diff --git a/llvm/include/llvm/CodeGen/MachineBasicBlock.h b/llvm/include/llvm/CodeGen/MachineBasicBlock.h
index 0f2f8746b382505d0f16ba4e883f8dc313c79244..d6f588304f593e378e7bcbeedc1406b42f75340b 100644
--- a/llvm/include/llvm/CodeGen/MachineBasicBlock.h
+++ b/llvm/include/llvm/CodeGen/MachineBasicBlock.h
@@ -296,6 +296,11 @@ public:
   /// is an error to add the same register to the same set more than once.
   void addLiveIn(unsigned Reg)  { LiveIns.push_back(Reg); }
 
+  /// Add PhysReg as live in to this block, and ensure that there is a copy of
+  /// PhysReg to a virtual register of class RC. Return the virtual register
+  /// that is a copy of the live in PhysReg.
+  unsigned addLiveIn(unsigned PhysReg, const TargetRegisterClass *RC);
+
   /// removeLiveIn - Remove the specified register from the live in set.
   ///
   void removeLiveIn(unsigned Reg);
diff --git a/llvm/lib/CodeGen/MachineBasicBlock.cpp b/llvm/lib/CodeGen/MachineBasicBlock.cpp
index feba07898af6d2a6b9b7ddcf96d949f2aaa39b1b..7bb0d32e6b13021185b4854390ec5c7c197d36c0 100644
--- a/llvm/lib/CodeGen/MachineBasicBlock.cpp
+++ b/llvm/lib/CodeGen/MachineBasicBlock.cpp
@@ -19,6 +19,7 @@
 #include "llvm/CodeGen/LiveVariables.h"
 #include "llvm/CodeGen/MachineDominators.h"
 #include "llvm/CodeGen/MachineFunction.h"
+#include "llvm/CodeGen/MachineInstrBuilder.h"
 #include "llvm/CodeGen/MachineLoopInfo.h"
 #include "llvm/CodeGen/MachineRegisterInfo.h"
 #include "llvm/CodeGen/SlotIndexes.h"
@@ -341,6 +342,38 @@ bool MachineBasicBlock::isLiveIn(unsigned Reg) const {
   return I != livein_end();
 }
 
+unsigned
+MachineBasicBlock::addLiveIn(unsigned PhysReg, const TargetRegisterClass *RC) {
+  assert(getParent() && "MBB must be inserted in function");
+  assert(TargetRegisterInfo::isPhysicalRegister(PhysReg) && "Expected physreg");
+  assert(RC && "Register class is required");
+  assert((isLandingPad() || this == &getParent()->front()) &&
+         "Only the entry block and landing pads can have physreg live ins");
+
+  bool LiveIn = isLiveIn(PhysReg);
+  iterator I = getFirstNonPHI(), E = end();
+  MachineRegisterInfo &MRI = getParent()->getRegInfo();
+  const TargetInstrInfo &TII = *getParent()->getTarget().getInstrInfo();
+
+  // Look for an existing copy.
+  if (LiveIn)
+    for (;I != E && I->isCopy(); ++I)
+      if (I->getOperand(1).getReg() == PhysReg) {
+        unsigned VirtReg = I->getOperand(0).getReg();
+        if (!MRI.constrainRegClass(VirtReg, RC))
+          llvm_unreachable("Incompatible live-in register class.");
+        return VirtReg;
+      }
+
+  // No luck, create a virtual register.
+  unsigned VirtReg = MRI.createVirtualRegister(RC);
+  BuildMI(*this, I, DebugLoc(), TII.get(TargetOpcode::COPY), VirtReg)
+    .addReg(PhysReg, RegState::Kill);
+  if (!LiveIn)
+    addLiveIn(PhysReg);
+  return VirtReg;
+}
+
 void MachineBasicBlock::moveBefore(MachineBasicBlock *NewAfter) {
   getParent()->splice(NewAfter, this);
 }