Add XCore backend.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@58838 91177308-0d34-0410-b5e6-96231b3b80d8

25 files changed, 4954 insertions, 0 deletions

diff --git a/lib/Target/XCore/CMakeLists.txt b/lib/Target/XCore/CMakeLists.txt
new file mode 100644
index 0000000000..a7aba14a7a
--- /dev/null
+++ b/lib/Target/XCore/CMakeLists.txt
@@ -0,0 +1,23 @@
+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(XCoreGenInstrNames.inc -gen-instr-enums)
+tablegen(XCoreGenInstrInfo.inc -gen-instr-desc)
+tablegen(XCoreGenAsmWriter.inc -gen-asm-writer)
+tablegen(XCoreGenDAGISel.inc -gen-dag-isel)
+tablegen(XCoreGenCallingConv.inc -gen-callingconv)
+tablegen(XCoreGenSubtarget.inc -gen-subtarget)
+
+add_llvm_target(XCore
+  XCoreAsmPrinter.cpp
+  XCoreFrameInfo.cpp
+  XCoreInstrInfo.cpp
+  XCoreISelDAGToDAG.cpp
+  XCoreISelLowering.cpp
+  XCoreRegisterInfo.cpp
+  XCoreSubtarget.cpp
+  XCoreTargetAsmInfo.cpp
+  XCoreTargetMachine.cpp
+  )
diff --git a/lib/Target/XCore/README.txt b/lib/Target/XCore/README.txt
new file mode 100644
index 0000000000..deaeb0f2a9
--- /dev/null
+++ b/lib/Target/XCore/README.txt
@@ -0,0 +1,8 @@
+To-do
+-----
+
+* Instruction encodings
+* Tailcalls
+* Investigate loop alignment
+* Add builtins
+* Make better use of lmul / macc
diff --git a/lib/Target/XCore/XCore.h b/lib/Target/XCore/XCore.h
new file mode 100644
index 0000000000..347ac47ac3
--- /dev/null
+++ b/lib/Target/XCore/XCore.h
@@ -0,0 +1,38 @@
+//===-- XCore.h - Top-level interface for XCore representation --*- 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 entry points for global functions defined in the LLVM
+// XCore back-end.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef TARGET_XCORE_H
+#define TARGET_XCORE_H
+
+namespace llvm {
+  class FunctionPass;
+  class TargetMachine;
+  class XCoreTargetMachine;
+  class raw_ostream;
+
+  FunctionPass *createXCoreISelDag(XCoreTargetMachine &TM);
+  FunctionPass *createXCoreCodePrinterPass(raw_ostream &OS,
+                                           XCoreTargetMachine &TM);
+} // end namespace llvm;
+
+// Defines symbolic names for XCore registers.  This defines a mapping from
+// register name to register number.
+//
+#include "XCoreGenRegisterNames.inc"
+
+// Defines symbolic names for the XCore instructions.
+//
+#include "XCoreGenInstrNames.inc"
+
+#endif
diff --git a/lib/Target/XCore/XCore.td b/lib/Target/XCore/XCore.td
new file mode 100644
index 0000000000..39c4226b61
--- /dev/null
+++ b/lib/Target/XCore/XCore.td
@@ -0,0 +1,62 @@
+//===- XCore.td - Describe the XCore Target Machine --------*- tablegen -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+//
+//===----------------------------------------------------------------------===//
+
+//===----------------------------------------------------------------------===//
+// Target-independent interfaces which we are implementing
+//===----------------------------------------------------------------------===//
+
+include "../Target.td"
+
+//===----------------------------------------------------------------------===//
+// Descriptions
+//===----------------------------------------------------------------------===//
+
+include "XCoreRegisterInfo.td"
+include "XCoreInstrInfo.td"
+include "XCoreCallingConv.td"
+
+def XCoreInstrInfo : InstrInfo {
+  let TSFlagsFields = [];
+  let TSFlagsShifts = [];
+}
+
+//===----------------------------------------------------------------------===//
+// XCore Subtarget features.
+//===----------------------------------------------------------------------===//
+
+def FeatureXS1A
+  : SubtargetFeature<"xs1a", "IsXS1A", "true",
+                     "Enable XS1A instructions">;
+
+def FeatureXS1B
+  : SubtargetFeature<"xs1b", "IsXS1B", "true",
+                     "Enable XS1B instructions">;
+
+//===----------------------------------------------------------------------===//
+// XCore processors supported.
