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/Target/TargetRegisterInfo.h"
18 #include "X86GenRegisterInfo.h.inc"
22 class TargetInstrInfo;
23 class X86TargetMachine;
25 /// N86 namespace - Native X86 register numbers
29 EAX = 0, ECX = 1, EDX = 2, EBX = 3, ESP = 4, EBP = 5, ESI = 6, EDI = 7
34 /// SubregIndex - The index of various sized subregister classes. Note that
35 /// these indices must be kept in sync with the class indices in the
36 /// X86RegisterInfo.td file.
38 SUBREG_8BIT = 1, SUBREG_16BIT = 2, SUBREG_32BIT = 3
42 /// DWARFFlavour - Flavour of dwarf regnumbers
44 namespace DWARFFlavour {
46 X86_64 = 0, X86_32_DarwinEH = 1, X86_32_Generic = 2
50 class X86RegisterInfo : public X86GenRegisterInfo {
53 const TargetInstrInfo &TII;
56 /// Is64Bit - Is the target 64-bits.
60 /// IsWin64 - Is the target on of win64 flavours
64 /// SlotSize - Stack slot size in bytes.
68 /// StackAlign - Default stack alignment.
72 /// StackPtr - X86 physical register used as stack ptr.
76 /// FramePtr - X86 physical register used as frame ptr.
81 X86RegisterInfo(X86TargetMachine &tm, const TargetInstrInfo &tii);
83 /// getX86RegNum - Returns the native X86 register number for the given LLVM
84 /// register identifier.
85 static unsigned getX86RegNum(unsigned RegNo);
87 unsigned getStackAlignment() const { return StackAlign; }
89 /// getDwarfRegNum - allows modification of X86GenRegisterInfo::getDwarfRegNum
90 /// (created by TableGen) for target dependencies.
91 int getDwarfRegNum(unsigned RegNum, bool isEH) const;
93 /// Code Generation virtual methods...
96 /// getCrossCopyRegClass - Returns a legal register class to copy a register
97 /// in the specified class to or from. Returns NULL if it is possible to copy
98 /// between a two registers of the specified class.
99 const TargetRegisterClass *
100 getCrossCopyRegClass(const TargetRegisterClass *RC) const;
102 /// getCalleeSavedRegs - Return a null-terminated list of all of the
103 /// callee-save registers on this target.
104 const unsigned *getCalleeSavedRegs(const MachineFunction* MF = 0) const;
106 /// getCalleeSavedRegClasses - Return a null-terminated list of the preferred
107 /// register classes to spill each callee-saved register with. The order and
108 /// length of this list match the getCalleeSavedRegs() list.
109 const TargetRegisterClass* const*
110 getCalleeSavedRegClasses(const MachineFunction *MF = 0) const;
112 /// getReservedRegs - Returns a bitset indexed by physical register number
113 /// indicating if a register is a special register that has particular uses and
114 /// should be considered unavailable at all times, e.g. SP, RA. This is used by
115 /// register scavenger to determine what registers are free.
116 BitVector getReservedRegs(const MachineFunction &MF) const;
118 bool hasFP(const MachineFunction &MF) const;
120 bool needsStackRealignment(const MachineFunction &MF) const;
122 bool hasReservedCallFrame(MachineFunction &MF) const;
124 void eliminateCallFramePseudoInstr(MachineFunction &MF,
125 MachineBasicBlock &MBB,
126 MachineBasicBlock::iterator MI) const;
128 void eliminateFrameIndex(MachineBasicBlock::iterator MI,
129 int SPAdj, RegScavenger *RS = NULL) const;
131 void processFunctionBeforeFrameFinalized(MachineFunction &MF) const;
132 void processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
133 RegScavenger *RS = NULL) const;
135 void emitPrologue(MachineFunction &MF) const;
136 void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const;
138 void emitFrameMoves(MachineFunction &MF,
139 unsigned FrameLabelId, unsigned ReadyLabelId) const;
141 // Debug information queries.
142 unsigned getRARegister() const;
143 unsigned getFrameRegister(MachineFunction &MF) const;
144 int getFrameIndexOffset(MachineFunction &MF, int FI) const;
145 void getInitialFrameState(std::vector<MachineMove> &Moves) const;
147 // Exception handling queries.
148 unsigned getEHExceptionRegister() const;
149 unsigned getEHHandlerRegister() const;
152 // getX86SubSuperRegister - X86 utility function. It returns the sub or super
153 // register of a specific X86 register.
154 // e.g. getX86SubSuperRegister(X86::EAX, MVT::i16) return X86:AX
155 unsigned getX86SubSuperRegister(unsigned, MVT, bool High=false);
157 } // End llvm namespace