diff --git a/include/llvm/MC/MCDisassembler.h b/include/llvm/MC/MCDisassembler.h
index adcb88254e6..404b8aa9852 100644
--- a/include/llvm/MC/MCDisassembler.h
+++ b/include/llvm/MC/MCDisassembler.h
@@ -15,6 +15,7 @@
 namespace llvm {
   
 class MCInst;
+class MCSubtargetInfo;
 class MemoryObject;
 class raw_ostream;
 class MCContext;
@@ -54,7 +55,7 @@ public:
   };
 
   /// Constructor     - Performs initial setup for the disassembler.
-  MCDisassembler() : GetOpInfo(0), DisInfo(0), Ctx(0) {}
+  MCDisassembler(const MCSubtargetInfo &STI) : GetOpInfo(0), DisInfo(0), Ctx(0), STI(STI) {}
   
   virtual ~MCDisassembler();
   
@@ -98,6 +99,9 @@ private:
   // The assembly context for creating symbols and MCExprs in place of
   // immediate operands when there is symbolic information.
   MCContext *Ctx;
+protected:
+  // Subtarget information, for instruction decoding predicates if required.
+  const MCSubtargetInfo &STI;
 
 public:
   void setupForSymbolicDisassembly(LLVMOpInfoCallback getOpInfo,
diff --git a/include/llvm/Support/TargetRegistry.h b/include/llvm/Support/TargetRegistry.h
index 8c07461d087..45f249d7ed0 100644
--- a/include/llvm/Support/TargetRegistry.h
+++ b/include/llvm/Support/TargetRegistry.h
@@ -94,10 +94,12 @@ namespace llvm {
                                                   const MCAsmInfo &MAI);
     typedef MCTargetAsmParser *(*MCAsmParserCtorTy)(MCSubtargetInfo &STI,
                                                     MCAsmParser &P);
-    typedef MCDisassembler *(*MCDisassemblerCtorTy)(const Target &T);
+    typedef MCDisassembler *(*MCDisassemblerCtorTy)(const Target &T,
+                                                    const MCSubtargetInfo &STI);
     typedef MCInstPrinter *(*MCInstPrinterCtorTy)(const Target &T,
                                                   unsigned SyntaxVariant,
-                                                  const MCAsmInfo &MAI);
+                                                  const MCAsmInfo &MAI,
+                                                  const MCSubtargetInfo &STI);
     typedef MCCodeEmitter *(*MCCodeEmitterCtorTy)(const MCInstrInfo &II,
                                                   const MCSubtargetInfo &STI,
                                                   MCContext &Ctx);
@@ -373,17 +375,18 @@ namespace llvm {
       return AsmPrinterCtorFn(TM, Streamer);
     }
 
-    MCDisassembler *createMCDisassembler() const {
+    MCDisassembler *createMCDisassembler(const MCSubtargetInfo &STI) const {
       if (!MCDisassemblerCtorFn)
         return 0;
-      return MCDisassemblerCtorFn(*this);
+      return MCDisassemblerCtorFn(*this, STI);
     }
 
     MCInstPrinter *createMCInstPrinter(unsigned SyntaxVariant,
-                                       const MCAsmInfo &MAI) const {
+                                       const MCAsmInfo &MAI,
+                                       const MCSubtargetInfo &STI) const {
       if (!MCInstPrinterCtorFn)
         return 0;
-      return MCInstPrinterCtorFn(*this, SyntaxVariant, MAI);
+      return MCInstPrinterCtorFn(*this, SyntaxVariant, MAI, STI);
     }
 
 
diff --git a/lib/CodeGen/LLVMTargetMachine.cpp b/lib/CodeGen/LLVMTargetMachine.cpp
index f835f16ea3e..c68ae7db802 100644
--- a/lib/CodeGen/LLVMTargetMachine.cpp
+++ b/lib/CodeGen/LLVMTargetMachine.cpp
@@ -131,13 +131,14 @@ bool LLVMTargetMachine::addPassesToEmitFile(PassManagerBase &PM,
     Context->setAllowTemporaryLabels(false);
 
   const MCAsmInfo &MAI = *getMCAsmInfo();
+  const MCSubtargetInfo &STI = getSubtarget<MCSubtargetInfo>();
   OwningPtr<MCStreamer> AsmStreamer;
 
   switch (FileType) {
   default: return true;
   case CGFT_AssemblyFile: {
     MCInstPrinter *InstPrinter =
-      getTarget().createMCInstPrinter(MAI.getAssemblerDialect(), MAI);
+      getTarget().createMCInstPrinter(MAI.getAssemblerDialect(), MAI, STI);
 
