diff --git a/llvm/lib/CodeGen/SelectionDAG/FastISel.cpp b/llvm/lib/CodeGen/SelectionDAG/FastISel.cpp
index 1d961af..d25ea4e 100644
--- a/llvm/lib/CodeGen/SelectionDAG/FastISel.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/FastISel.cpp
@@ -2183,6 +2183,8 @@
 
   bool IsNonTemporal = I->getMetadata(LLVMContext::MD_nontemporal) != nullptr;
   bool IsInvariant = I->getMetadata(LLVMContext::MD_invariant_load) != nullptr;
+  bool IsDereferenceable =
+      I->getMetadata(LLVMContext::MD_dereferenceable) != nullptr;
   const MDNode *Ranges = I->getMetadata(LLVMContext::MD_range);
 
   AAMDNodes AAInfo;
@@ -2197,6 +2199,8 @@
     Flags |= MachineMemOperand::MOVolatile;
   if (IsNonTemporal)
     Flags |= MachineMemOperand::MONonTemporal;
+  if (IsDereferenceable)
+    Flags |= MachineMemOperand::MODereferenceable;
   if (IsInvariant)
     Flags |= MachineMemOperand::MOInvariant;