diff --git a/include/llvm/MC/MCInstPrinter.h b/include/llvm/MC/MCInstPrinter.h
index 01ad2d3..4d2adfa 100644
--- a/include/llvm/MC/MCInstPrinter.h
+++ b/include/llvm/MC/MCInstPrinter.h
@@ -14,6 +14,7 @@
 class MCInst;
 class raw_ostream;
 class MCAsmInfo;
+class MCRegisterInfo;
 class StringRef;
 
 /// MCInstPrinter - This is an instance of a target assembly language printer
@@ -25,6 +26,7 @@
   /// assembly emission is disable.
   raw_ostream *CommentStream;
   const MCAsmInfo &MAI;
+  const MCRegisterInfo &MRI;
 
   /// The current set of available features.
   unsigned AvailableFeatures;
@@ -32,8 +34,8 @@
   /// Utility function for printing annotations.
   void printAnnotation(raw_ostream &OS, StringRef Annot);
 public:
-  MCInstPrinter(const MCAsmInfo &mai)
-    : CommentStream(0), MAI(mai), AvailableFeatures(0) {}
+  MCInstPrinter(const MCAsmInfo &mai, const MCRegisterInfo &mri)
+    : CommentStream(0), MAI(mai), MRI(mri), AvailableFeatures(0) {}
 
   virtual ~MCInstPrinter();
 
diff --git a/include/llvm/Support/TargetRegistry.h b/include/llvm/Support/TargetRegistry.h
index aef43b1..93bdbca 100644
--- a/include/llvm/Support/TargetRegistry.h
+++ b/include/llvm/Support/TargetRegistry.h
@@ -104,6 +104,7 @@
     typedef MCInstPrinter *(*MCInstPrinterCtorTy)(const Target &T,
                                                   unsigned SyntaxVariant,
                                                   const MCAsmInfo &MAI,
+                                                  const MCRegisterInfo &MRI,
                                                   const MCSubtargetInfo &STI);
     typedef MCCodeEmitter *(*MCCodeEmitterCtorTy)(const MCInstrInfo &II,
                                                   const MCSubtargetInfo &STI,
@@ -392,10 +393,11 @@
 
     MCInstPrinter *createMCInstPrinter(unsigned SyntaxVariant,
                                        const MCAsmInfo &MAI,
+                                       const MCRegisterInfo &MRI,
                                        const MCSubtargetInfo &STI) const {
       if (!MCInstPrinterCtorFn)
         return 0;
-      return MCInstPrinterCtorFn(*this, SyntaxVariant, MAI, STI);
+      return MCInstPrinterCtorFn(*this, SyntaxVariant, MAI, MRI, STI);
     }
 
 
diff --git a/lib/CodeGen/LLVMTargetMachine.cpp b/lib/CodeGen/LLVMTargetMachine.cpp
index f10bdb5..17633e2 100644
--- a/lib/CodeGen/LLVMTargetMachine.cpp
+++ b/lib/CodeGen/LLVMTargetMachine.cpp
@@ -171,7 +171,8 @@
   switch (FileType) {
   case CGFT_AssemblyFile: {
     MCInstPrinter *InstPrinter =
-      getTarget().createMCInstPrinter(MAI.getAssemblerDialect(), MAI, STI);
+      getTarget().createMCInstPrinter(MAI.getAssemblerDialect(), MAI,
+                                      Context->getRegisterInfo(), STI);
 
     // Create a code emitter if asked to show the encoding.
     MCCodeEmitter *MCE = 0;
diff --git a/lib/MC/MCDisassembler/Disassembler.cpp b/lib/MC/MCDisassembler/Disassembler.cpp
index 605cf88..572a5a5 100644
--- a/lib/MC/MCDisassembler/Disassembler.cpp
+++ b/lib/MC/MCDisassembler/Disassembler.cpp
@@ -80,7 +80,7 @@
   // Set up the instruction printer.
   int AsmPrinterVariant = MAI->getAssemblerDialect();
   MCInstPrinter *IP = TheTarget->createMCInstPrinter(AsmPrinterVariant,
-                                                     *MAI, *STI);
+                                                     *MAI, *MRI, *STI);
   assert(IP && "Unable to create instruction printer!");
 
