[PATCH] D20932: [LV] Use vector vphis for more induction variables

[Michael Kuperstein via llvm-commits]

mkuper created this revision.
mkuper added reviewers: delena, wmi.
mkuper added subscribers: llvm-commits, Ayal, nadav, davidxl.
Herald added a subscriber: mzolotukhin.

Use a real vector IV for integer IVs that are the same type as the primary, and have a constant step - but are not necessarily the primary IV itself.

This is an expansion of http://reviews.llvm.org/rL271410

http://reviews.llvm.org/D20932

Files:
  lib/Transforms/Vectorize/LoopVectorize.cpp
  test/Transforms/LoopVectorize/induction.ll
  test/Transforms/LoopVectorize/reverse_induction.ll

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