     // Create a code emitter if asked to show the encoding.
     MCCodeEmitter *MCE = 0;
@@ -161,7 +162,6 @@ bool LLVMTargetMachine::addPassesToEmitFile(PassManagerBase &PM,
   case CGFT_ObjectFile: {
     // Create the code emitter for the target if it exists.  If not, .o file
     // emission fails.
-    const MCSubtargetInfo &STI = getSubtarget<MCSubtargetInfo>();
     MCCodeEmitter *MCE = getTarget().createMCCodeEmitter(*getInstrInfo(), STI,
                                                          *Context);
     MCAsmBackend *MAB = getTarget().createMCAsmBackend(getTargetTriple());
diff --git a/lib/MC/MCDisassembler/Disassembler.cpp b/lib/MC/MCDisassembler/Disassembler.cpp
index 603df94f99c..fd462f84c48 100644
--- a/lib/MC/MCDisassembler/Disassembler.cpp
+++ b/lib/MC/MCDisassembler/Disassembler.cpp
@@ -57,19 +57,23 @@ LLVMDisasmContextRef LLVMCreateDisasm(const char *TripleName, void *DisInfo,
   std::string FeaturesStr;
   std::string CPU;
 
+  const MCSubtargetInfo *STI = TheTarget->createMCSubtargetInfo(TripleName, CPU,
+                                                                FeaturesStr);
+  assert(STI && "Unable to create subtarget info!");
+
   // Set up the MCContext for creating symbols and MCExpr's.
   MCContext *Ctx = new MCContext(*MAI, *MRI, 0);
   assert(Ctx && "Unable to create MCContext!");
 
   // Set up disassembler.
-  MCDisassembler *DisAsm = TheTarget->createMCDisassembler();
+  MCDisassembler *DisAsm = TheTarget->createMCDisassembler(*STI);
   assert(DisAsm && "Unable to create disassembler!");
   DisAsm->setupForSymbolicDisassembly(GetOpInfo, DisInfo, Ctx);
 
   // Set up the instruction printer.
   int AsmPrinterVariant = MAI->getAssemblerDialect();
   MCInstPrinter *IP = TheTarget->createMCInstPrinter(AsmPrinterVariant,
-                                                     *MAI);
+                                                     *MAI, *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 68a201b96a9..70b6300d74b 100644
--- a/lib/MC/MCDisassembler/EDDisassembler.cpp
+++ b/lib/MC/MCDisassembler/EDDisassembler.cpp
@@ -178,7 +178,12 @@ EDDisassembler::EDDisassembler(CPUKey &key) :
   if (!AsmInfo)
     return;
 
-  Disassembler.reset(Tgt->createMCDisassembler());
+  STI.reset(Tgt->createMCSubtargetInfo(tripleString, "", ""));
+  
+  if (!STI)
+    return;
+
+  Disassembler.reset(Tgt->createMCDisassembler(*STI));
   
   if (!Disassembler)
     return;
@@ -187,7 +192,7 @@ EDDisassembler::EDDisassembler(CPUKey &key) :
   
   InstString.reset(new std::string);
   InstStream.reset(new raw_string_ostream(*InstString));
-  InstPrinter.reset(Tgt->createMCInstPrinter(LLVMSyntaxVariant, *AsmInfo));
+  InstPrinter.reset(Tgt->createMCInstPrinter(LLVMSyntaxVariant, *AsmInfo, *STI));
   
