[LLVMdev] function pass to visit BB bottom-up order

[Ananth Durbha]

Hello llvmdevs,

In a function pass, I need to visit all the basic blocks in bottom-up order (the exact opposite of ReversePostOrderTraversal). I noticed some APIs like po_iterator but wasn't able to figure out an example usage for this on web. Any pointers/suggestions are highly appreciated.

Thanks,
Ananth
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