diff --git a/include/llvm/MC/MCInstPrinter.h b/include/llvm/MC/MCInstPrinter.h
index d2ddc5bb42b..4839a83dba5 100644
--- a/include/llvm/MC/MCInstPrinter.h
+++ b/include/llvm/MC/MCInstPrinter.h
@@ -20,26 +20,23 @@ class StringRef;
 /// that converts an MCInst to valid target assembly syntax.
 class MCInstPrinter {
 protected:
-  /// O - The main stream to emit instruction text to.
-  raw_ostream &O;
-  
   /// CommentStream - a stream that comments can be emitted to if desired.
   /// Each comment must end with a newline.  This will be null if verbose
   /// assembly emission is disable.
   raw_ostream *CommentStream;
   const MCAsmInfo &MAI;
 public:
-  MCInstPrinter(raw_ostream &o, const MCAsmInfo &mai)
-    : O(o), CommentStream(0), MAI(mai) {}
+  MCInstPrinter(const MCAsmInfo &mai)
+    : CommentStream(0), MAI(mai) {}
   
   virtual ~MCInstPrinter();
 
   /// setCommentStream - Specify a stream to emit comments to.
   void setCommentStream(raw_ostream &OS) { CommentStream = &OS; }
   
-  /// printInst - Print the specified MCInst to the current raw_ostream.
+  /// printInst - Print the specified MCInst to the specified raw_ostream.
   ///
-  virtual void printInst(const MCInst *MI) = 0;
+  virtual void printInst(const MCInst *MI, raw_ostream &OS) = 0;
   
   /// getOpcodeName - Return the name of the specified opcode enum (e.g.
   /// "MOV32ri") or empty if we can't resolve it.
diff --git a/include/llvm/Target/TargetRegistry.h b/include/llvm/Target/TargetRegistry.h
index 6b6dad8185b..272205ab12e 100644
--- a/include/llvm/Target/TargetRegistry.h
+++ b/include/llvm/Target/TargetRegistry.h
@@ -71,8 +71,7 @@ namespace llvm {
     typedef MCDisassembler *(*MCDisassemblerCtorTy)(const Target &T);
     typedef MCInstPrinter *(*MCInstPrinterCtorTy)(const Target &T,
                                                   unsigned SyntaxVariant,
-                                                  const MCAsmInfo &MAI,
-                                                  raw_ostream &O);
+                                                  const MCAsmInfo &MAI);
     typedef MCCodeEmitter *(*CodeEmitterCtorTy)(const Target &T,
                                                 TargetMachine &TM,
                                                 MCContext &Ctx);
@@ -248,11 +247,10 @@ namespace llvm {
     }
 
     MCInstPrinter *createMCInstPrinter(unsigned SyntaxVariant,
-                                       const MCAsmInfo &MAI,
-                                       raw_ostream &O) const {
+                                       const MCAsmInfo &MAI) const {
       if (!MCInstPrinterCtorFn)
         return 0;
-      return MCInstPrinterCtorFn(*this, SyntaxVariant, MAI, O);
+      return MCInstPrinterCtorFn(*this, SyntaxVariant, MAI);
     }
 
 
diff --git a/lib/CodeGen/LLVMTargetMachine.cpp b/lib/CodeGen/LLVMTargetMachine.cpp
index 75e45efe4de..4b9095494da 100644
--- a/lib/CodeGen/LLVMTargetMachine.cpp
+++ b/lib/CodeGen/LLVMTargetMachine.cpp
@@ -128,7 +128,7 @@ bool LLVMTargetMachine::addPassesToEmitFile(PassManagerBase &PM,
   default: return true;
   case CGFT_AssemblyFile: {
     MCInstPrinter *InstPrinter =
-      getTarget().createMCInstPrinter(MAI.getAssemblerDialect(), MAI, Out);
+      getTarget().createMCInstPrinter(MAI.getAssemblerDialect(), MAI);
     AsmStreamer.reset(createAsmStreamer(*Context, Out,
                                         getTargetData()->isLittleEndian(),
                                         getVerboseAsm(), InstPrinter,
diff --git a/lib/MC/MCAsmStreamer.cpp b/lib/MC/MCAsmStreamer.cpp
index 757eaddcf2d..2c7e1c4c90d 100644
--- a/lib/MC/MCAsmStreamer.cpp
+++ b/lib/MC/MCAsmStreamer.cpp
@@ -635,7 +635,7 @@ void MCAsmStreamer::EmitInstruction(const MCInst &Inst) {
   
