diff --git a/lib/CodeGen/MachineInstr.cpp b/lib/CodeGen/MachineInstr.cpp
index fe78828..3025af9 100644
--- a/lib/CodeGen/MachineInstr.cpp
+++ b/lib/CodeGen/MachineInstr.cpp
@@ -23,6 +23,7 @@
 #include "llvm/Target/TargetInstrDesc.h"
 #include "llvm/Target/TargetRegisterInfo.h"
 #include "llvm/Support/LeakDetector.h"
+#include "llvm/Support/MathExtras.h"
 #include "llvm/Support/Streams.h"
 #include <ostream>
 using namespace llvm;
@@ -239,6 +240,16 @@
 }
 
 //===----------------------------------------------------------------------===//
+// MachineMemOperand Implementation
+//===----------------------------------------------------------------------===//
+
+MachineMemOperand::MachineMemOperand(const Value *v, unsigned int f,
+                                     int64_t o, uint64_t s, unsigned int a)
+  : Offset(o), Size(s), V(v),
+    Flags((f & 7) | ((Log2_32(a) + 1) << 3)) {
+}
+
+//===----------------------------------------------------------------------===//
 // MachineInstr Implementation
 //===----------------------------------------------------------------------===//