?
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Assistant Computational Scientist
Leadership Computing Facility
Argonne National Laboratory
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