   // If we have an AsmPrinter, use that to print, otherwise print the MCInst.
   if (InstPrinter)
-    InstPrinter->printInst(&Inst);
+    InstPrinter->printInst(&Inst, OS);
   else
     Inst.print(OS, &MAI);
   EmitEOL();
diff --git a/lib/Target/ARM/AsmPrinter/ARMAsmPrinter.cpp b/lib/Target/ARM/AsmPrinter/ARMAsmPrinter.cpp
index 486ab00d664..feb2db8bb8e 100644
--- a/lib/Target/ARM/AsmPrinter/ARMAsmPrinter.cpp
+++ b/lib/Target/ARM/AsmPrinter/ARMAsmPrinter.cpp
@@ -1385,10 +1385,9 @@ void ARMAsmPrinter::printInstructionThroughMCStreamer(const MachineInstr *MI) {
 
 static MCInstPrinter *createARMMCInstPrinter(const Target &T,
                                              unsigned SyntaxVariant,
-                                             const MCAsmInfo &MAI,
-                                             raw_ostream &O) {
+                                             const MCAsmInfo &MAI) {
   if (SyntaxVariant == 0)
-    return new ARMInstPrinter(O, MAI, false);
+    return new ARMInstPrinter(MAI, false);
   return 0;
 }
 
diff --git a/lib/Target/ARM/AsmPrinter/ARMInstPrinter.cpp b/lib/Target/ARM/AsmPrinter/ARMInstPrinter.cpp
index f0fcafbf81f..ef5ead6e473 100644
--- a/lib/Target/ARM/AsmPrinter/ARMInstPrinter.cpp
+++ b/lib/Target/ARM/AsmPrinter/ARMInstPrinter.cpp
@@ -98,7 +98,7 @@ static unsigned NextReg(unsigned Reg) {
   }
 }
 
-void ARMInstPrinter::printInst(const MCInst *MI) {
+void ARMInstPrinter::printInst(const MCInst *MI, raw_ostream &O) {
   // Check for MOVs and print canonical forms, instead.
   if (MI->getOpcode() == ARM::MOVs) {
     const MCOperand &Dst = MI->getOperand(0);
diff --git a/lib/Target/ARM/AsmPrinter/ARMInstPrinter.h b/lib/Target/ARM/AsmPrinter/ARMInstPrinter.h
index c2b32c1352e..dd006fc52e7 100644
--- a/lib/Target/ARM/AsmPrinter/ARMInstPrinter.h
+++ b/lib/Target/ARM/AsmPrinter/ARMInstPrinter.h
@@ -22,10 +22,10 @@ namespace llvm {
 class ARMInstPrinter : public MCInstPrinter {
   bool VerboseAsm;
 public:
-  ARMInstPrinter(raw_ostream &O, const MCAsmInfo &MAI, bool verboseAsm)
-    : MCInstPrinter(O, MAI), VerboseAsm(verboseAsm) {}
+  ARMInstPrinter(const MCAsmInfo &MAI, bool verboseAsm)
+    : MCInstPrinter(MAI), VerboseAsm(verboseAsm) {}
 
-  virtual void printInst(const MCInst *MI);
+  virtual void printInst(const MCInst *MI, raw_ostream &O);
   
