[PATCH] D30755: [LV] Refactor cross-iteration phi's back-patching; NFC

[Gil Rapaport via Phabricator via llvm-commits]

gilr created this revision.
Herald added a subscriber: mzolotukhin.

This patch refactors the PHisToFix loop as follows:

- The loop itself now resides in its own method.
- The new method iterates on scalar-loop's header; the PHIsToFix map formerly propagated as an output parameter and filled during phi widening is removed.
- The code handling reductions is moved into its own method, similar to the existing fixFirstOrderRecurrence().

Follows https://reviews.llvm.org/D28975 and its tentative breakdown.

Joint work with Ayal.


https://reviews.llvm.org/D30755

Files:
  lib/Transforms/Vectorize/LoopVectorize.cpp

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