Add basic support for adding !tbaa.struct metadata on llvm.memcpy calls for
struct assignment.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@164853 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CGExprAgg.cpp b/lib/CodeGen/CGExprAgg.cpp
index 48b21d2..c9ffc19 100644
--- a/lib/CodeGen/CGExprAgg.cpp
+++ b/lib/CodeGen/CGExprAgg.cpp
@@ -1362,11 +1362,17 @@
}
}
}
+
+ // Determine the metadata to describe the position of any padding in this
+ // memcpy, as well as the TBAA tags for the members of the struct, in case
+ // the optimizer wishes to expand it in to scalar memory operations.
+ llvm::MDNode *TBAAStructTag = CGM.getTBAAStructInfo(Ty);
Builder.CreateMemCpy(DestPtr, SrcPtr,
llvm::ConstantInt::get(IntPtrTy,
TypeInfo.first.getQuantity()),
- alignment.getQuantity(), isVolatile);
+ alignment.getQuantity(), isVolatile,
+ /*TBAATag=*/0, TBAAStructTag);
}
void CodeGenFunction::MaybeEmitStdInitializerListCleanup(llvm::Value *loc,