Starting to refactor Target to separate out code that's needed to fully describe

target machine from those that are only needed by codegen. The goal is to
sink the essential target description into MC layer so we can start building
MC based tools without needing to link in the entire codegen.

First step is to refactor TargetRegisterInfo. This patch added a base class
MCRegisterInfo which TargetRegisterInfo is derived from. Changed TableGen to
separate register description from the rest of the stuff.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@133782 91177308-0d34-0410-b5e6-96231b3b80d8

52 files changed, 502 insertions, 271 deletions

diff --git a/Makefile.rules b/Makefile.rules
index 98c72c0d05..2acadd8400 100644
--- a/Makefile.rules
+++ b/Makefile.rules
@@ -1725,15 +1725,20 @@ $(ObjDir)/%GenRegisterNames.inc.tmp : %.td $(ObjDir)/.dir
 	$(Echo) "Building $(<F) register names with tblgen"
 	$(Verb) $(TableGen) -gen-register-enums -o $(call SYSPATH, $@) $<
 
+$(TARGET:%=$(ObjDir)/%GenRegisterDesc.inc.tmp): \
+$(ObjDir)/%GenRegisterDesc.inc.tmp : %.td $(ObjDir)/.dir
+	$(Echo) "Building $(<F) register descriptions with tblgen"
+	$(Verb) $(TableGen) -gen-register-desc -o $(call SYSPATH, $@) $<
+
 $(TARGET:%=$(ObjDir)/%GenRegisterInfo.h.inc.tmp): \
 $(ObjDir)/%GenRegisterInfo.h.inc.tmp : %.td $(ObjDir)/.dir
 	$(Echo) "Building $(<F) register information header with tblgen"
-	$(Verb) $(TableGen) -gen-register-desc-header -o $(call SYSPATH, $@) $<
+	$(Verb) $(TableGen) -gen-register-info-header -o $(call SYSPATH, $@) $<
 
 $(TARGET:%=$(ObjDir)/%GenRegisterInfo.inc.tmp): \
 $(ObjDir)/%GenRegisterInfo.inc.tmp : %.td $(ObjDir)/.dir
 	$(Echo) "Building $(<F) register info implementation with tblgen"
-	$(Verb) $(TableGen) -gen-register-desc -o $(call SYSPATH, $@) $<
+	$(Verb) $(TableGen) -gen-register-info -o $(call SYSPATH, $@) $<
 
 $(TARGET:%=$(ObjDir)/%GenInstrNames.inc.tmp): \
 $(ObjDir)/%GenInstrNames.inc.tmp : %.td $(ObjDir)/.dir
diff --git a/include/llvm/MC/MCRegisterInfo.h b/include/llvm/MC/MCRegisterInfo.h
new file mode 100644
index 0000000000..30db84b762
--- /dev/null
+++ b/include/llvm/MC/MCRegisterInfo.h
@@ -0,0 +1,123 @@
+//=== MC/MCRegisterInfo.h - Target Register Description ---------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file describes an abstract interface used to get information about a
+// target machines register file.  This information is used for a variety of
+// purposed, especially register allocation.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_MC_MCREGISTERINFO_H
+#define LLVM_MC_MCREGISTERINFO_H
+
+#include <cassert>
+
+namespace llvm {
+
+/// TargetRegisterDesc - This record contains all of the information known about
+/// a particular register.  The Overlaps field contains a pointer to a zero
+/// terminated array of registers that this register aliases, starting with
+/// itself. This is needed for architectures like X86 which have AL alias AX
+/// alias EAX. The SubRegs field is a zero terminated array of registers that
+/// are sub-registers of the specific register, e.g. AL, AH are sub-registers of
+/// AX. The SuperRegs field is a zero terminated array of registers that are
+/// super-registers of the specific register, e.g. RAX, EAX, are super-registers
+/// of AX.
+///
+struct TargetRegisterDesc {
+  const char     *Name;         // Printable name for the reg (for debugging)
+  const unsigned *Overlaps;     // Overlapping registers, described above
+  const unsigned *SubRegs;      // Sub-register set, described above
+  const unsigned *SuperRegs;    // Super-register set, described above
+};
+
+/// MCRegisterInfo base class - We assume that the target defines a static
+/// array of TargetRegisterDesc objects that represent all of the machine
+/// registers that the target has.  As such, we simply have to track a pointer
+/// to this array so that we can turn register number into a register
+/// descriptor.
+///
+class MCRegisterInfo {
+private:
+  const TargetRegisterDesc *Desc;             // Pointer to the descriptor array
+  unsigned NumRegs;                           // Number of entries in the array
+
+public:
+  /// InitMCRegisterInfo - Initialize MCRegisterInfo, called by TableGen
+  /// auto-generated routines. *DO NOT USE*.
+  void InitMCRegisterInfo(const TargetRegisterDesc *D, unsigned NR) {
+    Desc = D;
+    NumRegs = NR;
+  }
+    
+  const TargetRegisterDesc &operator[](unsigned RegNo) const {
+    assert(RegNo < NumRegs &&
+           "Attempting to access record for invalid register number!");
+    return Desc[RegNo];
+  }
+
+  /// Provide a get method, equivalent to [], but more useful if we have a
+  /// pointer to this object.
+  ///
+  const TargetRegisterDesc &get(unsigned RegNo) const {
+    return operator[](RegNo);
+  }
+
+  /// getAliasSet - Return the set of registers aliased by the specified
+  /// register, or a null list of there are none.  The list returned is zero
+  /// terminated.
+  ///
+  const unsigned *getAliasSet(unsigned RegNo) const {
+    // The Overlaps set always begins with Reg itself.
+    return get(RegNo).Overlaps + 1;
+  }
+
+  /// getOverlaps - Return a list of registers that overlap Reg, including
+  /// itself. This is the same as the alias set except Reg is included in the
+  /// list.
+  /// These are exactly the registers in { x | regsOverlap(x, Reg) }.
+  ///
+  const unsigned *getOverlaps(unsigned RegNo) const {
+    return get(RegNo).Overlaps;
+  }
+
+  /// getSubRegisters - Return the list of registers that are sub-registers of
+  /// the specified register, or a null list of there are none. The list
+  /// returned is zero terminated and sorted according to super-sub register
+  /// relations. e.g. X86::RAX's sub-register list is EAX, AX, AL, AH.
+  ///
+  const unsigned *getSubRegisters(unsigned RegNo) const {
+    return get(RegNo).SubRegs;
+  }
+
+  /// getSuperRegisters - Return the list of registers that are super-registers
+  /// of the specified register, or a null list of there are none. The list
+  /// returned is zero terminated and sorted according to super-sub register
+  /// relations. e.g. X86::AL's super-register list is AX, EAX, RAX.
+  ///
+  const unsigned *getSuperRegisters(unsigned RegNo) const {
+    return get(RegNo).SuperRegs;
+  }
+
+  /// getName - Return the human-readable symbolic target-specific name for the
+  /// specified physical register.
+  const char *getName(unsigned RegNo) const {
+    return get(RegNo).Name;
+  }
+
+  /// getNumRegs - Return the number of registers this target has (useful for
+  /// sizing arrays holding per register information)
+  unsigned getNumRegs() const {
+    return NumRegs;
+  }
+};
+ 
+} // End llvm namespace
+
+#endif
diff --git a/include/llvm/Target/TargetRegisterInfo.h b/include/llvm/Target/TargetRegisterInfo.h
index 840b048704..d50bfe7eec 100644
--- a/include/llvm/Target/TargetRegisterInfo.h
+++ b/include/llvm/Target/TargetRegisterInfo.h
@@ -16,6 +16,7 @@
 #ifndef LLVM_TARGET_TARGETREGISTERINFO_H
 #define LLVM_TARGET_TARGETREGISTERINFO_H
 
+#include "llvm/MC/MCRegisterInfo.h"
 #include "llvm/CodeGen/MachineBasicBlock.h"
 #include "llvm/CodeGen/ValueTypes.h"
 #include "llvm/ADT/ArrayRef.h"
@@ -32,25 +33,6 @@ class RegScavenger;
 template<class T> class SmallVectorImpl;
 class raw_ostream;
 
-/// TargetRegisterDesc - This record contains all of the information known about
-/// a particular register.  The Overlaps field contains a pointer to a zero
-/// terminated array of registers that this register aliases, starting with
-/// itself. This is needed for architectures like X86 which have AL alias AX
-/// alias EAX. The SubRegs field is a zero terminated array of registers that
-/// are sub-registers of the specific register, e.g. AL, AH are sub-registers of
-/// AX. The SuperRegs field is a zero terminated array of registers that are
-/// super-registers of the specific register, e.g. RAX, EAX, are super-registers
-/// of AX.
-///
-struct TargetRegisterDesc {
-  const char     *Name;         // Printable name for the reg (for debugging)
-  const unsigned *Overlaps;     // Overlapping registers, described above
-  const unsigned *SubRegs;      // Sub-register set, described above
-  const unsigned *SuperRegs;    // Super-register set, described above
-  unsigned CostPerUse;          // Extra cost of instructions using register.
-  bool inAllocatableClass;      // Register belongs to an allocatable regclass.
-};
-
 class TargetRegisterClass {
 public:
   typedef const unsigned* iterator;
@@ -274,6 +256,12 @@ public:
   bool isAllocatable() const { return Allocatable; }
 };
 
+/// TargetRegisterInfoDesc - Extra information, not in MCRegisterDesc, about
+/// registers. These are used by codegen, not by MC.
+struct TargetRegisterInfoDesc {
+  unsigned CostPerUse;          // Extra cost of instructions using register.
+  bool inAllocatableClass;      // Register belongs to an allocatable regclass.
+};
 
 /// TargetRegisterInfo base class - We assume that the target defines a static
 /// array of TargetRegisterDesc objects that represent all of the machine
@@ -281,20 +269,17 @@ public:
 /// to this array so that we can turn register number into a register
 /// descriptor.
 ///
-class TargetRegisterInfo {
+class TargetRegisterInfo : public MCRegisterInfo {
 public:
   typedef const TargetRegisterClass * const * regclass_iterator;
 private:
-  const TargetRegisterDesc *Desc;             // Pointer to the descriptor array
+  const TargetRegisterInfoDesc *InfoDesc;     // Extra desc array for codegen
   const char *const *SubRegIndexNames;        // Names of subreg indexes.
-  unsigned NumRegs;                           // Number of entries in the array
-
   regclass_iterator RegClassBegin, RegClassEnd;   // List of regclasses
-
   int CallFrameSetupOpcode, CallFrameDestroyOpcode;
 
 protected:
-  TargetRegisterInfo(const TargetRegisterDesc *D, unsigned NR,
+  TargetRegisterInfo(const TargetRegisterInfoDesc *ID,
                      regclass_iterator RegClassBegin,
                      regclass_iterator RegClassEnd,
                      const char *const *subregindexnames,
@@ -379,71 +364,16 @@ public:
   BitVector getAllocatableSet(const MachineFunction &MF,
                               const TargetRegisterClass *RC = NULL) const;
 