   LLVMDisasmContext *DC = new LLVMDisasmContext(TripleName, DisInfo, TagType,
diff --git a/lib/MC/MCDisassembler/EDDisassembler.cpp b/lib/MC/MCDisassembler/EDDisassembler.cpp
index b1f0e5b..4c2dae8 100644
--- a/lib/MC/MCDisassembler/EDDisassembler.cpp
+++ b/lib/MC/MCDisassembler/EDDisassembler.cpp
@@ -168,7 +168,8 @@
   
   InstString.reset(new std::string);
   InstStream.reset(new raw_string_ostream(*InstString));
-  InstPrinter.reset(Tgt->createMCInstPrinter(LLVMSyntaxVariant, *AsmInfo, *STI));
+  InstPrinter.reset(Tgt->createMCInstPrinter(LLVMSyntaxVariant, *AsmInfo,
+                                             *MRI, *STI));
   
   if (!InstPrinter)
     return;
diff --git a/lib/Target/ARM/InstPrinter/ARMInstPrinter.cpp b/lib/Target/ARM/InstPrinter/ARMInstPrinter.cpp
index b0b1dbb..cfb5b92 100644
--- a/lib/Target/ARM/InstPrinter/ARMInstPrinter.cpp
+++ b/lib/Target/ARM/InstPrinter/ARMInstPrinter.cpp
@@ -35,8 +35,9 @@
 
 
 ARMInstPrinter::ARMInstPrinter(const MCAsmInfo &MAI,
+                               const MCRegisterInfo &MRI,
                                const MCSubtargetInfo &STI) :
-  MCInstPrinter(MAI) {
+  MCInstPrinter(MAI, MRI) {
   // Initialize the set of available features.
   setAvailableFeatures(STI.getFeatureBits());
 }
diff --git a/lib/Target/ARM/InstPrinter/ARMInstPrinter.h b/lib/Target/ARM/InstPrinter/ARMInstPrinter.h
index c943c9c..3c8b6cf 100644
--- a/lib/Target/ARM/InstPrinter/ARMInstPrinter.h
+++ b/lib/Target/ARM/InstPrinter/ARMInstPrinter.h
@@ -23,7 +23,8 @@
 
 class ARMInstPrinter : public MCInstPrinter {
 public:
-    ARMInstPrinter(const MCAsmInfo &MAI, const MCSubtargetInfo &STI);
+  ARMInstPrinter(const MCAsmInfo &MAI, const MCRegisterInfo &MRI,
+                 const MCSubtargetInfo &STI);
 
   virtual void printInst(const MCInst *MI, raw_ostream &O, StringRef Annot);
   virtual StringRef getOpcodeName(unsigned Opcode) const;
diff --git a/lib/Target/ARM/MCTargetDesc/ARMMCTargetDesc.cpp b/lib/Target/ARM/MCTargetDesc/ARMMCTargetDesc.cpp
index 32bf18c..1606b92 100644
--- a/lib/Target/ARM/MCTargetDesc/ARMMCTargetDesc.cpp
+++ b/lib/Target/ARM/MCTargetDesc/ARMMCTargetDesc.cpp
@@ -163,9 +163,10 @@
 static MCInstPrinter *createARMMCInstPrinter(const Target &T,
                                              unsigned SyntaxVariant,
                                              const MCAsmInfo &MAI,
+                                             const MCRegisterInfo &MRI,
                                              const MCSubtargetInfo &STI) {
   if (SyntaxVariant == 0)
-    return new ARMInstPrinter(MAI, STI);
+    return new ARMInstPrinter(MAI, MRI, STI);
   return 0;
 }
 
