LLVM 24.0.0git
Public Member Functions | List of all members
llvm::X86RegisterInfo Class Referencefinal

#include "Target/X86/X86RegisterInfo.h"

Inheritance diagram for llvm::X86RegisterInfo:
[legend]

Public Member Functions

 X86RegisterInfo (const Triple &TT)
unsigned getNumSupportedRegs (const MachineFunction &MF) const override
 Return the number of registers for the function.
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
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.
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 * getIPRACSRegs (const MachineFunction *MF) const override
 getIPRACSRegs - This API can be removed when rbp is safe to optimized out when IPRA is on.
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
bool eliminateFrameIndicesBackwards () const override
 Process frame indices in forwards block order because X86InstrInfo::getSPAdjust relies on it when searching for the ADJCALLSTACKUP pseudo following a call.
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
Register getPtrSizedFrameRegister (const MachineFunction &MF) const
Register 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, SmallSetVector< MCPhysReg, 16 > &Hints, const MachineFunction &MF, const VirtRegMap *VRM, const LiveRegMatrix *Matrix) const override
const TargetRegisterClass * constrainRegClassToNonRex2 (const TargetRegisterClass *RC) const
bool isNonRex2RegClass (const TargetRegisterClass *RC) const
bool requiresRegisterScavenging (const MachineFunction &MF) const override
unsigned getCSRFirstUseCost (const MachineFunction &MF) const override
unsigned getCSRCostScale (const MachineFunction &MF) const override
const TargetRegisterClass * getRegClassToMinimizeDomainCrossings () const override

Detailed Description

Definition at line 26 of file X86RegisterInfo.h.

Constructor & Destructor Documentation

◆ X86RegisterInfo()

X86RegisterInfo::X86RegisterInfo ( const Triple & TT)
explicit

Definition at line 41 of file X86RegisterInfo.cpp.

References llvm::X86_MC::initLLVMToSEHAndCVRegMapping().

Member Function Documentation

◆ adjustStackMapLiveOutMask()

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

Definition at line 765 of file X86RegisterInfo.cpp.

References assert().

◆ canRealignStack()

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

Definition at line 813 of file X86RegisterInfo.cpp.

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

◆ constrainRegClassToNonRex2()

const TargetRegisterClass * X86RegisterInfo::constrainRegClassToNonRex2 ( const TargetRegisterClass * RC) const

Definition at line 1252 of file X86RegisterInfo.cpp.

References llvm::MCRegisterClass::getID().

Referenced by llvm::X86InstrInfo::getRegClass(), and suppressEGPRRegClass().

◆ eliminateFrameIndex() [1/2]

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

Definition at line 879 of file X86RegisterInfo.cpp.

References assert(), llvm::MachineOperand::ChangeToImmediate(), II, Imm, llvm::isInt(), MI, llvm::Offset, and Opc.

◆ eliminateFrameIndex() [2/2]

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

Definition at line 919 of file X86RegisterInfo.cpp.

References llvm::MachineInstrBuilder::addImm(), llvm::MachineInstrBuilder::addReg(), assert(), llvm::BuildMI(), llvm::MachineOperand::ChangeToImmediate(), contains(), DL, llvm::StackOffset::getFixed(), llvm::X86FrameLowering::getFrameIndexReference(), llvm::X86FrameLowering::getFrameIndexReferenceSP(), llvm::MachineFunction::getFrameInfo(), llvm::MachineFunction::getSubtarget(), llvm::X86FrameLowering::getWin64EHFrameIndexRef(), llvm::getX86SubSuperRegister(), II, Imm, llvm::X86FrameLowering::Is64Bit, llvm::MachineFrameInfo::isFixedObjectIndex(), llvm::isFuncletReturnInstr(), llvm::isInt(), MBB, MBBI, MI, llvm::Offset, Opc, TII, and tryOptimizeLEAtoMOV().

◆ eliminateFrameIndicesBackwards()

bool llvm::X86RegisterInfo::eliminateFrameIndicesBackwards ( ) const
inlineoverride

Process frame indices in forwards block order because X86InstrInfo::getSPAdjust relies on it when searching for the ADJCALLSTACKUP pseudo following a call.

TODO: Fix this and return true like all other targets.

Definition at line 146 of file X86RegisterInfo.h.

◆ 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 1041 of file X86RegisterInfo.cpp.

