lib/Target/SparcV9/SparcV9Internals.h

//***************************************************************************
// File:
//	SparcInternals.h
// 
// Purpose:
//       This file defines stuff that is to be private to the Sparc
//       backend, but is shared among different portions of the backend.
//**************************************************************************/


#ifndef SPARC_INTERNALS_H
#define SPARC_INTERNALS_H

#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/MachineSchedInfo.h"
#include "llvm/Target/MachineFrameInfo.h"
#include "llvm/Target/MachineCacheInfo.h"
#include "llvm/Target/MachineRegInfo.h"
#include "llvm/Type.h"
#include <sys/types.h>

class LiveRange;
class UltraSparc;
class PhyRegAlloc;
class Pass;

Pass *createPrologEpilogCodeInserter(TargetMachine &TM);

// OpCodeMask definitions for the Sparc V9
// 
const OpCodeMask	Immed		= 0x00002000; // immed or reg operand?
const OpCodeMask	Annul		= 0x20000000; // annul delay instr?
const OpCodeMask	PredictTaken	= 0x00080000; // predict branch taken?


enum SparcInstrSchedClass {
  SPARC_NONE,		/* Instructions with no scheduling restrictions */
  SPARC_IEUN,		/* Integer class that can use IEU0 or IEU1 */
  SPARC_IEU0,		/* Integer class IEU0 */
  SPARC_IEU1,		/* Integer class IEU1 */
  SPARC_FPM,		/* FP Multiply or Divide instructions */
  SPARC_FPA,		/* All other FP instructions */	
  SPARC_CTI,		/* Control-transfer instructions */
  SPARC_LD,		/* Load instructions */
  SPARC_ST,		/* Store instructions */
  SPARC_SINGLE,		/* Instructions that must issue by themselves */
  
  SPARC_INV,		/* This should stay at the end for the next value */
  SPARC_NUM_SCHED_CLASSES = SPARC_INV
};


//---------------------------------------------------------------------------
// enum SparcMachineOpCode. 
// const MachineInstrDescriptor SparcMachineInstrDesc[]
// 
// Purpose:
//   Description of UltraSparc machine instructions.
// 
//---------------------------------------------------------------------------

enum SparcMachineOpCode {
#define I(ENUM, OPCODESTRING, NUMOPERANDS, RESULTPOS, MAXIMM, IMMSE, \
          NUMDELAYSLOTS, LATENCY, SCHEDCLASS, INSTFLAGS)             \
   ENUM,
#include "SparcInstr.def"

  // End-of-array marker
  INVALID_OPCODE,
  NUM_REAL_OPCODES = PHI,		// number of valid opcodes
  NUM_TOTAL_OPCODES = INVALID_OPCODE
};


// Array of machine instruction descriptions...
extern const MachineInstrDescriptor SparcMachineInstrDesc[];


//---------------------------------------------------------------------------
// class UltraSparcInstrInfo 
// 
// Purpose:
//   Information about individual instructions.
//   Most information is stored in the SparcMachineInstrDesc array above.
//   Other information is computed on demand, and most such functions
//   default to member functions in base class MachineInstrInfo. 
//---------------------------------------------------------------------------

class UltraSparcInstrInfo : public MachineInstrInfo {
public:
  /*ctor*/	UltraSparcInstrInfo(const TargetMachine& tgt);

  //
  // All immediate constants are in position 1 except the
  // store instructions.
  // 
  virtual int getImmedConstantPos(MachineOpCode opCode) const {
    bool ignore;
    if (this->maxImmedConstant(opCode, ignore) != 0)
      {
        assert(! this->isStore((MachineOpCode) STB - 1)); // 1st  store opcode
        assert(! this->isStore((MachineOpCode) STXFSR+1));// last store opcode
        return (opCode >= STB && opCode <= STXFSR)? 2 : 1;
      }
    else
      return -1;
  }
  
  virtual bool		hasResultInterlock	(MachineOpCode opCode) const
  {
    // All UltraSPARC instructions have interlocks (note that delay slots
    // are not considered here).
    // However, instructions that use the result of an FCMP produce a
    // 9-cycle stall if they are issued less than 3 cycles after the FCMP.
    // Force the compiler to insert a software interlock (i.e., gap of
    // 2 other groups, including NOPs if necessary).
    return (opCode == FCMPS || opCode == FCMPD || opCode == FCMPQ);
  }