   // Autogenerated by tblgen.
   void printInstruction(const MCInst *MI, raw_ostream &O);
diff --git a/lib/Target/MSP430/AsmPrinter/MSP430AsmPrinter.cpp b/lib/Target/MSP430/AsmPrinter/MSP430AsmPrinter.cpp
index 5d5e2e2474c..f40299079eb 100644
--- a/lib/Target/MSP430/AsmPrinter/MSP430AsmPrinter.cpp
+++ b/lib/Target/MSP430/AsmPrinter/MSP430AsmPrinter.cpp
@@ -51,7 +51,7 @@ namespace {
     }
 
     void printMCInst(const MCInst *MI) {
-      MSP430InstPrinter(O, *MAI).printInstruction(MI, O);
+      MSP430InstPrinter(*MAI).printInstruction(MI, O);
     }
     void printOperand(const MachineInstr *MI, int OpNum,
                       const char* Modifier = 0);
@@ -191,10 +191,9 @@ void MSP430AsmPrinter::EmitInstruction(const MachineInstr *MI) {
 
 static MCInstPrinter *createMSP430MCInstPrinter(const Target &T,
                                                 unsigned SyntaxVariant,
-                                                const MCAsmInfo &MAI,
-                                                raw_ostream &O) {
+                                                const MCAsmInfo &MAI) {
   if (SyntaxVariant == 0)
-    return new MSP430InstPrinter(O, MAI);
+    return new MSP430InstPrinter(MAI);
   return 0;
 }
 
diff --git a/lib/Target/MSP430/AsmPrinter/MSP430InstPrinter.cpp b/lib/Target/MSP430/AsmPrinter/MSP430InstPrinter.cpp
index 6b99645d23d..c15d4085bc8 100644
--- a/lib/Target/MSP430/AsmPrinter/MSP430InstPrinter.cpp
+++ b/lib/Target/MSP430/AsmPrinter/MSP430InstPrinter.cpp
@@ -28,7 +28,7 @@ using namespace llvm;
 #include "MSP430GenAsmWriter.inc"
 #undef MachineInstr
 
-void MSP430InstPrinter::printInst(const MCInst *MI) {
+void MSP430InstPrinter::printInst(const MCInst *MI, raw_ostream &O) {
   printInstruction(MI, O);
 }
 
diff --git a/lib/Target/MSP430/AsmPrinter/MSP430InstPrinter.h b/lib/Target/MSP430/AsmPrinter/MSP430InstPrinter.h
index a802cd2bae3..f0e1ce22841 100644
--- a/lib/Target/MSP430/AsmPrinter/MSP430InstPrinter.h
+++ b/lib/Target/MSP430/AsmPrinter/MSP430InstPrinter.h
@@ -16,18 +16,15 @@
 
 #include "llvm/MC/MCInstPrinter.h"
 
-namespace llvm
-{
-
+namespace llvm {
   class MCOperand;
 
   class MSP430InstPrinter : public MCInstPrinter {
   public:
-    MSP430InstPrinter(raw_ostream &O, const MCAsmInfo &MAI) :
-      MCInstPrinter(O, MAI) {
+    MSP430InstPrinter(const MCAsmInfo &MAI) : MCInstPrinter(MAI) {
     }
 
-    virtual void printInst(const MCInst *MI);
+    virtual void printInst(const MCInst *MI, raw_ostream &O);
 
     // Autogenerated by tblgen.
     void printInstruction(const MCInst *MI, raw_ostream &O);
diff --git a/lib/Target/X86/AsmPrinter/X86ATTInstPrinter.cpp b/lib/Target/X86/AsmPrinter/X86ATTInstPrinter.cpp
index 93f3dc1eff0..0b64cb4f282 100644
--- a/lib/Target/X86/AsmPrinter/X86ATTInstPrinter.cpp
+++ b/lib/Target/X86/AsmPrinter/X86ATTInstPrinter.cpp
@@ -29,8 +29,8 @@ using namespace llvm;
 #include "X86GenAsmWriter.inc"
 #undef MachineInstr
 
