Add a new API for Nate
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23131 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
index b47002f..dab757e 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
@@ -228,6 +228,33 @@
delete N;
}
+void SelectionDAG::DeleteNode(SDNode *N) {
+ assert(N->use_empty() && "Cannot delete a node that is not dead!");
+
+ // First take this out of the appropriate CSE map.
+ RemoveNodeFromCSEMaps(N);
+
+ // Remove it from the AllNodes list.
+ for (std::vector<SDNode*>::iterator I = AllNodes.begin(); ; ++I) {
+ assert(I != AllNodes.end() && "Node not in AllNodes list??");
+ if (*I == N) {
+ // Erase from the vector, which is not ordered.
+ std::swap(*I, AllNodes.back());
+ AllNodes.pop_back();
+ break;
+ }
+ }
+
+ // Drop all of the operands and decrement used nodes use counts.
+ while (!N->Operands.empty()) {
+ SDNode *O = N->Operands.back().Val;
+ N->Operands.pop_back();
+ O->removeUser(N);
+ }
+
+ delete N;
+}
+
/// RemoveNodeFromCSEMaps - Take the specified node out of the CSE map that
/// correspond to it. This is useful when we're about to delete or repurpose
/// the node. We don't want future request for structurally identical nodes