diff --git a/lib/Target/MBlaze/InstPrinter/MBlazeInstPrinter.h b/lib/Target/MBlaze/InstPrinter/MBlazeInstPrinter.h
index c6f3003..236583a 100644
--- a/lib/Target/MBlaze/InstPrinter/MBlazeInstPrinter.h
+++ b/lib/Target/MBlaze/InstPrinter/MBlazeInstPrinter.h
@@ -21,8 +21,8 @@
 
   class MBlazeInstPrinter : public MCInstPrinter {
   public:
-    MBlazeInstPrinter(const MCAsmInfo &MAI)
-      : MCInstPrinter(MAI) {}
+    MBlazeInstPrinter(const MCAsmInfo &MAI, const MCRegisterInfo &MRI)
+      : MCInstPrinter(MAI, MRI) {}
 
     virtual void printInst(const MCInst *MI, raw_ostream &O, StringRef Annot);
 
diff --git a/lib/Target/MBlaze/MCTargetDesc/MBlazeMCTargetDesc.cpp b/lib/Target/MBlaze/MCTargetDesc/MBlazeMCTargetDesc.cpp
index f83e8ab..5da0aa7 100644
--- a/lib/Target/MBlaze/MCTargetDesc/MBlazeMCTargetDesc.cpp
+++ b/lib/Target/MBlaze/MCTargetDesc/MBlazeMCTargetDesc.cpp
@@ -95,9 +95,10 @@
 static MCInstPrinter *createMBlazeMCInstPrinter(const Target &T,
                                                 unsigned SyntaxVariant,
                                                 const MCAsmInfo &MAI,
+                                                const MCRegisterInfo &MRI,
                                                 const MCSubtargetInfo &STI) {
   if (SyntaxVariant == 0)
-    return new MBlazeInstPrinter(MAI);
+    return new MBlazeInstPrinter(MAI, MRI);
   return 0;
 }
 
diff --git a/lib/Target/MSP430/InstPrinter/MSP430InstPrinter.h b/lib/Target/MSP430/InstPrinter/MSP430InstPrinter.h
index 6f95ca3..3fd7ce0 100644
--- a/lib/Target/MSP430/InstPrinter/MSP430InstPrinter.h
+++ b/lib/Target/MSP430/InstPrinter/MSP430InstPrinter.h
@@ -21,8 +21,8 @@
 
   class MSP430InstPrinter : public MCInstPrinter {
   public:
-    MSP430InstPrinter(const MCAsmInfo &MAI)
-        : MCInstPrinter(MAI) {}
+    MSP430InstPrinter(const MCAsmInfo &MAI, const MCRegisterInfo &MRI)
+        : MCInstPrinter(MAI, MRI) {}
 
     virtual void printInst(const MCInst *MI, raw_ostream &O, StringRef Annot);
 
diff --git a/lib/Target/MSP430/MCTargetDesc/MSP430MCTargetDesc.cpp b/lib/Target/MSP430/MCTargetDesc/MSP430MCTargetDesc.cpp
index 22cc33a..8545055 100644
--- a/lib/Target/MSP430/MCTargetDesc/MSP430MCTargetDesc.cpp
+++ b/lib/Target/MSP430/MCTargetDesc/MSP430MCTargetDesc.cpp
@@ -61,9 +61,10 @@
 static MCInstPrinter *createMSP430MCInstPrinter(const Target &T,
                                                 unsigned SyntaxVariant,
                                                 const MCAsmInfo &MAI,
+                                                const MCRegisterInfo &MRI,
                                                 const MCSubtargetInfo &STI) {
   if (SyntaxVariant == 0)
-    return new MSP430InstPrinter(MAI);
+    return new MSP430InstPrinter(MAI, MRI);
   return 0;
 }
 
diff --git a/lib/Target/Mips/InstPrinter/MipsInstPrinter.h b/lib/Target/Mips/InstPrinter/MipsInstPrinter.h
index 931c44b..acd761d 100644
--- a/lib/Target/Mips/InstPrinter/MipsInstPrinter.h
+++ b/lib/Target/Mips/InstPrinter/MipsInstPrinter.h
@@ -77,7 +77,8 @@
 
 class MipsInstPrinter : public MCInstPrinter {
 public:
-  MipsInstPrinter(const MCAsmInfo &MAI) : MCInstPrinter(MAI) {}
+  MipsInstPrinter(const MCAsmInfo &MAI, const MCRegisterInfo &MRI) :
+    MCInstPrinter(MAI, MRI) {}
 
