Add the exit instruction to the PTX target.

Patch by Che-Liang Chiou <clchiou@gmail.com>!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@114294 91177308-0d34-0410-b5e6-96231b3b80d8

22 files changed, 705 insertions, 16 deletions

diff --git a/lib/Target/PTX/AsmPrinter/PTXAsmPrinter.cpp b/lib/Target/PTX/AsmPrinter/PTXAsmPrinter.cpp
index 1a723a22e9..1e76f28f65 100644
--- a/lib/Target/PTX/AsmPrinter/PTXAsmPrinter.cpp
+++ b/lib/Target/PTX/AsmPrinter/PTXAsmPrinter.cpp
@@ -14,7 +14,11 @@
 
 #include "PTX.h"
 #include "PTXTargetMachine.h"
+#include "llvm/Support/raw_ostream.h"
+#include "llvm/ADT/SmallString.h"
 #include "llvm/CodeGen/AsmPrinter.h"
+#include "llvm/CodeGen/MachineInstr.h"
+#include "llvm/MC/MCStreamer.h"
 #include "llvm/Target/TargetRegistry.h"
 
 using namespace llvm;
@@ -25,11 +29,26 @@ namespace {
       explicit PTXAsmPrinter(TargetMachine &TM, MCStreamer &Streamer) :
         AsmPrinter(TM, Streamer) {}
       const char *getPassName() const { return "PTX Assembly Printer"; }
+
+      virtual void EmitInstruction(const MachineInstr *MI);
+
+      // autogen'd.
+      void printInstruction(const MachineInstr *MI, raw_ostream &OS);
+      static const char *getRegisterName(unsigned RegNo);
   };
 } // namespace
 
+void PTXAsmPrinter::EmitInstruction(const MachineInstr *MI) {
+  SmallString<128> str;
+  raw_svector_ostream os(str);
+  printInstruction(MI, os);
+  os << ';';
+  OutStreamer.EmitRawText(os.str());
+}
+
+#include "PTXGenAsmWriter.inc"
+
 // Force static initialization.
-extern "C" void LLVMInitializePTXAsmPrinter()
-{
+extern "C" void LLVMInitializePTXAsmPrinter() {
   RegisterAsmPrinter<PTXAsmPrinter> X(ThePTXTarget);
 }
diff --git a/lib/Target/PTX/CMakeLists.txt b/lib/Target/PTX/CMakeLists.txt
index 6505e067f6..5104f2b8bf 100644
--- a/lib/Target/PTX/CMakeLists.txt
+++ b/lib/Target/PTX/CMakeLists.txt
@@ -1,6 +1,22 @@
 set(LLVM_TARGET_DEFINITIONS PTX.td)
 
+tablegen(PTXGenAsmWriter.inc -gen-asm-writer)
+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(PTXGenRegisterNames.inc -gen-register-enums)
+tablegen(PTXGenSubtarget.inc -gen-subtarget)
+
 add_llvm_target(PTXCodeGen
+  PTXISelDAGToDAG.cpp
+  PTXISelLowering.cpp
+  PTXInstrInfo.cpp
+  PTXMCAsmInfo.cpp
+  PTXRegisterInfo.cpp
+  PTXSubtarget.cpp
+  PTXTargetMachine.cpp
   )
 
 target_link_libraries (LLVMPTXCodeGen LLVMSelectionDAG)
diff --git a/lib/Target/PTX/Makefile b/lib/Target/PTX/Makefile
index fcbf9317a9..cfb3b9c0f7 100644
--- a/lib/Target/PTX/Makefile
+++ b/lib/Target/PTX/Makefile
@@ -12,7 +12,14 @@ LIBRARYNAME = LLVMPTXCodeGen
 TARGET = PTX
 
 # Make sure that tblgen is run, first thing.
-BUILT_SOURCES =
+BUILT_SOURCES = PTXGenAsmWriter.inc \
+		PTXGenDAGISel.inc \
+		PTXGenInstrInfo.inc \
+		PTXGenInstrNames.inc \
+		PTXGenRegisterInfo.inc \
+		PTXGenRegisterInfo.h.inc \
+		PTXGenRegisterNames.inc \
+		PTXGenSubtarget.inc
 
