[PATCH] D19507: LoadStoreVectorizer: Don't increase alignment with no align set

[Matt Arsenault via llvm-commits]

arsenm created this revision.
arsenm added reviewers: escha, resistor.
arsenm added a subscriber: llvm-commits.
Herald added a reviewer: tstellarAMD.
Herald added a subscriber: mzolotukhin.

If no alignment was set on the load/stores, it would vectorize
to the new type even though this increases the default alignment.

http://reviews.llvm.org/D19507

Files:
  lib/Transforms/Vectorize/LoadStoreVectorizer.cpp
  test/Transforms/LoadStoreVectorizer/AMDGPU/merge-stores-private.ll
  test/Transforms/LoadStoreVectorizer/AMDGPU/merge-stores.ll
  test/Transforms/LoadStoreVectorizer/AMDGPU/missing-alignment.ll

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