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by jdoerfert 2389 days ago
It would be news to me that the PolyhedralInfo interface is actually used anywhere. As the file comment says, this was "work in progress" a few years ago and it shares the same drawbacks as Polly (unfortunately).

Polyhedral development in LLVM stagnated a while ago, maybe we find the people and time to actually land the PolyhedralValueInfo (see for example this talk: https://www.youtube.com/watch?v=xSA0XLYJ-G0).
1 comments
Cladode 2388 days ago
Albert Cohen from Google gave a really good lecture on polyhedral compilation in the real world at PLISS [1] this year: slides [2], lecture videos [3, 4].

A core problem of the polyhedral approach, is that the thing that makes it so appealing (it being expressive enough to enable the many interesting program transformations), is costly for large programs making, the overall optimisation process and hence the compiler hard to scale. Naturally, this difficulty makes for interesting research problems.

[1] https://pliss.org/

[2] https://pliss2019.github.io/albert_cohen_slides.pdf

[3] https://www.youtube.com/watch?v=mt6pIpt5Wk0

[4] https://www.youtube.com/watch?v=3TNT5rFVTUY

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