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"
19 #define GET_REGINFO_HEADER
20 #include "X86GenRegisterInfo.inc"
24 class TargetInstrInfo;
25 class X86TargetMachine;
27 class X86RegisterInfo : public X86GenRegisterInfo {
30 const TargetInstrInfo &TII;
33 /// Is64Bit - Is the target 64-bits.
37 /// IsWin64 - Is the target on of win64 flavours
41 /// SlotSize - Stack slot size in bytes.
45 /// StackPtr - X86 physical register used as stack ptr.
49 /// FramePtr - X86 physical register used as frame ptr.
53 /// BasePtr - X86 physical register used as a base ptr in complex stack
54 /// frames. I.e., when we need a 3rd base, not just SP and FP, due to
55 /// variable size stack objects.
59 X86RegisterInfo(X86TargetMachine &tm, const TargetInstrInfo &tii);
61 /// getX86RegNum - Returns the native X86 register number for the given LLVM
62 /// register identifier.
63 static unsigned getX86RegNum(unsigned RegNo);
65 // FIXME: This should be tablegen'd like getDwarfRegNum is
66 int getSEHRegNum(unsigned i) const;
68 /// getCompactUnwindRegNum - This function maps the register to the number for
69 /// compact unwind encoding. Return -1 if the register isn't valid.
70 int getCompactUnwindRegNum(unsigned RegNum, bool isEH) const;
72 /// Code Generation virtual methods...
74 virtual bool trackLivenessAfterRegAlloc(const MachineFunction &MF) const;
76 /// getMatchingSuperRegClass - Return a subclass of the specified register
77 /// class A so that each register in it has a sub-register of the
78 /// specified sub-register index which is in the specified register class B.
79 virtual const TargetRegisterClass *
80 getMatchingSuperRegClass(const TargetRegisterClass *A,
81 const TargetRegisterClass *B, unsigned Idx) const;
83 virtual const TargetRegisterClass *
84 getSubClassWithSubReg(const TargetRegisterClass *RC, unsigned Idx) const;
86 const TargetRegisterClass*
87 getLargestLegalSuperClass(const TargetRegisterClass *RC) const;
89 /// getPointerRegClass - Returns a TargetRegisterClass used for pointer
91 const TargetRegisterClass *
92 getPointerRegClass(const MachineFunction &MF, unsigned Kind = 0) const;
94 /// getCrossCopyRegClass - Returns a legal register class to copy a register
95 /// in the specified class to or from. Returns NULL if it is possible to copy
96 /// between a two registers of the specified class.
97 const TargetRegisterClass *
98 getCrossCopyRegClass(const TargetRegisterClass *RC) const;
100 unsigned getRegPressureLimit(const TargetRegisterClass *RC,
101 MachineFunction &MF) const;
103 /// getCalleeSavedRegs - Return a null-terminated list of all of the
104 /// callee-save registers on this target.
105 const uint16_t *getCalleeSavedRegs(const MachineFunction* MF = 0) const;
106 const uint32_t *getCallPreservedMask(CallingConv::ID) const;
108 /// getReservedRegs - Returns a bitset indexed by physical register number
109 /// indicating if a register is a special register that has particular uses and
110 /// should be considered unavailable at all times, e.g. SP, RA. This is used by
111 /// register scavenger to determine what registers are free.
112 BitVector getReservedRegs(const MachineFunction &MF) const;
114 bool hasBasePointer(const MachineFunction &MF) const;
116 bool canRealignStack(const MachineFunction &MF) const;
118 bool needsStackRealignment(const MachineFunction &MF) const;
120 bool hasReservedSpillSlot(const MachineFunction &MF, unsigned Reg,
121 int &FrameIdx) const;
123 void eliminateCallFramePseudoInstr(MachineFunction &MF,
124 MachineBasicBlock &MBB,
125 MachineBasicBlock::iterator MI) const;
127 void eliminateFrameIndex(MachineBasicBlock::iterator MI,
128 int SPAdj, RegScavenger *RS = NULL) const;
130 // Debug information queries.
131 unsigned getFrameRegister(const MachineFunction &MF) const;
132 unsigned getStackRegister() const { return StackPtr; }
133 unsigned getBaseRegister() const { return BasePtr; }
134 // FIXME: Move to FrameInfok
135 unsigned getSlotSize() const { return SlotSize; }
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, EVT::i16) return X86:AX
145 unsigned getX86SubSuperRegister(unsigned, EVT, bool High=false);
147 } // End llvm namespace