[PATCH] D85283: [ARM][CostModel] Implement getCFInstrCost

[Sam Parker via Phabricator via llvm-commits]

samparker added a comment.

> Do you mean it's the cost of a phi that is altering things?

I believe so, since I figure there's plenty more of them than branches and returns that would affect the vectorizer. I think register usages should still represent some cost, because they are important physical resources, but I suspect that the vectorizer is taking the scalar cost and multiplying it by the vector factor, even though we're likely to still only use a single register.


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