+//===----------------------------------------------------------------------===//
+
+class Proc<string Name, list<SubtargetFeature> Features>
+ : Processor<Name, NoItineraries, Features>;
+
+def : Proc<"generic",      [FeatureXS1A]>;
+def : Proc<"xs1a-generic", [FeatureXS1A]>;
+def : Proc<"xs1b-generic", [FeatureXS1B]>;
+
+//===----------------------------------------------------------------------===//
+// Declare the target which we are implementing
+//===----------------------------------------------------------------------===//
+
+def XCore : Target {
+  // Pull in Instruction Info:
+  let InstructionSet = XCoreInstrInfo;
+}
diff --git a/lib/Target/XCore/XCoreAsmPrinter.cpp b/lib/Target/XCore/XCoreAsmPrinter.cpp
new file mode 100644
index 0000000000..519b38bdfa
--- /dev/null
+++ b/lib/Target/XCore/XCoreAsmPrinter.cpp
@@ -0,0 +1,459 @@
+//===-- XCoreAsmPrinter.cpp - XCore LLVM assembly writer ------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains a printer that converts from our internal representation
+// of machine-dependent LLVM code to the XAS-format XCore assembly language.
+//
+//===----------------------------------------------------------------------===//
+
+#define DEBUG_TYPE "asm-printer"
+#include "XCore.h"
+#include "XCoreInstrInfo.h"
+#include "XCoreSubtarget.h"
+#include "XCoreTargetMachine.h"
+#include "llvm/Constants.h"
+#include "llvm/DerivedTypes.h"
+#include "llvm/Module.h"
+#include "llvm/CodeGen/AsmPrinter.h"
+#include "llvm/CodeGen/DwarfWriter.h"
+#include "llvm/CodeGen/MachineModuleInfo.h"
+#include "llvm/CodeGen/MachineFunctionPass.h"
+#include "llvm/CodeGen/MachineConstantPool.h"
+#include "llvm/CodeGen/MachineInstr.h"
+#include "llvm/Target/TargetAsmInfo.h"
+#include "llvm/Target/TargetData.h"
+#include "llvm/Support/Mangler.h"
+#include "llvm/ADT/Statistic.h"
+#include "llvm/ADT/StringExtras.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/MathExtras.h"
+#include "llvm/Support/raw_ostream.h"
+#include <algorithm>
+#include <cctype>
+using namespace llvm;
+
+STATISTIC(EmittedInsts, "Number of machine instrs printed");
+
+static cl::opt<std::string> FileDirective("xcore-file-directive", cl::Optional,
+  cl::desc("Output a file directive into the assembly file"),
+  cl::Hidden,
+  cl::value_desc("filename"),
+  cl::init(""));
+
+static cl::opt<unsigned> MaxThreads("xcore-max-threads", cl::Optional,
+  cl::desc("Maximum number of threads (for emulation thread-local storage)"),
+  cl::Hidden,
+  cl::value_desc("number"),
+  cl::init(8));
+
+namespace {
+  struct VISIBILITY_HIDDEN XCoreAsmPrinter : public AsmPrinter {
+    XCoreAsmPrinter(raw_ostream &O, XCoreTargetMachine &TM,
+                    const TargetAsmInfo *T)
+      : AsmPrinter(O, TM, T), DW(O, this, T),
+        Subtarget(*TM.getSubtargetImpl()) { }
+
+    DwarfWriter DW;
+    const XCoreSubtarget &Subtarget;
+
+    virtual const char *getPassName() const {
+      return "XCore Assembly Printer";
+    }
+
+    void printMemOperand(const MachineInstr *MI, int opNum);
+    void printOperand(const MachineInstr *MI, int opNum);
+    bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
+                        unsigned AsmVariant, const char *ExtraCode);
+    
+    void emitFileDirective(const std::string &filename);
+    void emitGlobalDirective(const std::string &name);
+    void emitExternDirective(const std::string &name);
+    
+    void emitArrayBound(const std::string &name, const GlobalVariable *GV);
+    void emitGlobal(const GlobalVariable *GV);
+
+    void emitFunctionStart(MachineFunction &MF);
+    void emitFunctionEnd(MachineFunction &MF);
+
+    bool printInstruction(const MachineInstr *MI);  // autogenerated.