-  const TargetRegisterDesc &operator[](unsigned RegNo) const {
-    assert(RegNo < NumRegs &&
-           "Attempting to access record for invalid register number!");
-    return Desc[RegNo];
-  }
-
-  /// Provide a get method, equivalent to [], but more useful if we have a
-  /// pointer to this object.
-  ///
-  const TargetRegisterDesc &get(unsigned RegNo) const {
-    return operator[](RegNo);
-  }
-
-  /// getAliasSet - Return the set of registers aliased by the specified
-  /// register, or a null list of there are none.  The list returned is zero
-  /// terminated.
-  ///
-  const unsigned *getAliasSet(unsigned RegNo) const {
-    // The Overlaps set always begins with Reg itself.
-    return get(RegNo).Overlaps + 1;
-  }
-
-  /// getOverlaps - Return a list of registers that overlap Reg, including
-  /// itself. This is the same as the alias set except Reg is included in the
-  /// list.
-  /// These are exactly the registers in { x | regsOverlap(x, Reg) }.
-  ///
-  const unsigned *getOverlaps(unsigned RegNo) const {
-    return get(RegNo).Overlaps;
-  }
-
-  /// getSubRegisters - Return the list of registers that are sub-registers of
-  /// the specified register, or a null list of there are none. The list
-  /// returned is zero terminated and sorted according to super-sub register
-  /// relations. e.g. X86::RAX's sub-register list is EAX, AX, AL, AH.
-  ///
-  const unsigned *getSubRegisters(unsigned RegNo) const {
-    return get(RegNo).SubRegs;
-  }
-
-  /// getSuperRegisters - Return the list of registers that are super-registers
-  /// of the specified register, or a null list of there are none. The list
-  /// returned is zero terminated and sorted according to super-sub register
-  /// relations. e.g. X86::AL's super-register list is AX, EAX, RAX.
-  ///
-  const unsigned *getSuperRegisters(unsigned RegNo) const {
-    return get(RegNo).SuperRegs;
-  }
-
-  /// getName - Return the human-readable symbolic target-specific name for the
-  /// specified physical register.
-  const char *getName(unsigned RegNo) const {
-    return get(RegNo).Name;
-  }
-
   /// getCostPerUse - Return the additional cost of using this register instead
   /// of other registers in its class.
   unsigned getCostPerUse(unsigned RegNo) const {
-    return get(RegNo).CostPerUse;
+    return InfoDesc[RegNo].CostPerUse;
   }
 
-  /// getNumRegs - Return the number of registers this target has (useful for
-  /// sizing arrays holding per register information)
-  unsigned getNumRegs() const {
-    return NumRegs;
+  /// isInAllocatableClass - Return true if the register is in the allocation
+  /// of any register class.
+  bool isInAllocatableClass(unsigned RegNo) const {
+    return InfoDesc[RegNo].inAllocatableClass;
   }
 
   /// getSubRegIndexName - Return the human-readable symbolic target-specific
diff --git a/include/llvm/Target/TargetRegistry.h b/include/llvm/Target/TargetRegistry.h
index a464822893..2e219011ab 100644
--- a/include/llvm/Target/TargetRegistry.h
+++ b/include/llvm/Target/TargetRegistry.h
@@ -33,6 +33,7 @@ namespace llvm {
   class MCContext;
   class MCDisassembler;
   class MCInstPrinter;
+  class MCRegisterInfo;
   class MCStreamer;
   class TargetAsmBackend;
   class TargetAsmLexer;
@@ -64,7 +65,9 @@ namespace llvm {
     typedef unsigned (*TripleMatchQualityFnTy)(const std::string &TT);
 
     typedef MCAsmInfo *(*AsmInfoCtorFnTy)(const Target &T,
-                                                StringRef TT);
+                                          StringRef TT);
+    typedef MCRegisterInfo *(*RegInfoCtorFnTy)(const Target &T,
+                                               StringRef TT);
     typedef TargetMachine *(*TargetMachineCtorTy)(const Target &T,
                                                   const std::string &TT,
                                                   const std::string &Features);
@@ -120,8 +123,14 @@ namespace llvm {
     /// HasJIT - Whether this target supports the JIT.
     bool HasJIT;
 
+    /// AsmInfoCtorFn - Constructor function for this target's MCAsmInfo, if
+    /// registered.
     AsmInfoCtorFnTy AsmInfoCtorFn;
 
+    /// RegInfoCtorFn - Constructor function for this target's MCRegisterInfo,
+    /// if registered.
+    RegInfoCtorFnTy RegInfoCtorFn;
+
     /// TargetMachineCtorFn - Construction function for this target's
     /// TargetMachine, if registered.
     TargetMachineCtorTy TargetMachineCtorFn;
@@ -231,6 +240,19 @@ namespace llvm {
       return AsmInfoCtorFn(*this, Triple);
     }
 
+    /// createRegInfo - Create a MCRegisterInfo implementation for the specified
+    /// target triple.
+    ///
+    /// \arg Triple - This argument is used to determine the target machine
+    /// feature set; it should always be provided. Generally this should be
+    /// either the target triple from the module, or the target triple of the
+    /// host if that does not exist.
+    MCRegisterInfo *createRegInfo(StringRef Triple) const {
+      if (!RegInfoCtorFn)
+        return 0;
+      return RegInfoCtorFn(*this, Triple);
+    }
+
     /// createTargetMachine - Create a target specific machine implementation
     /// for the specified \arg Triple.
     ///
@@ -444,6 +466,21 @@ namespace llvm {
         T.AsmInfoCtorFn = Fn;
     }
 
+    /// RegisterRegInfo - Register a MCRegisterInfo implementation for the
+    /// given target.
+    ///
+    /// Clients are responsible for ensuring that registration doesn't occur
+    /// while another thread is attempting to access the registry. Typically
+    /// this is done by initializing all targets at program startup.
+    ///
+    /// @param T - The target being registered.
+    /// @param Fn - A function to construct a MCRegisterInfo for the target.
+    static void RegisterRegInfo(Target &T, Target::RegInfoCtorFnTy Fn) {
+      // Ignore duplicate registration.
+      if (!T.RegInfoCtorFn)
+        T.RegInfoCtorFn = Fn;
+    }
+
     /// RegisterTargetMachine - Register a TargetMachine implementation for the
     /// given target.
     ///
diff --git a/lib/CodeGen/RegisterClassInfo.h b/lib/CodeGen/RegisterClassInfo.h
index 6f7d9c9496..d21fd67efe 100644
--- a/lib/CodeGen/RegisterClassInfo.h
+++ b/lib/CodeGen/RegisterClassInfo.h
@@ -112,7 +112,7 @@ public:
   /// register, so a register allocator needs to track its liveness and
   /// availability.
   bool isAllocatable(unsigned PhysReg) const {
-    return TRI->get(PhysReg).inAllocatableClass && !isReserved(PhysReg);
+    return TRI->isInAllocatableClass(PhysReg) && !isReserved(PhysReg);
   }
 };
 } // end namespace llvm
diff --git a/lib/Target/ARM/ARMBaseRegisterInfo.cpp b/lib/Target/ARM/ARMBaseRegisterInfo.cpp
index 9dc51b810e..0e74ac0cf1 100644
--- a/lib/Target/ARM/ARMBaseRegisterInfo.cpp
+++ b/lib/Target/ARM/ARMBaseRegisterInfo.cpp
@@ -39,6 +39,8 @@
 #include "llvm/ADT/BitVector.h"
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/Support/CommandLine.h"
+#include "ARMGenRegisterDesc.inc"
+#include "ARMGenRegisterInfo.inc"
 
 using namespace llvm;
 
@@ -54,7 +56,8 @@ EnableBasePointer("arm-use-base-pointer", cl::Hidden, cl::init(true),
 
 ARMBaseRegisterInfo::ARMBaseRegisterInfo(const ARMBaseInstrInfo &tii,
                                          const ARMSubtarget &sti)
-  : ARMGenRegisterInfo(ARM::ADJCALLSTACKDOWN, ARM::ADJCALLSTACKUP),
+  : ARMGenRegisterInfo(ARMRegDesc, ARMRegInfoDesc,
+                       ARM::ADJCALLSTACKDOWN, ARM::ADJCALLSTACKUP),
     TII(tii), STI(sti),
     FramePtr((STI.isTargetDarwin() || STI.isThumb()) ? ARM::R7 : ARM::R11),
     BasePtr(ARM::R6) {
@@ -1287,5 +1290,3 @@ ARMBaseRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II,
       MI.setDesc(TII.get(ARM::t2SUBri));
   }
 }
-
-#include "ARMGenRegisterInfo.inc"
diff --git a/lib/Target/ARM/CMakeLists.txt b/lib/Target/ARM/CMakeLists.txt
index edc0054468..6cb9689515 100644
--- a/lib/Target/ARM/CMakeLists.txt
+++ b/lib/Target/ARM/CMakeLists.txt
@@ -1,8 +1,9 @@
 set(LLVM_TARGET_DEFINITIONS ARM.td)
 
-tablegen(ARMGenRegisterInfo.h.inc -gen-register-desc-header)
 tablegen(ARMGenRegisterNames.inc -gen-register-enums)
-tablegen(ARMGenRegisterInfo.inc -gen-register-desc)
+tablegen(ARMGenRegisterDesc.inc -gen-register-desc)
+tablegen(ARMGenRegisterInfo.h.inc -gen-register-info-header)
+tablegen(ARMGenRegisterInfo.inc -gen-register-info)
 tablegen(ARMGenInstrNames.inc -gen-instr-enums)
 tablegen(ARMGenInstrInfo.inc -gen-instr-desc)
 tablegen(ARMGenCodeEmitter.inc -gen-emitter)
diff --git a/lib/Target/ARM/Makefile b/lib/Target/ARM/Makefile
index 65a6494986..0a425143dc 100644
--- a/lib/Target/ARM/Makefile
+++ b/lib/Target/ARM/Makefile
@@ -12,9 +12,10 @@ LIBRARYNAME = LLVMARMCodeGen
 TARGET = ARM
 
