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-rw-r--r--include/llvm/Target/TargetLowering.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/llvm/Target/TargetLowering.h b/include/llvm/Target/TargetLowering.h
index c33d7df627..4f567b0b20 100644
--- a/include/llvm/Target/TargetLowering.h
+++ b/include/llvm/Target/TargetLowering.h
@@ -1440,6 +1440,9 @@ public:
// 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;