diff --git a/include/llvm/Analysis/RegionInfo.h b/include/llvm/Analysis/RegionInfo.h
index 7a2670f..aca1351 100644
--- a/include/llvm/Analysis/RegionInfo.h
+++ b/include/llvm/Analysis/RegionInfo.h
@@ -565,6 +565,12 @@
   /// region containing BB.
   Region *getRegionFor(BasicBlock *BB) const;
 
+  /// @brief  Set the smallest region that surrounds a basic block.
+  ///
+  /// @param BB The basic block surrounded by a region.
+  /// @param R The smallest region that surrounds BB.
+  void setRegionFor(BasicBlock *BB, Region *R);
+
   /// @brief A shortcut for getRegionFor().
   ///
   /// @param BB The basic block.
diff --git a/lib/Analysis/RegionInfo.cpp b/lib/Analysis/RegionInfo.cpp
index 6593f07..99c2eed 100644
--- a/lib/Analysis/RegionInfo.cpp
+++ b/lib/Analysis/RegionInfo.cpp
@@ -659,11 +659,14 @@
   return I != BBtoRegion.end() ? I->second : 0;
 }
 
+void RegionInfo::setRegionFor(BasicBlock *BB, Region *R) {
+  BBtoRegion[BB] = R;
+}
+
 Region *RegionInfo::operator[](BasicBlock *BB) const {
   return getRegionFor(BB);
 }
 
-
 BasicBlock *RegionInfo::getMaxRegionExit(BasicBlock *BB) const {
   BasicBlock *Exit = NULL;