diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index e5122abd4ba..5d495a68eda 100644
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -18237,3 +18237,19 @@ unsigned X86VectorTargetTransformInfo::getCastInstrCost(unsigned Opcode,
   return VectorTargetTransformImpl::getCastInstrCost(Opcode, Dst, Src);
 }
 
+
+unsigned X86VectorTargetTransformInfo::getShuffleCost(ShuffleKind Kind, Type *Tp,
+                                                      int Index) const {
+  // We only estimate the cost of reverse shuffles.
+  if (Kind != Reverse)
+    return VectorTargetTransformImpl::getShuffleCost(Kind, Tp, Index);
+
+  std::pair<unsigned, MVT> LT = getTypeLegalizationCost(Tp);
+  unsigned Cost = 1;
+  if (LT.second.getSizeInBits() > 128)
+    Cost = 3; // Extract + insert + copy.
+
+  // Multiple by the number of parts.
+  return Cost * LT.first;
+}
+
diff --git a/lib/Target/X86/X86ISelLowering.h b/lib/Target/X86/X86ISelLowering.h
index 1a696a8f536..1b4b5eb65da 100644
--- a/lib/Target/X86/X86ISelLowering.h
+++ b/lib/Target/X86/X86ISelLowering.h
@@ -973,6 +973,8 @@ namespace llvm {
 
     virtual unsigned getCastInstrCost(unsigned Opcode, Type *Dst,
                                       Type *Src) const;
+
+    unsigned getShuffleCost(ShuffleKind Kind, Type *Tp, int Index) const;
   };
 }