[PATCH] D154157: [LV] Cost model for out-of-loop reductions

[Anna Thomas via Phabricator via llvm-commits]

anna added a comment.

Thanks for testing the patch @dmgreen!

> I might regret mentioning this if it increases the costs, but should interleaved loops get an extra cost to account for reducing the vectors by UF, into a single vector that is then vec.reduced?

That's a good point, I think there is a higher chance of "touching a lot more cases" on vectorization :)  but it seems that can be done as a later patch, if needed?


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https://reviews.llvm.org/D154157