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: 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 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

(limited to 'clang/lib/CodeGen/CGObjCMac.cpp')

diff --git a/clang/lib/CodeGen/CGObjCMac.cpp b/clang/lib/CodeGen/CGObjCMac.cpp
index 84277f6827e..1cbcc58ae5f 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)
-- 
cgit v1.2.3