doing the wrong thing.
//===---------------------------------------------------------------------===//
+
+It would be really nice to be able to write patterns in .td files for copies,
+which would eliminate a bunch of explicit predicates on them (e.g. no side
+effects). Once this is in place, it would be even better to have tblgen
+synthesize the various copy insertion/inspection methods in TargetInstrInfo.
+
+//===---------------------------------------------------------------------===//