[PATCH] [LoopInterchange] Add support to interchange loops with reductions.

[Renato Golin]

In http://reviews.llvm.org/D8314#145073, @karthikthecool wrote:

> Sure. The functions currently duplicated are - isReductionPHI and helper functions and isInductionPHI. Is it ok to move them to somewhere like LoopBase. Loop can expose an API to check if a variable is induction/reduction in the loop? It can be reused by other modules in this case.


Karthik,

Can you try and refactor those two functions to be generic and make both loop vectorizer and interchange to use it?

cheers,
--renato


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