Rename usesCustomDAGSchedInserter to usesCustomInserter, and update a

bunch of associated comments, because it doesn't have anything to do
with DAGs or scheduling. This is another step in decoupling MachineInstr
emitting from scheduling.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85517 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 8 insertions, 4 deletions

diff --git a/lib/CodeGen/SelectionDAG/InstrEmitter.cpp b/lib/CodeGen/SelectionDAG/InstrEmitter.cpp
index 425f670763..53bebbb44c 100644
--- a/lib/CodeGen/SelectionDAG/InstrEmitter.cpp
+++ b/lib/CodeGen/SelectionDAG/InstrEmitter.cpp
@@ -556,7 +556,7 @@ void InstrEmitter::EmitNode(SDNode *Node, bool IsClone, bool IsCloned,
     MI->setMemRefs(cast<MachineSDNode>(Node)->memoperands_begin(),
                    cast<MachineSDNode>(Node)->memoperands_end());
 
-    if (II.usesCustomDAGSchedInsertionHook()) {
+    if (II.usesCustomInsertionHook()) {
       // Insert this instruction into the basic block using a target
       // specific inserter which may returns a new basic block.
       MBB = TLI->EmitInstrWithCustomInserter(MI, MBB, EM);
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);