1 files changed, 7 insertions, 3 deletions
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
index 8569e0c45b..6d4562dfed 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
@@ -150,16 +150,20 @@ namespace llvm {
 }
 
 // EmitInstrWithCustomInserter - This method should be implemented by targets
-// that mark instructions with the 'usesCustomDAGSchedInserter' flag.  These
+// that mark instructions with the 'usesCustomInserter' flag.  These
 // 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.
+// basic blocks, and this method is called to expand it into a sequence of
+// instructions, potentially also creating new basic blocks and control flow.
+// 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.
 MachineBasicBlock *TargetLowering::EmitInstrWithCustomInserter(MachineInstr *MI,
                                                          MachineBasicBlock *MBB,
                    DenseMap<MachineBasicBlock*, MachineBasicBlock*> *EM) const {
 #ifndef NDEBUG
   errs() << "If a target marks an instruction with "
-          "'usesCustomDAGSchedInserter', it must implement "
+          "'usesCustomInserter', it must implement "
           "TargetLowering::EmitInstrWithCustomInserter!";
 #endif
   llvm_unreachable(0);