2 files changed, 6 insertions, 3 deletions
diff --git a/include/llvm/CodeGen/Analysis.h b/include/llvm/CodeGen/Analysis.h
index fda801cb97..0b609ed658 100644
--- a/include/llvm/CodeGen/Analysis.h
+++ b/include/llvm/CodeGen/Analysis.h
@@ -27,6 +27,7 @@ namespace llvm {
 class GlobalVariable;
 class TargetLowering;
 class SDNode;
+class SDValue;
 class SelectionDAG;
 
 /// ComputeLinearIndex - Given an LLVM IR aggregate type and a sequence
@@ -89,7 +90,7 @@ bool isInTailCallPosition(ImmutableCallSite CS, Attributes CalleeRetAttr,
                           const TargetLowering &TLI);
 
 bool isInTailCallPosition(SelectionDAG &DAG, SDNode *Node,
-                          const TargetLowering &TLI);
+                          SDValue &Chain, const TargetLowering &TLI);
 
 } // End llvm namespace
 
diff --git a/include/llvm/Target/TargetLowering.h b/include/llvm/Target/TargetLowering.h
index c885d2a359..720c9df99e 100644
--- a/include/llvm/Target/TargetLowering.h
+++ b/include/llvm/Target/TargetLowering.h
@@ -1274,9 +1274,11 @@ public:
   }
 
   /// isUsedByReturnOnly - Return true if result of the specified node is used
-  /// by a return node only. This is used to determine whether it is possible
+  /// by a return node only. It also compute and return the input chain for the
+  /// tail call.
+  /// This is used to determine whether it is possible
   /// to codegen a libcall as tail call at legalization time.
-  virtual bool isUsedByReturnOnly(SDNode *) const {
+  virtual bool isUsedByReturnOnly(SDNode *, SDValue &Chain) const {
     return false;
   }