LLVM API Documentation

PPCRegisterInfo.h

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00001 //===- PPCRegisterInfo.h - PowerPC Register Information Impl -----*- C++ -*-==//
00002 //
00003 //                     The LLVM Compiler Infrastructure
00004 //
00005 // This file was developed by the LLVM research group and is distributed under
00006 // the University of Illinois Open Source License. See LICENSE.TXT for details.
00007 //
00008 //===----------------------------------------------------------------------===//
00009 //
00010 // This file contains the PowerPC implementation of the MRegisterInfo class.
00011 //
00012 //===----------------------------------------------------------------------===//
00013 
00014 #ifndef POWERPC32_REGISTERINFO_H
00015 #define POWERPC32_REGISTERINFO_H
00016 
00017 #include "PPC.h"
00018 #include "PPCGenRegisterInfo.h.inc"
00019 #include <map>
00020 
00021 namespace llvm {
00022 class PPCSubtarget;
00023 class Type;
00024 
00025 class PPCRegisterInfo : public PPCGenRegisterInfo {
00026   std::map<unsigned, unsigned> ImmToIdxMap;
00027   const PPCSubtarget &Subtarget;
00028 public:
00029   PPCRegisterInfo(const PPCSubtarget &SubTarget);
00030   
00031   /// getRegisterNumbering - Given the enum value for some register, e.g.
00032   /// PPC::F14, return the number that it corresponds to (e.g. 14).
00033   static unsigned getRegisterNumbering(unsigned RegEnum);
00034 
00035   /// Code Generation virtual methods...
00036   void storeRegToStackSlot(MachineBasicBlock &MBB,
00037                            MachineBasicBlock::iterator MBBI,
00038                            unsigned SrcReg, int FrameIndex,
00039                            const TargetRegisterClass *RC) const;
00040 
00041   void loadRegFromStackSlot(MachineBasicBlock &MBB,
00042                             MachineBasicBlock::iterator MBBI,
00043                             unsigned DestReg, int FrameIndex,
00044                             const TargetRegisterClass *RC) const;
00045 
00046   void copyRegToReg(MachineBasicBlock &MBB, MachineBasicBlock::iterator MBBI,
00047                     unsigned DestReg, unsigned SrcReg,
00048                     const TargetRegisterClass *RC) const;
00049 
00050   /// foldMemoryOperand - PowerPC (like most RISC's) can only fold spills into
00051   /// copy instructions, turning them into load/store instructions.
00052   virtual MachineInstr* foldMemoryOperand(MachineInstr* MI, unsigned OpNum,
00053                                           int FrameIndex) const;
00054   
00055   const unsigned *getCalleeSaveRegs() const;
00056 
00057   const TargetRegisterClass* const* getCalleeSaveRegClasses() const;
00058 
00059   void eliminateCallFramePseudoInstr(MachineFunction &MF,
00060                                      MachineBasicBlock &MBB,
00061                                      MachineBasicBlock::iterator I) const;
00062 
00063   void eliminateFrameIndex(MachineBasicBlock::iterator II) const;
00064 
00065   void emitPrologue(MachineFunction &MF) const;
00066   void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const;
00067 
00068   // Debug information queries.
00069   unsigned getRARegister() const;
00070   unsigned getFrameRegister(MachineFunction &MF) const;
00071   void getInitialFrameState(std::vector<MachineMove *> &Moves) const;
00072 };
00073 
00074 } // end namespace llvm
00075 
00076 #endif