 DIRS = AsmPrinter TargetInfo
 
diff --git a/lib/Target/PTX/PTX.h b/lib/Target/PTX/PTX.h
index 0a7b49ece2..8e77e8d371 100644
--- a/lib/Target/PTX/PTX.h
+++ b/lib/Target/PTX/PTX.h
@@ -18,7 +18,19 @@
 #include "llvm/Target/TargetMachine.h"
 
 namespace llvm {
+  class PTXTargetMachine;
+  class FunctionPass;
+
+  FunctionPass *createPTXISelDag(PTXTargetMachine &TM,
+                                 CodeGenOpt::Level OptLevel);
+
   extern Target ThePTXTarget;
 } // namespace llvm;
 
+// Defines symbolic names for PTX registers.
+#include "PTXGenRegisterNames.inc"
+
+// Defines symbolic names for the PTX instructions.
+#include "PTXGenInstrNames.inc"
+
 #endif // PTX_H
diff --git a/lib/Target/PTX/PTX.td b/lib/Target/PTX/PTX.td
index 5def467e64..8b1a1b18da 100644
--- a/lib/Target/PTX/PTX.td
+++ b/lib/Target/PTX/PTX.td
@@ -8,3 +8,47 @@
 //===----------------------------------------------------------------------===//
 // This is the top level entry point for the PTX target.
 //===----------------------------------------------------------------------===//
+
+//===----------------------------------------------------------------------===//
+// Target-independent interfaces
+//===----------------------------------------------------------------------===//
+
+include "llvm/Target/Target.td"
+
+//===----------------------------------------------------------------------===//
+// Subtarget Features.
+//===----------------------------------------------------------------------===//
+
+def FeatureSM20 : SubtargetFeature<"sm20", "is_sm20", "true",
+                                   "Enable sm_20 target architecture">;
+
+//===----------------------------------------------------------------------===//
+// PTX supported processors.
+//===----------------------------------------------------------------------===//
+
+class Proc<string Name, list<SubtargetFeature> Features>
+  : Processor<Name, NoItineraries, Features>;
+
+def : Proc<"generic", []>;
+
+//===----------------------------------------------------------------------===//
+// Register File Description
+//===----------------------------------------------------------------------===//
+
+include "PTXRegisterInfo.td"
+
+//===----------------------------------------------------------------------===//
+// Instruction Descriptions
+//===----------------------------------------------------------------------===//
+
+include "PTXInstrInfo.td"
+
+def PTXInstrInfo : InstrInfo;
+
+//===----------------------------------------------------------------------===//
+// Target Declaration
+//===----------------------------------------------------------------------===//
+
+def PTX : Target {
+  let InstructionSet = PTXInstrInfo;
+}
diff --git a/lib/Target/PTX/PTXISelDAGToDAG.cpp b/lib/Target/PTX/PTXISelDAGToDAG.cpp
new file mode 100644
index 0000000000..da9136511d
--- /dev/null
+++ b/lib/Target/PTX/PTXISelDAGToDAG.cpp
@@ -0,0 +1,53 @@
+//===-- PTXISelDAGToDAG.cpp - A dag to dag inst selector for PTX ----------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines an instruction selector for the PTX target.
+//
+//===----------------------------------------------------------------------===//
+
+#include "PTX.h"
+#include "PTXTargetMachine.h"
+#include "llvm/CodeGen/SelectionDAGISel.h"
+
+using namespace llvm;
+
+namespace {
+// PTXDAGToDAGISel - PTX specific code to select PTX machine
+// instructions for SelectionDAG operations.
+class PTXDAGToDAGISel : public SelectionDAGISel {
+  public:
+    PTXDAGToDAGISel(PTXTargetMachine &TM, CodeGenOpt::Level OptLevel);
+
+    virtual const char *getPassName() const {
+      return "PTX DAG->DAG Pattern Instruction Selection";
+    }
+
+    SDNode *Select(SDNode *Node);
+
+    // Include the pieces auto'gened from the target description
+#include "PTXGenDAGISel.inc"
+
+}; // class PTXDAGToDAGISel
+} // namespace
+
+// createPTXISelDag - This pass converts a legalized DAG into a
+// PTX-specific DAG, ready for instruction scheduling
+FunctionPass *llvm::createPTXISelDag(PTXTargetMachine &TM,
+                                     CodeGenOpt::Level OptLevel) {
+  return new PTXDAGToDAGISel(TM, OptLevel);