   if (!InstPrinter)
     return;
diff --git a/lib/MC/MCDisassembler/EDDisassembler.h b/lib/MC/MCDisassembler/EDDisassembler.h
index 954a98d66d4..38c22038c51 100644
--- a/lib/MC/MCDisassembler/EDDisassembler.h
+++ b/lib/MC/MCDisassembler/EDDisassembler.h
@@ -137,6 +137,8 @@ struct EDDisassembler {
   const llvm::Target *Tgt;
   /// The assembly information for the target architecture
   llvm::OwningPtr<const llvm::MCAsmInfo> AsmInfo;
+  /// The subtarget information for the target architecture
+  llvm::OwningPtr<const llvm::MCSubtargetInfo> STI;
   // The register information for the target architecture.
   llvm::OwningPtr<const llvm::MCRegisterInfo> MRI;
   /// The disassembler for the target architecture
diff --git a/lib/Target/ARM/Disassembler/ARMDisassembler.cpp b/lib/Target/ARM/Disassembler/ARMDisassembler.cpp
index 4d646298b4b..cd0e5e44fdd 100644
--- a/lib/Target/ARM/Disassembler/ARMDisassembler.cpp
+++ b/lib/Target/ARM/Disassembler/ARMDisassembler.cpp
@@ -11,6 +11,7 @@
 
 #include "ARM.h"
 #include "ARMRegisterInfo.h"
+#include "ARMSubtarget.h"
 #include "MCTargetDesc/ARMAddressingModes.h"
 #include "MCTargetDesc/ARMBaseInfo.h"
 #include "llvm/MC/EDInstInfo.h"
@@ -34,8 +35,8 @@ class ARMDisassembler : public MCDisassembler {
 public:
   /// Constructor     - Initializes the disassembler.
   ///
-  ARMDisassembler() :
-    MCDisassembler() {
+  ARMDisassembler(const MCSubtargetInfo &STI) :
+    MCDisassembler(STI) {
   }
 
   ~ARMDisassembler() {
@@ -58,8 +59,8 @@ class ThumbDisassembler : public MCDisassembler {
 public:
   /// Constructor     - Initializes the disassembler.
   ///
-  ThumbDisassembler() :
-    MCDisassembler() {
+  ThumbDisassembler(const MCSubtargetInfo &STI) :
+    MCDisassembler(STI) {
   }
 
   ~ThumbDisassembler() {
@@ -296,12 +297,12 @@ static DecodeStatus DecodeIT(llvm::MCInst &Inst, unsigned Val,
 #include "ARMGenInstrInfo.inc"
 #include "ARMGenEDInfo.inc"
 
-static MCDisassembler *createARMDisassembler(const Target &T) {
-  return new ARMDisassembler;
+static MCDisassembler *createARMDisassembler(const Target &T, const MCSubtargetInfo &STI) {
+  return new ARMDisassembler(STI);
 }
 
-static MCDisassembler *createThumbDisassembler(const Target &T) {
-  return new ThumbDisassembler;
+static MCDisassembler *createThumbDisassembler(const Target &T, const MCSubtargetInfo &STI) {
+  return new ThumbDisassembler(STI);
 }
 
 EDInstInfo *ARMDisassembler::getEDInfo() const {
diff --git a/lib/Target/ARM/InstPrinter/ARMInstPrinter.cpp b/lib/Target/ARM/InstPrinter/ARMInstPrinter.cpp
index c421f1cda46..643bf4a3ec5 100644
--- a/lib/Target/ARM/InstPrinter/ARMInstPrinter.cpp
+++ b/lib/Target/ARM/InstPrinter/ARMInstPrinter.cpp
@@ -35,6 +35,14 @@ static unsigned translateShiftImm(unsigned imm) {
   return imm;
 }
 
+
+ARMInstPrinter::ARMInstPrinter(const MCAsmInfo &MAI,
+                               const MCSubtargetInfo &STI) :
+  MCInstPrinter(MAI) {
+  // Initialize the set of available features.
+  setAvailableFeatures(STI.getFeatureBits());
+}
+
 StringRef ARMInstPrinter::getOpcodeName(unsigned Opcode) const {
   return getInstructionName(Opcode);
 }
diff --git a/lib/Target/ARM/InstPrinter/ARMInstPrinter.h b/lib/Target/ARM/InstPrinter/ARMInstPrinter.h
index e68a6290fe5..5bde1581afc 100644
--- a/lib/Target/ARM/InstPrinter/ARMInstPrinter.h
+++ b/lib/Target/ARM/InstPrinter/ARMInstPrinter.h
@@ -15,6 +15,7 @@
 #define ARMINSTPRINTER_H
 