+    void printMachineInstruction(const MachineInstr *MI);
+    bool runOnMachineFunction(MachineFunction &F);
+    bool doInitialization(Module &M);
+    bool doFinalization(Module &M);
+    
+    void getAnalysisUsage(AnalysisUsage &AU) const {
+      AsmPrinter::getAnalysisUsage(AU);
+      AU.setPreservesAll();
+      AU.addRequired<MachineModuleInfo>();
+    }
+  };
+} // end of anonymous namespace
+
+#include "XCoreGenAsmWriter.inc"
+
+/// createXCoreCodePrinterPass - Returns a pass that prints the XCore
+/// assembly code for a MachineFunction to the given output stream,
+/// using the given target machine description.  This should work
+/// regardless of whether the function is in SSA form.
+///
+FunctionPass *llvm::createXCoreCodePrinterPass(raw_ostream &o,
+                                               XCoreTargetMachine &tm) {
+  return new XCoreAsmPrinter(o, tm, tm.getTargetAsmInfo());
+}
+
+// PrintEscapedString - Print each character of the specified string, escaping
+// it if it is not printable or if it is an escape char.
+static void PrintEscapedString(const std::string &Str, raw_ostream &Out) {
+  for (unsigned i = 0, e = Str.size(); i != e; ++i) {
+    unsigned char C = Str[i];
+    if (isprint(C) && C != '"' && C != '\\') {
+      Out << C;
+    } else {
+      Out << '\\'
+          << (char) ((C/16  < 10) ? ( C/16 +'0') : ( C/16 -10+'A'))
+          << (char)(((C&15) < 10) ? ((C&15)+'0') : ((C&15)-10+'A'));
+    }
+  }
+}
+
+void XCoreAsmPrinter::
+emitFileDirective(const std::string &name)
+{
+  O << "\t.file\t\"";
+  PrintEscapedString(name, O);
+  O << "\"\n";
+}
+
+void XCoreAsmPrinter::
+emitGlobalDirective(const std::string &name)
+{
+  O << TAI->getGlobalDirective() << name;
+  O << "\n";
+}
+
+void XCoreAsmPrinter::
+emitExternDirective(const std::string &name)
+{
+  O << "\t.extern\t" << name;
+  O << '\n';
+}
+
+void XCoreAsmPrinter::
+emitArrayBound(const std::string &name, const GlobalVariable *GV)
+{
+  assert((GV->hasExternalLinkage() ||
+    GV->hasWeakLinkage()) ||
+    GV->hasLinkOnceLinkage() && "Unexpected linkage");
+  if (const ArrayType *ATy = dyn_cast<ArrayType>(
+    cast<PointerType>(GV->getType())->getElementType()))
+  {
+    O << TAI->getGlobalDirective() << name << ".globound" << "\n";
+    O << TAI->getSetDirective() << name << ".globound" << ","
+      << ATy->getNumElements() << "\n";
+    if (GV->hasWeakLinkage() || GV->hasLinkOnceLinkage()) {
+      // TODO Use COMDAT groups for LinkOnceLinkage
+      O << TAI->getWeakDefDirective() << name << ".globound" << "\n";
+    }
+  }
+}
+
+void XCoreAsmPrinter::
+emitGlobal(const GlobalVariable *GV)
+{
+  const TargetData *TD = TM.getTargetData();
+
+  if (GV->hasInitializer()) {
+    // Check to see if this is a special global used by LLVM, if so, emit it.