+}
+
+PTXDAGToDAGISel::PTXDAGToDAGISel(PTXTargetMachine &TM,
+                                 CodeGenOpt::Level OptLevel)
+  : SelectionDAGISel(TM, OptLevel) {}
+
+SDNode *PTXDAGToDAGISel::Select(SDNode *Node) {
+  // SelectCode() is auto'gened
+  return SelectCode(Node);
+}
diff --git a/lib/Target/PTX/PTXISelLowering.cpp b/lib/Target/PTX/PTXISelLowering.cpp
new file mode 100644
index 0000000000..9d7e34434e
--- /dev/null
+++ b/lib/Target/PTX/PTXISelLowering.cpp
@@ -0,0 +1,62 @@
+//===-- PTXISelLowering.cpp - PTX DAG Lowering Implementation -------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the PTXTargetLowering class.
+//
+//===----------------------------------------------------------------------===//
+
+#include "PTXISelLowering.h"
+#include "PTXRegisterInfo.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/CodeGen/SelectionDAG.h"
+#include "llvm/CodeGen/TargetLoweringObjectFileImpl.h"
+
+using namespace llvm;
+
+PTXTargetLowering::PTXTargetLowering(TargetMachine &TM)
+  : TargetLowering(TM, new TargetLoweringObjectFileELF()) {
+  // Set up the register classes.
+  addRegisterClass(MVT::i1, PTX::PredsRegisterClass);
+
+  // Compute derived properties from the register classes
+  computeRegisterProperties();
+}
+
+const char *PTXTargetLowering::getTargetNodeName(unsigned Opcode) const {
+  switch (Opcode) {
+    default:           llvm_unreachable("Unknown opcode");
+    case PTXISD::EXIT: return "PTXISD::EXIT";
+  }
+}
+
+//===----------------------------------------------------------------------===//
+//                      Calling Convention Implementation
+//===----------------------------------------------------------------------===//
+
+SDValue PTXTargetLowering::
+  LowerFormalArguments(SDValue Chain,
+                       CallingConv::ID CallConv,
+                       bool isVarArg,
+                       const SmallVectorImpl<ISD::InputArg> &Ins,
+                       DebugLoc dl,
+                       SelectionDAG &DAG,
+                       SmallVectorImpl<SDValue> &InVals) const {
+  return Chain;
+}
+
+SDValue PTXTargetLowering::
+  LowerReturn(SDValue Chain,
+              CallingConv::ID CallConv,
+              bool isVarArg,
+              const SmallVectorImpl<ISD::OutputArg> &Outs,
+              const SmallVectorImpl<SDValue> &OutVals,
+              DebugLoc dl,
+              SelectionDAG &DAG) const {
+  return DAG.getNode(PTXISD::EXIT, dl, MVT::Other, Chain);
+}
diff --git a/lib/Target/PTX/PTXISelLowering.h b/lib/Target/PTX/PTXISelLowering.h
new file mode 100644
index 0000000000..d0978e76a8
--- /dev/null
+++ b/lib/Target/PTX/PTXISelLowering.h
@@ -0,0 +1,60 @@
+//==-- PTXISelLowering.h - PTX DAG Lowering Interface ------------*- C++ -*-==//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines the interfaces that PTX uses to lower LLVM code into a
+// selection DAG.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef PTX_ISEL_LOWERING_H
+#define PTX_ISEL_LOWERING_H
+
+#include "llvm/Target/TargetLowering.h"
+
+namespace llvm {
+class PTXSubtarget;
+class PTXTargetMachine;
+
+namespace PTXISD {
+  enum NodeType {
+    FIRST_NUMBER = ISD::BUILTIN_OP_END,
+    EXIT
+  };
+} // namespace PTXISD
+
+class PTXTargetLowering : public TargetLowering {
+  public:
+    explicit PTXTargetLowering(TargetMachine &TM);
+
+    virtual const char *getTargetNodeName(unsigned Opcode) const;
+
+    virtual unsigned getFunctionAlignment(const Function *F) const {
+      return 2; }
+
+    virtual SDValue
+      LowerFormalArguments(SDValue Chain,
+                           CallingConv::ID CallConv,
+                           bool isVarArg,
+                           const SmallVectorImpl<ISD::InputArg> &Ins,
+                           DebugLoc dl,
+                           SelectionDAG &DAG,
+                           SmallVectorImpl<SDValue> &InVals) const;
+
+    virtual SDValue
+      LowerReturn(SDValue Chain,
+                  CallingConv::ID CallConv,
+                  bool isVarArg,
+                  const SmallVectorImpl<ISD::OutputArg> &Outs,
+                  const SmallVectorImpl<SDValue> &OutVals,