   // Autogenerated by tblgen.
   void printInstruction(const MCInst *MI, raw_ostream &O);
diff --git a/lib/Target/Mips/MCTargetDesc/MipsMCTargetDesc.cpp b/lib/Target/Mips/MCTargetDesc/MipsMCTargetDesc.cpp
index 0a2dadd..7652675 100644
--- a/lib/Target/Mips/MCTargetDesc/MipsMCTargetDesc.cpp
+++ b/lib/Target/Mips/MCTargetDesc/MipsMCTargetDesc.cpp
@@ -76,8 +76,9 @@
 static MCInstPrinter *createMipsMCInstPrinter(const Target &T,
                                               unsigned SyntaxVariant,
                                               const MCAsmInfo &MAI,
+                                              const MCRegisterInfo &MRI,
                                               const MCSubtargetInfo &STI) {
-  return new MipsInstPrinter(MAI);
+  return new MipsInstPrinter(MAI, MRI);
 }
 
 static MCStreamer *createMCStreamer(const Target &T, StringRef TT,
diff --git a/lib/Target/PTX/InstPrinter/PTXInstPrinter.cpp b/lib/Target/PTX/InstPrinter/PTXInstPrinter.cpp
index 815c503..ec7e2a7 100644
--- a/lib/Target/PTX/InstPrinter/PTXInstPrinter.cpp
+++ b/lib/Target/PTX/InstPrinter/PTXInstPrinter.cpp
@@ -27,8 +27,9 @@
 #include "PTXGenAsmWriter.inc"
 
 PTXInstPrinter::PTXInstPrinter(const MCAsmInfo &MAI,
+                               const MCRegisterInfo &MRI,
                                const MCSubtargetInfo &STI) :
-  MCInstPrinter(MAI) {
+  MCInstPrinter(MAI, MRI) {
   // Initialize the set of available features.
   setAvailableFeatures(STI.getFeatureBits());
 }
diff --git a/lib/Target/PTX/InstPrinter/PTXInstPrinter.h b/lib/Target/PTX/InstPrinter/PTXInstPrinter.h
index 8c74097..eef6101 100644
--- a/lib/Target/PTX/InstPrinter/PTXInstPrinter.h
+++ b/lib/Target/PTX/InstPrinter/PTXInstPrinter.h
@@ -23,7 +23,8 @@
 
 class PTXInstPrinter : public MCInstPrinter {
 public:
-  PTXInstPrinter(const MCAsmInfo &MAI, const MCSubtargetInfo &STI);
+  PTXInstPrinter(const MCAsmInfo &MAI, const MCRegisterInfo &MRI,
+                 const MCSubtargetInfo &STI);
 
   virtual void printInst(const MCInst *MI, raw_ostream &O, StringRef Annot);
   virtual StringRef getOpcodeName(unsigned Opcode) const;
diff --git a/lib/Target/PTX/MCTargetDesc/PTXMCTargetDesc.cpp b/lib/Target/PTX/MCTargetDesc/PTXMCTargetDesc.cpp
index 035952e..7671b11 100644
--- a/lib/Target/PTX/MCTargetDesc/PTXMCTargetDesc.cpp
+++ b/lib/Target/PTX/MCTargetDesc/PTXMCTargetDesc.cpp
@@ -62,9 +62,10 @@
 static MCInstPrinter *createPTXMCInstPrinter(const Target &T,
                                              unsigned SyntaxVariant,
                                              const MCAsmInfo &MAI,
+                                             const MCRegisterInfo &MRI,
                                              const MCSubtargetInfo &STI) {
   assert(SyntaxVariant == 0 && "We only have one syntax variant");
-  return new PTXInstPrinter(MAI, STI);
+  return new PTXInstPrinter(MAI, MRI, STI);
 }
 