 # Make sure that tblgen is run, first thing.
-BUILT_SOURCES = ARMGenRegisterInfo.h.inc ARMGenRegisterNames.inc \
-                ARMGenRegisterInfo.inc ARMGenInstrNames.inc \
-                ARMGenInstrInfo.inc ARMGenAsmWriter.inc ARMGenAsmMatcher.inc \
+BUILT_SOURCES = ARMGenRegisterNames.inc ARMGenRegisterDesc.inc \
+                ARMGenRegisterInfo.h.inc ARMGenRegisterInfo.inc \
+		ARMGenInstrNames.inc ARMGenInstrInfo.inc \
+		ARMGenAsmWriter.inc ARMGenAsmMatcher.inc \
                 ARMGenDAGISel.inc ARMGenSubtarget.inc \
                 ARMGenCodeEmitter.inc ARMGenCallingConv.inc \
                 ARMGenDecoderTables.inc ARMGenEDInfo.inc \
diff --git a/lib/Target/Alpha/AlphaRegisterInfo.cpp b/lib/Target/Alpha/AlphaRegisterInfo.cpp
index d6c3809960..5ff846eca7 100644
--- a/lib/Target/Alpha/AlphaRegisterInfo.cpp
+++ b/lib/Target/Alpha/AlphaRegisterInfo.cpp
@@ -33,10 +33,13 @@
 #include "llvm/ADT/BitVector.h"
 #include "llvm/ADT/STLExtras.h"
 #include <cstdlib>
+#include "AlphaGenRegisterDesc.inc"
+#include "AlphaGenRegisterInfo.inc"
 using namespace llvm;
 
 AlphaRegisterInfo::AlphaRegisterInfo(const TargetInstrInfo &tii)
-  : AlphaGenRegisterInfo(Alpha::ADJUSTSTACKDOWN, Alpha::ADJUSTSTACKUP),
+  : AlphaGenRegisterInfo(AlphaRegDesc, AlphaRegInfoDesc,
+                         Alpha::ADJUSTSTACKDOWN, Alpha::ADJUSTSTACKUP),
     TII(tii) {
 }
 
@@ -204,10 +207,8 @@ int AlphaRegisterInfo::getLLVMRegNum(unsigned DwarfRegNum, bool isEH) const {
   return -1;
 }
 
-#include "AlphaGenRegisterInfo.inc"
-
 std::string AlphaRegisterInfo::getPrettyName(unsigned reg)
 {
-  std::string s(RegisterDescriptors[reg].Name);
+  std::string s(AlphaRegDesc[reg].Name);
   return s;
 }
diff --git a/lib/Target/Alpha/CMakeLists.txt b/lib/Target/Alpha/CMakeLists.txt
index 454262ad63..1834b06653 100644
--- a/lib/Target/Alpha/CMakeLists.txt
+++ b/lib/Target/Alpha/CMakeLists.txt
@@ -1,8 +1,9 @@
 set(LLVM_TARGET_DEFINITIONS Alpha.td)
 
-tablegen(AlphaGenRegisterInfo.h.inc -gen-register-desc-header)
 tablegen(AlphaGenRegisterNames.inc -gen-register-enums)
-tablegen(AlphaGenRegisterInfo.inc -gen-register-desc)
+tablegen(AlphaGenRegisterDesc.inc -gen-register-desc)
+tablegen(AlphaGenRegisterInfo.h.inc -gen-register-info-header)
+tablegen(AlphaGenRegisterInfo.inc -gen-register-info)
 tablegen(AlphaGenInstrNames.inc -gen-instr-enums)
 tablegen(AlphaGenInstrInfo.inc -gen-instr-desc)
 tablegen(AlphaGenAsmWriter.inc -gen-asm-writer)
diff --git a/lib/Target/Alpha/Makefile b/lib/Target/Alpha/Makefile
index 9564be680e..f029793d08 100644
--- a/lib/Target/Alpha/Makefile
+++ b/lib/Target/Alpha/Makefile
@@ -12,9 +12,9 @@ LIBRARYNAME = LLVMAlphaCodeGen
 TARGET = Alpha
 
 # Make sure that tblgen is run, first thing.
-BUILT_SOURCES = AlphaGenRegisterInfo.h.inc AlphaGenRegisterNames.inc \
-                AlphaGenRegisterInfo.inc AlphaGenInstrNames.inc \
-                AlphaGenInstrInfo.inc \
+BUILT_SOURCES = AlphaGenRegisterNames.inc AlphaGenRegisterDesc.inc \
+                AlphaGenRegisterInfo.h.inc AlphaGenRegisterInfo.inc \
+		AlphaGenInstrNames.inc AlphaGenInstrInfo.inc \
                 AlphaGenAsmWriter.inc AlphaGenDAGISel.inc \
                 AlphaGenCallingConv.inc AlphaGenSubtarget.inc
 
diff --git a/lib/Target/Blackfin/BlackfinRegisterInfo.cpp b/lib/Target/Blackfin/BlackfinRegisterInfo.cpp
index 6ca460ef80..6377d8e403 100644
--- a/lib/Target/Blackfin/BlackfinRegisterInfo.cpp
+++ b/lib/Target/Blackfin/BlackfinRegisterInfo.cpp
@@ -29,11 +29,14 @@
 #include "llvm/Type.h"
 #include "llvm/ADT/BitVector.h"
 #include "llvm/ADT/STLExtras.h"
+#include "BlackfinGenRegisterDesc.inc"
+#include "BlackfinGenRegisterInfo.inc"
 using namespace llvm;
 
 BlackfinRegisterInfo::BlackfinRegisterInfo(BlackfinSubtarget &st,
                                            const TargetInstrInfo &tii)
-  : BlackfinGenRegisterInfo(BF::ADJCALLSTACKDOWN, BF::ADJCALLSTACKUP),
+  : BlackfinGenRegisterInfo(BlackfinRegDesc, BlackfinRegInfoDesc,
+                            BF::ADJCALLSTACKDOWN, BF::ADJCALLSTACKUP),
     Subtarget(st),
     TII(tii) {}
 
@@ -356,6 +359,3 @@ int BlackfinRegisterInfo::getLLVMRegNum(unsigned DwarfRegNum,
   llvm_unreachable("What is the dwarf register number");
   return -1;
 }
-
-#include "BlackfinGenRegisterInfo.inc"
-
diff --git a/lib/Target/Blackfin/CMakeLists.txt b/lib/Target/Blackfin/CMakeLists.txt
index a47299ff16..10896c5864 100644
--- a/lib/Target/Blackfin/CMakeLists.txt
+++ b/lib/Target/Blackfin/CMakeLists.txt
@@ -1,8 +1,9 @@
 set(LLVM_TARGET_DEFINITIONS Blackfin.td)
 
-tablegen(BlackfinGenRegisterInfo.h.inc -gen-register-desc-header)
 tablegen(BlackfinGenRegisterNames.inc -gen-register-enums)
-tablegen(BlackfinGenRegisterInfo.inc -gen-register-desc)
+tablegen(BlackfinGenRegisterDesc.inc -gen-register-desc)
+tablegen(BlackfinGenRegisterInfo.h.inc -gen-register-info-header)
+tablegen(BlackfinGenRegisterInfo.inc -gen-register-info)
 tablegen(BlackfinGenInstrNames.inc -gen-instr-enums)
 tablegen(BlackfinGenInstrInfo.inc -gen-instr-desc)
 tablegen(BlackfinGenAsmWriter.inc -gen-asm-writer)
diff --git a/lib/Target/Blackfin/Makefile b/lib/Target/Blackfin/Makefile
index 5eb8e9a992..8ea1dfb067 100644
--- a/lib/Target/Blackfin/Makefile
+++ b/lib/Target/Blackfin/Makefile
@@ -12,8 +12,9 @@ LIBRARYNAME = LLVMBlackfinCodeGen
 TARGET = Blackfin
 
 # Make sure that tblgen is run, first thing.
-BUILT_SOURCES = BlackfinGenRegisterInfo.h.inc BlackfinGenRegisterNames.inc \
-                BlackfinGenRegisterInfo.inc BlackfinGenInstrNames.inc \
+BUILT_SOURCES = BlackfinGenRegisterNames.inc BlackfinGenRegisterDesc.inc \
+		BlackfinGenRegisterInfo.h.inc BlackfinGenRegisterInfo.inc \
+		BlackfinGenInstrNames.inc \
                 BlackfinGenInstrInfo.inc BlackfinGenAsmWriter.inc \
                 BlackfinGenDAGISel.inc BlackfinGenSubtarget.inc \
 		BlackfinGenCallingConv.inc BlackfinGenIntrinsics.inc
diff --git a/lib/Target/CellSPU/Makefile b/lib/Target/CellSPU/Makefile
index 77c66be9e8..de8a9476d1 100644
--- a/lib/Target/CellSPU/Makefile
+++ b/lib/Target/CellSPU/Makefile
@@ -10,8 +10,9 @@
 LEVEL = ../../..
 LIBRARYNAME = LLVMCellSPUCodeGen
 TARGET = SPU
-BUILT_SOURCES = SPUGenInstrNames.inc SPUGenRegisterNames.inc \
+BUILT_SOURCES = SPUGenInstrNames.inc \
 		SPUGenAsmWriter.inc SPUGenCodeEmitter.inc \
+		SPUGenRegisterNames.inc SPUGenRegisterDesc.inc \
 		SPUGenRegisterInfo.h.inc SPUGenRegisterInfo.inc \
 		SPUGenInstrInfo.inc SPUGenDAGISel.inc \
 		SPUGenSubtarget.inc SPUGenCallingConv.inc
diff --git a/lib/Target/CellSPU/SPURegisterInfo.cpp b/lib/Target/CellSPU/SPURegisterInfo.cpp
index 623ae76326..34f3f9b1ad 100644
--- a/lib/Target/CellSPU/SPURegisterInfo.cpp
+++ b/lib/Target/CellSPU/SPURegisterInfo.cpp
@@ -42,6 +42,8 @@
 #include "llvm/ADT/BitVector.h"
 #include "llvm/ADT/STLExtras.h"
 #include <cstdlib>
+#include "SPUGenRegisterDesc.inc"
+#include "SPUGenRegisterInfo.inc"
 
 using namespace llvm;
 
@@ -185,7 +187,8 @@ unsigned SPURegisterInfo::getRegisterNumbering(unsigned RegEnum) {
 
 SPURegisterInfo::SPURegisterInfo(const SPUSubtarget &subtarget,
                                  const TargetInstrInfo &tii) :
-  SPUGenRegisterInfo(SPU::ADJCALLSTACKDOWN, SPU::ADJCALLSTACKUP),
+  SPUGenRegisterInfo(SPURegDesc, SPURegInfoDesc,
+                     SPU::ADJCALLSTACKDOWN, SPU::ADJCALLSTACKUP),
   Subtarget(subtarget),
   TII(tii)
 {
@@ -371,5 +374,3 @@ SPURegisterInfo::findScratchRegister(MachineBasicBlock::iterator II,
   assert( Reg && "Register scavenger failed");
   return Reg;
 }
-
-#include "SPUGenRegisterInfo.inc"
diff --git a/lib/Target/MBlaze/CMakeLists.txt b/lib/Target/MBlaze/CMakeLists.txt
index 004057ad4a..009564e9ab 100644
--- a/lib/Target/MBlaze/CMakeLists.txt
+++ b/lib/Target/MBlaze/CMakeLists.txt
@@ -1,8 +1,9 @@
 set(LLVM_TARGET_DEFINITIONS MBlaze.td)
 
