diff --git a/include/llvm/Target/TargetInstrInfo.h b/include/llvm/Target/TargetInstrInfo.h
index a2654c9..6615ee4 100644
--- a/include/llvm/Target/TargetInstrInfo.h
+++ b/include/llvm/Target/TargetInstrInfo.h
@@ -600,6 +600,7 @@
   /// *only* if a transformation took place.
   virtual bool OptimizeCompareInstr(MachineInstr *CmpInstr,
                                     unsigned SrcReg, int Mask, int Value,
+                                    const MachineRegisterInfo *MRI,
                                     MachineBasicBlock::iterator &) const {
     return false;
   }
diff --git a/lib/CodeGen/PeepholeOptimizer.cpp b/lib/CodeGen/PeepholeOptimizer.cpp
index b245692..7ae6d5f 100644
--- a/lib/CodeGen/PeepholeOptimizer.cpp
+++ b/lib/CodeGen/PeepholeOptimizer.cpp
@@ -247,7 +247,7 @@
     return false;
 
   // Attempt to optimize the comparison instruction.
-  if (TII->OptimizeCompareInstr(MI, SrcReg, CmpMask, CmpValue, NextIter)) {
+  if (TII->OptimizeCompareInstr(MI, SrcReg, CmpMask, CmpValue, MRI, NextIter)) {
     ++NumEliminated;
     return true;
   }
diff --git a/lib/Target/ARM/ARMBaseInstrInfo.cpp b/lib/Target/ARM/ARMBaseInstrInfo.cpp
index 26b4f0e..aca292a 100644
--- a/lib/Target/ARM/ARMBaseInstrInfo.cpp
+++ b/lib/Target/ARM/ARMBaseInstrInfo.cpp
@@ -1490,13 +1490,13 @@
 /// iterator *only* if a transformation took place.
 bool ARMBaseInstrInfo::
 OptimizeCompareInstr(MachineInstr *CmpInstr, unsigned SrcReg, int CmpMask,
-                     int CmpValue, MachineBasicBlock::iterator &MII) const {
+                     int CmpValue, const MachineRegisterInfo *MRI,
+                     MachineBasicBlock::iterator &MII) const {
   if (CmpValue != 0)
     return false;
 
-  MachineRegisterInfo &MRI = CmpInstr->getParent()->getParent()->getRegInfo();
-  MachineRegisterInfo::def_iterator DI = MRI.def_begin(SrcReg);
-  if (llvm::next(DI) != MRI.def_end())
+  MachineRegisterInfo::def_iterator DI = MRI->def_begin(SrcReg);
+  if (llvm::next(DI) != MRI->def_end())
     // Only support one definition.
     return false;
 
@@ -1506,8 +1506,8 @@
   if (CmpMask != ~0) {
     if (!isSuitableForMask(MI, SrcReg, CmpMask, false)) {
       MI = 0;
-      for (MachineRegisterInfo::use_iterator UI = MRI.use_begin(SrcReg),
-           UE = MRI.use_end(); UI != UE; ++UI) {
+      for (MachineRegisterInfo::use_iterator UI = MRI->use_begin(SrcReg),
+           UE = MRI->use_end(); UI != UE; ++UI) {
         if (UI->getParent() != CmpInstr->getParent()) continue;
         MachineInstr *PotentialAND = &*UI;
         if (!isSuitableForMask(PotentialAND, SrcReg, CmpMask, true))
diff --git a/lib/Target/ARM/ARMBaseInstrInfo.h b/lib/Target/ARM/ARMBaseInstrInfo.h
index cbfd752..36be336 100644
--- a/lib/Target/ARM/ARMBaseInstrInfo.h
+++ b/lib/Target/ARM/ARMBaseInstrInfo.h
@@ -341,6 +341,7 @@
   /// that we can remove a "comparison with zero".
   virtual bool OptimizeCompareInstr(MachineInstr *CmpInstr, unsigned SrcReg,
                                     int CmpMask, int CmpValue,
+                                    const MachineRegisterInfo *MRI,
                                     MachineBasicBlock::iterator &MII) const;
 
   virtual unsigned getNumMicroOps(const MachineInstr *MI,