 extern "C" void LLVMInitializePTXTargetMC() {
diff --git a/lib/Target/PowerPC/InstPrinter/PPCInstPrinter.h b/lib/Target/PowerPC/InstPrinter/PPCInstPrinter.h
index 6863183..21fc733 100644
--- a/lib/Target/PowerPC/InstPrinter/PPCInstPrinter.h
+++ b/lib/Target/PowerPC/InstPrinter/PPCInstPrinter.h
@@ -24,8 +24,9 @@
   // 0 -> AIX, 1 -> Darwin.
   unsigned SyntaxVariant;
 public:
-  PPCInstPrinter(const MCAsmInfo &MAI, unsigned syntaxVariant)
-    : MCInstPrinter(MAI), SyntaxVariant(syntaxVariant) {}
+  PPCInstPrinter(const MCAsmInfo &MAI, const MCRegisterInfo &MRI,
+                 unsigned syntaxVariant)
+    : MCInstPrinter(MAI, MRI), SyntaxVariant(syntaxVariant) {}
   
   bool isDarwinSyntax() const {
     return SyntaxVariant == 1;
diff --git a/lib/Target/PowerPC/MCTargetDesc/PPCMCTargetDesc.cpp b/lib/Target/PowerPC/MCTargetDesc/PPCMCTargetDesc.cpp
index a46069f..226fbfe 100644
--- a/lib/Target/PowerPC/MCTargetDesc/PPCMCTargetDesc.cpp
+++ b/lib/Target/PowerPC/MCTargetDesc/PPCMCTargetDesc.cpp
@@ -108,8 +108,9 @@
 static MCInstPrinter *createPPCMCInstPrinter(const Target &T,
                                              unsigned SyntaxVariant,
                                              const MCAsmInfo &MAI,
+                                             const MCRegisterInfo &MRI,
                                              const MCSubtargetInfo &STI) {
-  return new PPCInstPrinter(MAI, SyntaxVariant);
+  return new PPCInstPrinter(MAI, MRI, SyntaxVariant);
 }
 
 extern "C" void LLVMInitializePowerPCTargetMC() {
diff --git a/lib/Target/X86/InstPrinter/X86ATTInstPrinter.cpp b/lib/Target/X86/InstPrinter/X86ATTInstPrinter.cpp
index 2edabf8..b7ccb4c 100644
--- a/lib/Target/X86/InstPrinter/X86ATTInstPrinter.cpp
+++ b/lib/Target/X86/InstPrinter/X86ATTInstPrinter.cpp
@@ -30,10 +30,6 @@
 #define PRINT_ALIAS_INSTR
 #include "X86GenAsmWriter.inc"
 
-X86ATTInstPrinter::X86ATTInstPrinter(const MCAsmInfo &MAI)
-  : MCInstPrinter(MAI) {
-}
-
 void X86ATTInstPrinter::printRegName(raw_ostream &OS,
                                      unsigned RegNo) const {
   OS << '%' << getRegisterName(RegNo);
diff --git a/lib/Target/X86/InstPrinter/X86ATTInstPrinter.h b/lib/Target/X86/InstPrinter/X86ATTInstPrinter.h
index 3d56bb3..ff94301 100644
--- a/lib/Target/X86/InstPrinter/X86ATTInstPrinter.h
+++ b/lib/Target/X86/InstPrinter/X86ATTInstPrinter.h
@@ -22,8 +22,9 @@
   