-tablegen(MBlazeGenRegisterInfo.h.inc -gen-register-desc-header)
 tablegen(MBlazeGenRegisterNames.inc -gen-register-enums)
-tablegen(MBlazeGenRegisterInfo.inc -gen-register-desc)
+tablegen(MBlazeGenRegisterDesc.inc -gen-register-desc)
+tablegen(MBlazeGenRegisterInfo.h.inc -gen-register-info-header)
+tablegen(MBlazeGenRegisterInfo.inc -gen-register-info)
 tablegen(MBlazeGenInstrNames.inc -gen-instr-enums)
 tablegen(MBlazeGenInstrInfo.inc -gen-instr-desc)
 tablegen(MBlazeGenCodeEmitter.inc -gen-emitter)
diff --git a/lib/Target/MBlaze/MBlazeRegisterInfo.cpp b/lib/Target/MBlaze/MBlazeRegisterInfo.cpp
index 517279fda5..f52c2e1a29 100644
--- a/lib/Target/MBlaze/MBlazeRegisterInfo.cpp
+++ b/lib/Target/MBlaze/MBlazeRegisterInfo.cpp
@@ -36,12 +36,14 @@
 #include "llvm/Support/raw_ostream.h"
 #include "llvm/ADT/BitVector.h"
 #include "llvm/ADT/STLExtras.h"
-
+#include "MBlazeGenRegisterDesc.inc"
+#include "MBlazeGenRegisterInfo.inc"
 using namespace llvm;
 
 MBlazeRegisterInfo::
 MBlazeRegisterInfo(const MBlazeSubtarget &ST, const TargetInstrInfo &tii)
-  : MBlazeGenRegisterInfo(MBlaze::ADJCALLSTACKDOWN, MBlaze::ADJCALLSTACKUP),
+  : MBlazeGenRegisterInfo(MBlazeRegDesc, MBlazeRegInfoDesc,
+                          MBlaze::ADJCALLSTACKDOWN, MBlaze::ADJCALLSTACKUP),
     Subtarget(ST), TII(tii) {}
 
 /// getRegisterNumbering - Given the enum value for some register, e.g.
@@ -359,6 +361,3 @@ int MBlazeRegisterInfo::getDwarfRegNum(unsigned RegNo, bool isEH) const {
 int MBlazeRegisterInfo::getLLVMRegNum(unsigned DwarfRegNo, bool isEH) const {
   return MBlazeGenRegisterInfo::getLLVMRegNumFull(DwarfRegNo,0);
 }
-
-#include "MBlazeGenRegisterInfo.inc"
-
diff --git a/lib/Target/MBlaze/Makefile b/lib/Target/MBlaze/Makefile
index e01c60bb8c..81fd5f7bba 100644
--- a/lib/Target/MBlaze/Makefile
+++ b/lib/Target/MBlaze/Makefile
@@ -12,12 +12,13 @@ TARGET = MBlaze
 
 # Make sure that tblgen is run, first thing.
 BUILT_SOURCES = MBlazeGenRegisterInfo.h.inc MBlazeGenRegisterNames.inc \
-								MBlazeGenRegisterInfo.inc MBlazeGenInstrNames.inc \
-								MBlazeGenInstrInfo.inc MBlazeGenAsmWriter.inc \
-								MBlazeGenDAGISel.inc MBlazeGenAsmMatcher.inc \
-								MBlazeGenCodeEmitter.inc MBlazeGenCallingConv.inc \
-								MBlazeGenSubtarget.inc MBlazeGenIntrinsics.inc \
-								MBlazeGenEDInfo.inc
+                MBlazeGenRegisterInfo.inc MBlazeGenRegisterDesc.inc \
+                MBlazeGenInstrNames.inc \
+                MBlazeGenInstrInfo.inc MBlazeGenAsmWriter.inc \
+                MBlazeGenDAGISel.inc MBlazeGenAsmMatcher.inc \
+                MBlazeGenCodeEmitter.inc MBlazeGenCallingConv.inc \
+                MBlazeGenSubtarget.inc MBlazeGenIntrinsics.inc \
+                MBlazeGenEDInfo.inc
 
 DIRS = InstPrinter AsmParser Disassembler TargetInfo
 
diff --git a/lib/Target/MSP430/CMakeLists.txt b/lib/Target/MSP430/CMakeLists.txt
index 2c7cbb6441..90752fabdb 100644
--- a/lib/Target/MSP430/CMakeLists.txt
+++ b/lib/Target/MSP430/CMakeLists.txt
@@ -1,8 +1,9 @@
 set(LLVM_TARGET_DEFINITIONS MSP430.td)
 
-tablegen(MSP430GenRegisterInfo.h.inc -gen-register-desc-header)
 tablegen(MSP430GenRegisterNames.inc -gen-register-enums)
-tablegen(MSP430GenRegisterInfo.inc -gen-register-desc)
+tablegen(MSP430GenRegisterDesc.inc -gen-register-desc)
+tablegen(MSP430GenRegisterInfo.h.inc -gen-register-info-header)
+tablegen(MSP430GenRegisterInfo.inc -gen-register-info)
 tablegen(MSP430GenInstrNames.inc -gen-instr-enums)
 tablegen(MSP430GenInstrInfo.inc -gen-instr-desc)
 tablegen(MSP430GenAsmWriter.inc -gen-asm-writer)
diff --git a/lib/Target/MSP430/MSP430RegisterInfo.cpp b/lib/Target/MSP430/MSP430RegisterInfo.cpp
index 53f4c2e4a8..397b7b403f 100644
--- a/lib/Target/MSP430/MSP430RegisterInfo.cpp
+++ b/lib/Target/MSP430/MSP430RegisterInfo.cpp
@@ -25,13 +25,16 @@
 #include "llvm/Target/TargetOptions.h"
 #include "llvm/ADT/BitVector.h"
 #include "llvm/Support/ErrorHandling.h"
+#include "MSP430GenRegisterDesc.inc"
+#include "MSP430GenRegisterInfo.inc"
 
 using namespace llvm;
 
 // FIXME: Provide proper call frame setup / destroy opcodes.
 MSP430RegisterInfo::MSP430RegisterInfo(MSP430TargetMachine &tm,
                                        const TargetInstrInfo &tii)
-  : MSP430GenRegisterInfo(MSP430::ADJCALLSTACKDOWN, MSP430::ADJCALLSTACKUP),
+  : MSP430GenRegisterInfo(MSP430RegDesc, MSP430RegInfoDesc,
+                          MSP430::ADJCALLSTACKDOWN, MSP430::ADJCALLSTACKUP),
     TM(tm), TII(tii) {
   StackAlign = TM.getFrameLowering()->getStackAlignment();
 }
@@ -250,5 +253,3 @@ int MSP430RegisterInfo::getLLVMRegNum(unsigned RegNum, bool isEH) const {
   llvm_unreachable("Not implemented yet!");
   return 0;
 }
-
-#include "MSP430GenRegisterInfo.inc"
diff --git a/lib/Target/MSP430/Makefile b/lib/Target/MSP430/Makefile
index fa4e80b0ff..8635646d5e 100644
--- a/lib/Target/MSP430/Makefile
+++ b/lib/Target/MSP430/Makefile
@@ -13,7 +13,8 @@ TARGET = MSP430
 
 # Make sure that tblgen is run, first thing.
 BUILT_SOURCES = MSP430GenRegisterInfo.h.inc MSP430GenRegisterNames.inc \
-		MSP430GenRegisterInfo.inc MSP430GenInstrNames.inc \
+		MSP430GenRegisterInfo.inc MSP430GenRegisterDesc.inc \
+		MSP430GenInstrNames.inc \
 		MSP430GenInstrInfo.inc MSP430GenAsmWriter.inc \
 		MSP430GenDAGISel.inc MSP430GenCallingConv.inc \
 		MSP430GenSubtarget.inc
diff --git a/lib/Target/Mips/CMakeLists.txt b/lib/Target/Mips/CMakeLists.txt
index fd16516f38..f9d953639f 100644
--- a/lib/Target/Mips/CMakeLists.txt
+++ b/lib/Target/Mips/CMakeLists.txt
@@ -1,8 +1,9 @@
 set(LLVM_TARGET_DEFINITIONS Mips.td)
 
-tablegen(MipsGenRegisterInfo.h.inc -gen-register-desc-header)
 tablegen(MipsGenRegisterNames.inc -gen-register-enums)
-tablegen(MipsGenRegisterInfo.inc -gen-register-desc)
+tablegen(MipsGenRegisterDesc.inc -gen-register-desc)
+tablegen(MipsGenRegisterInfo.h.inc -gen-register-info-header)
+tablegen(MipsGenRegisterInfo.inc -gen-register-info)
 tablegen(MipsGenInstrNames.inc -gen-instr-enums)
 tablegen(MipsGenInstrInfo.inc -gen-instr-desc)
 tablegen(MipsGenAsmWriter.inc -gen-asm-writer)
diff --git a/lib/Target/Mips/Makefile b/lib/Target/Mips/Makefile
index d16b066a62..d7eab61a72 100644
--- a/lib/Target/Mips/Makefile
+++ b/lib/Target/Mips/Makefile
@@ -13,7 +13,8 @@ TARGET = Mips
 
 # Make sure that tblgen is run, first thing.
 BUILT_SOURCES = MipsGenRegisterInfo.h.inc MipsGenRegisterNames.inc \
-                MipsGenRegisterInfo.inc MipsGenInstrNames.inc \
+                MipsGenRegisterInfo.inc MipsGenRegisterDesc.inc \
+		MipsGenInstrNames.inc \
                 MipsGenInstrInfo.inc MipsGenAsmWriter.inc \
                 MipsGenDAGISel.inc MipsGenCallingConv.inc \
                 MipsGenSubtarget.inc
diff --git a/lib/Target/Mips/MipsRegisterInfo.cpp b/lib/Target/Mips/MipsRegisterInfo.cpp
index fa64f637c8..6fdcf45e65 100644
--- a/lib/Target/Mips/MipsRegisterInfo.cpp
+++ b/lib/Target/Mips/MipsRegisterInfo.cpp
@@ -35,12 +35,15 @@
 #include "llvm/Support/raw_ostream.h"
 #include "llvm/ADT/BitVector.h"
 #include "llvm/ADT/STLExtras.h"
+#include "MipsGenRegisterDesc.inc"
+#include "MipsGenRegisterInfo.inc"
 
 using namespace llvm;
 
