diff --git a/lib/CodeGen/MachineInstr.cpp b/lib/CodeGen/MachineInstr.cpp
index 6f0b971..bc2a545 100644
--- a/lib/CodeGen/MachineInstr.cpp
+++ b/lib/CodeGen/MachineInstr.cpp
@@ -1253,6 +1253,17 @@
   return true;
 }
 
+/// copyImplicitOps - Copy implicit register operands from specified
+/// instruction to this instruction.
+void MachineInstr::copyImplicitOps(const MachineInstr *MI) {
+  for (unsigned i = MI->getDesc().getNumOperands(), e = MI->getNumOperands();
+       i != e; ++i) {
+    const MachineOperand &MO = MI->getOperand(i);
+    if (MO.isReg() && MO.isImplicit())
+      addOperand(MO);
+  }
+}
+
 void MachineInstr::dump() const {
   dbgs() << "  " << *this;
 }