 #include "llvm/MC/MCInstPrinter.h"
+#include "llvm/MC/MCSubtargetInfo.h"
 
 namespace llvm {
 
@@ -22,8 +23,7 @@ class MCOperand;
 
 class ARMInstPrinter : public MCInstPrinter {
 public:
-  ARMInstPrinter(const MCAsmInfo &MAI)
-    : MCInstPrinter(MAI) {}
+    ARMInstPrinter(const MCAsmInfo &MAI, const MCSubtargetInfo &STI);
 
   virtual void printInst(const MCInst *MI, raw_ostream &O);
   virtual StringRef getOpcodeName(unsigned Opcode) const;
diff --git a/lib/Target/ARM/MCTargetDesc/ARMMCTargetDesc.cpp b/lib/Target/ARM/MCTargetDesc/ARMMCTargetDesc.cpp
index 1c7e75ec488..9badf937825 100644
--- a/lib/Target/ARM/MCTargetDesc/ARMMCTargetDesc.cpp
+++ b/lib/Target/ARM/MCTargetDesc/ARMMCTargetDesc.cpp
@@ -164,9 +164,10 @@ static MCStreamer *createMCStreamer(const Target &T, StringRef TT,
 
 static MCInstPrinter *createARMMCInstPrinter(const Target &T,
                                              unsigned SyntaxVariant,
-                                             const MCAsmInfo &MAI) {
+                                             const MCAsmInfo &MAI,
+                                             const MCSubtargetInfo &STI) {
   if (SyntaxVariant == 0)
-    return new ARMInstPrinter(MAI);
+    return new ARMInstPrinter(MAI, STI);
   return 0;
 }
 
diff --git a/lib/Target/MBlaze/Disassembler/MBlazeDisassembler.cpp b/lib/Target/MBlaze/Disassembler/MBlazeDisassembler.cpp
index 46f980c3f51..999080a5b04 100644
--- a/lib/Target/MBlaze/Disassembler/MBlazeDisassembler.cpp
+++ b/lib/Target/MBlaze/Disassembler/MBlazeDisassembler.cpp
@@ -696,8 +696,9 @@ MCDisassembler::DecodeStatus MBlazeDisassembler::getInstruction(MCInst &instr,
   return Success;
 }
 
-static MCDisassembler *createMBlazeDisassembler(const Target &T) {
-  return new MBlazeDisassembler;
+static MCDisassembler *createMBlazeDisassembler(const Target &T,
+                                                const MCSubtargetInfo &STI) {
+  return new MBlazeDisassembler(STI);
 }
 
 extern "C" void LLVMInitializeMBlazeDisassembler() {
diff --git a/lib/Target/MBlaze/Disassembler/MBlazeDisassembler.h b/lib/Target/MBlaze/Disassembler/MBlazeDisassembler.h
index b839a696d6a..3d689dbcfea 100644
--- a/lib/Target/MBlaze/Disassembler/MBlazeDisassembler.h
+++ b/lib/Target/MBlaze/Disassembler/MBlazeDisassembler.h
@@ -32,8 +32,8 @@ class MBlazeDisassembler : public MCDisassembler {
 public:
   /// Constructor     - Initializes the disassembler.
   ///
-  MBlazeDisassembler() :
-    MCDisassembler() {
+  MBlazeDisassembler(const MCSubtargetInfo &STI) :
+    MCDisassembler(STI) {
   }
 
   ~MBlazeDisassembler() {
diff --git a/lib/Target/MBlaze/MCTargetDesc/MBlazeMCTargetDesc.cpp b/lib/Target/MBlaze/MCTargetDesc/MBlazeMCTargetDesc.cpp
index 53cf712a1ef..43ae281519c 100644
--- a/lib/Target/MBlaze/MCTargetDesc/MBlazeMCTargetDesc.cpp
+++ b/lib/Target/MBlaze/MCTargetDesc/MBlazeMCTargetDesc.cpp
@@ -95,7 +95,8 @@ static MCStreamer *createMCStreamer(const Target &T, StringRef TT,
 
