1 //===- X86RegisterInfo.h - X86 Register Information Impl --------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // 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/ADT/DenseMap.h"
18 #include "llvm/ADT/SmallVector.h"
19 #include "llvm/Target/MRegisterInfo.h"
20 #include "X86GenRegisterInfo.h.inc"
24 class TargetInstrInfo;
25 class X86TargetMachine;
27 /// N86 namespace - Native X86 register numbers
31 EAX = 0, ECX = 1, EDX = 2, EBX = 3, ESP = 4, EBP = 5, ESI = 6, EDI = 7
35 /// DWARFFlavour - Flavour of dwarf regnumbers
37 namespace DWARFFlavour {
39 X86_64 = 0, X86_32_DarwinEH = 1, X86_32_Generic = 2
43 class X86RegisterInfo : public X86GenRegisterInfo {
46 const TargetInstrInfo &TII;
49 /// Is64Bit - Is the target 64-bits.
53 /// SlotSize - Stack slot size in bytes.
57 /// StackAlign - Default stack alignment.
61 /// StackPtr - X86 physical register used as stack ptr.
65 /// FramePtr - X86 physical register used as frame ptr.
70 X86RegisterInfo(X86TargetMachine &tm, const TargetInstrInfo &tii);
72 /// getX86RegNum - Returns the native X86 register number for the given LLVM
73 /// register identifier.
74 unsigned getX86RegNum(unsigned RegNo);
76 unsigned getStackAlignment() const { return StackAlign; }
78 /// getDwarfRegNum - allows modification of X86GenRegisterInfo::getDwarfRegNum
79 /// (created by TableGen) for target dependencies.
80 int getDwarfRegNum(unsigned RegNum, bool isEH) const;
82 /// Code Generation virtual methods...
84 const TargetRegisterClass *
85 getCrossCopyRegClass(const TargetRegisterClass *RC) const;
87 void reMaterialize(MachineBasicBlock &MBB, MachineBasicBlock::iterator MI,
88 unsigned DestReg, const MachineInstr *Orig) const;
90 /// getCalleeSavedRegs - Return a null-terminated list of all of the
91 /// callee-save registers on this target.
92 const unsigned *getCalleeSavedRegs(const MachineFunction* MF = 0) const;
94 /// getCalleeSavedRegClasses - Return a null-terminated list of the preferred
95 /// register classes to spill each callee-saved register with. The order and
96 /// length of this list match the getCalleeSavedRegs() list.
97 const TargetRegisterClass* const*
98 getCalleeSavedRegClasses(const MachineFunction *MF = 0) const;
100 /// getReservedRegs - Returns a bitset indexed by physical register number
101 /// indicating if a register is a special register that has particular uses and
102 /// should be considered unavailable at all times, e.g. SP, RA. This is used by
103 /// register scavenger to determine what registers are free.
104 BitVector getReservedRegs(const MachineFunction &MF) const;
106 bool hasFP(const MachineFunction &MF) const;
108 bool hasReservedCallFrame(MachineFunction &MF) const;
110 void eliminateCallFramePseudoInstr(MachineFunction &MF,
111 MachineBasicBlock &MBB,
112 MachineBasicBlock::iterator MI) const;
114 void eliminateFrameIndex(MachineBasicBlock::iterator MI,
115 int SPAdj, RegScavenger *RS = NULL) const;
117 void processFunctionBeforeFrameFinalized(MachineFunction &MF) const;
119 void emitPrologue(MachineFunction &MF) const;
120 void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const;
122 // Debug information queries.
123 unsigned getRARegister() const;
124 unsigned getFrameRegister(MachineFunction &MF) const;
125 int getFrameIndexOffset(MachineFunction &MF, unsigned FI) const;
126 void getInitialFrameState(std::vector<MachineMove> &Moves) const;
128 // Exception handling queries.
129 unsigned getEHExceptionRegister() const;
130 unsigned getEHHandlerRegister() const;
133 // getX86SubSuperRegister - X86 utility function. It returns the sub or super
134 // register of a specific X86 register.
135 // e.g. getX86SubSuperRegister(X86::EAX, MVT::i16) return X86:AX
136 unsigned getX86SubSuperRegister(unsigned, MVT::ValueType, bool High=false);
138 } // End llvm namespace