lib/Target/PowerPC/PPCRegisterInfo.h

   1 //===- PPCRegisterInfo.h - PowerPC Register Information Impl -----*- C++ -*-==//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file was developed by the LLVM research group and is distributed under
   6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // This file contains the PowerPC implementation of the MRegisterInfo class.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #ifndef POWERPC32_REGISTERINFO_H
  15 #define POWERPC32_REGISTERINFO_H
  16
  17 #include "PPC.h"
  18 #include "PPCGenRegisterInfo.h.inc"
  19 #include <map>
  20
  21 namespace llvm {
  22 class PPCSubtarget;
  23 class TargetInstrInfo;
  24 class Type;
  25
  26 class PPCRegisterInfo : public PPCGenRegisterInfo {
  27   std::map<unsigned, unsigned> ImmToIdxMap;
  28   const PPCSubtarget &Subtarget;
  29   const TargetInstrInfo &TII;
  30 public:
  31   PPCRegisterInfo(const PPCSubtarget &SubTarget, const TargetInstrInfo &tii);
  32
  33   /// getRegisterNumbering - Given the enum value for some register, e.g.
  34   /// PPC::F14, return the number that it corresponds to (e.g. 14).
  35   static unsigned getRegisterNumbering(unsigned RegEnum);
  36
  37   /// Code Generation virtual methods...
  38   void storeRegToStackSlot(MachineBasicBlock &MBB,
  39                            MachineBasicBlock::iterator MBBI,
  40                            unsigned SrcReg, int FrameIndex,
  41                            const TargetRegisterClass *RC) const;
  42
  43   void loadRegFromStackSlot(MachineBasicBlock &MBB,
  44                             MachineBasicBlock::iterator MBBI,
  45                             unsigned DestReg, int FrameIndex,
  46                             const TargetRegisterClass *RC) const;
  47
  48   void copyRegToReg(MachineBasicBlock &MBB, MachineBasicBlock::iterator MBBI,
  49                     unsigned DestReg, unsigned SrcReg,
  50                     const TargetRegisterClass *DestRC,
  51                     const TargetRegisterClass *SrcRC) const;
  52
  53   void reMaterialize(MachineBasicBlock &MBB, MachineBasicBlock::iterator MI,
  54                      unsigned DestReg, const MachineInstr *Orig) const;
  55
  56   /// foldMemoryOperand - PowerPC (like most RISC's) can only fold spills into
  57   /// copy instructions, turning them into load/store instructions.
  58   virtual MachineInstr* foldMemoryOperand(MachineInstr* MI, unsigned OpNum,
  59                                           int FrameIndex) const;
  60
  61   virtual MachineInstr* foldMemoryOperand(MachineInstr* MI, unsigned OpNum,
  62                                           MachineInstr* LoadMI) const {
  63     return 0;
  64   }
  65
  66   const unsigned *getCalleeSavedRegs(const MachineFunction* MF = 0) const;
  67
  68   const TargetRegisterClass* const*
  69   getCalleeSavedRegClasses(const MachineFunction *MF = 0) const;
  70
  71   BitVector getReservedRegs(const MachineFunction &MF) const;
  72
  73   /// targetHandlesStackFrameRounding - Returns true if the target is
  74   /// responsible for rounding up the stack frame (probably at emitPrologue
  75   /// time).
  76   bool targetHandlesStackFrameRounding() const { return true; }
  77
  78   bool hasFP(const MachineFunction &MF) const;
  79
  80   void eliminateCallFramePseudoInstr(MachineFunction &MF,
  81                                      MachineBasicBlock &MBB,
  82                                      MachineBasicBlock::iterator I) const;
  83
  84   /// usesLR - Returns if the link registers (LR) has been used in the function.
  85   ///
  86   bool usesLR(MachineFunction &MF) const;
  87
  88   void lowerDynamicAlloc(MachineBasicBlock::iterator II) const;
  89   void eliminateFrameIndex(MachineBasicBlock::iterator II,
  90                            int SPAdj, RegScavenger *RS = NULL) const;
  91
  92   /// determineFrameLayout - Determine the size of the frame and maximum call
  93   /// frame size.
  94   void determineFrameLayout(MachineFunction &MF) const;
  95
  96   void processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
  97                                             RegScavenger *RS = NULL) const;
  98   void emitPrologue(MachineFunction &MF) const;
  99   void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const;
 100
 101   // Debug information queries.
 102   unsigned getRARegister() const;
 103   unsigned getFrameRegister(MachineFunction &MF) const;
 104   void getInitialFrameState(std::vector<MachineMove> &Moves) const;
 105
 106   // Exception handling queries.
 107   unsigned getEHExceptionRegister() const;
 108   unsigned getEHHandlerRegister() const;
 109 };
 110
 111 } // end namespace llvm
 112
 113 #endif