 static MCInstPrinter *createMBlazeMCInstPrinter(const Target &T,
                                                 unsigned SyntaxVariant,
-                                                const MCAsmInfo &MAI) {
+                                                const MCAsmInfo &MAI,
+                                                const MCSubtargetInfo &STI) {
   if (SyntaxVariant == 0)
     return new MBlazeInstPrinter(MAI);
   return 0;
diff --git a/lib/Target/MSP430/InstPrinter/MSP430InstPrinter.h b/lib/Target/MSP430/InstPrinter/MSP430InstPrinter.h
index 50d98b7c41f..82b342eccf7 100644
--- a/lib/Target/MSP430/InstPrinter/MSP430InstPrinter.h
+++ b/lib/Target/MSP430/InstPrinter/MSP430InstPrinter.h
@@ -22,7 +22,7 @@ namespace llvm {
   class MSP430InstPrinter : public MCInstPrinter {
   public:
     MSP430InstPrinter(const MCAsmInfo &MAI)
-      : MCInstPrinter(MAI) {}
+        : MCInstPrinter(MAI) {}
 
     virtual void printInst(const MCInst *MI, raw_ostream &O);
 
diff --git a/lib/Target/MSP430/MCTargetDesc/MSP430MCTargetDesc.cpp b/lib/Target/MSP430/MCTargetDesc/MSP430MCTargetDesc.cpp
index 3041c0e07be..fda70b81dc8 100644
--- a/lib/Target/MSP430/MCTargetDesc/MSP430MCTargetDesc.cpp
+++ b/lib/Target/MSP430/MCTargetDesc/MSP430MCTargetDesc.cpp
@@ -59,7 +59,8 @@ static MCCodeGenInfo *createMSP430MCCodeGenInfo(StringRef TT, Reloc::Model RM,
 
 static MCInstPrinter *createMSP430MCInstPrinter(const Target &T,
                                                 unsigned SyntaxVariant,
-                                                const MCAsmInfo &MAI) {
+                                                const MCAsmInfo &MAI,
+                                                const MCSubtargetInfo &STI) {
   if (SyntaxVariant == 0)
     return new MSP430InstPrinter(MAI);
   return 0;
diff --git a/lib/Target/Mips/MCTargetDesc/MipsMCTargetDesc.cpp b/lib/Target/Mips/MCTargetDesc/MipsMCTargetDesc.cpp
index 8272219ab51..7ea7498bcb2 100644
--- a/lib/Target/Mips/MCTargetDesc/MipsMCTargetDesc.cpp
+++ b/lib/Target/Mips/MCTargetDesc/MipsMCTargetDesc.cpp
@@ -78,7 +78,8 @@ static MCCodeGenInfo *createMipsMCCodeGenInfo(StringRef TT, Reloc::Model RM,
 
 static MCInstPrinter *createMipsMCInstPrinter(const Target &T,
                                               unsigned SyntaxVariant,
-                                              const MCAsmInfo &MAI) {
+                                              const MCAsmInfo &MAI,
+                                              const MCSubtargetInfo &STI) {
   return new MipsInstPrinter(MAI);
 }
 
diff --git a/lib/Target/PowerPC/MCTargetDesc/PPCMCTargetDesc.cpp b/lib/Target/PowerPC/MCTargetDesc/PPCMCTargetDesc.cpp
index 5099bc89331..d5c8a9e72c6 100644
--- a/lib/Target/PowerPC/MCTargetDesc/PPCMCTargetDesc.cpp
+++ b/lib/Target/PowerPC/MCTargetDesc/PPCMCTargetDesc.cpp
@@ -105,7 +105,8 @@ static MCStreamer *createMCStreamer(const Target &T, StringRef TT,
 
 static MCInstPrinter *createPPCMCInstPrinter(const Target &T,
                                              unsigned SyntaxVariant,
-                                             const MCAsmInfo &MAI) {
+                                             const MCAsmInfo &MAI,
+                                             const MCSubtargetInfo &STI) {
   return new PPCInstPrinter(MAI, SyntaxVariant);
 }
 