+                  DebugLoc dl,
+                  SelectionDAG &DAG) const;
+}; // class PTXTargetLowering
+} // namespace llvm
+
+#endif // PTX_ISEL_LOWERING_H
diff --git a/lib/Target/PTX/PTXInstrFormats.td b/lib/Target/PTX/PTXInstrFormats.td
new file mode 100644
index 0000000000..e4e099987e
--- /dev/null
+++ b/lib/Target/PTX/PTXInstrFormats.td
@@ -0,0 +1,24 @@
+//===- PTXInstrFormats.td - PTX Instruction Formats ----------*- tblgen -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// PTX Predicate operand, default to (0, 0) = (zero-reg, always).
+// Leave PrintMethod empty; predicate printing is defined elsewhere.
+def pred : PredicateOperand<OtherVT, (ops Preds, i32imm),
+                                     (ops (i1 zero_reg), (i32 0))>;
+
+let Namespace = "PTX" in {
+  class InstPTX<dag oops, dag iops, string asmstr, list<dag> pattern>
+    : Instruction {
+      dag OutOperandList = oops;
+      dag InOperandList = !con(iops, (ins pred:$_p));
+      let AsmString = asmstr; // Predicate printing is defined elsewhere.
+      let Pattern = pattern;
+      let isPredicable = 1;
+  }
+}
diff --git a/lib/Target/PTX/PTXInstrInfo.cpp b/lib/Target/PTX/PTXInstrInfo.cpp
new file mode 100644
index 0000000000..59979dc8df
--- /dev/null
+++ b/lib/Target/PTX/PTXInstrInfo.cpp
@@ -0,0 +1,22 @@
+//===- PTXInstrInfo.cpp - PTX Instruction Information ---------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains the PTX implementation of the TargetInstrInfo class.
+//
+//===----------------------------------------------------------------------===//
+
+#include "PTXInstrInfo.h"
+
+using namespace llvm;
+
+#include "PTXGenInstrInfo.inc"
+
+PTXInstrInfo::PTXInstrInfo(PTXTargetMachine &_TM)
+  : TargetInstrInfoImpl(PTXInsts, array_lengthof(PTXInsts)),
+    RI(_TM, *this), TM(_TM) {}
diff --git a/lib/Target/PTX/PTXInstrInfo.h b/lib/Target/PTX/PTXInstrInfo.h
new file mode 100644
index 0000000000..3832567eb4
--- /dev/null
+++ b/lib/Target/PTX/PTXInstrInfo.h
@@ -0,0 +1,35 @@
+//===- PTXInstrInfo.h - PTX Instruction Information -------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains the PTX implementation of the TargetInstrInfo class.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef PTX_INSTR_INFO_H
+#define PTX_INSTR_INFO_H
+
+#include "PTXRegisterInfo.h"
+#include "llvm/Target/TargetInstrInfo.h"
+
+namespace llvm {
+class PTXTargetMachine;
+
+class PTXInstrInfo : public TargetInstrInfoImpl {
+  private:
+    const PTXRegisterInfo RI;
+    PTXTargetMachine &TM;
+
+  public:
+    explicit PTXInstrInfo(PTXTargetMachine &_TM);
+
+    virtual const PTXRegisterInfo &getRegisterInfo() const { return RI; }
+  }; // class PTXInstrInfo
+} // namespace llvm
+
+#endif // PTX_INSTR_INFO_H
diff --git a/lib/Target/PTX/PTXInstrInfo.td b/lib/Target/PTX/PTXInstrInfo.td
new file mode 100644
index 0000000000..758eff67ba
--- /dev/null
+++ b/lib/Target/PTX/PTXInstrInfo.td
@@ -0,0 +1,33 @@
+//===- PTXInstrInfo.td - PTX Instruction defs -----------------*- tblgen-*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file describes the PTX instructions in TableGen format.
+//
+//===----------------------------------------------------------------------===//
+
+//===----------------------------------------------------------------------===//
+// Instruction format superclass
+//===----------------------------------------------------------------------===//
+
+include "PTXInstrFormats.td"
+
+//===----------------------------------------------------------------------===//
+// PTX Specific Node Definitions
+//===----------------------------------------------------------------------===//
+
+def PTXexit
+  : SDNode<"PTXISD::EXIT", SDTNone, [SDNPHasChain]>;
+
+//===----------------------------------------------------------------------===//
+// Instructions
+//===----------------------------------------------------------------------===//
+
+let isReturn = 1, isTerminator = 1, isBarrier = 1 in {
+  def EXIT : InstPTX<(outs), (ins), "exit", [(PTXexit)]>;
+}
diff --git a/lib/Target/PTX/PTXMCAsmInfo.cpp b/lib/Target/PTX/PTXMCAsmInfo.cpp
new file mode 100644