  //-------------------------------------------------------------------------
  // Code generation support for creating individual machine instructions
  //-------------------------------------------------------------------------
  
  // Create an instruction sequence to put the constant `val' into
  // the virtual register `dest'.  `val' may be a Constant or a
  // GlobalValue, viz., the constant address of a global variable or function.
  // The generated instructions are returned in `mvec'.
  // Any temp. registers (TmpInstruction) created are recorded in mcfi.
  // Any stack space required is allocated via mcff.
  // 
  virtual void  CreateCodeToLoadConst(const TargetMachine& target,
                                      Function* F,
                                      Value* val,
                                      Instruction* dest,
                                      std::vector<MachineInstr*>& mvec,
                                      MachineCodeForInstruction& mcfi) const;

  // Create an instruction sequence to copy an integer value `val'
  // to a floating point value `dest' by copying to memory and back.
  // val must be an integral type.  dest must be a Float or Double.
  // The generated instructions are returned in `mvec'.
  // Any temp. registers (TmpInstruction) created are recorded in mcfi.
  // Any stack space required is allocated via mcff.
  // 
  virtual void  CreateCodeToCopyIntToFloat(const TargetMachine& target,
                                       Function* F,
                                       Value* val,
                                       Instruction* dest,
                                       std::vector<MachineInstr*>& mvec,
                                       MachineCodeForInstruction& mcfi) const;

  // Similarly, create an instruction sequence to copy an FP value
  // `val' to an integer value `dest' by copying to memory and back.
  // The generated instructions are returned in `mvec'.
  // Any temp. registers (TmpInstruction) created are recorded in mcfi.
  // Any stack space required is allocated via mcff.
  // 
  virtual void  CreateCodeToCopyFloatToInt(const TargetMachine& target,
                                       Function* F,
                                       Value* val,
                                       Instruction* dest,
                                       std::vector<MachineInstr*>& mvec,
                                       MachineCodeForInstruction& mcfi) const;
  
  // Create instruction(s) to copy src to dest, for arbitrary types
  // The generated instructions are returned in `mvec'.
  // Any temp. registers (TmpInstruction) created are recorded in mcfi.
  // Any stack space required is allocated via mcff.
  // 
  virtual void CreateCopyInstructionsByType(const TargetMachine& target,
                                       Function* F,
                                       Value* src,
                                       Instruction* dest,
                                       std::vector<MachineInstr*>& mvec,
                                       MachineCodeForInstruction& mcfi) const;

  // Create instruction sequence to produce a sign-extended register value
  // from an arbitrary sized value (sized in bits, not bytes).
  // Any stack space required is allocated via mcff.
  // 
  virtual void CreateSignExtensionInstructions(const TargetMachine& target,
                                       Function* F,
                                       Value* unsignedSrcVal,
                                       unsigned int srcSizeInBits,
                                       Value* dest,
                                       std::vector<MachineInstr*>& mvec,
                                       MachineCodeForInstruction& mcfi) const;
};


//----------------------------------------------------------------------------
// class UltraSparcRegInfo
//
// This class implements the virtual class MachineRegInfo for Sparc.
//
//----------------------------------------------------------------------------

class UltraSparcRegInfo : public MachineRegInfo {
  // The actual register classes in the Sparc
  //
  enum RegClassIDs { 
    IntRegClassID,                      // Integer
    FloatRegClassID,                    // Float (both single/double)
    IntCCRegClassID,                    // Int Condition Code
    FloatCCRegClassID                   // Float Condition code
  };


  // Type of registers available in Sparc. There can be several reg types
  // in the same class. For instace, the float reg class has Single/Double
  // types
  //
  enum RegTypes {
    IntRegType,
    FPSingleRegType,
    FPDoubleRegType,
    IntCCRegType,
    FloatCCRegType
  };

  // **** WARNING: If the above enum order is changed, also modify 
  // getRegisterClassOfValue method below since it assumes this particular 
  // order for efficiency.