References llvm::LiveRegUnits::addLiveOuts(), llvm::LiveRegUnits::available(), llvm::MachineFunction::callsEHReturn(), llvm::MachineFunction::getRegInfo(), MBB, MBBI, MRI, and llvm::LiveRegUnits::stepBackward().

◆ getBaseRegister()

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

Definition at line 159 of file X86RegisterInfo.h.

Referenced by getReservedRegs().

◆ 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 212 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::CallingConv::GHC, llvm::Function::hasFnAttribute(), llvm::CallingConv::HiPE, llvm::CallingConv::Intel_OCL_BI, llvm::CallingConv::PreserveAll, llvm::CallingConv::PreserveMost, llvm::CallingConv::PreserveNone, Subtarget, 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 362 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 372 of file X86RegisterInfo.cpp.

References llvm::CallingConv::AnyReg, CC, llvm::CallingConv::CFGuard_Check, llvm::CallingConv::Cold, llvm::CallingConv::CXX_FAST_TLS, F, llvm::MachineFunction::getFunction(), llvm::MachineFunction::getSubtarget(), llvm::CallingConv::GHC, llvm::CallingConv::HiPE, llvm::CallingConv::Intel_OCL_BI, llvm::CallingConv::PreserveAll, llvm::CallingConv::PreserveMost, llvm::CallingConv::PreserveNone, Subtarget, llvm::CallingConv::SwiftTail, llvm::CallingConv::Win64, llvm::CallingConv::X86_64_SysV, llvm::CallingConv::X86_INTR, and llvm::CallingConv::X86_RegCall.

◆ 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 181 of file X86RegisterInfo.cpp.

◆ getCSRCostScale()

unsigned llvm::X86RegisterInfo::getCSRCostScale ( const MachineFunction & MF) const
inlineoverride

Definition at line 183 of file X86RegisterInfo.h.

◆ getCSRFirstUseCost()

unsigned X86RegisterInfo::getCSRFirstUseCost ( const MachineFunction & MF) const
override

Definition at line 1287 of file X86RegisterInfo.cpp.

References llvm::MachineFunction::getSubtarget().

◆ getDarwinTLSCallPreservedMask()

const uint32_t * X86RegisterInfo::getDarwinTLSCallPreservedMask ( ) const

Definition at line 505 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 164 of file X86RegisterInfo.h.

◆ getFrameRegister()

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

Definition at line 1088 of file X86RegisterInfo.cpp.

References llvm::TargetFrameLowering::hasFP().

Referenced by getPtrSizedFrameRegister().

◆ getIPRACSRegs()

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

getIPRACSRegs - This API can be removed when rbp is safe to optimized out when IPRA is on.

Definition at line 358 of file X86RegisterInfo.cpp.

◆ getLargestLegalSuperClass()

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

Definition at line 100 of file X86RegisterInfo.cpp.

References llvm::ArrayRef< T >::begin(), llvm::ArrayRef< T >::end(), llvm::MCRegisterClass::getID(), getRegClass(), llvm::MachineFunction::getSubtarget(), I, isNonRex2RegClass(), Subtarget, and llvm::MCRegisterClass::superclasses().

◆ 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 87 of file X86RegisterInfo.cpp.

References A(), and B().

◆ getNoPreservedMask()

const uint32_t * X86RegisterInfo::getNoPreservedMask ( ) const
override

Definition at line 501 of file X86RegisterInfo.cpp.

◆ getNumSupportedRegs()

unsigned X86RegisterInfo::getNumSupportedRegs ( const MachineFunction & MF) const
override

Return the number of registers for the function.

Definition at line 675 of file X86RegisterInfo.cpp.

References llvm::MachineFunction::getSubtarget().

◆ getPtrSizedFrameRegister()

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

Definition at line 1094 of file X86RegisterInfo.cpp.

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

◆ getPtrSizedStackRegister()

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

Definition at line 1103 of file X86RegisterInfo.cpp.

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

◆ getRegAllocationHints()

bool X86RegisterInfo::getRegAllocationHints ( Register VirtReg,
ArrayRef< MCPhysReg > Order,
SmallSetVector< MCPhysReg, 16 > & Hints,
const MachineFunction & MF,
const VirtRegMap * VRM,
const LiveRegMatrix * Matrix ) const
override

Definition at line 1156 of file X86RegisterInfo.cpp.