+    if (EmitSpecialLLVMGlobal(GV))
+      return;
+
+    SwitchToSection(TAI->SectionForGlobal(GV));
+    
+    std::string name = Mang->getValueName(GV);
+    Constant *C = GV->getInitializer();
+    unsigned Align = (unsigned)TD->getPreferredTypeAlignmentShift(C->getType());
+    
+    // Mark the start of the global
+    O << "\t.cc_top " << name << ".data," << name << "\n";
+
+    switch (GV->getLinkage()) {
+    case GlobalValue::AppendingLinkage:
+      cerr << "AppendingLinkage is not supported by this target!\n";
+      abort();
+    case GlobalValue::LinkOnceLinkage:
+    case GlobalValue::WeakLinkage:
+    case GlobalValue::ExternalLinkage:
+      emitArrayBound(name, GV);
+      emitGlobalDirective(name);
+      // TODO Use COMDAT groups for LinkOnceLinkage
+      if (GV->hasWeakLinkage() || GV->hasLinkOnceLinkage()) {
+        O << TAI->getWeakDefDirective() << name << "\n";
+      }
+      // FALL THROUGH
+    case GlobalValue::InternalLinkage:
+      break;
+    case GlobalValue::GhostLinkage:
+      cerr << "Should not have any unmaterialized functions!\n";
+      abort();
+    case GlobalValue::DLLImportLinkage:
+      cerr << "DLLImport linkage is not supported by this target!\n";
+      abort();
+    case GlobalValue::DLLExportLinkage:
+      cerr << "DLLExport linkage is not supported by this target!\n";
+      abort();
+    default:
+      assert(0 && "Unknown linkage type!");
+    }
+
+    EmitAlignment(Align, GV, 2);
+    
+    unsigned Size = TD->getABITypeSize(C->getType());
+    if (GV->isThreadLocal()) {
+      Size *= MaxThreads;
+    }
+    if (TAI->hasDotTypeDotSizeDirective()) {
+      O << "\t.type " << name << ",@object\n";
+      O << "\t.size " << name << "," << Size << "\n";
+    }
+    O << name << ":\n";
+    
+    EmitGlobalConstant(C);
+    if (GV->isThreadLocal()) {
+      for (unsigned i = 1; i < MaxThreads; ++i) {
+        EmitGlobalConstant(C);
+      }
+    }
+    if (Size < 4) {
+      // The ABI requires that unsigned scalar types smaller than 32 bits
+      // are are padded to 32 bits.
+      EmitZeros(4 - Size);
+    }
+    
+    // Mark the end of the global
+    O << "\t.cc_bottom " << name << ".data\n";
+  } else {
+    if (GV->hasExternalWeakLinkage())
+      ExtWeakSymbols.insert(GV);
+  }
+}
+
+/// Emit the directives on the start of functions
+void XCoreAsmPrinter::
+emitFunctionStart(MachineFunction &MF)
+{
+  // Print out the label for the function.
+  const Function *F = MF.getFunction();
+
+  SwitchToSection(TAI->SectionForGlobal(F));
+  
+  // Mark the start of the function
+  O << "\t.cc_top " << CurrentFnName << ".function," << CurrentFnName << "\n";
+
+  switch (F->getLinkage()) {
+  default: assert(0 && "Unknown linkage type!");
+  case Function::InternalLinkage:  // Symbols default to internal.
+    break;
+  case Function::ExternalLinkage:
+    emitGlobalDirective(CurrentFnName);
+    break;
+  case Function::LinkOnceLinkage:
+  case Function::WeakLinkage:
+    // TODO Use COMDAT groups for LinkOnceLinkage
+    O << TAI->getGlobalDirective() << CurrentFnName << "\n";
+    O << TAI->getWeakDefDirective() << CurrentFnName << "\n";
+    break;
+  }
+  // (1 << 1) byte aligned
+  EmitAlignment(1, F, 1);
+  if (TAI->hasDotTypeDotSizeDirective()) {
+    O << "\t.type " << CurrentFnName << ",@function\n";
+  }
+  O << CurrentFnName << ":\n";
+}
+
+/// Emit the directives on the end of functions
+void XCoreAsmPrinter::
+emitFunctionEnd(MachineFunction &MF) 
+{
+  // Mark the end of the function
+  O << "\t.cc_bottom " << CurrentFnName << ".function\n";
+}
+
+/// runOnMachineFunction - This uses the printMachineInstruction()
+/// method to print assembly for each instruction.
+///
+bool XCoreAsmPrinter::runOnMachineFunction(MachineFunction &MF)
+{
+  SetupMachineFunction(MF);
+
+  // Print out constants referenced by the function
+  EmitConstantPool(MF.getConstantPool());
+
+  // Print out jump tables referenced by the function
+  EmitJumpTableInfo(MF.getJumpTableInfo(), MF);
+
+  // What's my mangled name?
+  CurrentFnName = Mang->getValueName(MF.getFunction());
+
+  // Emit the function start directives
+  emitFunctionStart(MF);
+  
+  // Emit pre-function debug information.
+  DW.BeginFunction(&MF);
+
+  // Print out code for the function.
+  for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
+       I != E; ++I) {
+
+    // Print a label for the basic block.