index 0000000000..b670abdbe0
--- /dev/null
+++ b/lib/Target/PTX/PTXMCAsmInfo.cpp
@@ -0,0 +1,30 @@
+//===-- PTXMCAsmInfo.cpp - PTX asm properties -----------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains the declarations of the PTXMCAsmInfo properties.
+//
+//===----------------------------------------------------------------------===//
+
+#include "PTXMCAsmInfo.h"
+
+using namespace llvm;
+
+PTXMCAsmInfo::PTXMCAsmInfo(const Target &T, const StringRef &TT) {
+  CommentString = "//";
+
+  PrivateGlobalPrefix = "$L__";
+
+  AllowPeriodsInName = false;
+
+  HasSetDirective = false;
+
+  HasDotTypeDotSizeDirective = false;
+
+  HasSingleParameterDotFile = false;
+}
diff --git a/lib/Target/PTX/PTXMCAsmInfo.h b/lib/Target/PTX/PTXMCAsmInfo.h
new file mode 100644
index 0000000000..03f5d66b3d
--- /dev/null
+++ b/lib/Target/PTX/PTXMCAsmInfo.h
@@ -0,0 +1,28 @@
+//=====-- PTXMCAsmInfo.h - PTX asm properties -----------------*- C++ -*--====//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains the declaration of the PTXMCAsmInfo class.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef PTX_MCASM_INFO_H
+#define PTX_MCASM_INFO_H
+
+#include "llvm/MC/MCAsmInfo.h"
+
+namespace llvm {
+  class Target;
+  class StringRef;
+
+  struct PTXMCAsmInfo : public MCAsmInfo {
+    explicit PTXMCAsmInfo(const Target &T, const StringRef &TT);
+  };
+} // namespace llvm
+
+#endif // PTX_MCASM_INFO_H
diff --git a/lib/Target/PTX/PTXRegisterInfo.cpp b/lib/Target/PTX/PTXRegisterInfo.cpp
new file mode 100644
index 0000000000..0f3e7bc2c3
--- /dev/null
+++ b/lib/Target/PTX/PTXRegisterInfo.cpp
@@ -0,0 +1,19 @@
+//===- PTXRegisterInfo.cpp - PTX Register Information ---------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains the PTX implementation of the TargetRegisterInfo class.
+//
+//===----------------------------------------------------------------------===//
+
+#include "PTX.h"
+#include "PTXRegisterInfo.h"
+
+using namespace llvm;
+
+#include "PTXGenRegisterInfo.inc"
diff --git a/lib/Target/PTX/PTXRegisterInfo.h b/lib/Target/PTX/PTXRegisterInfo.h
new file mode 100644
index 0000000000..56d75a39eb
--- /dev/null
+++ b/lib/Target/PTX/PTXRegisterInfo.h
@@ -0,0 +1,68 @@
+//===- PTXRegisterInfo.h - PTX Register Information Impl --------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains the PTX implementation of the MRegisterInfo class.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef PTX_REGISTER_INFO_H
+#define PTX_REGISTER_INFO_H
+
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/ADT/BitVector.h"
+
+#include "PTXGenRegisterInfo.h.inc"
+
+namespace llvm {
+class PTXTargetMachine;
+class MachineFunction;
+
+struct PTXRegisterInfo : public PTXGenRegisterInfo {
+  PTXRegisterInfo(PTXTargetMachine &TM,
+                  const TargetInstrInfo &TII) {}
+
+  virtual const unsigned
+    *getCalleeSavedRegs(const MachineFunction *MF = 0) const {
+    static const unsigned CalleeSavedRegs[] = { 0 };
+    return CalleeSavedRegs; // save nothing
+  }
+
+  virtual BitVector getReservedRegs(const MachineFunction &MF) const {
+    BitVector Reserved(getNumRegs());
+    return Reserved; // reserve no regs
+  }
+
+  virtual bool hasFP(const MachineFunction &MF) const { return false; }
+
+  // FIXME: Given that PTX does not support stack frame, what should we do here?
+  virtual void eliminateFrameIndex(MachineBasicBlock::iterator MI,
+                                   int SPAdj,
+                                   RegScavenger *RS = NULL) const {}
+
+  virtual void emitPrologue(MachineFunction &MF) const {}
+  virtual void emitEpilogue(MachineFunction &MF,
+                            MachineBasicBlock &MBB) const {}
+
+  virtual unsigned getFrameRegister(const MachineFunction &MF) const {
+    llvm_unreachable("PTX does not have a frame register");
+    return 0;
+  }
+
+  virtual unsigned getRARegister() const {
+    llvm_unreachable("PTX does not have a return address register");
+    return 0;
+  }
+
+  virtual int getDwarfRegNum(unsigned RegNum, bool isEH) const {
+    return PTXGenRegisterInfo::getDwarfRegNumFull(RegNum, 0);
+  }
+}; // struct PTXRegisterInfo
