IRGen. Fix IR when message returns reference type.

// rdar://8604515.

llvm-svn: 126869

clang/lib/CodeGen/CGExprScalar.cpp

@@ -245,6 +245,9 @@ public:
     return EmitLoadOfLValue(E);
   }
   Value *VisitObjCMessageExpr(ObjCMessageExpr *E) {
+    if (E->getMethodDecl() && 
+        E->getMethodDecl()->getResultType()->isReferenceType())
+      return EmitLoadOfLValue(E);
     return CGF.EmitObjCMessageExpr(E).getScalarVal();
   }
 

clang/test/CodeGenObjCXX/message-reference.mm

@@ -0,0 +1,20 @@
+// RUN: %clang_cc1 -x objective-c++ -triple x86_64-apple-darwin10 -emit-llvm -o - %s | FileCheck %s
+// rdar://8604515
+
+@interface I {}
+-(unsigned int&)referenceCount;
+@end
+
+@interface MyClass
++(int)writeBlip:(I*)srcBlip;
+@end
+
+@implementation MyClass
++(int)writeBlip:(I*)srcBlip{
+  return ([srcBlip referenceCount] == 0);
+}
+@end
+
+// CHECK: [[T:%.*]] = call i32* bitcast (i8* (i8*, i8*, ...)* @objc_msgSend
+// CHECK: [[U:%.*]] = load i32* [[T]]
+// CHECK  [[V:%.*]] = icmp eq i32 [[U]], 0