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 // FIXME: This should be tablegen'd like getDwarfRegNum is
62 int getSEHRegNum(unsigned i) const;
64 /// getCompactUnwindRegNum - This function maps the register to the number for
65 /// compact unwind encoding. Return -1 if the register isn't valid.
66 int getCompactUnwindRegNum(unsigned RegNum, bool isEH) const;
68 /// Code Generation virtual methods...
70 virtual bool trackLivenessAfterRegAlloc(const MachineFunction &MF) const;
72 /// getMatchingSuperRegClass - Return a subclass of the specified register
73 /// class A so that each register in it has a sub-register of the
74 /// specified sub-register index which is in the specified register class B.
75 virtual const TargetRegisterClass *
76 getMatchingSuperRegClass(const TargetRegisterClass *A,
77 const TargetRegisterClass *B, unsigned Idx) const;
79 virtual const TargetRegisterClass *
80 getSubClassWithSubReg(const TargetRegisterClass *RC, unsigned Idx) const;
82 const TargetRegisterClass*
83 getLargestLegalSuperClass(const TargetRegisterClass *RC) const;
85 /// getPointerRegClass - Returns a TargetRegisterClass used for pointer
87 const TargetRegisterClass *
88 getPointerRegClass(const MachineFunction &MF, unsigned Kind = 0) const;
90 /// getCrossCopyRegClass - Returns a legal register class to copy a register
91 /// in the specified class to or from. Returns NULL if it is possible to copy
92 /// between a two registers of the specified class.
93 const TargetRegisterClass *
94 getCrossCopyRegClass(const TargetRegisterClass *RC) const;
96 unsigned getRegPressureLimit(const TargetRegisterClass *RC,
97 MachineFunction &MF) const;
99 /// getCalleeSavedRegs - Return a null-terminated list of all of the
100 /// callee-save registers on this target.
101 const uint16_t *getCalleeSavedRegs(const MachineFunction* MF = 0) const;
102 const uint32_t *getCallPreservedMask(CallingConv::ID) const;
103 const uint32_t *getNoPreservedMask() const;
105 /// getReservedRegs - Returns a bitset indexed by physical register number
106 /// indicating if a register is a special register that has particular uses and
107 /// should be considered unavailable at all times, e.g. SP, RA. This is used by
108 /// register scavenger to determine what registers are free.
109 BitVector getReservedRegs(const MachineFunction &MF) const;
111 bool hasBasePointer(const MachineFunction &MF) const;
113 bool canRealignStack(const MachineFunction &MF) const;
115 bool needsStackRealignment(const MachineFunction &MF) const;
117 bool hasReservedSpillSlot(const MachineFunction &MF, unsigned Reg,
118 int &FrameIdx) const;
120 void eliminateFrameIndex(MachineBasicBlock::iterator MI,
121 int SPAdj, unsigned FIOperandNum,
122 RegScavenger *RS = NULL) const;
124 // Debug information queries.
125 unsigned getFrameRegister(const MachineFunction &MF) const;
126 unsigned getStackRegister() const { return StackPtr; }
127 unsigned getBaseRegister() const { return BasePtr; }
128 // FIXME: Move to FrameInfok
129 unsigned getSlotSize() const { return SlotSize; }
131 // Exception handling queries.
132 unsigned getEHExceptionRegister() const;
133 unsigned getEHHandlerRegister() const;
136 // getX86SubSuperRegister - X86 utility function. It returns the sub or super
137 // register of a specific X86 register.
138 // e.g. getX86SubSuperRegister(X86::EAX, MVT::i16) return X86:AX
139 unsigned getX86SubSuperRegister(unsigned, MVT::SimpleValueType, bool High=false);
141 } // End llvm namespace