[PATCH] D155406: [MemCpyOpt] implement multi BB stack-move optimization

[Kohei Asano via Phabricator via llvm-commits]

khei4 added a comment.

> Is it necessary to handle this for the PDT case, or can it not happen there? (Maybe all blocks get connected to the virtual exit block there?)

@nikic Thanks! It sounds like a good point! I couldn't follow completely, but I do believe so; DT's entry is PDT's leaves, so I guess we can calculate PDom if it's unreachable from entry, but I'll add the test for the case that contains a cycle unreachable from entry.


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