+    if (I != MF.begin()) {
+      printBasicBlockLabel(I, true , true);
+      O << '\n';
+    }
+
+    for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
+         II != E; ++II) {
+      // Print the assembly for the instruction.
+      O << "\t";
+      printMachineInstruction(II);
+    }
+
+    // Each Basic Block is separated by a newline
+    O << '\n';
+  }
+
+  // Emit function end directives
+  emitFunctionEnd(MF);
+  
+  // Emit post-function debug information.
+  DW.EndFunction(&MF);
+
+  // We didn't modify anything.
+  return false;
+}
+
+void XCoreAsmPrinter::printMemOperand(const MachineInstr *MI, int opNum)
+{
+  printOperand(MI, opNum);
+  
+  if (MI->getOperand(opNum+1).isImm()
+    && MI->getOperand(opNum+1).getImm() == 0)
+    return;
+  
+  O << "+";
+  printOperand(MI, opNum+1);
+}
+
+void XCoreAsmPrinter::printOperand(const MachineInstr *MI, int opNum) {
+  const MachineOperand &MO = MI->getOperand(opNum);
+  switch (MO.getType()) {
+  case MachineOperand::MO_Register:
+    if (TargetRegisterInfo::isPhysicalRegister(MO.getReg()))
+      O << TM.getRegisterInfo()->get(MO.getReg()).AsmName;
+    else
+      assert(0 && "not implemented");
+    break;
+  case MachineOperand::MO_Immediate:
+    O << MO.getImm();
+    break;
+  case MachineOperand::MO_MachineBasicBlock:
+    printBasicBlockLabel(MO.getMBB());
+    break;
+  case MachineOperand::MO_GlobalAddress:
+    O << Mang->getValueName(MO.getGlobal());
+    if (MO.getGlobal()->hasExternalWeakLinkage())
+      ExtWeakSymbols.insert(MO.getGlobal());
+    break;
+  case MachineOperand::MO_ExternalSymbol:
+    O << MO.getSymbolName();
+    break;
+  case MachineOperand::MO_ConstantPoolIndex:
+    O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber()
+      << '_' << MO.getIndex();
+    break;
+  case MachineOperand::MO_JumpTableIndex:
+    O << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
+      << '_' << MO.getIndex();
+    break;
+  default:
+    assert(0 && "not implemented");
+  }
+}
+
+/// PrintAsmOperand - Print out an operand for an inline asm expression.
+///
+bool XCoreAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
+                                      unsigned AsmVariant, 
+                                      const char *ExtraCode) {
+  printOperand(MI, OpNo);
+  return false;
+}
+
+void XCoreAsmPrinter::printMachineInstruction(const MachineInstr *MI) {
+  ++EmittedInsts;
+
+  // Check for mov mnemonic
+  unsigned src, dst;
+  if (TM.getInstrInfo()->isMoveInstr(*MI, src, dst)) {
+    O << "\tmov ";
+    O << TM.getRegisterInfo()->get(dst).AsmName;
+    O << ", ";
+    O << TM.getRegisterInfo()->get(src).AsmName;
+    O << "\n";
+    return;
+  }
+  if (printInstruction(MI)) {
+    return;
+  }
+  assert(0 && "Unhandled instruction in asm writer!");
+}
+
+bool XCoreAsmPrinter::doInitialization(Module &M) {
+  bool Result = AsmPrinter::doInitialization(M);
+  
+  if (!FileDirective.empty()) {
+    emitFileDirective(FileDirective);
+  }
+  
+  // Print out type strings for external functions here
+  for (Module::const_iterator I = M.begin(), E = M.end();
+       I != E; ++I) {
+    if (I->isDeclaration() && !I->isIntrinsic()) {
+      switch (I->getLinkage()) {
+      default:
+        assert(0 && "Unexpected linkage");
+      case Function::ExternalWeakLinkage:
+        ExtWeakSymbols.insert(I);
+        // fallthrough
+      case Function::ExternalLinkage:
+        break;
+      }
+    }
+  }
+
+  // Emit initial debug information.
+  DW.BeginModule(&M);
+
+  DW.SetModuleInfo(getAnalysisToUpdate<MachineModuleInfo>());
+  return Result;
+}
+
+bool XCoreAsmPrinter::doFinalization(Module &M) {
+
+  // Print out module-level global variables.
+  for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
+       I != E; ++I) {
+    emitGlobal(I);
+  }
+  
+  // Emit final debug information.
