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In my last patch initialize the destination to null (with a simple store) before doing a storeStrong to it. 

// rdar://12530881

llvm-svn: 171572
This commit is contained in:
Fariborz Jahanian 2013-01-05 00:32:13 +00:00
parent 770c550990
commit cc2ae88e3c
2 changed files with 3 additions and 0 deletions
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2
clang/lib/CodeGen/CGBlocks.cpp
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@ -1566,6 +1566,8 @@ public:
llvm::ConstantPointerNull::get(cast<llvm::PointerType>(value->getType()));
if (CGF.CGM.getCodeGenOpts().OptimizationLevel == 0) {
llvm::StoreInst *store = CGF.Builder.CreateStore(null, destField);
store->setAlignment(Alignment.getQuantity());
CGF.EmitARCStoreStrongCall(destField, value, /*ignored*/ true);
CGF.EmitARCStoreStrongCall(srcField, null, /*ignored*/ true);
return;

1
clang/test/CodeGenObjC/arc-unoptimized-byref-var.m
View File

@ -7,6 +7,7 @@ void test19() {
// CHECK-UNOPT: [[X:%.*]] = getelementptr inbounds [[BYREF_T:%.*]]* [[VAR:%.*]], i32 0, i32 6
// CHECK-UNOPT: [[X2:%.*]] = getelementptr inbounds [[BYREF_T:%.*]]* [[VAR1:%.*]], i32 0, i32 6
// CHECK-UNOPT-NEXT: [[SIX:%.*]] = load i8** [[X2]], align 8
// CHECK-UNOPT-NEXT: store i8* null, i8** [[X]], align 8
// CHECK-UNOPT-NEXT: call void @objc_storeStrong(i8** [[X]], i8* [[SIX]]) nounwind
// CHECK-UNOPT-NEXT: call void @objc_storeStrong(i8** [[X2]], i8* null) nounwind
// CHECK-UNOPT-NEXT: ret void