 MipsRegisterInfo::MipsRegisterInfo(const MipsSubtarget &ST,
                                    const TargetInstrInfo &tii)
-  : MipsGenRegisterInfo(Mips::ADJCALLSTACKDOWN, Mips::ADJCALLSTACKUP),
+  : MipsGenRegisterInfo(MipsRegDesc, MipsRegInfoDesc,
+                        Mips::ADJCALLSTACKDOWN, Mips::ADJCALLSTACKUP),
     Subtarget(ST), TII(tii) {}
 
 /// getRegisterNumbering - Given the enum value for some register, e.g.
@@ -285,5 +288,3 @@ getDwarfRegNum(unsigned RegNum, bool isEH) const {
 int MipsRegisterInfo::getLLVMRegNum(unsigned DwarfRegNo, bool isEH) const {
   return MipsGenRegisterInfo::getLLVMRegNumFull(DwarfRegNo,0);
 }
-
-#include "MipsGenRegisterInfo.inc"
diff --git a/lib/Target/PTX/CMakeLists.txt b/lib/Target/PTX/CMakeLists.txt
index c4448d6f0f..540af72b7c 100644
--- a/lib/Target/PTX/CMakeLists.txt
+++ b/lib/Target/PTX/CMakeLists.txt
@@ -5,8 +5,9 @@ tablegen(PTXGenCallingConv.inc -gen-callingconv)
 tablegen(PTXGenDAGISel.inc -gen-dag-isel)
 tablegen(PTXGenInstrInfo.inc -gen-instr-desc)
 tablegen(PTXGenInstrNames.inc -gen-instr-enums)
-tablegen(PTXGenRegisterInfo.inc -gen-register-desc)
-tablegen(PTXGenRegisterInfo.h.inc -gen-register-desc-header)
+tablegen(PTXGenRegisterDesc.inc -gen-register-desc)
+tablegen(PTXGenRegisterInfo.inc -gen-register-info)
+tablegen(PTXGenRegisterInfo.h.inc -gen-register-info-header)
 tablegen(PTXGenRegisterNames.inc -gen-register-enums)
 tablegen(PTXGenSubtarget.inc -gen-subtarget)
 
diff --git a/lib/Target/PTX/Makefile b/lib/Target/PTX/Makefile
index 844480f3b5..1e471de320 100644
--- a/lib/Target/PTX/Makefile
+++ b/lib/Target/PTX/Makefile
@@ -17,6 +17,7 @@ BUILT_SOURCES = PTXGenAsmWriter.inc \
 		PTXGenDAGISel.inc \
 		PTXGenInstrInfo.inc \
 		PTXGenInstrNames.inc \
+		PTXGenRegisterDesc.inc \
 		PTXGenRegisterInfo.inc \
 		PTXGenRegisterInfo.h.inc \
 		PTXGenRegisterNames.inc \
diff --git a/lib/Target/PTX/PTXRegisterInfo.cpp b/lib/Target/PTX/PTXRegisterInfo.cpp
index b7c7ee5d3a..5673f963f7 100644
--- a/lib/Target/PTX/PTXRegisterInfo.cpp
+++ b/lib/Target/PTX/PTXRegisterInfo.cpp
@@ -19,9 +19,15 @@
 
 using namespace llvm;
 
+#include "PTXGenRegisterDesc.inc"
 #include "PTXGenRegisterInfo.inc"
 
 
+PTXRegisterInfo::PTXRegisterInfo(PTXTargetMachine &TM,
+                                 const TargetInstrInfo &TII)
+  : PTXGenRegisterInfo(PTXRegDesc, PTXRegInfoDesc) {
+}
+
 void PTXRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II,
                                           int SPAdj,
                                           RegScavenger *RS) const {
diff --git a/lib/Target/PTX/PTXRegisterInfo.h b/lib/Target/PTX/PTXRegisterInfo.h
index 223e965f2a..67e8a1b0cf 100644
--- a/lib/Target/PTX/PTXRegisterInfo.h
+++ b/lib/Target/PTX/PTXRegisterInfo.h
@@ -25,7 +25,7 @@ class MachineFunction;
 
 struct PTXRegisterInfo : public PTXGenRegisterInfo {
   PTXRegisterInfo(PTXTargetMachine &TM,
-                  const TargetInstrInfo &TII) {}
+                  const TargetInstrInfo &TII);
 
   virtual const unsigned
     *getCalleeSavedRegs(const MachineFunction *MF = 0) const {
diff --git a/lib/Target/PowerPC/CMakeLists.txt b/lib/Target/PowerPC/CMakeLists.txt
index f28257999d..99caa9944b 100644
--- a/lib/Target/PowerPC/CMakeLists.txt
+++ b/lib/Target/PowerPC/CMakeLists.txt
@@ -5,8 +5,9 @@ tablegen(PPCGenRegisterNames.inc -gen-register-enums)
 tablegen(PPCGenAsmWriter.inc -gen-asm-writer)
 tablegen(PPCGenCodeEmitter.inc -gen-emitter)
 tablegen(PPCGenMCCodeEmitter.inc -gen-emitter -mc-emitter)
-tablegen(PPCGenRegisterInfo.h.inc -gen-register-desc-header)
-tablegen(PPCGenRegisterInfo.inc -gen-register-desc)
+tablegen(PPCGenRegisterDesc.inc -gen-register-desc)
+tablegen(PPCGenRegisterInfo.h.inc -gen-register-info-header)
+tablegen(PPCGenRegisterInfo.inc -gen-register-info)
 tablegen(PPCGenInstrInfo.inc -gen-instr-desc)
 tablegen(PPCGenDAGISel.inc -gen-dag-isel)
 tablegen(PPCGenCallingConv.inc -gen-callingconv)
diff --git a/lib/Target/PowerPC/Makefile b/lib/Target/PowerPC/Makefile
index 030defe212..3d01792bec 100644
--- a/lib/Target/PowerPC/Makefile
+++ b/lib/Target/PowerPC/Makefile
@@ -14,6 +14,7 @@ TARGET = PPC
 # Make sure that tblgen is run, first thing.
 BUILT_SOURCES = PPCGenInstrNames.inc PPCGenRegisterNames.inc \
                 PPCGenAsmWriter.inc  PPCGenCodeEmitter.inc \
+		PPCGenRegisterDesc.inc \
                 PPCGenRegisterInfo.h.inc PPCGenRegisterInfo.inc \
                 PPCGenInstrInfo.inc PPCGenDAGISel.inc \
                 PPCGenSubtarget.inc PPCGenCallingConv.inc \
diff --git a/lib/Target/PowerPC/PPCRegisterInfo.cpp b/lib/Target/PowerPC/PPCRegisterInfo.cpp
index fd62a88136..3950517ca1 100644
--- a/lib/Target/PowerPC/PPCRegisterInfo.cpp
+++ b/lib/Target/PowerPC/PPCRegisterInfo.cpp
@@ -43,6 +43,8 @@
 #include "llvm/ADT/BitVector.h"
 #include "llvm/ADT/STLExtras.h"
 #include <cstdlib>
+#include "PPCGenRegisterDesc.inc"
+#include "PPCGenRegisterInfo.inc"
 
 // FIXME (64-bit): Eventually enable by default.
 namespace llvm {
@@ -110,7 +112,8 @@ unsigned PPCRegisterInfo::getRegisterNumbering(unsigned RegEnum) {
 
 PPCRegisterInfo::PPCRegisterInfo(const PPCSubtarget &ST,
                                  const TargetInstrInfo &tii)
-  : PPCGenRegisterInfo(PPC::ADJCALLSTACKDOWN, PPC::ADJCALLSTACKUP),
+  : PPCGenRegisterInfo(PPCRegDesc, PPCRegInfoDesc,
+                       PPC::ADJCALLSTACKDOWN, PPC::ADJCALLSTACKUP),
     Subtarget(ST), TII(tii) {
   ImmToIdxMap[PPC::LD]   = PPC::LDX;    ImmToIdxMap[PPC::STD]  = PPC::STDX;
   ImmToIdxMap[PPC::LBZ]  = PPC::LBZX;   ImmToIdxMap[PPC::STB]  = PPC::STBX;
@@ -710,5 +713,3 @@ int PPCRegisterInfo::getLLVMRegNum(unsigned RegNum, bool isEH) const {
 
   return PPCGenRegisterInfo::getLLVMRegNumFull(RegNum, Flavour);
 }
-
-#include "PPCGenRegisterInfo.inc"
diff --git a/lib/Target/Sparc/CMakeLists.txt b/lib/Target/Sparc/CMakeLists.txt
index 6839234a47..243e889723 100644
--- a/lib/Target/Sparc/CMakeLists.txt
+++ b/lib/Target/Sparc/CMakeLists.txt
@@ -1,8 +1,9 @@
 set(LLVM_TARGET_DEFINITIONS Sparc.td)
 
-tablegen(SparcGenRegisterInfo.h.inc -gen-register-desc-header)
 tablegen(SparcGenRegisterNames.inc -gen-register-enums)
-tablegen(SparcGenRegisterInfo.inc -gen-register-desc)
+tablegen(SparcGenRegisterDesc.inc -gen-register-desc)
+tablegen(SparcGenRegisterInfo.h.inc -gen-register-info-header)
+tablegen(SparcGenRegisterInfo.inc -gen-register-info)
 tablegen(SparcGenInstrNames.inc -gen-instr-enums)
 tablegen(SparcGenInstrInfo.inc -gen-instr-desc)
 tablegen(SparcGenAsmWriter.inc -gen-asm-writer)
diff --git a/lib/Target/Sparc/Makefile b/lib/Target/Sparc/Makefile
index 27942c56fb..af7d9daa3d 100644
--- a/lib/Target/Sparc/Makefile
+++ b/lib/Target/Sparc/Makefile
@@ -13,7 +13,8 @@ TARGET = Sparc
 
 # Make sure that tblgen is run, first thing.
 BUILT_SOURCES = SparcGenRegisterInfo.h.inc SparcGenRegisterNames.inc \
-                SparcGenRegisterInfo.inc SparcGenInstrNames.inc \
+                SparcGenRegisterInfo.inc SparcGenRegisterDesc.inc \
+		SparcGenInstrNames.inc \
                 SparcGenInstrInfo.inc SparcGenAsmWriter.inc \
                 SparcGenDAGISel.inc SparcGenSubtarget.inc SparcGenCallingConv.inc
 
diff --git a/lib/Target/Sparc/SparcRegisterInfo.cpp b/lib/Target/Sparc/SparcRegisterInfo.cpp
index 9fcf028fa6..c63f52e958 100644
--- a/lib/Target/Sparc/SparcRegisterInfo.cpp
+++ b/lib/Target/Sparc/SparcRegisterInfo.cpp
@@ -23,11 +23,14 @@
 #include "llvm/Type.h"
 #include "llvm/ADT/BitVector.h"
 #include "llvm/ADT/STLExtras.h"
+#include "SparcGenRegisterDesc.inc"
+#include "SparcGenRegisterInfo.inc"
 using namespace llvm;
 