+  DW.EndModule();
+
+  return AsmPrinter::doFinalization(M);
+}
diff --git a/lib/Target/XCore/XCoreCallingConv.td b/lib/Target/XCore/XCoreCallingConv.td
new file mode 100644
index 0000000000..8107e329bd
--- /dev/null
+++ b/lib/Target/XCore/XCoreCallingConv.td
@@ -0,0 +1,33 @@
+//===- XCoreCallingConv.td - Calling Conventions for XCore -*- tablegen -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+// This describes the calling conventions for XCore architecture.
+//===----------------------------------------------------------------------===//
+
+//===----------------------------------------------------------------------===//
+// XCore Return Value Calling Convention
+//===----------------------------------------------------------------------===//
+def RetCC_XCore : CallingConv<[
+  // i32 are returned in registers R0, R1, R2, R3
+  CCIfType<[i32], CCAssignToReg<[R0, R1, R2, R3]>>
+]>;
+
+//===----------------------------------------------------------------------===//
+// XCore Argument Calling Conventions
+//===----------------------------------------------------------------------===//
+def CC_XCore : CallingConv<[
+  // Promote i8/i16 arguments to i32.
+  CCIfType<[i8, i16], CCPromoteToType<i32>>,
+
+  // The first 4 integer arguments are passed in integer registers.
+  CCIfType<[i32], CCAssignToReg<[R0, R1, R2, R3]>>,
+
+  // Integer values get stored in stack slots that are 4 bytes in
+  // size and 4-byte aligned.
+  CCIfType<[i32], CCAssignToStack<4, 4>>
+]>;
diff --git a/lib/Target/XCore/XCoreFrameInfo.cpp b/lib/Target/XCore/XCoreFrameInfo.cpp
new file mode 100644
index 0000000000..f50dc96c6b
--- /dev/null
+++ b/lib/Target/XCore/XCoreFrameInfo.cpp
@@ -0,0 +1,27 @@
+//===-- XCoreFrameInfo.cpp - Frame info for XCore Target ---------*- 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 XCore frame information that doesn't fit anywhere else
+// cleanly...
+//
+//===----------------------------------------------------------------------===//
+
+#include "XCore.h"
+#include "XCoreFrameInfo.h"
+using namespace llvm;
+
+//===----------------------------------------------------------------------===//
+// XCoreFrameInfo:
+//===----------------------------------------------------------------------===//
+
+XCoreFrameInfo::XCoreFrameInfo(const TargetMachine &tm):
+  TargetFrameInfo(TargetFrameInfo::StackGrowsDown, 4, 0)
+{
+  // Do nothing
+}
diff --git a/lib/Target/XCore/XCoreFrameInfo.h b/lib/Target/XCore/XCoreFrameInfo.h
new file mode 100644
index 0000000000..2c67577181
--- /dev/null
+++ b/lib/Target/XCore/XCoreFrameInfo.h
@@ -0,0 +1,34 @@
+//===-- XCoreFrameInfo.h - Frame info for XCore Target -----------*- 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 XCore frame information that doesn't fit anywhere else
+// cleanly...
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef XCOREFRAMEINFO_H
+#define XCOREFRAMEINFO_H
+
+#include "llvm/Target/TargetFrameInfo.h"
+#include "llvm/Target/TargetMachine.h"
+
+namespace llvm {
+  class XCoreFrameInfo: public TargetFrameInfo {
+
+  public:
+    XCoreFrameInfo(const TargetMachine &tm);
+
+    //! Stack slot size (4 bytes)
+    static int stackSlotSize() {
+      return 4;
+    }
+  };
+}
+
+#endif // XCOREFRAMEINFO_H
diff --git a/lib/Target/XCore/XCoreISelDAGToDAG.cpp b/lib/Target/XCore/XCoreISelDAGToDAG.cpp
new file mode 100644
index 0000000000..338f98e385
--- /dev/null
+++ b/lib/Target/XCore/XCoreISelDAGToDAG.cpp
@@ -0,0 +1,228 @@
+//===-- XCoreISelDAGToDAG.cpp - A dag to dag inst selector for XCore ------===//
+//
+//                     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 XCore target.
