Index: lib/CodeGen/SelectionDAG/DAGCombiner.cpp
===================================================================
--- lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -14667,6 +14667,10 @@
     if (Index->isVolatile() || Index->isIndexed())
       break;
 
+    // Skip stores with pre/post-inc.
+    if (St->getNumValues() > 1)
+      break;
+
     // Find the base pointer and offset for this memory node.
     BaseIndexOffset Ptr = BaseIndexOffset::match(Index->getBasePtr());
 
@@ -14681,6 +14685,11 @@
     SDNode *NextInChain = Index->getChain().getNode();
     while (true) {
       if (StoreSDNode *STn = dyn_cast<StoreSDNode>(NextInChain)) {
+        // Skip stores with pre/post-inc.
+        if (STn->getNumValues() > 1) {
+          Index = nullptr;
+          break;
+        }
         // We found a store node. Use it for the next iteration.
         ChainedStores.push_back(STn);
         Index = STn;