LLVM 17.0.0git
Public Member Functions | List of all members
llvm::X86RegisterInfo Class Referencefinal

#include "Target/X86/X86RegisterInfo.h"

Inheritance diagram for llvm::X86RegisterInfo:
Inheritance graph
[legend]

Public Member Functions

 X86RegisterInfo (const Triple &TT)
 
int getSEHRegNum (unsigned i) const
 
const TargetRegisterClass * getMatchingSuperRegClass (const TargetRegisterClass *A, const TargetRegisterClass *B, unsigned Idx) 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 * getSubClassWithSubReg (const TargetRegisterClass *RC, unsigned Idx) const override
 
const TargetRegisterClass * getLargestLegalSuperClass (const TargetRegisterClass *RC, const MachineFunction &MF) const override
 
bool shouldRewriteCopySrc (const TargetRegisterClass *DefRC, unsigned DefSubReg, const TargetRegisterClass *SrcRC, unsigned SrcSubReg) const override
 
const TargetRegisterClass * getPointerRegClass (const MachineFunction &MF, unsigned Kind=0) const override
 getPointerRegClass - Returns a TargetRegisterClass used for pointer values.
 
const TargetRegisterClass * getCrossCopyRegClass (const TargetRegisterClass *RC) const override
 getCrossCopyRegClass - Returns a legal register class to copy a register in the specified class to or from.
 
const TargetRegisterClass * getGPRsForTailCall (const MachineFunction &MF) const
 getGPRsForTailCall - Returns a register class with registers that can be used in forming tail calls.
 
unsigned getRegPressureLimit (const TargetRegisterClass *RC, MachineFunction &MF) const override
 
const MCPhysReg * getCalleeSavedRegs (const MachineFunction *MF) const override
 getCalleeSavedRegs - Return a null-terminated list of all of the callee-save registers on this target.
 
const MCPhysReg * getCalleeSavedRegsViaCopy (const MachineFunction *MF) const
 
const uint32_t * getCallPreservedMask (const MachineFunction &MF, CallingConv::ID) const override
 
const uint32_t * getNoPreservedMask () const override
 
const uint32_t * getDarwinTLSCallPreservedMask () const
 
BitVector getReservedRegs (const MachineFunction &MF) const override
 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.
 
bool isArgumentRegister (const MachineFunction &MF, MCRegister Reg) const override
 isArgumentReg - Returns true if Reg can be used as an argument to a function.
 
bool isTileRegisterClass (const TargetRegisterClass *RC) const
 Return true if it is tile register class.
 
bool isFixedRegister (const MachineFunction &MF, MCRegister PhysReg) const override
 Returns true if PhysReg is a fixed register.
 
void adjustStackMapLiveOutMask (uint32_t *Mask) const override
 
bool hasBasePointer (const MachineFunction &MF) const
 
bool canRealignStack (const MachineFunction &MF) const override
 
bool shouldRealignStack (const MachineFunction &MF) const override
 
void eliminateFrameIndex (MachineBasicBlock::iterator II, unsigned FIOperandNum, Register BaseReg, int FIOffset) const
 
bool eliminateFrameIndex (MachineBasicBlock::iterator MI, int SPAdj, unsigned FIOperandNum, RegScavenger *RS=nullptr) const override
 
unsigned findDeadCallerSavedReg (MachineBasicBlock &MBB, MachineBasicBlock::iterator &MBBI) const
 findDeadCallerSavedReg - Return a caller-saved register that isn't live when it reaches the "return" instruction.
 
Register getFrameRegister (const MachineFunction &MF) const override
 
unsigned getPtrSizedFrameRegister (const MachineFunction &MF) const
 
unsigned getPtrSizedStackRegister (const MachineFunction &MF) const
 
Register getStackRegister () const
 
Register getBaseRegister () const
 
Register getFramePtr () const
 Returns physical register used as frame pointer.
 
unsigned getSlotSize () const
 
bool getRegAllocationHints (Register VirtReg, ArrayRef< MCPhysReg > Order, SmallVectorImpl< MCPhysReg > &Hints, const MachineFunction &MF, const VirtRegMap *VRM, const LiveRegMatrix *Matrix) const override
 

Detailed Description

Definition at line 24 of file X86RegisterInfo.h.

Constructor & Destructor Documentation

◆ X86RegisterInfo()

X86RegisterInfo::X86RegisterInfo ( const Triple &  TT)
explicit

Definition at line 48 of file X86RegisterInfo.cpp.