+//
+//===----------------------------------------------------------------------===//
+
+#include "XCore.h"
+#include "XCoreISelLowering.h"
+#include "XCoreTargetMachine.h"
+#include "llvm/DerivedTypes.h"
+#include "llvm/Function.h"
+#include "llvm/Intrinsics.h"
+#include "llvm/CallingConv.h"
+#include "llvm/Constants.h"
+#include "llvm/CodeGen/MachineFrameInfo.h"
+#include "llvm/CodeGen/MachineFunction.h"
+#include "llvm/CodeGen/MachineInstrBuilder.h"
+#include "llvm/CodeGen/MachineRegisterInfo.h"
+#include "llvm/CodeGen/SelectionDAG.h"
+#include "llvm/CodeGen/SelectionDAGISel.h"
+#include "llvm/Target/TargetLowering.h"
+#include "llvm/Support/Compiler.h"
+#include "llvm/Support/Debug.h"
+#include <queue>
+#include <set>
+using namespace llvm;
+
+/// XCoreDAGToDAGISel - XCore specific code to select XCore machine
+/// instructions for SelectionDAG operations.
+///
+namespace {
+  class XCoreDAGToDAGISel : public SelectionDAGISel {
+    XCoreTargetLowering &Lowering;
+    const XCoreSubtarget &Subtarget;
+
+  public:
+    XCoreDAGToDAGISel(XCoreTargetMachine &TM)
+      : SelectionDAGISel(*TM.getTargetLowering()),
+        Lowering(*TM.getTargetLowering()), 
+        Subtarget(*TM.getSubtargetImpl()) { }
+
+    SDNode *Select(SDValue Op);
+    
+    /// getI32Imm - Return a target constant with the specified value, of type
+    /// i32.
+    inline SDValue getI32Imm(unsigned Imm) {
+      return CurDAG->getTargetConstant(Imm, MVT::i32);
+    }
+
+    // Complex Pattern Selectors.
+    bool SelectADDRspii(SDValue Op, SDValue Addr, SDValue &Base,
+                        SDValue &Offset);
+    bool SelectADDRdpii(SDValue Op, SDValue Addr, SDValue &Base,
+                        SDValue &Offset);
+    bool SelectADDRcpii(SDValue Op, SDValue Addr, SDValue &Base,
+                        SDValue &Offset);
+    
+    virtual void InstructionSelect();
+
+    virtual const char *getPassName() const {
+      return "XCore DAG->DAG Pattern Instruction Selection";
+    } 
+    
+    // Include the pieces autogenerated from the target description.
+  #include "XCoreGenDAGISel.inc"
+  };
+}  // end anonymous namespace
+
+/// createXCoreISelDag - This pass converts a legalized DAG into a 
+/// XCore-specific DAG, ready for instruction scheduling.
+///
+FunctionPass *llvm::createXCoreISelDag(XCoreTargetMachine &TM) {
+  return new XCoreDAGToDAGISel(TM);
+}
+
+bool XCoreDAGToDAGISel::SelectADDRspii(SDValue Op, SDValue Addr,
+                                  SDValue &Base, SDValue &Offset) {
+  FrameIndexSDNode *FIN = 0;
+  if (FIN = dyn_cast<FrameIndexSDNode>(Addr)) {
+    Base = CurDAG->getTargetFrameIndex(FIN->getIndex(), MVT::i32);
+    Offset = CurDAG->getTargetConstant(0, MVT::i32);
+    return true;
+  }
+  if (Addr.getOpcode() == ISD::ADD) {
+    ConstantSDNode *CN = 0;
+    if ((FIN = dyn_cast<FrameIndexSDNode>(Addr.getOperand(0)))
+      && (CN = dyn_cast<ConstantSDNode>(Addr.getOperand(1)))
+      && (CN->getSExtValue() % 4 == 0)) {
+      // Constant word offset from frame pointer
+      Base = CurDAG->getTargetFrameIndex(FIN->getIndex(), MVT::i32);
+      Offset = CurDAG->getTargetConstant(CN->getSExtValue(), MVT::i32);
+      return true;
+    }
+  }
+  return false;
+}
+
+bool XCoreDAGToDAGISel::SelectADDRdpii(SDValue Op, SDValue Addr,
+                                  SDValue &Base, SDValue &Offset) {
+  if (Addr.getOpcode() == XCoreISD::DPRelativeWrapper) {
+    Base = Addr.getOperand(0);
+    Offset = CurDAG->getTargetConstant(0, MVT::i32);
+    return true;</