[DAG] Cleanup unused nodes after store merge. NFCI.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@310648 91177308-0d34-0410-b5e6-96231b3b80d8

Author: niravhdave

lib/CodeGen/SelectionDAG/DAGCombiner.cpp

@@ -12552,8 +12552,15 @@ bool DAGCombiner::MergeStoresOfConstantsOrVecElts(
  }
 
  // Replace all merged stores with the new store.
- for (unsigned i = 0; i < NumStores; ++i)
+ for (unsigned i = 0; i < NumStores; ++i) {
+ SDValue Val = StoreNodes[i].MemNode->getOperand(1);
+ SDValue Addr = StoreNodes[i].MemNode->getOperand(2);
  CombineTo(StoreNodes[i].MemNode, NewStore);
+ if (Val.getNode()->use_empty())
+ recursivelyDeleteUnusedNodes(Val.getNode());
+ if (Addr.getNode()->use_empty())
+ recursivelyDeleteUnusedNodes(Addr.getNode());
+ }
 
  AddToWorklist(NewChain.getNode());
  return true;
@@ -13186,9 +13193,12 @@ bool DAGCombiner::MergeConsecutiveStores(StoreSDNode *St) {
  // corresponding value if its no longer used.
  for (unsigned i = 0; i < NumElem; ++i) {
  SDValue Val = StoreNodes[i].MemNode->getOperand(1);
+ SDValue Addr = StoreNodes[i].MemNode->getOperand(2);
  CombineTo(StoreNodes[i].MemNode, NewStore);
  if (Val.getNode()->use_empty())
  recursivelyDeleteUnusedNodes(Val.getNode());
+ if (Addr.getNode()->use_empty())
+ recursivelyDeleteUnusedNodes(Addr.getNode());
  }
 
  RV = true;