llvm.org GIT mirror llvm / release_28 lib / Target / CellSPU / SPURegisterInfo.h

Tree @release_28 (Download .tar.gz)

SPURegisterInfo.h @release_28raw · history · blame

//===- SPURegisterInfo.h - Cell SPU 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 Cell SPU implementation of the TargetRegisterInfo
// class.


#include "SPU.h"
#include "SPUGenRegisterInfo.h.inc"

namespace llvm {
  class SPUSubtarget;
  class TargetInstrInfo;
  class Type;

  class SPURegisterInfo : public SPUGenRegisterInfo {
    const SPUSubtarget &Subtarget;
    const TargetInstrInfo &TII;

    //! Predicate: Does the machine function use the link register?
    bool usesLR(MachineFunction &MF) const;

    SPURegisterInfo(const SPUSubtarget &subtarget, const TargetInstrInfo &tii);
    //! Translate a register's enum value to a register number
      This method translates a register's enum value to it's regiser number,
      e.g. SPU::R14 -> 14.
    static unsigned getRegisterNumbering(unsigned RegEnum);

    /// getPointerRegClass - Return the register class to use to hold pointers.
    /// This is used for addressing modes.
    virtual const TargetRegisterClass *
    getPointerRegClass(unsigned Kind = 0) const;

    //! Return the array of callee-saved registers
    virtual const unsigned* getCalleeSavedRegs(const MachineFunction *MF) const;

    //! Allow for scavenging, so we can get scratch registers when needed.
    virtual bool requiresRegisterScavenging(const MachineFunction &MF) const
    { return true; }

    //! Return the reserved registers
    BitVector getReservedRegs(const MachineFunction &MF) const;

    //! Prediate: Target has dedicated frame pointer
    bool hasFP(const MachineFunction &MF) const;
    //! Eliminate the call frame setup pseudo-instructions
    void eliminateCallFramePseudoInstr(MachineFunction &MF,
                                       MachineBasicBlock &MBB,
                                       MachineBasicBlock::iterator I) const;
    //! Convert frame indicies into machine operands
    void eliminateFrameIndex(MachineBasicBlock::iterator II, int SPAdj,
                             RegScavenger *RS = NULL) const;
    //! Determine the frame's layour
    void determineFrameLayout(MachineFunction &MF) const;

    void processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
                                              RegScavenger *RS = NULL) const;
    //! Emit the function prologue
    void emitPrologue(MachineFunction &MF) const;
    //! Emit the function epilogue
    void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const;
    //! Get return address register (LR, aka R0)
    unsigned getRARegister() const;
    //! Get the stack frame register (SP, aka R1)
    unsigned getFrameRegister(const MachineFunction &MF) const;
    //! Perform target-specific stack frame setup.
    void getInitialFrameState(std::vector<MachineMove> &Moves) const;

    // New methods added:

    //! Get DWARF debugging register number
    int getDwarfRegNum(unsigned RegNum, bool isEH) const;

    //! Convert D-form load/store to X-form load/store
      Converts a regiser displacement load/store into a register-indexed
      load/store for large stack frames, when the stack frame exceeds the
      range of a s10 displacement.
    int convertDFormToXForm(int dFormOpcode) const;

    //! Acquire an unused register in an emergency.
    unsigned findScratchRegister(MachineBasicBlock::iterator II,
                                 RegScavenger *RS,
                                 const TargetRegisterClass *RC, 
                                 int SPAdj) const;
} // end namespace llvm