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 TargetRegisterInfo 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/TargetRegisterInfo.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
36 /// SubregIndex - The index of various sized subregister classes. Note that
37 /// these indices must be kept in sync with the class indices in the
38 /// X86RegisterInfo.td file.
40 SUBREG_8BIT = 1, SUBREG_16BIT = 2, SUBREG_32BIT = 3
44 /// DWARFFlavour - Flavour of dwarf regnumbers
46 namespace DWARFFlavour {
48 X86_64 = 0, X86_32_DarwinEH = 1, X86_32_Generic = 2
52 class X86RegisterInfo : public X86GenRegisterInfo {
55 const TargetInstrInfo &TII;
58 /// Is64Bit - Is the target 64-bits.
62 /// SlotSize - Stack slot size in bytes.
66 /// StackAlign - Default stack alignment.
70 /// StackPtr - X86 physical register used as stack ptr.
74 /// FramePtr - X86 physical register used as frame ptr.
79 X86RegisterInfo(X86TargetMachine &tm, const TargetInstrInfo &tii);
81 /// getX86RegNum - Returns the native X86 register number for the given LLVM
82 /// register identifier.
83 unsigned getX86RegNum(unsigned RegNo) const;
85 unsigned getStackAlignment() const { return StackAlign; }
87 /// getDwarfRegNum - allows modification of X86GenRegisterInfo::getDwarfRegNum
88 /// (created by TableGen) for target dependencies.
89 int getDwarfRegNum(unsigned RegNum, bool isEH) const;
91 /// Code Generation virtual methods...
93 const TargetRegisterClass *
94 getCrossCopyRegClass(const TargetRegisterClass *RC) const;
96 void reMaterialize(MachineBasicBlock &MBB, MachineBasicBlock::iterator MI,
97 unsigned DestReg, const MachineInstr *Orig) const;
99 /// getCalleeSavedRegs - Return a null-terminated list of all of the
100 /// callee-save registers on this target.
101 const unsigned *getCalleeSavedRegs(const MachineFunction* MF = 0) const;
103 /// getCalleeSavedRegClasses - Return a null-terminated list of the preferred
104 /// register classes to spill each callee-saved register with. The order and
105 /// length of this list match the getCalleeSavedRegs() list.
106 const TargetRegisterClass* const*
107 getCalleeSavedRegClasses(const MachineFunction *MF = 0) const;
109 /// getReservedRegs - Returns a bitset indexed by physical register number
110 /// indicating if a register is a special register that has particular uses and
111 /// should be considered unavailable at all times, e.g. SP, RA. This is used by
112 /// register scavenger to determine what registers are free.
113 BitVector getReservedRegs(const MachineFunction &MF) const;
115 bool hasFP(const MachineFunction &MF) const;
117 bool hasReservedCallFrame(MachineFunction &MF) const;
119 void eliminateCallFramePseudoInstr(MachineFunction &MF,
120 MachineBasicBlock &MBB,
121 MachineBasicBlock::iterator MI) const;
123 void eliminateFrameIndex(MachineBasicBlock::iterator MI,
124 int SPAdj, RegScavenger *RS = NULL) const;
126 void processFunctionBeforeFrameFinalized(MachineFunction &MF) const;
128 void emitPrologue(MachineFunction &MF) const;
129 void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const;
131 // Debug information queries.
132 unsigned getRARegister() const;
133 unsigned getFrameRegister(MachineFunction &MF) const;
134 int getFrameIndexOffset(MachineFunction &MF, int FI) const;
135 void getInitialFrameState(std::vector<MachineMove> &Moves) const;
137 // Exception handling queries.
138 unsigned getEHExceptionRegister() const;
139 unsigned getEHHandlerRegister() const;
142 // getX86SubSuperRegister - X86 utility function. It returns the sub or super
143 // register of a specific X86 register.
144 // e.g. getX86SubSuperRegister(X86::EAX, MVT::i16) return X86:AX
145 unsigned getX86SubSuperRegister(unsigned, MVT::ValueType, bool High=false);
147 } // End llvm namespace