Index: lib/CodeGen/SelectionDAG/DAGCombiner.cpp
===================================================================
--- lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -14777,6 +14777,11 @@
   SmallVector<std::pair<StoreSDNode *, SDValue>, 8> BetterChains;
 
   for (StoreSDNode *ChainedStore : ChainedStores) {
+    // If ChainedStore has more than one value, we don't try replaceStoreChain.
+    // replaceStoreChain uses CombineTo, which only consider Chain only.
+    if (ChainedStore->getNumValues() != 1)
+      continue;
+
     SDValue Chain = ChainedStore->getChain();
     SDValue BetterChain = FindBetterChain(ChainedStore, Chain);