diff --git a/lib/Target/TargetInstrInfo.cpp b/lib/Target/TargetInstrInfo.cpp
index d1413510fff..20f32a2ad9b 100644
--- a/lib/Target/TargetInstrInfo.cpp
+++ b/lib/Target/TargetInstrInfo.cpp
@@ -84,3 +84,7 @@ bool TargetInstrInfo::PredicateInstruction(MachineInstr *MI,
   }
   return MadeChange;
 }
+
+unsigned TargetInstrInfo::getBlockSize(MachineBasicBlock *MBB) const {
+  return (unsigned)std::distance(MBB->begin(), MBB->end());
+}