-void X86ATTInstPrinter::printInst(const MCInst *MI) {
-  printInstruction(MI, O);
+void X86ATTInstPrinter::printInst(const MCInst *MI, raw_ostream &OS) {
+  printInstruction(MI, OS);
 }
 StringRef X86ATTInstPrinter::getOpcodeName(unsigned Opcode) const {
   return getInstructionName(Opcode);
diff --git a/lib/Target/X86/AsmPrinter/X86ATTInstPrinter.h b/lib/Target/X86/AsmPrinter/X86ATTInstPrinter.h
index 3450a057f83..8d5d50832d4 100644
--- a/lib/Target/X86/AsmPrinter/X86ATTInstPrinter.h
+++ b/lib/Target/X86/AsmPrinter/X86ATTInstPrinter.h
@@ -21,11 +21,10 @@ namespace llvm {
   
 class X86ATTInstPrinter : public MCInstPrinter {
 public:
-  X86ATTInstPrinter(raw_ostream &O, const MCAsmInfo &MAI)
-    : MCInstPrinter(O, MAI) {}
+  X86ATTInstPrinter(const MCAsmInfo &MAI) : MCInstPrinter(MAI) {}
 
   
-  virtual void printInst(const MCInst *MI);
+  virtual void printInst(const MCInst *MI, raw_ostream &OS);
   virtual StringRef getOpcodeName(unsigned Opcode) const;
 
   // Autogenerated by tblgen.
diff --git a/lib/Target/X86/AsmPrinter/X86AsmPrinter.cpp b/lib/Target/X86/AsmPrinter/X86AsmPrinter.cpp
index 5f758db9456..311908abe5c 100644
--- a/lib/Target/X86/AsmPrinter/X86AsmPrinter.cpp
+++ b/lib/Target/X86/AsmPrinter/X86AsmPrinter.cpp
@@ -636,12 +636,11 @@ void X86AsmPrinter::EmitEndOfAsmFile(Module &M) {
 
 static MCInstPrinter *createX86MCInstPrinter(const Target &T,
                                              unsigned SyntaxVariant,
-                                             const MCAsmInfo &MAI,
-                                             raw_ostream &O) {
+                                             const MCAsmInfo &MAI) {
   if (SyntaxVariant == 0)
-    return new X86ATTInstPrinter(O, MAI);
+    return new X86ATTInstPrinter(MAI);
   if (SyntaxVariant == 1)
-    return new X86IntelInstPrinter(O, MAI);
+    return new X86IntelInstPrinter(MAI);
   return 0;
 }
 
diff --git a/lib/Target/X86/AsmPrinter/X86IntelInstPrinter.cpp b/lib/Target/X86/AsmPrinter/X86IntelInstPrinter.cpp
index e12b1485730..7e0a9bb891f 100644
--- a/lib/Target/X86/AsmPrinter/X86IntelInstPrinter.cpp
+++ b/lib/Target/X86/AsmPrinter/X86IntelInstPrinter.cpp
@@ -28,8 +28,8 @@ using namespace llvm;
 #include "X86GenAsmWriter1.inc"
 #undef MachineInstr
 
-void X86IntelInstPrinter::printInst(const MCInst *MI) {
-  printInstruction(MI, O);
+void X86IntelInstPrinter::printInst(const MCInst *MI, raw_ostream &OS) {
+  printInstruction(MI, OS);
 }
 StringRef X86IntelInstPrinter::getOpcodeName(unsigned Opcode) const {
   return getInstructionName(Opcode);
diff --git a/lib/Target/X86/AsmPrinter/X86IntelInstPrinter.h b/lib/Target/X86/AsmPrinter/X86IntelInstPrinter.h
index c2d02745110..a0beeb202e7 100644
--- a/lib/Target/X86/AsmPrinter/X86IntelInstPrinter.h
+++ b/lib/Target/X86/AsmPrinter/X86IntelInstPrinter.h
@@ -22,10 +22,10 @@ namespace llvm {
   
 class X86IntelInstPrinter : public MCInstPrinter {
 public:
-  X86IntelInstPrinter(raw_ostream &O, const MCAsmInfo &MAI)
-    : MCInstPrinter(O, MAI) {}
+  X86IntelInstPrinter(const MCAsmInfo &MAI)
+    : MCInstPrinter(MAI) {}
   
