Index: lib/Target/ARM/Thumb2ITBlockPass.cpp
===================================================================
--- lib/Target/ARM/Thumb2ITBlockPass.cpp
+++ lib/Target/ARM/Thumb2ITBlockPass.cpp
@@ -158,7 +158,12 @@
   return false;
 }
 
+static bool IsAddress(const MachineOperand &MO) {
+  return MO.isGlobal() || MO.isSymbol() || MO.isCPI();
+}
+
 bool Thumb2ITBlockPass::InsertITInstructions(MachineBasicBlock &MBB) {
+  const Triple T(MBB.getParent()->getTarget().getTargetTriple());
   bool Modified = false;
 
   SmallSet<unsigned, 4> Defs;
@@ -207,6 +212,16 @@
         MachineInstr *NMI = &*MBBI;
         MI = NMI;
 
+        if (T.isOSWindows()) {
+          if (MI->getOpcode() == ARM::t2MOVi16 && IsAddress(MI->getOperand(1))) {
+            assert(MI->getOperand(1).getTargetFlags() == ARMII::MO_LO16 &&
+                   "expected low address load");
+            assert(MBBI != E && "expected hi address load instruction");
+            if (Pos < 2)
+              break;
+          }
+        }
+
         unsigned NPredReg = 0;
         ARMCC::CondCodes NCC = getITInstrPredicate(NMI, NPredReg);
         if (NCC == CC || NCC == OCC) {