diff --git a/llvm/include/llvm/Support/Casting.h b/llvm/include/llvm/Support/Casting.h
--- a/llvm/include/llvm/Support/Casting.h
+++ b/llvm/include/llvm/Support/Casting.h
@@ -353,9 +353,9 @@
   static inline CastResultType castFailed() { return CastResultType(nullptr); }
 
   static inline CastResultType doCastIfPossible(std::unique_ptr<From> &&f) {
-    if (!Self::isPossible(f))
+    if (!Self::isPossible(f.get()))
       return castFailed();
-    return doCast(f);
+    return doCast(std::forward<std::unique_ptr<From> &&>(f));
   }
 };