diff --git a/llvm/include/llvm/CodeGen/LiveIntervalAnalysis.h b/llvm/include/llvm/CodeGen/LiveIntervalAnalysis.h
index 1356755fb2b3..a313c4b9f42b 100644
--- a/llvm/include/llvm/CodeGen/LiveIntervalAnalysis.h
+++ b/llvm/include/llvm/CodeGen/LiveIntervalAnalysis.h
@@ -171,6 +171,10 @@ namespace llvm {
     /// register classes.  The registers may be either phys or virt regs.
     bool differingRegisterClasses(unsigned RegA, unsigned RegB) const;
 
+    bool AdjustIfAllOverlappingRangesAreCopiesFrom(LiveInterval &IntA,
+                                                   LiveInterval &IntB,
+                                                   unsigned CopyIdx);
+
     bool overlapsAliases(const LiveInterval *lhs,
                          const LiveInterval *rhs) const;