References assert(), llvm::SetVector< T, Vector, Set, N >::clear(), llvm::MCRegisterClass::contains(), llvm::SetVector< T, Vector, Set, N >::contains(), llvm::SmallSet< T, N, C >::count(), llvm::dbgs(), llvm::format_hex(), llvm::MCRegisterClass::getID(), llvm::X86::getNonNDVariant(), llvm::VirtRegMap::getPhys(), llvm::TargetRegisterInfo::getRegAllocationHints(), llvm::MachineFunction::getRegInfo(), llvm::MachineFunction::getSubtarget(), getTileShape(), llvm::SetVector< T, Vector, Set, N >::insert(), llvm::SmallSet< T, N, C >::insert(), llvm::Register::isPhysical(), LLVM_DEBUG, Matrix, MI, MRI, llvm::MCRegister::NoRegister, Register, and TRI.

◆ getRegClassToMinimizeDomainCrossings()

const TargetRegisterClass * llvm::X86RegisterInfo::getRegClassToMinimizeDomainCrossings ( ) const
inlineoverride

Definition at line 188 of file X86RegisterInfo.h.

◆ getRegPressureLimit()

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

Definition at line 192 of file X86RegisterInfo.cpp.

References llvm::MCRegisterClass::getID(), and llvm::TargetFrameLowering::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 509 of file X86RegisterInfo.cpp.

References assert(), llvm::MachineFunction::exposesReturnsTwice(), llvm::MachineFunction::framePointerIsReserved(), getBaseRegister(), llvm::X86MachineFunctionInfo::getBPClobberedByInvoke(), llvm::Function::getCallingConv(), llvm::MachineFunction::getContext(), llvm::X86MachineFunctionInfo::getFPClobberedByInvoke(), llvm::MachineFunction::getFunction(), llvm::MachineFunction::getInfo(), llvm::MachineFunction::getName(), llvm::MachineFunction::getRegInfo(), llvm::MachineFunction::getSubtarget(), llvm::getX86SubSuperRegister(), llvm::CallingConv::GRAAL, llvm::X86Subtarget::hasAVX512(), hasBasePointer(), llvm::TargetFrameLowering::hasFP(), llvm::X86Subtarget::isLFI(), llvm::MCRegAliasIterator::isValid(), llvm::MCContext::reportError(), llvm::MCContext::reportWarning(), llvm::Reserved, llvm::MachineRegisterInfo::reservedRegsFrozen(), and llvm::MachineFunction::size().

◆ getSlotSize()

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

Definition at line 166 of file X86RegisterInfo.h.

Referenced by llvm::X86AsmPrinter::emitInstruction(), and llvm::X86MachineFunctionInfo::setRestoreBasePointer().

◆ getStackRegister()

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

Definition at line 158 of file X86RegisterInfo.h.

Referenced by getPtrSizedStackRegister().

◆ getSubClassWithSubReg()

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

Definition at line 75 of file X86RegisterInfo.cpp.

◆ hasBasePointer()

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

Definition at line 789 of file X86RegisterInfo.cpp.

References CantUseSP(), llvm::X86Subtarget::getCLOpts(), llvm::MachineFunction::getFrameInfo(), llvm::MachineFunction::getInfo(), llvm::X86MachineFunctionInfo::getStackPtrSaveMI(), llvm::MachineFunction::getSubtarget(), and llvm::X86MachineFunctionInfo::hasPreallocatedCall().

Referenced by 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 705 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 744 of file X86RegisterInfo.cpp.

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

◆ isNonRex2RegClass()

bool X86RegisterInfo::isNonRex2RegClass ( const TargetRegisterClass * RC) const

Definition at line 1272 of file X86RegisterInfo.cpp.

References llvm::MCRegisterClass::getID().

Referenced by getLargestLegalSuperClass().

◆ isTileRegisterClass()

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

Return true if it is tile register class.

Definition at line 761 of file X86RegisterInfo.cpp.

References llvm::MCRegisterClass::getID().

◆ requiresRegisterScavenging()

bool llvm::X86RegisterInfo::requiresRegisterScavenging ( const MachineFunction & MF) const
inlineoverride

Definition at line 178 of file X86RegisterInfo.h.

◆ shouldRealignStack()

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

Definition at line 832 of file X86RegisterInfo.cpp.

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

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