lib/Target/ARM/Thumb1InstrInfo.h

   1 //===- Thumb1InstrInfo.h - Thumb-1 Instruction Information ----------*- C++ -*-===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // This file contains the Thumb-1 implementation of the TargetInstrInfo class.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #ifndef THUMB1INSTRUCTIONINFO_H
  15 #define THUMB1INSTRUCTIONINFO_H
  16
  17 #include "llvm/Target/TargetInstrInfo.h"
  18 #include "ARM.h"
  19 #include "ARMInstrInfo.h"
  20 #include "Thumb1RegisterInfo.h"
  21
  22 namespace llvm {
  23   class ARMSubtarget;
  24
  25 class Thumb1InstrInfo : public ARMBaseInstrInfo {
  26   Thumb1RegisterInfo RI;
  27 public:
  28   explicit Thumb1InstrInfo(const ARMSubtarget &STI);
  29
  30   // Return the non-pre/post incrementing version of 'Opc'. Return 0
  31   // if there is not such an opcode.
  32   unsigned getUnindexedOpcode(unsigned Opc) const;
  33
  34   // Return the opcode that implements 'Op', or 0 if no opcode
  35   unsigned getOpcode(ARMII::Op Op) const;
  36
  37   // Return true if the block does not fall through.
  38   bool BlockHasNoFallThrough(const MachineBasicBlock &MBB) const;
  39
  40   /// getRegisterInfo - TargetInstrInfo is a superset of MRegister info.  As
  41   /// such, whenever a client has an instance of instruction info, it should
  42   /// always be able to get register info as well (through this method).
  43   ///
  44   const Thumb1RegisterInfo &getRegisterInfo() const { return RI; }
  45
  46   bool spillCalleeSavedRegisters(MachineBasicBlock &MBB,
  47                                  MachineBasicBlock::iterator MI,
  48                                  const std::vector<CalleeSavedInfo> &CSI) const;
  49   bool restoreCalleeSavedRegisters(MachineBasicBlock &MBB,
  50                                    MachineBasicBlock::iterator MI,
  51                                    const std::vector<CalleeSavedInfo> &CSI) const;
  52
  53   bool isMoveInstr(const MachineInstr &MI,
  54                            unsigned &SrcReg, unsigned &DstReg,
  55                            unsigned &SrcSubIdx, unsigned &DstSubIdx) const;
  56   unsigned isLoadFromStackSlot(const MachineInstr *MI,
  57                                        int &FrameIndex) const;
  58   unsigned isStoreToStackSlot(const MachineInstr *MI,
  59                                       int &FrameIndex) const;
  60
  61   bool copyRegToReg(MachineBasicBlock &MBB,
  62                             MachineBasicBlock::iterator I,
  63                             unsigned DestReg, unsigned SrcReg,
  64                             const TargetRegisterClass *DestRC,
  65                             const TargetRegisterClass *SrcRC) const;
  66   void storeRegToStackSlot(MachineBasicBlock &MBB,
  67                                    MachineBasicBlock::iterator MBBI,
  68                                    unsigned SrcReg, bool isKill, int FrameIndex,
  69                                    const TargetRegisterClass *RC) const;
  70
  71   void loadRegFromStackSlot(MachineBasicBlock &MBB,
  72                                     MachineBasicBlock::iterator MBBI,
  73                                     unsigned DestReg, int FrameIndex,
  74                                     const TargetRegisterClass *RC) const;
  75
  76   bool canFoldMemoryOperand(const MachineInstr *MI,
  77                                     const SmallVectorImpl<unsigned> &Ops) const;
  78
  79   MachineInstr* foldMemoryOperandImpl(MachineFunction &MF,
  80                                       MachineInstr* MI,
  81                                       const SmallVectorImpl<unsigned> &Ops,
  82                                       int FrameIndex) const;
  83
  84   MachineInstr* foldMemoryOperandImpl(MachineFunction &MF,
  85                                       MachineInstr* MI,
  86                                       const SmallVectorImpl<unsigned> &Ops,
  87                                       MachineInstr* LoadMI) const {
  88     return 0;
  89   }
  90 };
  91 }
  92
  93 #endif // THUMB1INSTRUCTIONINFO_H