// instructions are special in various ways, which require special support to
// insert. The specified MachineInstr is created but not inserted into any
// basic blocks, and the scheduler passes ownership of it to this method.
+ // When new basic blocks are inserted and the edges from MBB to its successors
+ // are modified, the method should insert pairs of <OldSucc, NewSucc> into the
+ // DenseMap.
virtual MachineBasicBlock *EmitInstrWithCustomInserter(MachineInstr *MI,
MachineBasicBlock *MBB,
DenseMap<MachineBasicBlock*, MachineBasicBlock*> *EM) const;