1 //===- X86RegisterInfo.h - X86 Register Information Impl --------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by the LLVM research group and is distributed under
6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file contains the X86 implementation of the MRegisterInfo class.
12 //===----------------------------------------------------------------------===//
14 #ifndef X86REGISTERINFO_H
15 #define X86REGISTERINFO_H
17 #include "llvm/Target/MRegisterInfo.h"
18 #include "X86GenRegisterInfo.h.inc"
22 class TargetInstrInfo;
24 struct X86RegisterInfo : public X86GenRegisterInfo {
25 const TargetInstrInfo &TII;
26 X86RegisterInfo(const TargetInstrInfo &tii);
28 /// Code Generation virtual methods...
29 void storeRegToStackSlot(MachineBasicBlock &MBB,
30 MachineBasicBlock::iterator MI,
31 unsigned SrcReg, int FrameIndex,
32 const TargetRegisterClass *RC) const;
34 void loadRegFromStackSlot(MachineBasicBlock &MBB,
35 MachineBasicBlock::iterator MI,
36 unsigned DestReg, int FrameIndex,
37 const TargetRegisterClass *RC) const;
39 void copyRegToReg(MachineBasicBlock &MBB,
40 MachineBasicBlock::iterator MI,
41 unsigned DestReg, unsigned SrcReg,
42 const TargetRegisterClass *RC) const;
44 /// foldMemoryOperand - If this target supports it, fold a load or store of
45 /// the specified stack slot into the specified machine instruction for the
46 /// specified operand. If this is possible, the target should perform the
47 /// folding and return true, otherwise it should return false. If it folds
48 /// the instruction, it is likely that the MachineInstruction the iterator
49 /// references has been changed.
50 MachineInstr* foldMemoryOperand(MachineInstr* MI,
52 int FrameIndex) const;
54 /// getCalleeSaveRegs - Return a null-terminated list of all of the
55 /// callee-save registers on this target.
56 const unsigned *getCalleeSaveRegs() const;
58 /// getCalleeSaveRegClasses - Return a null-terminated list of the preferred
59 /// register classes to spill each callee-saved register with. The order and
60 /// length of this list match the getCalleeSaveRegs() list.
61 const TargetRegisterClass* const* getCalleeSaveRegClasses() const;
63 void eliminateCallFramePseudoInstr(MachineFunction &MF,
64 MachineBasicBlock &MBB,
65 MachineBasicBlock::iterator MI) const;
67 void eliminateFrameIndex(MachineBasicBlock::iterator MI) const;
69 void processFunctionBeforeFrameFinalized(MachineFunction &MF) const;
71 void emitPrologue(MachineFunction &MF) const;
72 void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const;
74 // Debug information queries.
75 unsigned getRARegister() const;
76 unsigned getFrameRegister(MachineFunction &MF) const;
79 // getX86SubSuperRegister - X86 utility function. It returns the sub or super
80 // register of a specific X86 register.
81 // e.g. getX86SubSuperRegister(X86::EAX, MVT::i16) return X86:AX
82 unsigned getX86SubSuperRegister(unsigned, MVT::ValueType, bool High=false);
84 } // End llvm namespace