  // reverse pointer to get info about the ultra sparc machine
  //
  const UltraSparc *const UltraSparcInfo;

  // Number of registers used for passing int args (usually 6: %o0 - %o5)
  //
  unsigned const NumOfIntArgRegs;

  // Number of registers used for passing float args (usually 32: %f0 - %f31)
  //
  unsigned const NumOfFloatArgRegs;

  // An out of bound register number that can be used to initialize register
  // numbers. Useful for error detection.
  //
  int const InvalidRegNum;


  // ========================  Private Methods =============================

  // The following methods are used to color special live ranges (e.g.
  // function args and return values etc.) with specific hardware registers
  // as required. See SparcRegInfo.cpp for the implementation.
  //
  void suggestReg4RetAddr(MachineInstr *RetMI, 
			  LiveRangeInfo &LRI) const;

  void suggestReg4CallAddr(MachineInstr *CallMI, LiveRangeInfo &LRI,
			   std::vector<RegClass *> RCList) const;
  
  void InitializeOutgoingArg(MachineInstr* CallMI, AddedInstrns *CallAI,
                             PhyRegAlloc &PRA, LiveRange* LR,
                             unsigned regType, unsigned RegClassID,
                             int  UniArgReg, unsigned int argNo,
                             std::vector<MachineInstr *>& AddedInstrnsBefore)
    const;
  
  // The following 4 methods are used to find the RegType (see enum above)
  // for a reg class and a given primitive type, a LiveRange, a Value,
  // or a particular machine register.
  // The fifth function gives the reg class of the given RegType.
  // 
  int getRegType(unsigned regClassID, const Type* type) const;
  int getRegType(const LiveRange *LR) const;
  int getRegType(const Value *Val) const;
  int getRegType(int unifiedRegNum) const;

  // Used to generate a copy instruction based on the register class of
  // value.
  //
  MachineInstr *cpValue2RegMI(Value *Val,  unsigned DestReg,
                              int RegType) const;


  // The following 2 methods are used to order the instructions addeed by
  // the register allocator in association with function calling. See
  // SparcRegInfo.cpp for more details
  //
  void moveInst2OrdVec(std::vector<MachineInstr *> &OrdVec,
                       MachineInstr *UnordInst,
		       PhyRegAlloc &PRA) const;

  void OrderAddedInstrns(std::vector<MachineInstr *> &UnordVec, 
                         std::vector<MachineInstr *> &OrdVec,
                         PhyRegAlloc &PRA) const;


  // Compute which register can be used for an argument, if any
  // 
  int regNumForIntArg(bool inCallee, bool isVarArgsCall,
                      unsigned argNo, unsigned intArgNo, unsigned fpArgNo,
                      unsigned& regClassId) const;

  int regNumForFPArg(unsigned RegType, bool inCallee, bool isVarArgsCall,
                     unsigned argNo, unsigned intArgNo, unsigned fpArgNo,
                     unsigned& regClassId) const;
  
public:
  UltraSparcRegInfo(const UltraSparc &tgt);

  // To get complete machine information structure using the machine register
  // information
  //
  inline const UltraSparc &getUltraSparcInfo() const { 
    return *UltraSparcInfo;
  }

  // To find the register class used for a specified Type
  //
  unsigned getRegClassIDOfType(const Type *type,
                               bool isCCReg = false) const;

  // To find the register class of a Value
  //
  inline unsigned getRegClassIDOfValue(const Value *Val,
                                       bool isCCReg = false) const {
    return getRegClassIDOfType(Val->getType(), isCCReg);
  }

  // To find the register class to which a specified register belongs
  //
  unsigned getRegClassIDOfReg(int unifiedRegNum) const;
  unsigned getRegClassIDOfRegType(int regType) const;
  
  // getZeroRegNum - returns the register that contains always zero this is the
  // unified register number
  //
  virtual int getZeroRegNum() const;

  // getCallAddressReg - returns the reg used for pushing the address when a
  // function is called. This can be used for other purposes between calls
  //
  unsigned getCallAddressReg() const;