+} // namespace llvm
+
+#endif // PTX_REGISTER_INFO_H
diff --git a/lib/Target/PTX/PTXRegisterInfo.td b/lib/Target/PTX/PTXRegisterInfo.td
new file mode 100644
index 0000000000..9346b7193e
--- /dev/null
+++ b/lib/Target/PTX/PTXRegisterInfo.td
@@ -0,0 +1,63 @@
+//===- PTXRegisterInfo.td - PTX Register defs ----------------*- tblgen -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+//===----------------------------------------------------------------------===//
+//  Declarations that describe the PTX register file
+//===----------------------------------------------------------------------===//
+
+class PTXReg<string n> : Register<n> {
+  let Namespace = "PTX";
+}
+
+//===----------------------------------------------------------------------===//
+//  Registers
+//===----------------------------------------------------------------------===//
+
+def P0  : PTXReg<"p0">;
+def P1  : PTXReg<"p1">;
+def P2  : PTXReg<"p2">;
+def P3  : PTXReg<"p3">;
+def P4  : PTXReg<"p4">;
+def P5  : PTXReg<"p5">;
+def P6  : PTXReg<"p6">;
+def P7  : PTXReg<"p7">;
+def P8  : PTXReg<"p8">;
+def P9  : PTXReg<"p9">;
+def P10 : PTXReg<"p10">;
+def P11 : PTXReg<"p11">;
+def P12 : PTXReg<"p12">;
+def P13 : PTXReg<"p13">;
+def P14 : PTXReg<"p14">;
+def P15 : PTXReg<"p15">;
+def P16 : PTXReg<"p16">;
+def P17 : PTXReg<"p17">;
+def P18 : PTXReg<"p18">;
+def P19 : PTXReg<"p19">;
+def P20 : PTXReg<"p20">;
+def P21 : PTXReg<"p21">;
+def P22 : PTXReg<"p22">;
+def P23 : PTXReg<"p23">;
+def P24 : PTXReg<"p24">;
+def P25 : PTXReg<"p25">;
+def P26 : PTXReg<"p26">;
+def P27 : PTXReg<"p27">;
+def P28 : PTXReg<"p28">;
+def P29 : PTXReg<"p29">;
+def P30 : PTXReg<"p30">;
+def P31 : PTXReg<"p31">;
+
+//===----------------------------------------------------------------------===//
+//  Register classes
+//===----------------------------------------------------------------------===//
+
+def Preds : RegisterClass<"PTX", [i1], 8,
+                          [P0, P1, P2, P3, P4, P5, P6, P7,
+                           P8, P9, P10, P11, P12, P13, P14, P15,
+                           P16, P17, P18, P19, P20, P21, P22, P23,
+                           P24, P25, P26, P27, P28, P29, P30, P31]>;
diff --git a/lib/Target/PTX/PTXSubtarget.cpp b/lib/Target/PTX/PTXSubtarget.cpp
new file mode 100644
index 0000000000..00e2c882a5
--- /dev/null
+++ b/lib/Target/PTX/PTXSubtarget.cpp
@@ -0,0 +1,23 @@
+//===- PTXSubtarget.cpp - PTX Subtarget Information ---------------*- C++ -*-=//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the PTX specific subclass of TargetSubtarget.
+//
+//===----------------------------------------------------------------------===//
+
+#include "PTXSubtarget.h"
+
+using namespace llvm;
+
+PTXSubtarget::PTXSubtarget(const std::string &TT, const std::string &FS) {
+  std::string TARGET = "sm_20";
+  // TODO: call ParseSubtargetFeatures(FS, TARGET);
+}
+
+#include "PTXGenSubtarget.inc"
diff --git a/lib/Target/PTX/PTXSubtarget.h b/lib/Target/PTX/PTXSubtarget.h
new file mode 100644
index 0000000000..7fd85f873a
--- /dev/null
+++ b/lib/Target/PTX/PTXSubtarget.h
@@ -0,0 +1,32 @@
+//====-- PTXSubtarget.h - Define Subtarget for the PTX ---------*- C++ -*--===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file declares the PTX specific subclass of TargetSubtarget.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef PTX_SUBTARGET_H
+#define PTX_SUBTARGET_H
+
+#include "llvm/Target/TargetSubtarget.h"
+
+namespace llvm {
+  class PTXSubtarget : public TargetSubtarget {
+    private:
+      bool is_sm20;
+
+    public:
+      PTXSubtarget(const std::string &TT, const std::string &FS);
+
+      std::string ParseSubtargetFeatures(const std::string &FS,
+                                         const std::string &CPU);
+  }; // class PTXSubtarget
+} // namespace llvm
+
+#endif // PTX_SUBTARGET_H
diff --git a/lib/Target/PTX/PTXTargetMachine.cpp b/lib/Target/PTX/PTXTargetMachine.cpp
index 1889df41dc..1e846e5059 100644
--- a/lib/Target/PTX/PTXTargetMachine.cpp
+++ b/lib/Target/PTX/PTXTargetMachine.cpp
@@ -12,20 +12,32 @@
 //===----------------------------------------------------------------------===//
 
