llvm dev - Apr 2013 - [LLVMdev] Difference between vector and scalar legalization

Is there a reason VectorLegalizer::Run() and
SelectionDAGLegalize::LegalizeDAG() visit the DAG nodes in a different
order? The former traverses the DAG from top to bottom (users legalized
after all their uses are legalized) and the latter traverses the DAG in the
opposite order.

I am finding it hard to write code for vector node legalization in some
cases and wondering whether there is an option to reverse the order.
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