1 files changed, 38 insertions, 4 deletions
diff --git a/lib/Analysis/ObjCARCInstKind.cpp b/lib/Analysis/ObjCARCInstKind.cpp
index 31c432711834..0e96c6e975c9 100644
--- a/lib/Analysis/ObjCARCInstKind.cpp
+++ b/lib/Analysis/ObjCARCInstKind.cpp
@@ -1,9 +1,8 @@
 //===- ARCInstKind.cpp - ObjC ARC Optimization ----------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 /// \file
@@ -482,6 +481,41 @@ bool llvm::objcarc::IsNoopOnNull(ARCInstKind Class) {
   llvm_unreachable("covered switch isn't covered?");
 }
 
+/// Test if the given class represents instructions which do nothing if
+/// passed a global variable.
+bool llvm::objcarc::IsNoopOnGlobal(ARCInstKind Class) {
+  switch (Class) {
+  case ARCInstKind::Retain:
+  case ARCInstKind::RetainRV:
+  case ARCInstKind::ClaimRV:
+  case ARCInstKind::Release:
+  case ARCInstKind::Autorelease:
+  case ARCInstKind::AutoreleaseRV:
+  case ARCInstKind::RetainBlock:
+  case ARCInstKind::FusedRetainAutorelease:
+  case ARCInstKind::FusedRetainAutoreleaseRV:
+    return true;
+  case ARCInstKind::AutoreleasepoolPush:
+  case ARCInstKind::AutoreleasepoolPop:
+  case ARCInstKind::LoadWeakRetained:
+  case ARCInstKind::StoreWeak:
+  case ARCInstKind::InitWeak:
+  case ARCInstKind::LoadWeak:
+  case ARCInstKind::MoveWeak:
+  case ARCInstKind::CopyWeak:
+  case ARCInstKind::DestroyWeak:
+  case ARCInstKind::StoreStrong:
+  case ARCInstKind::IntrinsicUser:
+  case ARCInstKind::CallOrUser:
+  case ARCInstKind::Call:
+  case ARCInstKind::User:
+  case ARCInstKind::None:
+  case ARCInstKind::NoopCast:
+    return false;
+  }
+  llvm_unreachable("covered switch isn't covered?");
+}
+
 /// Test if the given class represents instructions which are always safe
 /// to mark with the "tail" keyword.
 bool llvm::objcarc::IsAlwaysTail(ARCInstKind Class) {