diff --git a/llvm/lib/CodeGen/MachineLoopInfo.cpp b/llvm/lib/CodeGen/MachineLoopInfo.cpp
--- a/llvm/lib/CodeGen/MachineLoopInfo.cpp
+++ b/llvm/lib/CodeGen/MachineLoopInfo.cpp
@@ -80,7 +80,7 @@
     MachineBasicBlock *NextMBB = &*std::next(BotMBB->getIterator());
     while (contains(NextMBB)) {
       BotMBB = NextMBB;
-      if (BotMBB == &*std::next(BotMBB->getIterator()))
+      if (BotMBB->getIterator() == std::prev(End))
         break;
       NextMBB = &*std::next(BotMBB->getIterator());
     }