diff --git a/llvm/include/llvm/CodeGen/ReachingDefAnalysis.h b/llvm/include/llvm/CodeGen/ReachingDefAnalysis.h
--- a/llvm/include/llvm/CodeGen/ReachingDefAnalysis.h
+++ b/llvm/include/llvm/CodeGen/ReachingDefAnalysis.h
@@ -102,7 +102,7 @@
   MBBReachingDefsInfo MBBReachingDefs;
 
   /// Default values are 'nothing happened a long time ago'.
-  const int ReachingDefDefaultVal = -(1 << 20);
+  const int ReachingDefDefaultVal = -(1 << 21);
 
   using InstSet = SmallPtrSetImpl<MachineInstr*>;
   using BlockSet = SmallPtrSetImpl<MachineBasicBlock*>;