  // Returns the register containing the return address.
  // It should be made sure that this  register contains the return 
  // value when a return instruction is reached.
  //
  unsigned getReturnAddressReg() const;

  // Number of registers used for passing int args (usually 6: %o0 - %o5)
  // and float args (usually 32: %f0 - %f31)
  //
  unsigned const GetNumOfIntArgRegs() const   { return NumOfIntArgRegs; }
  unsigned const GetNumOfFloatArgRegs() const { return NumOfFloatArgRegs; }
  
  // The following methods are used to color special live ranges (e.g.
  // function args and return values etc.) with specific hardware registers
  // as required. See SparcRegInfo.cpp for the implementation for Sparc.
  //
  void suggestRegs4MethodArgs(const Function *Meth, 
			      LiveRangeInfo& LRI) const;

  void suggestRegs4CallArgs(MachineInstr *CallMI, 
			    LiveRangeInfo& LRI,
                            std::vector<RegClass *> RCL) const; 

  void suggestReg4RetValue(MachineInstr *RetMI, 
                           LiveRangeInfo& LRI) const;
  
  void colorMethodArgs(const Function *Meth,  LiveRangeInfo &LRI,
		       AddedInstrns *FirstAI) const;

  void colorCallArgs(MachineInstr *CallMI, LiveRangeInfo &LRI,
		     AddedInstrns *CallAI,  PhyRegAlloc &PRA,
		     const BasicBlock *BB) const;

  void colorRetValue(MachineInstr *RetI,   LiveRangeInfo& LRI,
		     AddedInstrns *RetAI) const;


  // method used for printing a register for debugging purposes
  //
  static void printReg(const LiveRange *LR);

  // Each register class has a seperate space for register IDs. To convert
  // a regId in a register class to a common Id, or vice versa,
  // we use the folloing methods.
  //
  // This method provides a unique number for each register 
  inline int getUnifiedRegNum(unsigned regClassID, int reg) const {
    
    if (regClassID == IntRegClassID) {
      assert(reg < 32 && "Invalid reg. number");
      return reg;
    }
    else if (regClassID == FloatRegClassID) {
      assert(reg < 64 && "Invalid reg. number");
      return reg + 32;                  // we have 32 int regs
    }
    else if (regClassID == FloatCCRegClassID) {
      assert(reg < 4 && "Invalid reg. number");
      return reg + 32 + 64;             // 32 int, 64 float
    }
    else if (regClassID == IntCCRegClassID ) {
      assert(reg == 0 && "Invalid reg. number");
      return reg + 4+ 32 + 64;          // only one int CC reg
    }
    else if (reg==InvalidRegNum) {
      return InvalidRegNum;
    }
    else  
      assert(0 && "Invalid register class");
    return 0;
  }
  
  // This method converts the unified number to the number in its class,
  // and returns the class ID in regClassID.
  inline int getClassRegNum(int ureg, unsigned& regClassID) const {
    if      (ureg < 32)     { regClassID = IntRegClassID;     return ureg;    }
    else if (ureg < 32+64)  { regClassID = FloatRegClassID;   return ureg-32; }
    else if (ureg < 4 +96)  { regClassID = FloatCCRegClassID; return ureg-96; }
    else if (ureg < 1 +100) { regClassID = IntCCRegClassID;   return ureg-100;}
    else if (ureg == InvalidRegNum) { return InvalidRegNum; }
    else { assert(0 && "Invalid unified register number"); }
  }
  
  // Returns the assembly-language name of the specified machine register.
  //
  virtual const std::string getUnifiedRegName(int reg) const;


  // returns the # of bytes of stack space allocated for each register
  // type. For Sparc, currently we allocate 8 bytes on stack for all 
  // register types. We can optimize this later if necessary to save stack
  // space (However, should make sure that stack alignment is correct)
  //
  inline int getSpilledRegSize(int RegType) const {
    return 8;
  }


  // To obtain the return value and the indirect call address (if any)
  // contained in a CALL machine instruction
  //
  const Value * getCallInstRetVal(const MachineInstr *CallMI) const;
  const Value * getCallInstIndirectAddrVal(const MachineInstr *CallMI) const;

