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 {
32 /// Is64Bit - Is the target 64-bits.
36 /// IsWin64 - Is the target on of win64 flavours
40 /// SlotSize - Stack slot size in bytes.
44 /// StackPtr - X86 physical register used as stack ptr.
48 /// FramePtr - X86 physical register used as frame ptr.
52 /// BasePtr - X86 physical register used as a base ptr in complex stack
53 /// frames. I.e., when we need a 3rd base, not just SP and FP, due to
54 /// variable size stack objects.
58 X86RegisterInfo(X86TargetMachine &tm);
60 // FIXME: This should be tablegen'd like getDwarfRegNum is
61 int getSEHRegNum(unsigned i) const;
63 /// getCompactUnwindRegNum - This function maps the register to the number for
64 /// compact unwind encoding. Return -1 if the register isn't valid.
65 int getCompactUnwindRegNum(unsigned RegNum, bool isEH) const;
67 /// Code Generation virtual methods...
69 virtual bool trackLivenessAfterRegAlloc(const MachineFunction &MF) const;
71 /// getMatchingSuperRegClass - Return a subclass of the specified register
72 /// class A so that each register in it has a sub-register of the
73 /// specified sub-register index which is in the specified register class B.
74 virtual const TargetRegisterClass *
75 getMatchingSuperRegClass(const TargetRegisterClass *A,
76 const TargetRegisterClass *B, unsigned Idx) const;
78 virtual const TargetRegisterClass *
79 getSubClassWithSubReg(const TargetRegisterClass *RC, unsigned Idx) const;
81 const TargetRegisterClass*
82 getLargestLegalSuperClass(const TargetRegisterClass *RC) const;
84 /// getPointerRegClass - Returns a TargetRegisterClass used for pointer
86 const TargetRegisterClass *
87 getPointerRegClass(const MachineFunction &MF, unsigned Kind = 0) const;
89 /// getCrossCopyRegClass - Returns a legal register class to copy a register
90 /// in the specified class to or from. Returns NULL if it is possible to copy
91 /// between a two registers of the specified class.
92 const TargetRegisterClass *
93 getCrossCopyRegClass(const TargetRegisterClass *RC) const;
95 unsigned getRegPressureLimit(const TargetRegisterClass *RC,
96 MachineFunction &MF) const;
98 /// getCalleeSavedRegs - Return a null-terminated list of all of the
99 /// callee-save registers on this target.
100 const uint16_t *getCalleeSavedRegs(const MachineFunction* MF = 0) const;
101 const uint32_t *getCallPreservedMask(CallingConv::ID) const;
102 const uint32_t *getNoPreservedMask() const;
104 /// getReservedRegs - Returns a bitset indexed by physical register number
105 /// indicating if a register is a special register that has particular uses and
106 /// should be considered unavailable at all times, e.g. SP, RA. This is used by
107 /// register scavenger to determine what registers are free.
108 BitVector getReservedRegs(const MachineFunction &MF) const;
110 bool hasBasePointer(const MachineFunction &MF) const;
112 bool canRealignStack(const MachineFunction &MF) const;
114 bool needsStackRealignment(const MachineFunction &MF) const;
116 bool hasReservedSpillSlot(const MachineFunction &MF, unsigned Reg,
117 int &FrameIdx) const;
119 void eliminateFrameIndex(MachineBasicBlock::iterator MI,
120 int SPAdj, unsigned FIOperandNum,
121 RegScavenger *RS = NULL) const;
123 // Debug information queries.
124 unsigned getFrameRegister(const MachineFunction &MF) const;
125 unsigned getStackRegister() const { return StackPtr; }
126 unsigned getBaseRegister() const { return BasePtr; }
127 // FIXME: Move to FrameInfok
128 unsigned getSlotSize() const { return SlotSize; }
130 // Exception handling queries.
131 unsigned getEHExceptionRegister() const;
132 unsigned getEHHandlerRegister() const;
135 // getX86SubSuperRegister - X86 utility function. It returns the sub or super
136 // register of a specific X86 register.
137 // e.g. getX86SubSuperRegister(X86::EAX, MVT::i16) return X86:AX
138 unsigned getX86SubSuperRegister(unsigned, MVT::SimpleValueType, bool High=false);
140 } // End llvm namespace