[llvm] r177465 - Propagate DAG node ordering during type legalization and instruction selection

[Owen Anderson]

On Mar 19, 2013, at 5:10 PM, Justin Holewinski <jholewinski at nvidia.com> wrote:

> A node's ordering is only propagated during legalization if (a) the new node does
> not have an ordering (is not a CSE'd node), or (b) the new node has an ordering
> that is higher than the node being legalized.

I think you need to apply the same exceptions during instruction selection as well.  Implicit CSE happens during all phases of SelectionDAG.  The simplest solution might be to move the code that handles these cases into the add() method on the node ordering object.

--Owen
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