[LLVMdev] Proposal for new Legalization framework

[Tim Northover]

> To me, the expanding of regular IR will achieve nearly the same result as
> building a lower level IR.

Remember that we basically already have a lower level IR consisting of
basic blocks of MachineInstrs at the moment.To an extent this has
already proven itself capable of modelling targets, and making it a
first-class IR might be a reasonable amount of work (certainly easier
than SelectionDAG).

Cheers.

Tim.