Bardia Mahjour via llvm-dev
2019-Sep-25 17:14 UTC
[llvm-dev] Loop Opt WG Meeting Minutes for Sep 25, 2019
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Wed, Sep 25, 2019:
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Presentation from Marc Moreno Maza about his work on delinearization.
- Slides attached.
- Issues with the DomTreeUpdater (Kit):
- The direction going forward is to use the updater (instead of manual
changes to the tree).
- Other people have run into nasty bugs with it (in edge cases). Reviews
are available for patches to the uses of DomTreeUpdater.
- No documentation on how to (how not to) use the updater other than
the comments in the source.
- The updater uses a heuristic to decide to rebuild the entire tree
instead of updating it.
- Kit to work with Nicole to investigate if more obvious bugs are
exposed by turning off the heuristic.
- Status Updates
- Data Dependence Graph (Bardia)
- https://reviews.llvm.org/D65350 - Done.
- https://reviews.llvm.org/D67970 - Ready for Review
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Tentative Agenda for Oct 9th
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Introducing Concept of Perfect Loop Nest in LLVM (Ettore)
- Status Updates
- DomTreeUpdater investigation (Kit)
- Data Dependence Graph (Bardia)
- https://reviews.llvm.org/D67970
- Follow up on multi-dimensional array indexing RFC (Siddharth)
- Impact of Loop Rotation on existing passes (Min-Yih)
- Bugzilla bugs update (Vivek)
- Others?
(See attached file:
On_the_delinearization_of_array_references_in_for_loop_nests.pdf)
Bardia Mahjour
Compiler Optimizations
IBM Toronto Software Lab
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