[PATCH] D16950: Compute live-in for MemorySSA

[Daniel Berlin via llvm-commits]

dberlin created this revision.
dberlin added reviewers: reames, hfinkel.
dberlin added subscribers: llvm-commits, george.burgess.iv.

While working on some unit tests for an optimization, i discovered some cases where live-in computation eliminations useless phis for MemorySSA.
The calculation is cheap, and we can always disable it later, so enable it for now.

http://reviews.llvm.org/D16950

Files:
  lib/Transforms/Utils/MemorySSA.cpp
  test/Transforms/Util/MemorySSA/livein.ll

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