Index: include/llvm/IR/Intrinsics.td
===================================================================
--- include/llvm/IR/Intrinsics.td
+++ include/llvm/IR/Intrinsics.td
@@ -54,6 +54,12 @@
   int ArgNo = argNo;
 }
 
+// Returned - The specified argument is always the return value of the
+// intrinsic.
+class Returned<int argNo> : IntrinsicProperty {
+  int ArgNo = argNo;
+}
+
 // ReadOnly - The specified argument pointer is not written to through the
 // pointer by the intrinsic.
 class ReadOnly<int argNo> : IntrinsicProperty {
Index: utils/TableGen/CodeGenIntrinsics.h
===================================================================
--- utils/TableGen/CodeGenIntrinsics.h
+++ utils/TableGen/CodeGenIntrinsics.h
@@ -111,6 +111,7 @@
 
     enum ArgAttribute {
       NoCapture,
+      Returned,
       ReadOnly,
       WriteOnly,
       ReadNone
Index: utils/TableGen/CodeGenTarget.cpp
===================================================================
--- utils/TableGen/CodeGenTarget.cpp
+++ utils/TableGen/CodeGenTarget.cpp
@@ -592,6 +592,9 @@
     else if (Property->isSubClassOf("NoCapture")) {
       unsigned ArgNo = Property->getValueAsInt("ArgNo");
       ArgumentAttributes.push_back(std::make_pair(ArgNo, NoCapture));
+    } else if (Property->isSubClassOf("Returned")) {
+      unsigned ArgNo = Property->getValueAsInt("ArgNo");
+      ArgumentAttributes.push_back(std::make_pair(ArgNo, Returned));
     } else if (Property->isSubClassOf("ReadOnly")) {
       unsigned ArgNo = Property->getValueAsInt("ArgNo");
       ArgumentAttributes.push_back(std::make_pair(ArgNo, ReadOnly));
Index: utils/TableGen/IntrinsicEmitter.cpp
===================================================================
--- utils/TableGen/IntrinsicEmitter.cpp
+++ utils/TableGen/IntrinsicEmitter.cpp
@@ -548,6 +548,12 @@
             OS << "Attribute::NoCapture";
             addComma = true;
             break;
+          case CodeGenIntrinsic::Returned:
+            if (addComma)
+              OS << ",";
+            OS << "Attribute::Returned";
+            addComma = true;
+            break;
           case CodeGenIntrinsic::ReadOnly:
             if (addComma)
               OS << ",";