diff --git a/include/llvm/Analysis/RegionInfo.h b/include/llvm/Analysis/RegionInfo.h
index f982b9f9ff3..4e7d303863b 100644
--- a/include/llvm/Analysis/RegionInfo.h
+++ b/include/llvm/Analysis/RegionInfo.h
@@ -638,6 +638,12 @@ public:
     return TopLevelRegion;
   }
 
+  /// @brief Update RegionInfo after a basic block was split.
+  ///
+  /// @param NewBB The basic block that was created before OldBB.
+  /// @param OldBB The old basic block.
+  void splitBlock(BasicBlock* NewBB, BasicBlock *OldBB);
+
   /// @brief Clear the Node Cache for all Regions.
   ///
   /// @see Region::clearNodeCache()
diff --git a/lib/Analysis/RegionInfo.cpp b/lib/Analysis/RegionInfo.cpp
index 2576d4ee14a..4a0a9a3ccec 100644
--- a/lib/Analysis/RegionInfo.cpp
+++ b/lib/Analysis/RegionInfo.cpp
@@ -807,6 +807,19 @@ RegionInfo::getCommonRegion(SmallVectorImpl<BasicBlock*> &BBs) const {
   return ret;
 }
 
+void RegionInfo::splitBlock(BasicBlock* NewBB, BasicBlock *OldBB)
+{
+  Region *R = getRegionFor(OldBB);
+  setRegionFor(NewBB, R);
+
+  while (R->getEntry() == OldBB && R->getParent()) {
+    R->replaceEntry(NewBB);
+    R = R->getParent();
+  }
+
+  setRegionFor(OldBB, R);
+}
+
 char RegionInfo::ID = 0;
 INITIALIZE_PASS_BEGIN(RegionInfo, "regions",
                 "Detect single entry single exit regions", true, true)