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Hi I am looking at some of the existing targets to try to understand more about writing a backend. I was a little puzzled by the use of a method ReplaceUses in *ISelDAGToDAG.cpp (*= most targets, e.g. ARM, X86..). I found its definition in the *GenDAGISel.inc file that is autogenerated from the target description. I can only assume TableGen emits this method definition for every traget.