diff --git a/lib/Target/X86/Disassembler/X86Disassembler.cpp b/lib/Target/X86/Disassembler/X86Disassembler.cpp
index 46b70b71d7e..1f1c1dcd162 100644
--- a/lib/Target/X86/Disassembler/X86Disassembler.cpp
+++ b/lib/Target/X86/Disassembler/X86Disassembler.cpp
@@ -21,6 +21,7 @@
 #include "llvm/MC/MCDisassembler.h"
 #include "llvm/MC/MCDisassembler.h"
 #include "llvm/MC/MCInst.h"
+#include "llvm/MC/MCSubtargetInfo.h"
 #include "llvm/Support/Debug.h"
 #include "llvm/Support/MemoryObject.h"
 #include "llvm/Support/TargetRegistry.h"
@@ -66,8 +67,8 @@ extern Target TheX86_32Target, TheX86_64Target;
 static bool translateInstruction(MCInst &target,
                                 InternalInstruction &source);
 
-X86GenericDisassembler::X86GenericDisassembler(DisassemblerMode mode) :
-    MCDisassembler(),
+X86GenericDisassembler::X86GenericDisassembler(const MCSubtargetInfo &STI, DisassemblerMode mode) :
+    MCDisassembler(STI),
     fMode(mode) {
 }
 
@@ -578,12 +579,12 @@ static bool translateInstruction(MCInst &mcInst,
   return false;
 }
 
-static MCDisassembler *createX86_32Disassembler(const Target &T) {
-  return new X86Disassembler::X86_32Disassembler;
+static MCDisassembler *createX86_32Disassembler(const Target &T, const MCSubtargetInfo &STI) {
+  return new X86Disassembler::X86_32Disassembler(STI);
 }
 
-static MCDisassembler *createX86_64Disassembler(const Target &T) {
-  return new X86Disassembler::X86_64Disassembler;
+static MCDisassembler *createX86_64Disassembler(const Target &T, const MCSubtargetInfo &STI) {
+  return new X86Disassembler::X86_64Disassembler(STI);
 }
 
 extern "C" void LLVMInitializeX86Disassembler() { 
diff --git a/lib/Target/X86/Disassembler/X86Disassembler.h b/lib/Target/X86/Disassembler/X86Disassembler.h
index cced10e4a20..419b8703097 100644
--- a/lib/Target/X86/Disassembler/X86Disassembler.h
+++ b/lib/Target/X86/Disassembler/X86Disassembler.h
@@ -92,6 +92,7 @@ struct InternalInstruction;
 namespace llvm {
   
 class MCInst;
+class MCSubtargetInfo;
 class MemoryObject;
 class raw_ostream;
 
@@ -107,7 +108,7 @@ protected:
   /// Constructor     - Initializes the disassembler.
   ///
   /// @param mode     - The X86 architecture mode to decode for.
-  X86GenericDisassembler(DisassemblerMode mode);
+  X86GenericDisassembler(const MCSubtargetInfo &STI, DisassemblerMode mode);
 public:
   ~X86GenericDisassembler();
 
@@ -127,24 +128,24 @@ private:
 /// X86_16Disassembler - 16-bit X86 disassembler.
 class X86_16Disassembler : public X86GenericDisassembler {
 public:
-  X86_16Disassembler() :
-    X86GenericDisassembler(MODE_16BIT) {
+  X86_16Disassembler(const MCSubtargetInfo &STI) :
+    X86GenericDisassembler(STI, MODE_16BIT) {
   }
 };  
 
 /// X86_16Disassembler - 32-bit X86 disassembler.
 class X86_32Disassembler : public X86GenericDisassembler {
 public:
-  X86_32Disassembler() :
-    X86GenericDisassembler(MODE_32BIT) {
+  X86_32Disassembler(const MCSubtargetInfo &STI) :
+    X86GenericDisassembler(STI, MODE_32BIT) {
   }
 };
 