 #include "PTX.h"
+#include "PTXMCAsmInfo.h"
 #include "PTXTargetMachine.h"
+#include "llvm/PassManager.h"
 #include "llvm/Target/TargetRegistry.h"
 
 using namespace llvm;
 
-extern "C" void LLVMInitializePTXTarget()
-{
-  // Register the target
+extern "C" void LLVMInitializePTXTarget() {
   RegisterTargetMachine<PTXTargetMachine> X(ThePTXTarget);
+  RegisterAsmInfo<PTXMCAsmInfo> Y(ThePTXTarget);
 }
 
+// DataLayout and FrameInfo are filled with dummy data
 PTXTargetMachine::PTXTargetMachine(const Target &T,
                                    const std::string &TT,
-                                   const std::string &FS) :
-  LLVMTargetMachine(T, TT)
-{
+                                   const std::string &FS)
+  : LLVMTargetMachine(T, TT),
+    DataLayout("e-p:32:32-i64:32:32-f64:32:32-v128:32:128-v64:32:64-n32:64"),
+    FrameInfo(TargetFrameInfo::StackGrowsDown, 2, -2),
+    InstrInfo(*this),
+    TLInfo(*this),
+    Subtarget(TT, FS) {
+}
+
+bool PTXTargetMachine::addInstSelector(PassManagerBase &PM,
+                                       CodeGenOpt::Level OptLevel) {
+  PM.add(createPTXISelDag(*this, OptLevel));
+  return false;
 }
diff --git a/lib/Target/PTX/PTXTargetMachine.h b/lib/Target/PTX/PTXTargetMachine.h
index c447b87478..b1379b4cdb 100644
--- a/lib/Target/PTX/PTXTargetMachine.h
+++ b/lib/Target/PTX/PTXTargetMachine.h
@@ -14,14 +14,42 @@
 #ifndef PTX_TARGET_MACHINE_H
 #define PTX_TARGET_MACHINE_H
 