-  virtual void printInst(const MCInst *MI);
+  virtual void printInst(const MCInst *MI, raw_ostream &OS);
   virtual StringRef getOpcodeName(unsigned Opcode) const;
   
   // Autogenerated by tblgen.
diff --git a/tools/edis/EDDisassembler.cpp b/tools/edis/EDDisassembler.cpp
index f2b2f915775..8729b4998fd 100644
--- a/tools/edis/EDDisassembler.cpp
+++ b/tools/edis/EDDisassembler.cpp
@@ -195,10 +195,7 @@ EDDisassembler::EDDisassembler(CPUKey &key) :
   
   InstString.reset(new std::string);
   InstStream.reset(new raw_string_ostream(*InstString));
-  
-  InstPrinter.reset(Tgt->createMCInstPrinter(syntaxVariant,
-                                                *AsmInfo,
-                                                *InstStream));
+  InstPrinter.reset(Tgt->createMCInstPrinter(syntaxVariant, *AsmInfo));
   
   if (!InstPrinter)
     return;
@@ -314,11 +311,10 @@ bool EDDisassembler::registerIsProgramCounter(unsigned registerID) {
   return (programCounters.find(registerID) != programCounters.end());
 }
 
-int EDDisassembler::printInst(std::string& str,
-                              MCInst& inst) {
+int EDDisassembler::printInst(std::string &str, MCInst &inst) {
   PrinterMutex.acquire();
   
-  InstPrinter->printInst(&inst);
+  InstPrinter->printInst(&inst, *InstStream);
   InstStream->flush();
   str = *InstString;
   InstString->clear();
diff --git a/tools/llvm-mc/Disassembler.cpp b/tools/llvm-mc/Disassembler.cpp
index 0caf539ac95..9fe07909284 100644
--- a/tools/llvm-mc/Disassembler.cpp
+++ b/tools/llvm-mc/Disassembler.cpp
@@ -48,8 +48,8 @@ public:
 }
 
 static bool PrintInsts(const MCDisassembler &DisAsm,
-                      MCInstPrinter &Printer, const ByteArrayTy &Bytes,
-                      SourceMgr &SM) {
+                       MCInstPrinter &Printer, const ByteArrayTy &Bytes,
+                       SourceMgr &SM) {
   // Wrap the vector in a MemoryObject.
   VectorMemoryObject memoryObject(Bytes);
   
@@ -62,7 +62,7 @@ static bool PrintInsts(const MCDisassembler &DisAsm,
     
     if (DisAsm.getInstruction(Inst, Size, memoryObject, Index, 
                                /*REMOVE*/ nulls())) {
-      Printer.printInst(&Inst);
+      Printer.printInst(&Inst, outs());
       outs() << "\n";
     }
     else {
@@ -92,7 +92,7 @@ int Disassembler::disassemble(const Target &T, const std::string &Triple,
     return -1;
   }
   
-  OwningPtr<MCInstPrinter> IP(T.createMCInstPrinter(0, *AsmInfo, outs()));
+  OwningPtr<MCInstPrinter> IP(T.createMCInstPrinter(0, *AsmInfo));
   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 6f1448b191a..be7e55d510d 100644
--- a/tools/llvm-mc/llvm-mc.cpp
+++ b/tools/llvm-mc/llvm-mc.cpp
@@ -290,7 +290,7 @@ static int AssembleInput(const char *ProgName) {
 
   if (FileType == OFT_AssemblyFile) {
     MCInstPrinter *IP =
-      TheTarget->createMCInstPrinter(OutputAsmVariant, *MAI, *Out);
+      TheTarget->createMCInstPrinter(OutputAsmVariant, *MAI);
     if (ShowEncoding)
       CE.reset(TheTarget->createCodeEmitter(*TM, Ctx));
     Str.reset(createAsmStreamer(Ctx, *Out,TM->getTargetData()->isLittleEndian(),