From 9d6055133b223d465da2555e06b50ee127ef4f4e Mon Sep 17 00:00:00 2001
From: Pete Cooper <peter_cooper@apple.com>
Date: Thu, 10 Nov 2011 21:45:06 +0000
Subject: [PATCH] Add invariant.load metadata to loads from selector
 references.  Allows these loads to later be moved/combined in the optimizer. 
 Fixes <rdar://problem/6027699>

llvm-svn: 144318
---
 clang/lib/CodeGen/CGObjCMac.cpp                  | 7 ++++++-
 clang/test/CodeGenObjC/selector-ref-invariance.m | 9 +++++++++
 2 files changed, 15 insertions(+), 1 deletion(-)
 create mode 100644 clang/test/CodeGenObjC/selector-ref-invariance.m

diff --git a/clang/lib/CodeGen/CGObjCMac.cpp b/clang/lib/CodeGen/CGObjCMac.cpp
index 84277f6827e8..1cbcc58ae5f3 100644
--- a/clang/lib/CodeGen/CGObjCMac.cpp
+++ b/clang/lib/CodeGen/CGObjCMac.cpp
@@ -5887,7 +5887,12 @@ llvm::Value *CGObjCNonFragileABIMac::EmitSelector(CGBuilderTy &Builder,
 
   if (lval)
     return Entry;
-  return Builder.CreateLoad(Entry);
+  llvm::LoadInst* LI = Builder.CreateLoad(Entry);
+  
+  LI->setMetadata(CGM.getModule().getMDKindID("invariant.load"), 
+                  llvm::MDNode::get(VMContext,
+                                    ArrayRef<llvm::Value*>()));
+  return LI;
 }
 /// EmitObjCIvarAssign - Code gen for assigning to a __strong object.
 /// objc_assign_ivar (id src, id *dst, ptrdiff_t)
diff --git a/clang/test/CodeGenObjC/selector-ref-invariance.m b/clang/test/CodeGenObjC/selector-ref-invariance.m
new file mode 100644
index 000000000000..e356419de9e8
--- /dev/null
+++ b/clang/test/CodeGenObjC/selector-ref-invariance.m
@@ -0,0 +1,9 @@
+// RUN: %clang_cc1 -triple x86_64-apple-darwin11 -emit-llvm -fblocks -o - %s | FileCheck %s
+
+// rdar://6027699
+
+void test(id x) {
+// CHECK: load i8** @"\01L_OBJC_SELECTOR_REFERENCES_", !invariant.load
+// CHECK: @objc_msgSend
+  [x foo];
+}