  // The following methods are used to generate "copy" machine instructions
  // for an architecture.
  //
  // The function regTypeNeedsScratchReg() can be used to check whether a
  // scratch register is needed to copy a register of type `regType' to
  // or from memory.  If so, such a scratch register can be provided by
  // the caller (e.g., if it knows which regsiters are free); otherwise
  // an arbitrary one will be chosen and spilled by the copy instructions.
  //
  bool regTypeNeedsScratchReg(int RegType,
                              int& scratchRegClassId) const;

  void cpReg2RegMI(std::vector<MachineInstr*>& mvec,
                   unsigned SrcReg, unsigned DestReg,
                   int RegType) const;

  void cpReg2MemMI(std::vector<MachineInstr*>& mvec,
                   unsigned SrcReg, unsigned DestPtrReg,
                   int Offset, int RegType, int scratchReg = -1) const;

  void cpMem2RegMI(std::vector<MachineInstr*>& mvec,
                   unsigned SrcPtrReg, int Offset, unsigned DestReg,
                   int RegType, int scratchReg = -1) const;

  void cpValue2Value(Value *Src, Value *Dest,
                     std::vector<MachineInstr*>& mvec) const;

  // To see whether a register is a volatile (i.e., whehter it must be
  // preserved acorss calls)
  //
  inline bool isRegVolatile(int RegClassID, int Reg) const {
    return MachineRegClassArr[RegClassID]->isRegVolatile(Reg);
  }


  virtual unsigned getFramePointer() const;
  virtual unsigned getStackPointer() const;

  virtual int getInvalidRegNum() const {
    return InvalidRegNum;
  }

  // This method inserts the caller saving code for call instructions
  //
  void insertCallerSavingCode(MachineInstr *MInst, 
			      const BasicBlock *BB, PhyRegAlloc &PRA ) const;
};




//---------------------------------------------------------------------------
// class UltraSparcSchedInfo
// 
// Purpose:
//   Interface to instruction scheduling information for UltraSPARC.
//   The parameter values above are based on UltraSPARC IIi.
//---------------------------------------------------------------------------


class UltraSparcSchedInfo: public MachineSchedInfo {
public:
  UltraSparcSchedInfo(const TargetMachine &tgt);
protected:
  virtual void initializeResources();
};


//---------------------------------------------------------------------------
// class UltraSparcFrameInfo 
// 
// Purpose:
//   Interface to stack frame layout info for the UltraSPARC.
//   Starting offsets for each area of the stack frame are aligned at
//   a multiple of getStackFrameSizeAlignment().
//---------------------------------------------------------------------------

class UltraSparcFrameInfo: public MachineFrameInfo {
public:
  UltraSparcFrameInfo(const TargetMachine &tgt) : MachineFrameInfo(tgt) {}
  
public:
  int  getStackFrameSizeAlignment() const { return StackFrameSizeAlignment;}
  int  getMinStackFrameSize()       const { return MinStackFrameSize; }
  int  getNumFixedOutgoingArgs()    const { return NumFixedOutgoingArgs; }
  int  getSizeOfEachArgOnStack()    const { return SizeOfEachArgOnStack; }
  bool argsOnStackHaveFixedSize()   const { return true; }

  //
  // These methods compute offsets using the frame contents for a
  // particular function.  The frame contents are obtained from the
  // MachineCodeInfoForMethod object for the given function.
  // 
  int getFirstIncomingArgOffset  (MachineCodeForMethod& mcInfo,
                                  bool& growUp) const
  {
    growUp = true;                         // arguments area grows upwards
    return FirstIncomingArgOffsetFromFP;
  }
  int getFirstOutgoingArgOffset  (MachineCodeForMethod& mcInfo,
                                  bool& growUp) const
  {
    growUp = true;                         // arguments area grows upwards
    return FirstOutgoingArgOffsetFromSP;
  }
  int getFirstOptionalOutgoingArgOffset(MachineCodeForMethod& mcInfo,
                                        bool& growUp)const
  {
    growUp = true;                         // arguments area grows upwards
    return FirstOptionalOutgoingArgOffsetFromSP;
  }
  
  int getFirstAutomaticVarOffset (MachineCodeForMethod& mcInfo,
                                  bool& growUp) const;
  int getRegSpillAreaOffset      (MachineCodeForMethod& mcInfo,
                                  bool& growUp) const;
  int getTmpAreaOffset           (MachineCodeForMethod& mcInfo,
                                  bool& growUp) const;
  int getDynamicAreaOffset       (MachineCodeForMethod& mcInfo,
                                  bool& growUp) const;