+#include "PTXISelLowering.h"
+#include "PTXInstrInfo.h"
+#include "PTXSubtarget.h"
+#include "llvm/Target/TargetData.h"
+#include "llvm/Target/TargetFrameInfo.h"
 #include "llvm/Target/TargetMachine.h"
 
 namespace llvm {
-  class PTXTargetMachine : public LLVMTargetMachine {
-    public:
-      PTXTargetMachine(const Target &T, const std::string &TT,
-                       const std::string &FS);
-  }; // class PTXTargetMachine
+class PTXTargetMachine : public LLVMTargetMachine {
+  private:
+    const TargetData DataLayout;
+    TargetFrameInfo FrameInfo;
+    PTXInstrInfo InstrInfo;
+    PTXTargetLowering TLInfo;
+    PTXSubtarget Subtarget;
+
+  public:
+    PTXTargetMachine(const Target &T, const std::string &TT,
+                     const std::string &FS);
+
+    virtual const TargetData *getTargetData() const { return &DataLayout; }
+
+    virtual const TargetFrameInfo *getFrameInfo() const { return &FrameInfo; }
+
+    virtual const PTXInstrInfo *getInstrInfo() const { return &InstrInfo; }
+    virtual const TargetRegisterInfo *getRegisterInfo() const {
+      return &InstrInfo.getRegisterInfo(); }
+
+    virtual const PTXTargetLowering *getTargetLowering() const {
+      return &TLInfo; }
+
+    virtual const PTXSubtarget *getSubtargetImpl() const { return &Subtarget; }
+
+    virtual bool addInstSelector(PassManagerBase &PM,
+                                 CodeGenOpt::Level OptLevel);
+}; // class PTXTargetMachine
 } // namespace llvm
 
 #endif // PTX_TARGET_MACHINE_H
diff --git a/lib/Target/PTX/TargetInfo/PTXTargetInfo.cpp b/lib/Target/PTX/TargetInfo/PTXTargetInfo.cpp
index 9000ae70e4..a577d7755a 100644
--- a/lib/Target/PTX/TargetInfo/PTXTargetInfo.cpp
+++ b/lib/Target/PTX/TargetInfo/PTXTargetInfo.cpp
@@ -15,8 +15,7 @@ using namespace llvm;
 
 Target llvm::ThePTXTarget;
 
-extern "C" void LLVMInitializePTXTargetInfo()
-{
+extern "C" void LLVMInitializePTXTargetInfo() {
   // see llvm/ADT/Triple.h
   RegisterTarget<Triple::ptx> X(ThePTXTarget, "ptx", "PTX");
 }