[PATCH] D45208: [LoopInterchange] Make isProfitableForVectorization slightly more conservative.

[Florian Hahn via Phabricator via llvm-commits]

fhahn created this revision.
fhahn added reviewers: efriedma, mcrosier, karthikthecool, blitz.opensource.

After https://reviews.llvm.org/D43236, we started interchanging loops with empty dependence
matrices.  In isProfitableForVectorization, we try to determine if
interchanging makes the loop dependences more friendly to the
vectorizer. If there are no dependences, we should not interchange,
based on that heuristic.


https://reviews.llvm.org/D45208

Files:
  lib/Transforms/Scalar/LoopInterchange.cpp
  test/Transforms/LoopInterchange/interchange-no-deps.ll

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