diff --git a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
index f03a2a9..ba14a4d 100644
--- a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -7722,7 +7722,12 @@
   unsigned LastLegalVectorType = 0;
   unsigned LastLegalIntegerType = 0;
   StartAddress = LoadNodes[0].OffsetFromBase;
-  for (unsigned i=1; i<LoadNodes.size(); ++i) {
+  SDValue FirstChain = LoadNodes[0].MemNode->getChain();
+  for (unsigned i = 1; i < LoadNodes.size(); ++i) {
+    // All loads much share the same chain.
+    if (LoadNodes[i].MemNode->getChain() != FirstChain)
+      break;
+    
     int64_t CurrAddress = LoadNodes[i].OffsetFromBase;
     if (CurrAddress - StartAddress != (ElementSizeBytes * i))
       break;
@@ -7791,16 +7796,23 @@
                                   FirstInChain->getPointerInfo(), false, false,
                                   FirstInChain->getAlignment());
 
-  // Replace the first store with the new store
-  CombineTo(EarliestOp, NewStore);
-  // Erase all other stores.
-  for (unsigned i = 0; i < NumElem ; ++i) {
+  // Replace one of the loads with the new load.
+  LoadSDNode *Ld = cast<LoadSDNode>(LoadNodes[0].MemNode);
+  DAG.ReplaceAllUsesOfValueWith(SDValue(Ld, 1),
+                                SDValue(NewLoad.getNode(), 1));
+
+  // Remove the rest of the load chains.
+  for (unsigned i = 1; i < NumElem ; ++i) {
     // Replace all chain users of the old load nodes with the chain of the new
     // load node.
     LoadSDNode *Ld = cast<LoadSDNode>(LoadNodes[i].MemNode);
-    DAG.ReplaceAllUsesOfValueWith(SDValue(Ld, 1),
-                                  SDValue(NewLoad.getNode(), 1));
+    DAG.ReplaceAllUsesOfValueWith(SDValue(Ld, 1), Ld->getChain());
+  }
 
+  // Replace the first store with the new store.
+  CombineTo(EarliestOp, NewStore);
+  // Erase all other stores.
+  for (unsigned i = 0; i < NumElem ; ++i) {
     // Remove all Store nodes.
     if (StoreNodes[i].MemNode == EarliestOp)
       continue;
diff --git a/test/CodeGen/X86/2012-10-03-DAGCycle.ll b/test/CodeGen/X86/2012-10-03-DAGCycle.ll
new file mode 100644
index 0000000..72083c7
--- /dev/null
+++ b/test/CodeGen/X86/2012-10-03-DAGCycle.ll
@@ -0,0 +1,31 @@
+; RUN: llc -mtriple=x86_64-apple-macosx -mcpu=corei7 < %s
+
+target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
+target triple = "x86_64-apple-macosx10.8.0"
+
+%struct.pluto.0 = type { %struct.bar.1, %struct.hoge.368* }
+%struct.bar.1 = type { %i8* }
+%i8 = type { i8 }
+%struct.hoge.368 = type { i32, i32 }
+%struct.widget.375 = type { i32, i32, %i8*, %struct.hoge.368* }
+
+define fastcc void @bar(%struct.pluto.0* %arg) nounwind uwtable ssp align 2 {
+bb:
+  %tmp1 = alloca %struct.widget.375, align 8
+  %tmp2 = getelementptr inbounds %struct.pluto.0* %arg, i64 0, i32 1
+  %tmp3 = load %struct.hoge.368** %tmp2, align 8
+  store %struct.pluto.0* %arg, %struct.pluto.0** undef, align 8
+  %tmp = getelementptr inbounds %struct.widget.375* %tmp1, i64 0, i32 2
+  %tmp4 = getelementptr %struct.pluto.0* %arg, i64 0, i32 0, i32 0
+  %tmp5 = load %i8** %tmp4, align 8
+  store %i8* %tmp5, %i8** %tmp, align 8
+  %tmp6 = getelementptr inbounds %struct.widget.375* %tmp1, i64 0, i32 3
+  store %struct.hoge.368* %tmp3, %struct.hoge.368** %tmp6, align 8
+  br i1 undef, label %bb8, label %bb7
+
+bb7:                                              ; preds = %bb
+  unreachable
+
+bb8:                                              ; preds = %bb
+  unreachable
+}