Index: clang/include/clang/Basic/Builtins.def
===================================================================
--- clang/include/clang/Basic/Builtins.def
+++ clang/include/clang/Basic/Builtins.def
@@ -322,6 +322,7 @@
 BUILTIN(__builtin_lroundf128, "LiLLd", "Fne")
 BUILTIN(__builtin_nearbyint , "dd", "Fnc")
 BUILTIN(__builtin_nearbyintf, "ff", "Fnc")
+BUILTIN(__builtin_nearbyintf16, "hh"  , "Fnc")
 BUILTIN(__builtin_nearbyintl, "LdLd", "Fnc")
 BUILTIN(__builtin_nearbyintf128, "LLdLLd", "Fnc")
 BUILTIN(__builtin_nextafter , "ddd", "Fne")
Index: clang/lib/CodeGen/CGBuiltin.cpp
===================================================================
--- clang/lib/CodeGen/CGBuiltin.cpp
+++ clang/lib/CodeGen/CGBuiltin.cpp
@@ -2419,6 +2419,7 @@
     case Builtin::BInearbyintl:
     case Builtin::BI__builtin_nearbyint:
     case Builtin::BI__builtin_nearbyintf:
+    case Builtin::BI__builtin_nearbyintf16:
     case Builtin::BI__builtin_nearbyintl:
     case Builtin::BI__builtin_nearbyintf128:
       return RValue::get(emitUnaryMaybeConstrainedFPBuiltin(*this, E,