[PATCH] D55120: [MemCpyOpt] memset->memcpy forwarding with undef tail

[Nikita Popov via Phabricator via llvm-commits]

nikic updated this revision to Diff 177213.
nikic added a comment.

Conversatively return ModRef for volatile memsets. Add a few more tests.

Forwarding happens for the case of volatile memset + non-volatile memcpy and doesn't for non-volatile memset + volatile memcpy, which I *think* is correct. (In either case this is existing behavior, this patch doesn't change it.)


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D55120/new/

https://reviews.llvm.org/D55120

Files:
  lib/Analysis/MemoryDependenceAnalysis.cpp
  lib/Transforms/Scalar/MemCpyOptimizer.cpp
  test/Transforms/MemCpyOpt/memset-memcpy-oversized.ll

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