References llvm::X86_MC::initLLVMToSEHAndCVRegMapping().

Member Function Documentation

◆ adjustStackMapLiveOutMask()

void X86RegisterInfo::adjustStackMapLiveOutMask ( uint32_t *  Mask) const
override

Definition at line 679 of file X86RegisterInfo.cpp.

References assert().

◆ canRealignStack()

bool X86RegisterInfo::canRealignStack ( const MachineFunction &  MF) const
override

Definition at line 727 of file X86RegisterInfo.cpp.

References llvm::TargetRegisterInfo::canRealignStack(), CantUseSP(), llvm::MachineFunction::getFrameInfo(), llvm::MachineFunction::getRegInfo(), and MRI.

Referenced by llvm::X86InstrInfo::loadRegFromStackSlot(), and llvm::X86InstrInfo::storeRegToStackSlot().

◆ eliminateFrameIndex() [1/2]

void X86RegisterInfo::eliminateFrameIndex ( MachineBasicBlock::iterator  II,
unsigned  FIOperandNum,
Register  BaseReg,
int  FIOffset 
) const

Definition at line 793 of file X86RegisterInfo.cpp.

References assert(), llvm::MachineOperand::ChangeToImmediate(), MI, and llvm::Offset.

◆ eliminateFrameIndex() [2/2]

bool X86RegisterInfo::eliminateFrameIndex ( MachineBasicBlock::iterator  MI,
int  SPAdj,
unsigned  FIOperandNum,
RegScavenger *  RS = nullptr 
) const
override

Definition at line 833 of file X86RegisterInfo.cpp.

References assert(), llvm::MachineOperand::ChangeToImmediate(), contains(), llvm::MachineBasicBlock::end(), llvm::MachineBasicBlock::getFirstTerminator(), llvm::StackOffset::getFixed(), llvm::X86FrameLowering::getFrameIndexReference(), llvm::X86FrameLowering::getFrameIndexReferenceSP(), llvm::MachineFunction::getFrameInfo(), llvm::MachineBasicBlock::getParent(), llvm::X86FrameLowering::getWin64EHFrameIndexRef(), llvm::getX86SubSuperRegister(), llvm::X86FrameLowering::Is64Bit, llvm::MachineBasicBlock::isEHFuncletEntry(), llvm::MachineFrameInfo::isFixedObjectIndex(), isFuncletReturnInstr(), MBB, MBBI, MI, llvm::Offset, and tryOptimizeLEAtoMOV().

◆ findDeadCallerSavedReg()

unsigned X86RegisterInfo::findDeadCallerSavedReg ( MachineBasicBlock &  MBB,
MachineBasicBlock::iterator &  MBBI 
) const

findDeadCallerSavedReg - Return a caller-saved register that isn't live when it reaches the "return" instruction.

We can then pop a stack object to this register without worry about clobbering it.

Definition at line 913 of file X86RegisterInfo.cpp.

References llvm::MachineFunction::callsEHReturn(), llvm::MachineBasicBlock::end(), getGPRsForTailCall(), llvm::MachineBasicBlock::getParent(), llvm::MCRegAliasIterator::isValid(), MBB, MBBI, and Uses.

Referenced by llvm::X86FrameLowering::emitSPUpdate().

◆ getBaseRegister()

Register llvm::X86RegisterInfo::getBaseRegister ( ) const
inline

Definition at line 157 of file X86RegisterInfo.h.

Referenced by llvm::X86FrameLowering::determineCalleeSaves(), llvm::X86FrameLowering::emitPrologue(), llvm::X86FrameLowering::getFrameIndexReference(), getReservedRegs(), and llvm::X86FrameLowering::restoreWin32EHStackPointers().

◆ getCalleeSavedRegs()

const MCPhysReg * X86RegisterInfo::getCalleeSavedRegs ( const MachineFunction *  MF) const
override

getCalleeSavedRegs - Return a null-terminated list of all of the callee-save registers on this target.

Definition at line 278 of file X86RegisterInfo.cpp.