 SparcRegisterInfo::SparcRegisterInfo(SparcSubtarget &st,
                                      const TargetInstrInfo &tii)
-  : SparcGenRegisterInfo(SP::ADJCALLSTACKDOWN, SP::ADJCALLSTACKUP),
+  : SparcGenRegisterInfo(SparcRegDesc, SparcRegInfoDesc,
+                         SP::ADJCALLSTACKDOWN, SP::ADJCALLSTACKUP),
     Subtarget(st), TII(tii) {
 }
 
@@ -135,6 +138,3 @@ int SparcRegisterInfo::getDwarfRegNum(unsigned RegNum, bool isEH) const {
 int SparcRegisterInfo::getLLVMRegNum(unsigned DwarfRegNo, bool isEH) const {
   return SparcGenRegisterInfo::getLLVMRegNumFull(DwarfRegNo,0);
 }
-
-#include "SparcGenRegisterInfo.inc"
-
diff --git a/lib/Target/SystemZ/CMakeLists.txt b/lib/Target/SystemZ/CMakeLists.txt
index 1f5d3552ae..3e06109a39 100644
--- a/lib/Target/SystemZ/CMakeLists.txt
+++ b/lib/Target/SystemZ/CMakeLists.txt
@@ -1,8 +1,9 @@
 set(LLVM_TARGET_DEFINITIONS SystemZ.td)
 
-tablegen(SystemZGenRegisterInfo.h.inc -gen-register-desc-header)
 tablegen(SystemZGenRegisterNames.inc -gen-register-enums)
-tablegen(SystemZGenRegisterInfo.inc -gen-register-desc)
+tablegen(SystemZGenRegisterDesc.inc -gen-register-desc)
+tablegen(SystemZGenRegisterInfo.h.inc -gen-register-info-header)
+tablegen(SystemZGenRegisterInfo.inc -gen-register-info)
 tablegen(SystemZGenInstrNames.inc -gen-instr-enums)
 tablegen(SystemZGenInstrInfo.inc -gen-instr-desc)
 tablegen(SystemZGenAsmWriter.inc -gen-asm-writer)
diff --git a/lib/Target/SystemZ/Makefile b/lib/Target/SystemZ/Makefile
index 6930e14c06..24817152fb 100644
--- a/lib/Target/SystemZ/Makefile
+++ b/lib/Target/SystemZ/Makefile
@@ -13,7 +13,8 @@ TARGET = SystemZ
 
 # Make sure that tblgen is run, first thing.
 BUILT_SOURCES = SystemZGenRegisterInfo.h.inc SystemZGenRegisterNames.inc \
-                SystemZGenRegisterInfo.inc SystemZGenInstrNames.inc \
+                SystemZGenRegisterInfo.inc SystemZGenRegisterDesc.inc \
+		SystemZGenInstrNames.inc \
                 SystemZGenInstrInfo.inc SystemZGenAsmWriter.inc \
                 SystemZGenDAGISel.inc SystemZGenSubtarget.inc SystemZGenCallingConv.inc
 
diff --git a/lib/Target/SystemZ/SystemZRegisterInfo.cpp b/lib/Target/SystemZ/SystemZRegisterInfo.cpp
index d5c165f640..a587e1c289 100644
--- a/lib/Target/SystemZ/SystemZRegisterInfo.cpp
+++ b/lib/Target/SystemZ/SystemZRegisterInfo.cpp
@@ -25,11 +25,14 @@
 #include "llvm/Target/TargetMachine.h"
 #include "llvm/Target/TargetOptions.h"
 #include "llvm/ADT/BitVector.h"
+#include "SystemZGenRegisterDesc.inc"
+#include "SystemZGenRegisterInfo.inc"
 using namespace llvm;
 
 SystemZRegisterInfo::SystemZRegisterInfo(SystemZTargetMachine &tm,
                                          const SystemZInstrInfo &tii)
-  : SystemZGenRegisterInfo(SystemZ::ADJCALLSTACKUP, SystemZ::ADJCALLSTACKDOWN),
+  : SystemZGenRegisterInfo(SystemZRegDesc, SystemZRegInfoDesc,
+                           SystemZ::ADJCALLSTACKUP, SystemZ::ADJCALLSTACKDOWN),
     TM(tm), TII(tii) {
 }
 
@@ -153,6 +156,3 @@ int SystemZRegisterInfo::getLLVMRegNum(unsigned DwarfRegNo, bool isEH) const {
   assert(0 && "What is the dwarf register number");
   return -1;
 }
-
-
-#include "SystemZGenRegisterInfo.inc"
diff --git a/lib/Target/TargetRegisterInfo.cpp b/lib/Target/TargetRegisterInfo.cpp
index bae3343a85..d01130a5ae 100644
--- a/lib/Target/TargetRegisterInfo.cpp
+++ b/lib/Target/TargetRegisterInfo.cpp
@@ -20,15 +20,12 @@
 
 using namespace llvm;
 
-TargetRegisterInfo::TargetRegisterInfo(const TargetRegisterDesc *D, unsigned NR,
+TargetRegisterInfo::TargetRegisterInfo(const TargetRegisterInfoDesc *ID,
                              regclass_iterator RCB, regclass_iterator RCE,
                              const char *const *subregindexnames,
                              int CFSO, int CFDO)
-  : Desc(D), SubRegIndexNames(subregindexnames), NumRegs(NR),
+  : InfoDesc(ID), SubRegIndexNames(subregindexnames),
     RegClassBegin(RCB), RegClassEnd(RCE) {
-  assert(isPhysicalRegister(NumRegs) &&
-         "Target has too many physical registers!");
-
   CallFrameSetupOpcode   = CFSO;
   CallFrameDestroyOpcode = CFDO;
 }
@@ -86,7 +83,7 @@ static void getAllocatableSetForRC(const MachineFunction &MF,
 
 BitVector TargetRegisterInfo::getAllocatableSet(const MachineFunction &MF,
                                           const TargetRegisterClass *RC) const {
-  BitVector Allocatable(NumRegs);
+  BitVector Allocatable(getNumRegs());
   if (RC) {
     getAllocatableSetForRC(MF, RC, Allocatable);
   } else {
diff --git a/lib/Target/X86/CMakeLists.txt b/lib/Target/X86/CMakeLists.txt
index b5fa94f12b..5e0c84fcab 100644
--- a/lib/Target/X86/CMakeLists.txt
+++ b/lib/Target/X86/CMakeLists.txt
@@ -1,8 +1,9 @@
 set(LLVM_TARGET_DEFINITIONS X86.td)
 
-tablegen(X86GenRegisterInfo.h.inc -gen-register-desc-header)
 tablegen(X86GenRegisterNames.inc -gen-register-enums)
-tablegen(X86GenRegisterInfo.inc -gen-register-desc)
+tablegen(X86GenRegisterDesc.inc -gen-register-desc)
+tablegen(X86GenRegisterInfo.h.inc -gen-register-info-header)
+tablegen(X86GenRegisterInfo.inc -gen-register-info)
 tablegen(X86GenDisassemblerTables.inc -gen-disassembler)
 tablegen(X86GenInstrNames.inc -gen-instr-enums)
 tablegen(X86GenInstrInfo.inc -gen-instr-desc)
diff --git a/lib/Target/X86/Makefile b/lib/Target/X86/Makefile
index 12fb090d4d..9cd17eed6c 100644
--- a/lib/Target/X86/Makefile
+++ b/lib/Target/X86/Makefile
@@ -12,14 +12,15 @@ LIBRARYNAME = LLVMX86CodeGen
 TARGET = X86
 
 # Make sure that tblgen is run, first thing.
-BUILT_SOURCES = X86GenRegisterInfo.h.inc X86GenRegisterNames.inc \
-                X86GenRegisterInfo.inc X86GenInstrNames.inc \
-                X86GenInstrInfo.inc X86GenAsmWriter.inc X86GenAsmMatcher.inc \
+BUILT_SOURCES = X86GenRegisterNames.inc X86GenRegisterDesc.inc \
+		X86GenRegisterInfo.h.inc X86GenRegisterInfo.inc \
+		X86GenInstrNames.inc X86GenInstrInfo.inc \
+		X86GenAsmWriter.inc X86GenAsmMatcher.inc \
                 X86GenAsmWriter1.inc X86GenDAGISel.inc  \
                 X86GenDisassemblerTables.inc X86GenFastISel.inc \
                 X86GenCallingConv.inc X86GenSubtarget.inc \
 		X86GenEDInfo.inc
 
-DIRS = InstPrinter AsmParser Disassembler TargetInfo Utils
+DIRS = InstPrinter AsmParser Disassembler TargetInfo TargetDesc Utils
 
 include $(LEVEL)/Makefile.common
diff --git a/lib/Target/X86/TargetDesc/Makefile b/lib/Target/X86/TargetDesc/Makefile
new file mode 100644
index 0000000000..b19774ee37
--- /dev/null
+++ b/lib/Target/X86/TargetDesc/Makefile
@@ -0,0 +1,16 @@
+##===- lib/Target/X86/TargetDesc/Makefile ------------------*- Makefile -*-===##
+#
+#                     The LLVM Compiler Infrastructure
+#
+# This file is distributed under the University of Illinois Open Source
+# License. See LICENSE.TXT for details.
+#
+##===----------------------------------------------------------------------===##
+
+LEVEL = ../../../..
+LIBRARYNAME = LLVMX86Desc
+
+# Hack: we need to include 'main' target directory to grab private headers
+CPP.Flags += -I$(PROJ_OBJ_DIR)/.. -I$(PROJ_SRC_DIR)/..
+
+include $(LEVEL)/Makefile.common
diff --git a/lib/Target/X86/TargetDesc/X86TargetDesc.cpp b/lib/Target/X86/TargetDesc/X86TargetDesc.cpp
new file mode 100644
index 0000000000..cf03d48f3c
--- /dev/null
+++ b/lib/Target/X86/TargetDesc/X86TargetDesc.cpp
@@ -0,0 +1,23 @@
+//===-- X86TargetDesc.cpp - X86 Target Descriptions -------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file provides X86 specific target descriptions.
+//
+//===----------------------------------------------------------------------===//
+
+#include "X86TargetDesc.h"
+#include "llvm/MC/MCRegisterInfo.h"
+#include "X86GenRegisterDesc.inc"
+using namespace llvm;
+
+MCRegisterInfo *createX86MCRegisterInfo() {
+  MCRegisterInfo *X = new MCRegisterInfo();
+  InitX86MCRegisterInfo(X);
+  return X;
+}
diff --git a/lib/Target/X86/TargetDesc/X86TargetDesc.h b/lib/Target/X86/TargetDesc/X86TargetDesc.h
new file mode 100644
index 0000000000..d08aec773b
--- /dev/null
+++ b/lib/Target/X86/TargetDesc/X86TargetDesc.h
@@ -0,0 +1,17 @@
+//===-- X86TargetDesc.h - X86 Target Descriptions ---------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file provides X86 specific target descriptions.
+//
+//===----------------------------------------------------------------------===//
+
+// Defines symbolic names for X86 registers.  This defines a mapping from
+// register name to register number.
+//
+#include "X86GenRegisterNames.inc"
diff --git a/lib/Target/X86/X86.h b/lib/Target/X86/X86.h
index 0ca4366900..ec78d489a6 100644
--- a/lib/Target/X86/X86.h
+++ b/lib/Target/X86/X86.h
@@ -88,10 +88,7 @@ extern Target TheX86_32Target, TheX86_64Target;
 