 /// X86_16Disassembler - 64-bit X86 disassembler.
 class X86_64Disassembler : public X86GenericDisassembler {
 public:
-  X86_64Disassembler() :
-    X86GenericDisassembler(MODE_64BIT) {
+  X86_64Disassembler(const MCSubtargetInfo &STI) :
+    X86GenericDisassembler(STI, MODE_64BIT) {
   }
 };
 
diff --git a/lib/Target/X86/MCTargetDesc/X86MCTargetDesc.cpp b/lib/Target/X86/MCTargetDesc/X86MCTargetDesc.cpp
index 06d8a920e3d..f98d5e331fe 100644
--- a/lib/Target/X86/MCTargetDesc/X86MCTargetDesc.cpp
+++ b/lib/Target/X86/MCTargetDesc/X86MCTargetDesc.cpp
@@ -394,7 +394,8 @@ static MCStreamer *createMCStreamer(const Target &T, StringRef TT,
 
 static MCInstPrinter *createX86MCInstPrinter(const Target &T,
                                              unsigned SyntaxVariant,
-                                             const MCAsmInfo &MAI) {
+                                             const MCAsmInfo &MAI,
+                                             const MCSubtargetInfo &STI) {
   if (SyntaxVariant == 0)
     return new X86ATTInstPrinter(MAI);
   if (SyntaxVariant == 1)
diff --git a/tools/llvm-mc/Disassembler.cpp b/tools/llvm-mc/Disassembler.cpp
index 33a9e8e2e5c..60384f6c63a 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/MCSubtargetInfo.h"
 #include "llvm/ADT/OwningPtr.h"
 #include "llvm/ADT/Triple.h"
 #include "llvm/ADT/Twine.h"
@@ -140,6 +141,8 @@ static bool ByteArrayFromString(ByteArrayTy &ByteArray,
 
 int Disassembler::disassemble(const Target &T,
                               const std::string &Triple,
+                              const std::string &Cpu,
+                              const std::string &FeaturesStr,
                               MemoryBuffer &Buffer,
                               raw_ostream &Out) {
   // Set up disassembler.
@@ -150,7 +153,13 @@ int Disassembler::disassemble(const Target &T,
     return -1;
   }
 
-  OwningPtr<const MCDisassembler> DisAsm(T.createMCDisassembler());
+  OwningPtr<const MCSubtargetInfo> STI(T.createMCSubtargetInfo(Triple, Cpu, FeaturesStr));
+  if (!STI) {
+    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;
@@ -158,7 +167,7 @@ int Disassembler::disassemble(const Target &T,
 
   int AsmPrinterVariant = AsmInfo->getAssemblerDialect();
   OwningPtr<MCInstPrinter> IP(T.createMCInstPrinter(AsmPrinterVariant,
-                                                    *AsmInfo));
+                                                    *AsmInfo, *STI));
   if (!IP) {
     errs() << "error: no instruction printer for target " << Triple << '\n';
     return -1;
diff --git a/tools/llvm-mc/Disassembler.h b/tools/llvm-mc/Disassembler.h
index 433e71bf278..e8cd92db030 100644
--- a/tools/llvm-mc/Disassembler.h
+++ b/tools/llvm-mc/Disassembler.h
@@ -27,6 +27,8 @@ class Disassembler {
 public:
   static int disassemble(const Target &target,
                          const std::string &tripleString,
+                         const std::string &Cpu,
+                         const std::string &FeaturesStr,
                          MemoryBuffer &buffer,
                          raw_ostream &Out);
 
diff --git a/tools/llvm-mc/llvm-mc.cpp b/tools/llvm-mc/llvm-mc.cpp
index 483e7d52a40..5fb3fdf5b5f 100644
--- a/tools/llvm-mc/llvm-mc.cpp
+++ b/tools/llvm-mc/llvm-mc.cpp
@@ -108,6 +108,12 @@ MCPU("mcpu",
      cl::value_desc("cpu-name"),
      cl::init(""));
 
+static cl::list<std::string>
+MAttrs("mattr",
+  cl::CommaSeparated,
+  cl::desc("Target specific attributes (-mattr=help for details)"),
+  cl::value_desc("a1,+a2,-a3,..."));
+
 static cl::opt<Reloc::Model>
 RelocModel("relocation-model",
              cl::desc("Choose relocation model"),
@@ -361,9 +367,6 @@ static int AssembleInput(const char *ProgName) {
   llvm::OwningPtr<MCRegisterInfo> MRI(TheTarget->createMCRegInfo(TripleName));
   assert(MRI && "Unable to create target register info!");
 
