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//===- X86RegisterInfo.h - X86 Register Information Impl --------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains the X86 implementation of the MRegisterInfo class.
//
//===----------------------------------------------------------------------===//
#ifndef X86REGISTERINFO_H
#define X86REGISTERINFO_H
#include "llvm/Target/MRegisterInfo.h"
#include "X86GenRegisterInfo.h.inc"
namespace llvm {
class Type;
class TargetInstrInfo;
class X86TargetMachine;
class X86RegisterInfo : public X86GenRegisterInfo {
public:
X86TargetMachine &TM;
const TargetInstrInfo &TII;
private:
/// Is64Bit - Is the target 64-bits.
bool Is64Bit;
/// SlotSize - Stack slot size in bytes.
unsigned SlotSize;
/// StackPtr - X86 physical register used as stack ptr.
unsigned StackPtr;
/// FramePtr - X86 physical register used as frame ptr.
unsigned FramePtr;
public:
X86RegisterInfo(X86TargetMachine &tm, const TargetInstrInfo &tii);
/// Code Generation virtual methods...
void storeRegToStackSlot(MachineBasicBlock &MBB,
MachineBasicBlock::iterator MI,
unsigned SrcReg, int FrameIndex,
const TargetRegisterClass *RC) const;
void loadRegFromStackSlot(MachineBasicBlock &MBB,
MachineBasicBlock::iterator MI,
unsigned DestReg, int FrameIndex,
const TargetRegisterClass *RC) const;
void copyRegToReg(MachineBasicBlock &MBB,
MachineBasicBlock::iterator MI,
unsigned DestReg, unsigned SrcReg,
const TargetRegisterClass *RC) const;
/// foldMemoryOperand - If this target supports it, fold a load or store of
/// the specified stack slot into the specified machine instruction for the
/// specified operand. If this is possible, the target should perform the
/// folding and return true, otherwise it should return false. If it folds
/// the instruction, it is likely that the MachineInstruction the iterator
/// references has been changed.
MachineInstr* foldMemoryOperand(MachineInstr* MI,
unsigned OpNum,
int FrameIndex) const;
/// getCalleeSaveRegs - Return a null-terminated list of all of the
/// callee-save registers on this target.
const unsigned *getCalleeSaveRegs() const;
/// getCalleeSaveRegClasses - Return a null-terminated list of the preferred
/// register classes to spill each callee-saved register with. The order and
/// length of this list match the getCalleeSaveRegs() list.
const TargetRegisterClass* const* getCalleeSaveRegClasses() const;
void eliminateCallFramePseudoInstr(MachineFunction &MF,
MachineBasicBlock &MBB,
MachineBasicBlock::iterator MI) const;
void eliminateFrameIndex(MachineBasicBlock::iterator MI) const;
void processFunctionBeforeFrameFinalized(MachineFunction &MF) const;
void emitPrologue(MachineFunction &MF) const;
void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const;
// Debug information queries.
unsigned getRARegister() const;
unsigned getFrameRegister(MachineFunction &MF) const;
};
// getX86SubSuperRegister - X86 utility function. It returns the sub or super
// register of a specific X86 register.
// e.g. getX86SubSuperRegister(X86::EAX, MVT::i16) return X86:AX
unsigned getX86SubSuperRegister(unsigned, MVT::ValueType, bool High=false);
} // End llvm namespace
#endif
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