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//===-- X86RegisterInfo.h - X86 Register Information Impl -------*- C++ -*-===//
// The LLVM Compiler Infrastructure
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
// This file contains the X86 implementation of the TargetRegisterInfo class.
#include "llvm/CodeGen/TargetRegisterInfo.h"
#include ""
namespace llvm {
class Triple;
class X86RegisterInfo final : public X86GenRegisterInfo {
/// Is64Bit - Is the target 64-bits.
bool Is64Bit;
/// IsWin64 - Is the target on of win64 flavours
bool IsWin64;
/// 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;
/// BasePtr - X86 physical register used as a base ptr in complex stack
/// frames. I.e., when we need a 3rd base, not just SP and FP, due to
/// variable size stack objects.
unsigned BasePtr;
X86RegisterInfo(const Triple &TT);
// FIXME: This should be tablegen'd like getDwarfRegNum is
int getSEHRegNum(unsigned i) const;
/// Code Generation virtual methods...
bool trackLivenessAfterRegAlloc(const MachineFunction &MF) const override;
/// getMatchingSuperRegClass - Return a subclass of the specified register
/// class A so that each register in it has a sub-register of the
/// specified sub-register index which is in the specified register class B.
const TargetRegisterClass *
getMatchingSuperRegClass(const TargetRegisterClass *A,
const TargetRegisterClass *B,
unsigned Idx) const override;
const TargetRegisterClass *
getSubClassWithSubReg(const TargetRegisterClass *RC,
unsigned Idx) const override;
const TargetRegisterClass *
getLargestLegalSuperClass(const TargetRegisterClass *RC,
const MachineFunction &MF) const override;
/// getPointerRegClass - Returns a TargetRegisterClass used for pointer
/// values.
const TargetRegisterClass *
getPointerRegClass(const MachineFunction &MF,
unsigned Kind = 0) const override;
/// getCrossCopyRegClass - Returns a legal register class to copy a register
/// in the specified class to or from. Returns NULL if it is possible to copy
/// between a two registers of the specified class.
const TargetRegisterClass *
getCrossCopyRegClass(const TargetRegisterClass *RC) const override;
/// getGPRsForTailCall - Returns a register class with registers that can be
/// used in forming tail calls.
const TargetRegisterClass *
getGPRsForTailCall(const MachineFunction &MF) const;
unsigned getRegPressureLimit(const TargetRegisterClass *RC,
MachineFunction &MF) const override;
/// getCalleeSavedRegs - Return a null-terminated list of all of the
/// callee-save registers on this target.
const MCPhysReg *
getCalleeSavedRegs(const MachineFunction* MF) const override;
const MCPhysReg *
getCalleeSavedRegsViaCopy(const MachineFunction *MF) const;
const uint32_t *getCallPreservedMask(const MachineFunction &MF,
CallingConv::ID) const override;
const uint32_t *getNoPreservedMask() const override;
// Calls involved in thread-local variable lookup save more registers than
// normal calls, so they need a different mask to represent this.
const uint32_t *getDarwinTLSCallPreservedMask() const;
/// getReservedRegs - Returns a bitset indexed by physical register number
/// indicating if a register is a special register that has particular uses and
/// should be considered unavailable at all times, e.g. SP, RA. This is used by
/// register scavenger to determine what registers are free.
BitVector getReservedRegs(const MachineFunction &MF) const override;
void adjustStackMapLiveOutMask(uint32_t *Mask) const override;
bool hasBasePointer(const MachineFunction &MF) const;
bool canRealignStack(const MachineFunction &MF) const override;
bool hasReservedSpillSlot(const MachineFunction &MF, unsigned Reg,
int &FrameIdx) const override;
void eliminateFrameIndex(MachineBasicBlock::iterator MI,
int SPAdj, unsigned FIOperandNum,
RegScavenger *RS = nullptr) const override;
// Debug information queries.
unsigned getFrameRegister(const MachineFunction &MF) const override;
unsigned getPtrSizedFrameRegister(const MachineFunction &MF) const;
unsigned getStackRegister() const { return StackPtr; }
unsigned getBaseRegister() const { return BasePtr; }
/// Returns physical register used as frame pointer.
/// This will always returns the frame pointer register, contrary to
/// getFrameRegister() which returns the "base pointer" in situations
/// involving a stack, frame and base pointer.
unsigned getFramePtr() const { return FramePtr; }
// FIXME: Move to FrameInfok
unsigned getSlotSize() const { return SlotSize; }
} // End llvm namespace