References llvm::CallingConv::AnyReg, assert(), llvm::MachineFunction::callsEHReturn(), CC, llvm::CallingConv::CFGuard_Check, llvm::CallingConv::Cold, llvm::CallingConv::CXX_FAST_TLS, F, llvm::MachineFunction::getFunction(), llvm::MachineFunction::getInfo(), llvm::MachineFunction::getSubtarget(), llvm::X86Subtarget::getTargetLowering(), llvm::CallingConv::GHC, llvm::X86Subtarget::hasAVX(), llvm::X86Subtarget::hasAVX512(), llvm::Function::hasFnAttribute(), llvm::X86Subtarget::hasSSE1(), llvm::CallingConv::HiPE, llvm::CallingConv::Intel_OCL_BI, llvm::CallingConv::PreserveAll, llvm::CallingConv::PreserveMost, llvm::X86TargetLowering::supportSwiftError(), llvm::CallingConv::SwiftTail, llvm::CallingConv::Win64, llvm::CallingConv::X86_64_SysV, llvm::CallingConv::X86_INTR, and llvm::CallingConv::X86_RegCall.

◆ getCalleeSavedRegsViaCopy()

const MCPhysReg * X86RegisterInfo::getCalleeSavedRegsViaCopy ( const MachineFunction *  MF) const

Definition at line 404 of file X86RegisterInfo.cpp.

References assert(), llvm::CallingConv::CXX_FAST_TLS, llvm::Function::getCallingConv(), llvm::MachineFunction::getFunction(), llvm::MachineFunction::getInfo(), and llvm::X86MachineFunctionInfo::isSplitCSR().

◆ getCallPreservedMask()

const uint32_t * X86RegisterInfo::getCallPreservedMask ( const MachineFunction &  MF,
CallingConv::ID  CC 
) const
override

Definition at line 414 of file X86RegisterInfo.cpp.

References llvm::CallingConv::AnyReg, assert(), CC, llvm::CallingConv::CFGuard_Check, llvm::CallingConv::Cold, llvm::CallingConv::CXX_FAST_TLS, F, llvm::MachineFunction::getFunction(), llvm::MachineFunction::getSubtarget(), llvm::X86Subtarget::getTargetLowering(), llvm::CallingConv::GHC, llvm::X86Subtarget::hasAVX(), llvm::X86Subtarget::hasAVX512(), llvm::X86Subtarget::hasSSE1(), llvm::CallingConv::HiPE, llvm::CallingConv::Intel_OCL_BI, llvm::CallingConv::PreserveAll, llvm::CallingConv::PreserveMost, llvm::X86TargetLowering::supportSwiftError(), llvm::CallingConv::SwiftTail, llvm::CallingConv::Win64, llvm::CallingConv::X86_64_SysV, llvm::CallingConv::X86_INTR, and llvm::CallingConv::X86_RegCall.

Referenced by getReservedRegs().

◆ getCrossCopyRegClass()

const TargetRegisterClass * X86RegisterInfo::getCrossCopyRegClass ( const TargetRegisterClass *  RC) 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.

Definition at line 247 of file X86RegisterInfo.cpp.

◆ getDarwinTLSCallPreservedMask()

const uint32_t * X86RegisterInfo::getDarwinTLSCallPreservedMask ( ) const

Definition at line 523 of file X86RegisterInfo.cpp.

◆ getFramePtr()

Register llvm::X86RegisterInfo::getFramePtr ( ) const
inline

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.

Definition at line 162 of file X86RegisterInfo.h.

Referenced by llvm::X86FrameLowering::getFrameIndexReference().

◆ getFrameRegister()

Register X86RegisterInfo::getFrameRegister ( const MachineFunction &  MF) const
override

Definition at line 961 of file X86RegisterInfo.cpp.

References llvm::X86FrameLowering::hasFP().

Referenced by llvm::X86FrameLowering::assignCalleeSavedSpillSlots(), llvm::X86FrameLowering::emitCalleeSavedFrameMoves(), llvm::X86FrameLowering::emitCalleeSavedFrameMovesFullCFA(), llvm::X86FrameLowering::emitEpilogue(), llvm::X86FrameLowering::emitPrologue(), llvm::X86FrameLowering::getFrameIndexReference(), getPtrSizedFrameRegister(), and llvm::X86FrameLowering::restoreWin32EHStackPointers().

◆ getGPRsForTailCall()

const TargetRegisterClass * X86RegisterInfo::getGPRsForTailCall ( const MachineFunction &  MF) const

getGPRsForTailCall - Returns a register class with registers that can be used in forming tail calls.

Definition at line 233 of file X86RegisterInfo.cpp.

References F, llvm::MachineFunction::getFunction(), llvm::CallingConv::HiPE, and llvm::CallingConv::Win64.

Referenced by findDeadCallerSavedReg(), and getPointerRegClass().

