Index: lib/CodeGen/ScheduleDAGInstrs.cpp
===================================================================
--- lib/CodeGen/ScheduleDAGInstrs.cpp
+++ lib/CodeGen/ScheduleDAGInstrs.cpp
@@ -971,15 +971,16 @@
     // Now process all uses.
     for (unsigned j = 0, n = MI->getNumOperands(); j != n; ++j) {
       const MachineOperand &MO = MI->getOperand(j);
-      if (!MO.isReg() || !MO.isUse())
+      if (!MO.isReg())
         continue;
       unsigned Reg = MO.getReg();
       if (Reg == 0)
         continue;
 
-      if (TRI->isPhysicalRegister(Reg))
-        addPhysRegDeps(SU, j);
-      else if (MO.readsReg()) // ignore undef operands
+      if (TRI->isPhysicalRegister(Reg)) {
+        if (MO.isUse())
+          addPhysRegDeps(SU, j);
+      } else if (MO.readsReg()) // ignore undef operands
         addVRegUseDeps(SU, j);
     }