-  // Package up features to be passed to target/subtarget
-  std::string FeaturesStr;
-
   // FIXME: This is not pretty. MCContext has a ptr to MCObjectFileInfo and
   // MCObjectFileInfo needs a MCContext reference in order to initialize itself.
   OwningPtr<MCObjectFileInfo> MOFI(new MCObjectFileInfo());
@@ -373,6 +376,15 @@ static int AssembleInput(const char *ProgName) {
   if (SaveTempLabels)
     Ctx.setAllowTemporaryLabels(false);
 
+  // Package up features to be passed to target/subtarget
+  std::string FeaturesStr;
+  if (MAttrs.size()) {
+    SubtargetFeatures Features;
+    for (unsigned i = 0; i != MAttrs.size(); ++i)
+      Features.AddFeature(MAttrs[i]);
+    FeaturesStr = Features.getString();
+  }
+
   OwningPtr<tool_output_file> Out(GetOutputStream());
   if (!Out)
     return 1;
@@ -387,7 +399,7 @@ static int AssembleInput(const char *ProgName) {
   // FIXME: There is a bit of code duplication with addPassesToEmitFile.
   if (FileType == OFT_AssemblyFile) {
     MCInstPrinter *IP =
-      TheTarget->createMCInstPrinter(OutputAsmVariant, *MAI);
+      TheTarget->createMCInstPrinter(OutputAsmVariant, *MAI, *STI);
     MCCodeEmitter *CE = 0;
     MCAsmBackend *MAB = 0;
     if (ShowEncoding) {
@@ -453,7 +465,16 @@ static int DisassembleInput(const char *ProgName, bool Enhanced) {
     Res =
       Disassembler::disassembleEnhanced(TripleName, *Buffer.take(), Out->os());
   } else {
-    Res = Disassembler::disassemble(*TheTarget, TripleName,
+    // Package up features to be passed to target/subtarget
+    std::string FeaturesStr;
+    if (MAttrs.size()) {
+      SubtargetFeatures Features;
+      for (unsigned i = 0; i != MAttrs.size(); ++i)
+        Features.AddFeature(MAttrs[i]);
+      FeaturesStr = Features.getString();
+    }
+
+    Res = Disassembler::disassemble(*TheTarget, TripleName, MCPU, FeaturesStr,
                                     *Buffer.take(), Out->os());
   }
 
diff --git a/tools/llvm-objdump/llvm-objdump.cpp b/tools/llvm-objdump/llvm-objdump.cpp
index a8102f497ee..3d33eb774ce 100644
--- a/tools/llvm-objdump/llvm-objdump.cpp
+++ b/tools/llvm-objdump/llvm-objdump.cpp
@@ -25,6 +25,7 @@
 #include "llvm/MC/MCInstrAnalysis.h"
 #include "llvm/MC/MCInstrDesc.h"
 #include "llvm/MC/MCInstrInfo.h"
+#include "llvm/MC/MCSubtargetInfo.h"
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/Debug.h"
 #include "llvm/Support/Format.h"
@@ -217,7 +218,14 @@ static void DisassembleInput(const StringRef &Filename) {
       return;
     }
 
-    OwningPtr<const MCDisassembler> DisAsm(TheTarget->createMCDisassembler());
+    OwningPtr<const MCSubtargetInfo> STI(TheTarget->createMCSubtargetInfo(TripleName, "", ""));
+
+    if (!STI) {
+      errs() << "error: no subtarget info for target " << TripleName << "\n";
+      return;
+    }
+
+    OwningPtr<const MCDisassembler> DisAsm(TheTarget->createMCDisassembler(*STI));
     if (!DisAsm) {
       errs() << "error: no disassembler for target " << TripleName << "\n";
       return;
@@ -225,7 +233,7 @@ static void DisassembleInput(const StringRef &Filename) {
 
     int AsmPrinterVariant = AsmInfo->getAssemblerDialect();
     OwningPtr<MCInstPrinter> IP(TheTarget->createMCInstPrinter(
-                                  AsmPrinterVariant, *AsmInfo));
+                                AsmPrinterVariant, *AsmInfo, *STI));
     if (!IP) {
       errs() << "error: no instruction printer for target " << TripleName << '\n';
       return;