◆ getLargestLegalSuperClass()

const TargetRegisterClass * X86RegisterInfo::getLargestLegalSuperClass ( const TargetRegisterClass *  RC,
const MachineFunction &  MF 
) const
override

Definition at line 110 of file X86RegisterInfo.cpp.

References llvm::MachineFunction::getSubtarget(), llvm::TargetRegisterClass::getSuperClasses(), llvm::X86Subtarget::hasAVX512(), and I.

◆ getMatchingSuperRegClass()

const TargetRegisterClass * X86RegisterInfo::getMatchingSuperRegClass ( const TargetRegisterClass *  A,
const TargetRegisterClass *  B,
unsigned  Idx 
) 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.

Definition at line 97 of file X86RegisterInfo.cpp.

References A, and B.

◆ getNoPreservedMask()

const uint32_t * X86RegisterInfo::getNoPreservedMask ( ) const
override

Definition at line 519 of file X86RegisterInfo.cpp.

◆ getPointerRegClass()

const TargetRegisterClass * X86RegisterInfo::getPointerRegClass ( const MachineFunction &  MF,
unsigned  Kind = 0 
) const
override

getPointerRegClass - Returns a TargetRegisterClass used for pointer values.

Definition at line 177 of file X86RegisterInfo.cpp.

References getGPRsForTailCall(), llvm::MachineFunction::getSubtarget(), llvm::X86FrameLowering::hasFP(), llvm::X86Subtarget::isTarget64BitLP64(), llvm_unreachable, and llvm::X86FrameLowering::Uses64BitFramePtr.

◆ getPtrSizedFrameRegister()

unsigned X86RegisterInfo::getPtrSizedFrameRegister ( const MachineFunction &  MF) const

Definition at line 967 of file X86RegisterInfo.cpp.

References getFrameRegister(), llvm::MachineFunction::getSubtarget(), llvm::getX86SubSuperRegister(), and llvm::X86Subtarget::isTarget64BitILP32().

Referenced by llvm::X86TargetLowering::getRegisterByName().

◆ getPtrSizedStackRegister()

unsigned X86RegisterInfo::getPtrSizedStackRegister ( const MachineFunction &  MF) const

Definition at line 976 of file X86RegisterInfo.cpp.

References getStackRegister(), llvm::MachineFunction::getSubtarget(), llvm::getX86SubSuperRegister(), and llvm::X86Subtarget::isTarget64BitILP32().

◆ getRegAllocationHints()

bool X86RegisterInfo::getRegAllocationHints ( Register  VirtReg,
ArrayRef< MCPhysReg >  Order,
SmallVectorImpl< MCPhysReg > &  Hints,
const MachineFunction &  MF,
const VirtRegMap *  VRM,
const LiveRegMatrix *  Matrix 
) const
override

Definition at line 1022 of file X86RegisterInfo.cpp.

References llvm::SmallVectorTemplateCommon< T, typename >::begin(), llvm::SmallVectorImpl< T >::clear(), llvm::TargetRegisterClass::contains(), llvm::SmallSet< T, N, C >::count(), llvm::dbgs(), llvm::SmallVectorTemplateCommon< T, typename >::end(), llvm::format_hex(), llvm::TargetRegisterClass::getID(), llvm::TargetRegisterInfo::getRegAllocationHints(), llvm::MachineFunction::getRegInfo(), getTileShape(), llvm::SmallSet< T, N, C >::insert(), LLVM_DEBUG, Matrix, MRI, llvm::MCRegister::NoRegister, and llvm::SmallVectorTemplateBase< T, bool >::push_back().

◆ getRegPressureLimit()

unsigned X86RegisterInfo::getRegPressureLimit ( const TargetRegisterClass *  RC,
MachineFunction &  MF 
) const
override

Definition at line 258 of file X86RegisterInfo.cpp.

References llvm::TargetRegisterClass::getID(), and llvm::X86FrameLowering::hasFP().

◆ getReservedRegs()

BitVector X86RegisterInfo::getReservedRegs ( const MachineFunction &  MF) const
override

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.

Definition at line 527 of file X86RegisterInfo.cpp.

References assert(), CC, llvm::MachineOperand::clobbersPhysReg(), getBaseRegister(), llvm::Function::getCallingConv(), getCallPreservedMask(), llvm::MachineFunction::getFunction(), llvm::MachineFunction::getSubtarget(), llvm::getX86SubSuperRegister(), llvm::X86Subtarget::hasAVX512(), hasBasePointer(), llvm::X86FrameLowering::hasFP(), llvm::MCRegAliasIterator::isValid(), llvm::report_fatal_error(), llvm::Reserved, and SubReg.