 } // End llvm namespace
 
-// Defines symbolic names for X86 registers.  This defines a mapping from
-// register name to register number.
-//
-#include "X86GenRegisterNames.inc"
+#include "TargetDesc/X86TargetDesc.h"
 
 // Defines symbolic names for the X86 instructions.
 //
diff --git a/lib/Target/X86/X86RegisterInfo.cpp b/lib/Target/X86/X86RegisterInfo.cpp
index fa3e3f8429..c67da21107 100644
--- a/lib/Target/X86/X86RegisterInfo.cpp
+++ b/lib/Target/X86/X86RegisterInfo.cpp
@@ -39,6 +39,8 @@
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/CommandLine.h"
+#include "X86GenRegisterDesc.inc"
+#include "X86GenRegisterInfo.inc"
 using namespace llvm;
 
 cl::opt<bool>
@@ -49,7 +51,8 @@ ForceStackAlign("force-align-stack",
 
 X86RegisterInfo::X86RegisterInfo(X86TargetMachine &tm,
                                  const TargetInstrInfo &tii)
-  : X86GenRegisterInfo(tm.getSubtarget<X86Subtarget>().is64Bit() ?
+  : X86GenRegisterInfo(X86RegDesc, X86RegInfoDesc,
+                       tm.getSubtarget<X86Subtarget>().is64Bit() ?
                          X86::ADJCALLSTACKDOWN64 :
                          X86::ADJCALLSTACKDOWN32,
                        tm.getSubtarget<X86Subtarget>().is64Bit() ?
@@ -918,8 +921,6 @@ unsigned getX86SubSuperRegister(unsigned Reg, EVT VT, bool High) {
 }
 }
 
-#include "X86GenRegisterInfo.inc"
-
 namespace {
   struct MSAH : public MachineFunctionPass {
     static char ID;
diff --git a/lib/Target/XCore/CMakeLists.txt b/lib/Target/XCore/CMakeLists.txt
index 9093de6915..1ed1538b20 100644
--- a/lib/Target/XCore/CMakeLists.txt
+++ b/lib/Target/XCore/CMakeLists.txt
@@ -1,8 +1,8 @@
 set(LLVM_TARGET_DEFINITIONS XCore.td)
 
-tablegen(XCoreGenRegisterInfo.h.inc -gen-register-desc-header)
-tablegen(XCoreGenRegisterNames.inc -gen-register-enums)
-tablegen(XCoreGenRegisterInfo.inc -gen-register-desc)
+tablegen(XCoreGenRegisterDesc.inc -gen-register-desc)
+tablegen(XCoreGenRegisterInfo.h.inc -gen-register-info-header)
+tablegen(XCoreGenRegisterInfo.inc -gen-register-info)
 tablegen(XCoreGenInstrNames.inc -gen-instr-enums)
 tablegen(XCoreGenInstrInfo.inc -gen-instr-desc)
 tablegen(XCoreGenAsmWriter.inc -gen-asm-writer)
diff --git a/lib/Target/XCore/Makefile b/lib/Target/XCore/Makefile
index 6c1ef88603..f67ef517a1 100644
--- a/lib/Target/XCore/Makefile
+++ b/lib/Target/XCore/Makefile
@@ -13,7 +13,8 @@ TARGET = XCore
 
 # Make sure that tblgen is run, first thing.
 BUILT_SOURCES = XCoreGenRegisterInfo.h.inc XCoreGenRegisterNames.inc \
-                XCoreGenRegisterInfo.inc XCoreGenInstrNames.inc \
+                XCoreGenRegisterInfo.inc XCoreGenRegisterDesc.inc \
+		XCoreGenInstrNames.inc \
                 XCoreGenInstrInfo.inc XCoreGenAsmWriter.inc \
                 XCoreGenDAGISel.inc XCoreGenCallingConv.inc \
 		XCoreGenSubtarget.inc
diff --git a/lib/Target/XCore/XCoreRegisterInfo.cpp b/lib/Target/XCore/XCoreRegisterInfo.cpp
index 46c9e57c1a..966e33b6db 100644
--- a/lib/Target/XCore/XCoreRegisterInfo.cpp
+++ b/lib/Target/XCore/XCoreRegisterInfo.cpp
@@ -32,11 +32,13 @@
 #include "llvm/Support/Debug.h"
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/raw_ostream.h"
-
+#include "XCoreGenRegisterDesc.inc"
+#include "XCoreGenRegisterInfo.inc"
 using namespace llvm;
 
 XCoreRegisterInfo::XCoreRegisterInfo(const TargetInstrInfo &tii)
-  : XCoreGenRegisterInfo(XCore::ADJCALLSTACKDOWN, XCore::ADJCALLSTACKUP),
+  : XCoreGenRegisterInfo(XCoreRegDesc, XCoreRegInfoDesc,
+                         XCore::ADJCALLSTACKDOWN, XCore::ADJCALLSTACKUP),
     TII(tii) {
 }
 
@@ -328,6 +330,3 @@ unsigned XCoreRegisterInfo::getFrameRegister(const MachineFunction &MF) const {
 unsigned XCoreRegisterInfo::getRARegister() const {
   return XCore::LR;
 }
-
-#include "XCoreGenRegisterInfo.inc"
-
diff --git a/utils/TableGen/RegisterInfoEmitter.cpp b/utils/TableGen/RegisterInfoEmitter.cpp
index 991f34c1b9..997f1c0b73 100644
--- a/utils/TableGen/RegisterInfoEmitter.cpp
+++ b/utils/TableGen/RegisterInfoEmitter.cpp
@@ -79,7 +79,8 @@ void RegisterInfoEmitter::runHeader(raw_ostream &OS) {
 
   OS << "struct " << ClassName << " : public TargetRegisterInfo {\n"
      << "  explicit " << ClassName
-     << "(int CallFrameSetupOpcode = -1, int CallFrameDestroyOpcode = -1);\n"
+     << "(const TargetRegisterDesc *D, const TargetRegisterInfoDesc *ID, "
+     << "int CallFrameSetupOpcode = -1, int CallFrameDestroyOpcode = -1);\n"
      << "  virtual int getDwarfRegNumFull(unsigned RegNum, "
      << "unsigned Flavour) const;\n"
      << "  virtual int getLLVMRegNumFull(unsigned DwarfRegNum, "
@@ -140,8 +141,6 @@ void RegisterInfoEmitter::run(raw_ostream &OS) {
   CodeGenTarget Target(Records);
   CodeGenRegBank &RegBank = Target.getRegBank();
   RegBank.computeDerivedInfo();
-  std::map<const CodeGenRegister*, CodeGenRegister::Set> Overlaps;
-  RegBank.computeOverlaps(Overlaps);
 
   EmitSourceFileHeader("Register Information Source Fragment", OS);
 
@@ -407,78 +406,22 @@ void RegisterInfoEmitter::run(raw_ostream &OS) {
        << "RegClass,\n";
   OS << "  };\n";
 
-  typedef std::map<Record*, std::vector<int64_t>, LessRecord> DwarfRegNumsMapTy;
-  DwarfRegNumsMapTy DwarfRegNums;
-  const std::vector<CodeGenRegister*> &Regs = RegBank.getRegisters();
-
-  // Emit an overlap list for all registers.
-  for (unsigned i = 0, e = Regs.size(); i != e; ++i) {
-    const CodeGenRegister *Reg = Regs[i];
-    const CodeGenRegister::Set &O = Overlaps[Reg];
-    // Move Reg to the front so TRI::getAliasSet can share the list.
-    OS << "  const unsigned " << Reg->getName() << "_Overlaps[] = { "
-       << getQualifiedName(Reg->TheDef) << ", ";
-    for (CodeGenRegister::Set::const_iterator I = O.begin(), E = O.end();
-         I != E; ++I)
-      if (*I != Reg)
-        OS << getQualifiedName((*I)->TheDef) << ", ";
-    OS << "0 };\n";
-  }
-
-  // Emit the empty sub-registers list
-  OS << "  const unsigned Empty_SubRegsSet[] = { 0 };\n";
-  // Loop over all of the registers which have sub-registers, emitting the
-  // sub-registers list to memory.
-  for (unsigned i = 0, e = Regs.size(); i != e; ++i) {
-    const CodeGenRegister &Reg = *Regs[i];
-    if (Reg.getSubRegs().empty())
-     continue;
-    // getSubRegs() orders by SubRegIndex. We want a topological order.
-    SetVector<CodeGenRegister*> SR;
-    Reg.addSubRegsPreOrder(SR);
-    OS << "  const unsigned " << Reg.getName() << "_SubRegsSet[] = { ";
-    for (unsigned j = 0, je = SR.size(); j != je; ++j)
-      OS << getQualifiedName(SR[j]->TheDef) << ", ";
-    OS << "0 };\n";
-  }
+  // Emit extra information about registers.
+  OS << "\n  static const TargetRegisterInfoDesc "
+     << Target.getName() << "RegInfoDesc[] = "
+     << "{ // Extra Descriptors\n";
+  OS << "    { 0, 0 },\n";
 
-  // Emit the empty super-registers list
-  OS << "  const unsigned Empty_SuperRegsSet[] = { 0 };\n";
-  // Loop over all of the registers which have super-registers, emitting the
-  // super-registers list to memory.
-  for (unsigned i = 0, e = Regs.size(); i != e; ++i) {
-    const CodeGenRegister &Reg = *Regs[i];
-    const CodeGenRegister::SuperRegList &SR = Reg.getSuperRegs();
-    if (SR.empty())
-      continue;
-    OS << "  const unsigned " << Reg.getName() << "_SuperRegsSet[] = { ";
-    for (unsigned j = 0, je = SR.size(); j != je; ++j)
-      OS << getQualifiedName(SR[j]->TheDef) << ", ";
-    OS << "0 };\n";
-  }
-
-  OS<<"\n  const TargetRegisterDesc RegisterDescriptors[] = { // Descriptors\n";
-  OS << "    { \"NOREG\",\t0,\t0,\t0,\t0,\t0 },\n";
-
-  // Now that register alias and sub-registers sets have been emitted, emit the
-  // register descriptors now.
+  const std::vector<CodeGenRegister*> &Regs = RegBank.getRegisters();
   for (unsigned i = 0, e = Regs.size(); i != e; ++i) {
     const CodeGenRegister &Reg = *Regs[i];
-    OS << "    { \"";
-    OS << Reg.getName() << "\",\t" << Reg.getName() << "_Overlaps,\t";
-    if (!Reg.getSubRegs().empty())
-      OS << Reg.getName() << "_SubRegsSet,\t";
-    else
-      OS << "Empty_SubRegsSet,\t";
-    if (!Reg.getSuperRegs().empty())
-      OS << Reg.getName() << "_SuperRegsSet,\t";
-    else
-      OS << "Empty_SuperRegsSet,\t";
-    OS << Reg.CostPerUse << ",\t"
+    OS << "    { ";
+    OS << Reg.CostPerUse << ", "
        << int(AllocatableRegs.count(Reg.TheDef)) << " },\n";
   }
   OS << "  };\n";      // End of register descriptors...
 
