Add a doxygen comment for SrcValueSDNode, to make its purpose

clear and to clarify how it differs from MemOperandSDNode.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47015 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 8 insertions, 0 deletions

diff --git a/include/llvm/CodeGen/SelectionDAGNodes.h b/include/llvm/CodeGen/SelectionDAGNodes.h
index 4117552b52..f8381c7b59 100644
--- a/include/llvm/CodeGen/SelectionDAGNodes.h
+++ b/include/llvm/CodeGen/SelectionDAGNodes.h
@@ -1396,6 +1396,14 @@ public:
   }
 };
 
+/// SrcValueSDNode - An SDNode that holds an arbitrary LLVM IR Value. This is
+/// used when the SelectionDAG needs to make a simple reference to something
+/// in the LLVM IR representation.
+///
+/// Note that this is not used for carrying alias information; that is done
+/// with MemOperandSDNode, which includes a Value which is required to be a
+/// pointer, and several other fields specific to memory references.
+///
 class SrcValueSDNode : public SDNode {
   const Value *V;
   virtual void ANCHOR();  // Out-of-line virtual method to give class a home.