  //
  // These methods specify the base register used for each stack area
  // (generally FP or SP)
  // 
  virtual int getIncomingArgBaseRegNum()               const {
    return (int) target.getRegInfo().getFramePointer();
  }
  virtual int getOutgoingArgBaseRegNum()               const {
    return (int) target.getRegInfo().getStackPointer();
  }
  virtual int getOptionalOutgoingArgBaseRegNum()       const {
    return (int) target.getRegInfo().getStackPointer();
  }
  virtual int getAutomaticVarBaseRegNum()              const {
    return (int) target.getRegInfo().getFramePointer();
  }
  virtual int getRegSpillAreaBaseRegNum()              const {
    return (int) target.getRegInfo().getFramePointer();
  }
  virtual int getDynamicAreaBaseRegNum()               const {
    return (int) target.getRegInfo().getStackPointer();
  }
  
private:
  // All stack addresses must be offset by 0x7ff (2047) on Sparc V9.
  static const int OFFSET                                  = (int) 0x7ff;
  static const int StackFrameSizeAlignment                 =  16;
  static const int MinStackFrameSize                       = 176;
  static const int NumFixedOutgoingArgs                    =   6;
  static const int SizeOfEachArgOnStack                    =   8;
  static const int StaticAreaOffsetFromFP                  =  0 + OFFSET;
  static const int FirstIncomingArgOffsetFromFP            = 128 + OFFSET;
  static const int FirstOptionalIncomingArgOffsetFromFP    = 176 + OFFSET;
  static const int FirstOutgoingArgOffsetFromSP            = 128 + OFFSET;
  static const int FirstOptionalOutgoingArgOffsetFromSP    = 176 + OFFSET;
};


//---------------------------------------------------------------------------
// class UltraSparcCacheInfo 
// 
// Purpose:
//   Interface to cache parameters for the UltraSPARC.
//   Just use defaults for now.
//---------------------------------------------------------------------------

class UltraSparcCacheInfo: public MachineCacheInfo {
public:
  UltraSparcCacheInfo(const TargetMachine &T) : MachineCacheInfo(T) {} 
};


//---------------------------------------------------------------------------
// class UltraSparcMachine 
// 
// Purpose:
//   Primary interface to machine description for the UltraSPARC.
//   Primarily just initializes machine-dependent parameters in
//   class TargetMachine, and creates machine-dependent subclasses
//   for classes such as InstrInfo, SchedInfo and RegInfo. 
//---------------------------------------------------------------------------

class UltraSparc : public TargetMachine {
private:
  UltraSparcInstrInfo instrInfo;
  UltraSparcSchedInfo schedInfo;
  UltraSparcRegInfo   regInfo;
  UltraSparcFrameInfo frameInfo;
  UltraSparcCacheInfo cacheInfo;
public:
  UltraSparc();
  
  virtual const MachineInstrInfo &getInstrInfo() const { return instrInfo; }
  virtual const MachineSchedInfo &getSchedInfo() const { return schedInfo; }
  virtual const MachineRegInfo   &getRegInfo()   const { return regInfo; }
  virtual const MachineFrameInfo &getFrameInfo() const { return frameInfo; }
  virtual const MachineCacheInfo &getCacheInfo() const { return cacheInfo; }

  //
  // addPassesToEmitAssembly - Add passes to the specified pass manager to get
  // assembly langage code emited.  For sparc, we have to do ...
  //
  virtual void addPassesToEmitAssembly(PassManager &PM, std::ostream &Out);

private:
  Pass *getFunctionAsmPrinterPass(PassManager &PM, std::ostream &Out);
  Pass *getModuleAsmPrinterPass(PassManager &PM, std::ostream &Out);
  Pass *getEmitBytecodeToAsmPass(std::ostream &Out);
};

#endif