[PATCH] D23214: [MDA] Treat invariant.start as non-dependence

[Anna Thomas via llvm-commits]

anna created this revision.
anna added reviewers: sanjoy, reames, dberlin.
anna added a subscriber: llvm-commits.

Currently invariant.start intrinsic is treated as modifying memory. This
patch changes invariant.start to be treated as read-only memory operation by MDA.
This inturn helps passes such as GVN and memcpy optimizations to treat
invariant.start as non-clobbering.

https://reviews.llvm.org/D23214

Files:
  lib/Analysis/MemoryDependenceAnalysis.cpp
  test/Transforms/DeadStoreElimination/invariant.start.ll
  test/Transforms/GVN/invariant.start.ll
  test/Transforms/MemCpyOpt/invariant.start.ll

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