 class X86ATTInstPrinter : public MCInstPrinter {
 public:
-  X86ATTInstPrinter(const MCAsmInfo &MAI);
-  
+  X86ATTInstPrinter(const MCAsmInfo &MAI, const MCRegisterInfo &MRI)
+    : MCInstPrinter(MAI, MRI) {}
+
   virtual void printRegName(raw_ostream &OS, unsigned RegNo) const;
   virtual void printInst(const MCInst *MI, raw_ostream &OS, StringRef Annot);
   virtual StringRef getOpcodeName(unsigned Opcode) const;
diff --git a/lib/Target/X86/InstPrinter/X86IntelInstPrinter.h b/lib/Target/X86/InstPrinter/X86IntelInstPrinter.h
index 82839a2..ea1d38a 100644
--- a/lib/Target/X86/InstPrinter/X86IntelInstPrinter.h
+++ b/lib/Target/X86/InstPrinter/X86IntelInstPrinter.h
@@ -23,8 +23,8 @@
   
 class X86IntelInstPrinter : public MCInstPrinter {
 public:
-  X86IntelInstPrinter(const MCAsmInfo &MAI)
-    : MCInstPrinter(MAI) {}
+  X86IntelInstPrinter(const MCAsmInfo &MAI, const MCRegisterInfo &MRI)
+    : MCInstPrinter(MAI, MRI) {}
 
   virtual void printRegName(raw_ostream &OS, unsigned RegNo) const;
   virtual void printInst(const MCInst *MI, raw_ostream &OS, StringRef Annot);
diff --git a/lib/Target/X86/MCTargetDesc/X86MCTargetDesc.cpp b/lib/Target/X86/MCTargetDesc/X86MCTargetDesc.cpp
index 38c3401..efd18c7 100644
--- a/lib/Target/X86/MCTargetDesc/X86MCTargetDesc.cpp
+++ b/lib/Target/X86/MCTargetDesc/X86MCTargetDesc.cpp
@@ -474,11 +474,12 @@
 static MCInstPrinter *createX86MCInstPrinter(const Target &T,
                                              unsigned SyntaxVariant,
                                              const MCAsmInfo &MAI,
+                                             const MCRegisterInfo &MRI,
                                              const MCSubtargetInfo &STI) {
   if (SyntaxVariant == 0)
-    return new X86ATTInstPrinter(MAI);
+    return new X86ATTInstPrinter(MAI, MRI);
   if (SyntaxVariant == 1)
-    return new X86IntelInstPrinter(MAI);
+    return new X86IntelInstPrinter(MAI, MRI);
   return 0;
 }
 
diff --git a/tools/llvm-mc/Disassembler.cpp b/tools/llvm-mc/Disassembler.cpp
index 8114580..6793d7e 100644
--- a/tools/llvm-mc/Disassembler.cpp
+++ b/tools/llvm-mc/Disassembler.cpp
@@ -21,6 +21,7 @@
 #include "llvm/MC/MCDisassembler.h"
 #include "llvm/MC/MCInst.h"
 #include "llvm/MC/MCInstPrinter.h"
+#include "llvm/MC/MCRegisterInfo.h"
 #include "llvm/MC/MCSubtargetInfo.h"
 #include "llvm/ADT/OwningPtr.h"
 #include "llvm/ADT/Triple.h"
@@ -160,16 +161,22 @@
     errs() << "error: no subtarget info for target " << Triple << "\n";
     return -1;
   }
-  
+
   OwningPtr<const MCDisassembler> DisAsm(T.createMCDisassembler(*STI));
   if (!DisAsm) {
     errs() << "error: no disassembler for target " << Triple << "\n";
     return -1;
   }
 
