diff --git a/include/llvm/CodeGen/MachineRegisterInfo.h b/include/llvm/CodeGen/MachineRegisterInfo.h
index 5b84922b554..453fe2c8343 100644
--- a/include/llvm/CodeGen/MachineRegisterInfo.h
+++ b/include/llvm/CodeGen/MachineRegisterInfo.h
@@ -110,13 +110,22 @@ public:
     RegNo -= TargetRegisterInfo::FirstVirtualRegister;
     return VRegInfo[RegNo].second;
   }
+
+  /// getVRegDef - Return the machine instr that defines the specified virtual
+  /// register or null if none is found.  This assumes that the code is in SSA
+  /// form, so there should only be one definition.
+  MachineInstr *getVRegDef(unsigned Reg) const;
+  
+#ifndef NDEBUG
+  void dumpUses(unsigned RegNo) const;
+#endif
   
   //===--------------------------------------------------------------------===//
   // Virtual Register Info
   //===--------------------------------------------------------------------===//
   
   /// getRegClass - Return the register class of the specified virtual register.
-  const TargetRegisterClass *getRegClass(unsigned Reg) {
+  const TargetRegisterClass *getRegClass(unsigned Reg) const {
     Reg -= TargetRegisterInfo::FirstVirtualRegister;
     assert(Reg < VRegInfo.size() && "Invalid vreg!");
     return VRegInfo[Reg].first;
@@ -145,11 +154,6 @@ public:
     return VRegInfo.size()+TargetRegisterInfo::FirstVirtualRegister-1;
   }
   
-  /// getVRegDef - Return the machine instr that defines the specified virtual
-  /// register or null if none is found.  This assumes that the code is in SSA
-  /// form, so there should only be one definition.
-  MachineInstr *getVRegDef(unsigned Reg) const;
-  
   
   //===--------------------------------------------------------------------===//
   // Physical Register Use Info
diff --git a/lib/CodeGen/MachineRegisterInfo.cpp b/lib/CodeGen/MachineRegisterInfo.cpp
index 62c9506050b..b3ee0358bb1 100644
--- a/lib/CodeGen/MachineRegisterInfo.cpp
+++ b/lib/CodeGen/MachineRegisterInfo.cpp
@@ -73,3 +73,11 @@ MachineInstr *MachineRegisterInfo::getVRegDef(unsigned Reg) const {
   }
   return 0;
 }
+
+
+#ifndef NDEBUG
+void MachineRegisterInfo::dumpUses(unsigned Reg) const {
+  for (use_iterator I = use_begin(Reg), E = use_end(); I != E; ++I)
+    I.getOperand().getParent()->dump();
+}
+#endif