◆ getSEHRegNum()

int X86RegisterInfo::getSEHRegNum ( unsigned  i) const

Definition at line 80 of file X86RegisterInfo.cpp.

◆ getSlotSize()

unsigned llvm::X86RegisterInfo::getSlotSize ( ) const
inline

Definition at line 164 of file X86RegisterInfo.h.

Referenced by llvm::X86AsmPrinter::emitInstruction(), llvm::X86FrameLowering::getInitialCFAOffset(), llvm::X86TargetLowering::getReturnAddressFrameIndex(), llvm::X86MachineFunctionInfo::setRestoreBasePointer(), and llvm::X86FrameLowering::X86FrameLowering().

◆ getStackRegister()

Register llvm::X86RegisterInfo::getStackRegister ( ) const
inline

Definition at line 156 of file X86RegisterInfo.h.

Referenced by llvm::X86FrameLowering::getFrameIndexReference(), llvm::X86FrameLowering::getFrameIndexReferenceSP(), getPtrSizedStackRegister(), llvm::X86FrameLowering::getWin64EHFrameIndexRef(), llvm::X86FrameLowering::X86FrameLowering(), and llvm::X86TargetLowering::X86TargetLowering().

◆ getSubClassWithSubReg()

const TargetRegisterClass * X86RegisterInfo::getSubClassWithSubReg ( const TargetRegisterClass *  RC,
unsigned  Idx 
) const
override

Definition at line 85 of file X86RegisterInfo.cpp.

References Idx.

◆ hasBasePointer()

bool X86RegisterInfo::hasBasePointer ( const MachineFunction &  MF) const

Definition at line 703 of file X86RegisterInfo.cpp.

References CantUseSP(), EnableBasePointer, llvm::MachineFunction::getFrameInfo(), llvm::MachineFunction::getInfo(), llvm::X86MachineFunctionInfo::getStackPtrSaveMI(), and llvm::X86MachineFunctionInfo::hasPreallocatedCall().

Referenced by llvm::X86FrameLowering::canSimplifyCallFramePseudos(), llvm::X86FrameLowering::determineCalleeSaves(), llvm::X86FrameLowering::emitPrologue(), llvm::X86FrameLowering::getFrameIndexReference(), and getReservedRegs().

◆ isArgumentRegister()

bool X86RegisterInfo::isArgumentRegister ( const MachineFunction &  MF,
MCRegister  Reg 
) const
override

isArgumentReg - Returns true if Reg can be used as an argument to a function.

Definition at line 619 of file X86RegisterInfo.cpp.

References llvm::any_of(), CC, llvm::Function::getCallingConv(), llvm::MachineFunction::getFunction(), llvm::MachineFunction::getSubtarget(), TRI, llvm::CallingConv::Win64, and llvm::CallingConv::X86_64_SysV.

◆ isFixedRegister()

bool X86RegisterInfo::isFixedRegister ( const MachineFunction &  MF,
MCRegister  PhysReg 
) const
override

Returns true if PhysReg is a fixed register.

Definition at line 658 of file X86RegisterInfo.cpp.

References llvm::MachineFunction::getSubtarget(), llvm::X86FrameLowering::hasFP(), and TRI.

◆ isTileRegisterClass()

bool X86RegisterInfo::isTileRegisterClass ( const TargetRegisterClass *  RC) const

Return true if it is tile register class.

Definition at line 675 of file X86RegisterInfo.cpp.

References llvm::TargetRegisterClass::getID().

◆ shouldRealignStack()

bool X86RegisterInfo::shouldRealignStack ( const MachineFunction &  MF) const
override

Definition at line 746 of file X86RegisterInfo.cpp.

References llvm::Function::getCallingConv(), llvm::MachineFunction::getFunction(), llvm::TargetRegisterInfo::shouldRealignStack(), and llvm::CallingConv::X86_INTR.

◆ shouldRewriteCopySrc()

bool X86RegisterInfo::shouldRewriteCopySrc ( const TargetRegisterClass *  DefRC,
unsigned  DefSubReg,
const TargetRegisterClass *  SrcRC,
unsigned  SrcSubReg 
) const
override

Definition at line 217 of file X86RegisterInfo.cpp.

References llvm::TargetRegisterClass::hasSuperClassEq(), and llvm::TargetRegisterInfo::shouldRewriteCopySrc().

The documentation for this class was generated from the following files:
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