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
33 /// DWARFFlavour - Flavour of dwarf regnumbers
35 namespace DWARFFlavour
{
37 X86_64
= 0, X86_32_DarwinEH
= 1, X86_32_Generic
= 2
41 class X86RegisterInfo
: public X86GenRegisterInfo
{
44 const TargetInstrInfo
&TII
;
47 /// Is64Bit - Is the target 64-bits.
51 /// IsWin64 - Is the target on of win64 flavours
55 /// SlotSize - Stack slot size in bytes.
59 /// StackAlign - Default stack alignment.
63 /// StackPtr - X86 physical register used as stack ptr.
67 /// FramePtr - X86 physical register used as frame ptr.
72 X86RegisterInfo(X86TargetMachine
&tm
, const TargetInstrInfo
&tii
);
74 /// getX86RegNum - Returns the native X86 register number for the given LLVM
75 /// register identifier.
76 static unsigned getX86RegNum(unsigned RegNo
);
78 unsigned getStackAlignment() const { return StackAlign
; }
80 /// getDwarfRegNum - allows modification of X86GenRegisterInfo::getDwarfRegNum
81 /// (created by TableGen) for target dependencies.
82 int getDwarfRegNum(unsigned RegNum
, bool isEH
) const;
84 /// Code Generation virtual methods...
87 /// getMatchingSuperRegClass - Return a subclass of the specified register
88 /// class A so that each register in it has a sub-register of the
89 /// specified sub-register index which is in the specified register class B.
90 virtual const TargetRegisterClass
*
91 getMatchingSuperRegClass(const TargetRegisterClass
*A
,
92 const TargetRegisterClass
*B
, unsigned Idx
) const;
94 /// getPointerRegClass - Returns a TargetRegisterClass used for pointer
96 const TargetRegisterClass
*getPointerRegClass(unsigned Kind
= 0) const;
98 /// getCrossCopyRegClass - Returns a legal register class to copy a register
99 /// in the specified class to or from. Returns NULL if it is possible to copy
100 /// between a two registers of the specified class.
101 const TargetRegisterClass
*
102 getCrossCopyRegClass(const TargetRegisterClass
*RC
) const;
104 unsigned getRegPressureLimit(const TargetRegisterClass
*RC
,
105 MachineFunction
&MF
) const;
107 /// getCalleeSavedRegs - Return a null-terminated list of all of the
108 /// callee-save registers on this target.
109 const unsigned *getCalleeSavedRegs(const MachineFunction
* MF
= 0) const;
111 /// getReservedRegs - Returns a bitset indexed by physical register number
112 /// indicating if a register is a special register that has particular uses and
113 /// should be considered unavailable at all times, e.g. SP, RA. This is used by
114 /// register scavenger to determine what registers are free.
115 BitVector
getReservedRegs(const MachineFunction
&MF
) const;
117 bool canRealignStack(const MachineFunction
&MF
) const;
119 bool needsStackRealignment(const MachineFunction
&MF
) const;
121 bool hasReservedSpillSlot(const MachineFunction
&MF
, unsigned Reg
,
122 int &FrameIdx
) 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 // Debug information queries.
132 unsigned getRARegister() const;
133 unsigned getFrameRegister(const MachineFunction
&MF
) const;
134 unsigned getStackRegister() const { return StackPtr
; }
135 // FIXME: Move to FrameInfok
136 unsigned getSlotSize() const { return SlotSize
; }
138 // Exception handling queries.
139 unsigned getEHExceptionRegister() const;
140 unsigned getEHHandlerRegister() const;
143 // getX86SubSuperRegister - X86 utility function. It returns the sub or super
144 // register of a specific X86 register.
145 // e.g. getX86SubSuperRegister(X86::EAX, EVT::i16) return X86:AX
146 unsigned getX86SubSuperRegister(unsigned, EVT
, bool High
=false);
148 } // End llvm namespace