objective-C arc: in copy helper function for

__strong __block variables, perform objc_storeStrong on
source and destination instead of direct move. This 
is done with -O0 and to improve some analysis.
// rdar://12530881

llvm-svn: 171555

1 files changed, 5 insertions, 0 deletions

diff --git a/clang/lib/CodeGen/CGBlocks.cpp b/clang/lib/CodeGen/CGBlocks.cpp
index 54bcb88ce38..e33e6644307 100644
--- a/clang/lib/CodeGen/CGBlocks.cpp
+++ b/clang/lib/CodeGen/CGBlocks.cpp
@@ -1565,6 +1565,11 @@ public:
     llvm::Value *null =
       llvm::ConstantPointerNull::get(cast<llvm::PointerType>(value->getType()));
 
+    if (CGF.CGM.getCodeGenOpts().OptimizationLevel == 0) {
+      CGF.EmitARCStoreStrongCall(destField, value, /*ignored*/ true);
+      CGF.EmitARCStoreStrongCall(srcField, null, /*ignored*/ true);
+      return;
+    }
     llvm::StoreInst *store = CGF.Builder.CreateStore(value, destField);
     store->setAlignment(Alignment.getQuantity());