+  OwningPtr<const MCRegisterInfo> MRI(T.createMCRegInfo(Triple));
+  if (!MRI) {
+    errs() << "error: no register info for target " << Triple << "\n";
+    return -1;
+  }
+
   int AsmPrinterVariant = AsmInfo->getAssemblerDialect();
   OwningPtr<MCInstPrinter> IP(T.createMCInstPrinter(AsmPrinterVariant,
-                                                    *AsmInfo, *STI));
+                                                    *AsmInfo, *MRI, *STI));
   if (!IP) {
     errs() << "error: no instruction printer for target " << Triple << '\n';
     return -1;
diff --git a/tools/llvm-mc/llvm-mc.cpp b/tools/llvm-mc/llvm-mc.cpp
index f2365c6..dc72974 100644
--- a/tools/llvm-mc/llvm-mc.cpp
+++ b/tools/llvm-mc/llvm-mc.cpp
@@ -416,7 +416,7 @@
   // FIXME: There is a bit of code duplication with addPassesToEmitFile.
   if (FileType == OFT_AssemblyFile) {
     MCInstPrinter *IP =
-      TheTarget->createMCInstPrinter(OutputAsmVariant, *MAI, *STI);
+      TheTarget->createMCInstPrinter(OutputAsmVariant, *MAI, *MRI, *STI);
     MCCodeEmitter *CE = 0;
     MCAsmBackend *MAB = 0;
     if (ShowEncoding) {
diff --git a/tools/llvm-objdump/MachODump.cpp b/tools/llvm-objdump/MachODump.cpp
index 272dedf..b9ea041 100644
--- a/tools/llvm-objdump/MachODump.cpp
+++ b/tools/llvm-objdump/MachODump.cpp
@@ -26,6 +26,7 @@
 #include "llvm/MC/MCInstrAnalysis.h"
 #include "llvm/MC/MCInstrDesc.h"
 #include "llvm/MC/MCInstrInfo.h"
+#include "llvm/MC/MCRegisterInfo.h"
 #include "llvm/MC/MCSubtargetInfo.h"
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/Debug.h"
@@ -257,9 +258,10 @@
   OwningPtr<const MCSubtargetInfo>
     STI(TheTarget->createMCSubtargetInfo(TripleName, "", ""));
   OwningPtr<const MCDisassembler> DisAsm(TheTarget->createMCDisassembler(*STI));
+  OwningPtr<const MCRegisterInfo> MRI(TheTarget->createMCRegInfo(TripleName));
   int AsmPrinterVariant = AsmInfo->getAssemblerDialect();
   OwningPtr<MCInstPrinter> IP(TheTarget->createMCInstPrinter(
-                              AsmPrinterVariant, *AsmInfo, *STI));
+                              AsmPrinterVariant, *AsmInfo, *MRI, *STI));
 
   if (!InstrAnalysis || !AsmInfo || !STI || !DisAsm || !IP) {
     errs() << "error: couldn't initialize disassembler for target "
diff --git a/tools/llvm-objdump/llvm-objdump.cpp b/tools/llvm-objdump/llvm-objdump.cpp
index e848d6b..deb4dd1 100644
--- a/tools/llvm-objdump/llvm-objdump.cpp
+++ b/tools/llvm-objdump/llvm-objdump.cpp
@@ -26,6 +26,7 @@
 #include "llvm/MC/MCDisassembler.h"
 #include "llvm/MC/MCInst.h"
 #include "llvm/MC/MCInstPrinter.h"
+#include "llvm/MC/MCRegisterInfo.h"
 #include "llvm/MC/MCSubtargetInfo.h"
 #include "llvm/Support/Casting.h"
 #include "llvm/Support/CommandLine.h"
@@ -246,9 +247,15 @@
       return;
     }
 
+    OwningPtr<const MCRegisterInfo> MRI(TheTarget->createMCRegInfo(TripleName));
+    if (!MRI) {
+      errs() << "error: no register info for target " << TripleName << "\n";
+      return;
+    }
+
     int AsmPrinterVariant = AsmInfo->getAssemblerDialect();
     OwningPtr<MCInstPrinter> IP(TheTarget->createMCInstPrinter(
-                                AsmPrinterVariant, *AsmInfo, *STI));
+                                AsmPrinterVariant, *AsmInfo, *MRI, *STI));
     if (!IP) {
       errs() << "error: no instruction printer for target " << TripleName
              << '\n';