+
   // Calculate the mapping of subregister+index pairs to physical registers.
   // This will also create further anonymous indexes.
   unsigned NamedIndices = RegBank.getNumNamedIndices();
@@ -575,14 +518,18 @@ void RegisterInfoEmitter::run(raw_ostream &OS) {
 
   // Emit the constructor of the class...
   OS << ClassName << "::" << ClassName
-     << "(int CallFrameSetupOpcode, int CallFrameDestroyOpcode)\n"
-     << "  : TargetRegisterInfo(RegisterDescriptors, " << Regs.size()+1
+     << "(const TargetRegisterDesc *D, const TargetRegisterInfoDesc *ID, "
+     << "int CallFrameSetupOpcode, int CallFrameDestroyOpcode)\n"
+     << "  : TargetRegisterInfo(ID"
      << ", RegisterClasses, RegisterClasses+" << RegisterClasses.size() <<",\n"
      << "                 SubRegIndexTable,\n"
      << "                 CallFrameSetupOpcode, CallFrameDestroyOpcode) {\n"
+     << "  InitMCRegisterInfo(D, " << Regs.size()+1 << ");\n"
      << "}\n\n";
 
   // Collect all information about dwarf register numbers
+  typedef std::map<Record*, std::vector<int64_t>, LessRecord> DwarfRegNumsMapTy;
+  DwarfRegNumsMapTy DwarfRegNums;
 
   // First, just pull all provided information to the map
   unsigned maxLength = 0;
@@ -671,3 +618,101 @@ void RegisterInfoEmitter::run(raw_ostream &OS) {
 
   OS << "} // End llvm namespace \n";
 }
+
+void RegisterInfoEmitter::runDesc(raw_ostream &OS) {
+  CodeGenTarget Target(Records);
+  CodeGenRegBank &RegBank = Target.getRegBank();
+  RegBank.computeDerivedInfo();
+  std::map<const CodeGenRegister*, CodeGenRegister::Set> Overlaps;
+  RegBank.computeOverlaps(Overlaps);
+
+  OS << "namespace llvm {\n\n";
+
+  const std::string &TargetName = Target.getName();
+  std::string ClassName = TargetName + "GenMCRegisterInfo";
+  OS << "struct " << ClassName << " : public MCRegisterInfo {\n"
+     << "  explicit " << ClassName << "(const TargetRegisterDesc *D);\n";
+  OS << "};\n";
+
+  OS << "\nnamespace {\n";
+
+  const std::vector<CodeGenRegister*> &Regs = RegBank.getRegisters();
+
+  // Emit an overlap list for all registers.
+  for (unsigned i = 0, e = Regs.size(); i != e; ++i) {
+    const CodeGenRegister *Reg = Regs[i];
+    const CodeGenRegister::Set &O = Overlaps[Reg];
+    // Move Reg to the front so TRI::getAliasSet can share the list.
+    OS << "  const unsigned " << Reg->getName() << "_Overlaps[] = { "
+       << getQualifiedName(Reg->TheDef) << ", ";
+    for (CodeGenRegister::Set::const_iterator I = O.begin(), E = O.end();
+         I != E; ++I)
+      if (*I != Reg)
+        OS << getQualifiedName((*I)->TheDef) << ", ";
+    OS << "0 };\n";
+  }
+
+  // Emit the empty sub-registers list
+  OS << "  const unsigned Empty_SubRegsSet[] = { 0 };\n";
+  // Loop over all of the registers which have sub-registers, emitting the
+  // sub-registers list to memory.
+  for (unsigned i = 0, e = Regs.size(); i != e; ++i) {
+    const CodeGenRegister &Reg = *Regs[i];
+    if (Reg.getSubRegs().empty())
+     continue;
+    // getSubRegs() orders by SubRegIndex. We want a topological order.
+    SetVector<CodeGenRegister*> SR;
+    Reg.addSubRegsPreOrder(SR);
+    OS << "  const unsigned " << Reg.getName() << "_SubRegsSet[] = { ";
+    for (unsigned j = 0, je = SR.size(); j != je; ++j)
+      OS << getQualifiedName(SR[j]->TheDef) << ", ";
+    OS << "0 };\n";
+  }
+
+  // Emit the empty super-registers list
+  OS << "  const unsigned Empty_SuperRegsSet[] = { 0 };\n";
+  // Loop over all of the registers which have super-registers, emitting the
+  // super-registers list to memory.
+  for (unsigned i = 0, e = Regs.size(); i != e; ++i) {
+    const CodeGenRegister &Reg = *Regs[i];
+    const CodeGenRegister::SuperRegList &SR = Reg.getSuperRegs();
+    if (SR.empty())
+      continue;
+    OS << "  const unsigned " << Reg.getName() << "_SuperRegsSet[] = { ";
+    for (unsigned j = 0, je = SR.size(); j != je; ++j)
+      OS << getQualifiedName(SR[j]->TheDef) << ", ";
+    OS << "0 };\n";
+  }
+
+  OS << "\n  const TargetRegisterDesc " << TargetName
+     << "RegDesc[] = { // Descriptors\n";
+  OS << "    { \"NOREG\",\t0,\t0,\t0 },\n";
+
+  // Now that register alias and sub-registers sets have been emitted, emit the
+  // register descriptors now.
+  for (unsigned i = 0, e = Regs.size(); i != e; ++i) {
+    const CodeGenRegister &Reg = *Regs[i];
+    OS << "    { \"";
+    OS << Reg.getName() << "\",\t" << Reg.getName() << "_Overlaps,\t";
+    if (!Reg.getSubRegs().empty())
+      OS << Reg.getName() << "_SubRegsSet,\t";
+    else
+      OS << "Empty_SubRegsSet,\t";
+    if (!Reg.getSuperRegs().empty())
+      OS << Reg.getName() << "_SuperRegsSet";
+    else
+      OS << "Empty_SuperRegsSet";
+    OS << " },\n";
+  }
+  OS << "  };\n";      // End of register descriptors...
+
+  OS << "}\n\n";       // End of anonymous namespace...
+
+  // MCRegisterInfo initialization routine.
+  OS << "void " << "Init" << TargetName
+     << "MCRegisterInfo(MCRegisterInfo *RI) {\n";
+  OS << "  RI->InitMCRegisterInfo(" << TargetName << "RegDesc, "
+     << Regs.size()+1 << ");\n}\n\n";
+
+  OS << "} // End llvm namespace \n";
+}
diff --git a/utils/TableGen/RegisterInfoEmitter.h b/utils/TableGen/RegisterInfoEmitter.h
index 1456b4f1ec..6bf14b259a 100644
--- a/utils/TableGen/RegisterInfoEmitter.h
+++ b/utils/TableGen/RegisterInfoEmitter.h
@@ -33,6 +33,9 @@ public:
 
   // runEnums - Print out enum values for all of the registers.
   void runEnums(raw_ostream &o);
+
+  // runDesc - Print out register descriptions.
+  void runDesc(raw_ostream &o);
 };
 
 } // End llvm namespace
diff --git a/utils/TableGen/TableGen.cpp b/utils/TableGen/TableGen.cpp
index 39fe9934cd..b11ef6f698 100644
--- a/utils/TableGen/TableGen.cpp
+++ b/utils/TableGen/TableGen.cpp
@@ -54,7 +54,7 @@ using namespace llvm;
 enum ActionType {
   PrintRecords,
   GenEmitter,
-  GenRegisterEnums, GenRegister, GenRegisterHeader,
+  GenRegisterEnums, GenRegisterDesc, GenRegisterInfo, GenRegisterInfoHeader,
   GenInstrEnums, GenInstrs, GenAsmWriter, GenAsmMatcher,
   GenARMDecoder,
   GenDisassembler,
@@ -95,10 +95,12 @@ namespace {
                                "Generate machine code emitter"),
                     clEnumValN(GenRegisterEnums, "gen-register-enums",
                                "Generate enum values for registers"),
-                    clEnumValN(GenRegister, "gen-register-desc",
-                               "Generate a register info description"),
-                    clEnumValN(GenRegisterHeader, "gen-register-desc-header",
-                               "Generate a register info description header"),
+                    clEnumValN(GenRegisterDesc, "gen-register-desc",
+                               "Generate register descriptions"),
+                    clEnumValN(GenRegisterInfo, "gen-register-info",
+                               "Generate registers & reg-classes info"),
+                    clEnumValN(GenRegisterInfoHeader, "gen-register-info-header",
+                               "Generate registers & reg-classes info header"),
                     clEnumValN(GenInstrEnums, "gen-instr-enums",
                                "Generate enum values for instructions"),
                     clEnumValN(GenInstrs, "gen-instr-desc",
@@ -261,14 +263,16 @@ int main(int argc, char **argv) {
     case GenEmitter:
       CodeEmitterGen(Records).run(Out.os());
       break;
-
     case GenRegisterEnums:
       RegisterInfoEmitter(Records).runEnums(Out.os());
       break;
-    case GenRegister:
+    case GenRegisterDesc:
+      RegisterInfoEmitter(Records).runDesc(Out.os());
+      break;
+    case GenRegisterInfo:
       RegisterInfoEmitter(Records).run(Out.os());
       break;
-    case GenRegisterHeader:
+    case GenRegisterInfoHeader:
       RegisterInfoEmitter(Records).runHeader(Out.os());
       break;
     case GenInstrEnums: