1 //===- X86RegisterInfo.h - X86 Register Information Impl --------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
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.
8 //===----------------------------------------------------------------------===//
10 // This file contains the X86 implementation of the MRegisterInfo class.
12 //===----------------------------------------------------------------------===//
14 #ifndef X86REGISTERINFO_H
15 #define X86REGISTERINFO_H
17 #include "llvm/Target/MRegisterInfo.h"
18 #include "X86GenRegisterInfo.h.inc"
22 class TargetInstrInfo;
23 class X86TargetMachine;
25 class X86RegisterInfo : public X86GenRegisterInfo {
28 const TargetInstrInfo &TII;
31 /// Is64Bit - Is the target 64-bits.
34 /// SlotSize - Stack slot size in bytes.
37 /// StackPtr - X86 physical register used as stack ptr.
40 /// FramePtr - X86 physical register used as frame ptr.
44 X86RegisterInfo(X86TargetMachine &tm, const TargetInstrInfo &tii);
46 /// Code Generation virtual methods...
47 bool spillCalleeSavedRegisters(MachineBasicBlock &MBB,
48 MachineBasicBlock::iterator MI,
49 const std::vector<CalleeSavedInfo> &CSI) const;
51 bool restoreCalleeSavedRegisters(MachineBasicBlock &MBB,
52 MachineBasicBlock::iterator MI,
53 const std::vector<CalleeSavedInfo> &CSI) const;
55 void storeRegToStackSlot(MachineBasicBlock &MBB,
56 MachineBasicBlock::iterator MI,
57 unsigned SrcReg, int FrameIndex,
58 const TargetRegisterClass *RC) const;
60 void loadRegFromStackSlot(MachineBasicBlock &MBB,
61 MachineBasicBlock::iterator MI,
62 unsigned DestReg, int FrameIndex,
63 const TargetRegisterClass *RC) const;
65 void copyRegToReg(MachineBasicBlock &MBB,
66 MachineBasicBlock::iterator MI,
67 unsigned DestReg, unsigned SrcReg,
68 const TargetRegisterClass *RC) const;
70 void reMaterialize(MachineBasicBlock &MBB, MachineBasicBlock::iterator MI,
71 unsigned DestReg, const MachineInstr *Orig) const;
73 /// foldMemoryOperand - If this target supports it, fold a load or store of
74 /// the specified stack slot into the specified machine instruction for the
75 /// specified operand. If this is possible, the target should perform the
76 /// folding and return true, otherwise it should return false. If it folds
77 /// the instruction, it is likely that the MachineInstruction the iterator
78 /// references has been changed.
79 MachineInstr* foldMemoryOperand(MachineInstr* MI,
81 int FrameIndex) const;
83 /// getCalleeSavedRegs - Return a null-terminated list of all of the
84 /// callee-save registers on this target.
85 const unsigned *getCalleeSavedRegs(const MachineFunction* MF = 0) const;
87 /// getCalleeSavedRegClasses - Return a null-terminated list of the preferred
88 /// register classes to spill each callee-saved register with. The order and
89 /// length of this list match the getCalleeSavedRegs() list.
90 const TargetRegisterClass* const*
91 getCalleeSavedRegClasses(const MachineFunction *MF = 0) const;
93 /// getReservedRegs - Returns a bitset indexed by physical register number
94 /// indicating if a register is a special register that has particular uses and
95 /// should be considered unavailable at all times, e.g. SP, RA. This is used by
96 /// register scavenger to determine what registers are free.
97 BitVector getReservedRegs(const MachineFunction &MF) const;
99 bool hasFP(const MachineFunction &MF) const;
101 bool hasReservedCallFrame(MachineFunction &MF) const;
103 void eliminateCallFramePseudoInstr(MachineFunction &MF,
104 MachineBasicBlock &MBB,
105 MachineBasicBlock::iterator MI) const;
107 void eliminateFrameIndex(MachineBasicBlock::iterator MI,
108 int SPAdj, RegScavenger *RS = NULL) const;
110 void processFunctionBeforeFrameFinalized(MachineFunction &MF) const;
112 void emitPrologue(MachineFunction &MF) const;
113 void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const;
115 // Debug information queries.
116 unsigned getRARegister() const;
117 unsigned getFrameRegister(MachineFunction &MF) const;
118 void getInitialFrameState(std::vector<MachineMove> &Moves) const;
120 // Exception handling queries.
121 unsigned getEHExceptionRegister() const;
122 unsigned getEHHandlerRegister() const;
125 // getX86SubSuperRegister - X86 utility function. It returns the sub or super
126 // register of a specific X86 register.
127 // e.g. getX86SubSuperRegister(X86::EAX, MVT::i16) return X86:AX
128 unsigned getX86SubSuperRegister(unsigned, MVT::ValueType, bool High=false);
130 } // End llvm namespace