LLVM 22.0.0git
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 * getPointerRegClass (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.
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, SmallVectorImpl< MCPhysReg > &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

Detailed Description

Definition at line 25 of file X86RegisterInfo.h.

Constructor & Destructor Documentation

◆ X86RegisterInfo()

X86RegisterInfo::X86RegisterInfo ( const Triple & TT)
explicit

Definition at line 55 of file X86RegisterInfo.cpp.

References llvm::X86_MC::initLLVMToSEHAndCVRegMapping().

Member Function Documentation

◆ adjustStackMapLiveOutMask()

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

Definition at line 701 of file X86RegisterInfo.cpp.

References assert().

◆ canRealignStack()

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

Definition at line 749 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 1236 of file X86RegisterInfo.cpp.

References llvm::TargetRegisterClass::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 815 of file X86RegisterInfo.cpp.

References assert(), llvm::MachineOperand::ChangeToImmediate(), II, 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 855 of file X86RegisterInfo.cpp.

References llvm::MachineInstrBuilder::addImm(), assert(), llvm::RegScavenger::backward(), llvm::BuildMI(), llvm::MachineOperand::ChangeToImmediate(), contains(), DL, llvm::RegScavenger::enterBasicBlockEnd(), llvm::StackOffset::getFixed(), llvm::X86FrameLowering::getFrameIndexReference(), llvm::X86FrameLowering::getFrameIndexReferenceSP(), llvm::MachineFunction::getFrameInfo(), llvm::MachineFunction::getSubtarget(), llvm::X86FrameLowering::getWin64EHFrameIndexRef(), llvm::getX86SubSuperRegister(), II, llvm::X86FrameLowering::Is64Bit, llvm::MachineFrameInfo::isFixedObjectIndex(), llvm::isFuncletReturnInstr(), llvm::isInt(), MBB, MBBI, MI, llvm::Offset, Opc, llvm::RegScavenger::scavengeRegisterBackwards(), llvm::RegScavenger::setRegUsed(), 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 150 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 965 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 163 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 239 of file X86RegisterInfo.cpp.

References llvm::CallingConv::AnyReg, assert(), llvm::MachineFunction::callsEHReturn(), 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::CallingConv::PreserveNone, 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 373 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 383 of file X86RegisterInfo.cpp.

References llvm::CallingConv::AnyReg, assert(), 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::CallingConv::PreserveNone, llvm::X86TargetLowering::supportSwiftError(), 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 208 of file X86RegisterInfo.cpp.

◆ getDarwinTLSCallPreservedMask()

const uint32_t * X86RegisterInfo::getDarwinTLSCallPreservedMask ( ) const

Definition at line 494 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 168 of file X86RegisterInfo.h.

◆ getFrameRegister()

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

Definition at line 1012 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 369 of file X86RegisterInfo.cpp.

◆ getLargestLegalSuperClass()

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

Definition at line 114 of file X86RegisterInfo.cpp.

References llvm::ArrayRef< T >::begin(), llvm::ArrayRef< T >::end(), getRegClass(), llvm::MachineFunction::getSubtarget(), llvm::X86Subtarget::hasAVX512(), I, isNonRex2RegClass(), llvm::TargetRegisterClass::superclasses(), and X86EnableAPXForRelocation.

◆ 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 101 of file X86RegisterInfo.cpp.

References A(), and B().

◆ getNoPreservedMask()

const uint32_t * X86RegisterInfo::getNoPreservedMask ( ) const
override

Definition at line 490 of file X86RegisterInfo.cpp.

◆ getNumSupportedRegs()

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

Return the number of registers for the function.

Definition at line 610 of file X86RegisterInfo.cpp.

References llvm::MachineFunction::getSubtarget().

◆ getPointerRegClass()

const TargetRegisterClass * X86RegisterInfo::getPointerRegClass ( unsigned Kind = 0) const
override

getPointerRegClass - Returns a TargetRegisterClass used for pointer values.

Definition at line 196 of file X86RegisterInfo.cpp.

References assert().

◆ getPtrSizedFrameRegister()

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

Definition at line 1018 of file X86RegisterInfo.cpp.

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

◆ getPtrSizedStackRegister()

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

Definition at line 1027 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 1138 of file X86RegisterInfo.cpp.

References assert(), canHintShape(), llvm::SmallVectorImpl< T >::clear(), llvm::TargetRegisterClass::contains(), llvm::SmallSet< T, N, C >::count(), llvm::dbgs(), DisableRegAllocNDDHints, llvm::format_hex(), llvm::from_range, llvm::TargetRegisterClass::getID(), llvm::X86::getNonNDVariant(), llvm::VirtRegMap::getPhys(), llvm::TargetRegisterInfo::getRegAllocationHints(), llvm::MachineFunction::getRegInfo(), llvm::MachineFunction::getSubtarget(), getTileShape(), llvm::SmallSet< T, N, C >::insert(), llvm::is_contained(), llvm::Register::isPhysical(), LLVM_DEBUG, Matrix, MI, MRI, llvm::MCRegister::NoRegister, OpIdx, llvm::SmallVectorTemplateBase< T, bool >::push_back(), Register, and TRI.

◆ getRegPressureLimit()

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

Definition at line 219 of file X86RegisterInfo.cpp.

References llvm::TargetRegisterClass::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 498 of file X86RegisterInfo.cpp.

References assert(), llvm::TargetOptions::FramePointerIsReserved(), getBaseRegister(), llvm::X86MachineFunctionInfo::getBPClobberedByInvoke(), llvm::Function::getCallingConv(), llvm::MachineFunction::getContext(), llvm::X86MachineFunctionInfo::getFPClobberedByInvoke(), llvm::MachineFunction::getFunction(), llvm::MachineFunction::getInfo(), llvm::MachineFunction::getSubtarget(), llvm::MachineFunction::getTarget(), llvm::getX86SubSuperRegister(), llvm::CallingConv::GRAAL, llvm::X86Subtarget::hasAVX512(), hasBasePointer(), llvm::TargetFrameLowering::hasFP(), llvm::MCRegAliasIterator::isValid(), llvm::TargetMachine::Options, llvm::MCContext::reportError(), llvm::Reserved, and SubReg.

◆ getSlotSize()

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

Definition at line 170 of file X86RegisterInfo.h.

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

◆ getStackRegister()

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

Definition at line 162 of file X86RegisterInfo.h.

Referenced by getPtrSizedStackRegister().

◆ getSubClassWithSubReg()

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

Definition at line 89 of file X86RegisterInfo.cpp.

◆ hasBasePointer()

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

Definition at line 725 of file X86RegisterInfo.cpp.

References CantUseSP(), EnableBasePointer, llvm::MachineFunction::getFrameInfo(), llvm::MachineFunction::getInfo(), llvm::X86MachineFunctionInfo::getStackPtrSaveMI(), 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 640 of file X86RegisterInfo.cpp.

References llvm::any_of(), 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 679 of file X86RegisterInfo.cpp.

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

◆ isNonRex2RegClass()

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

Definition at line 1256 of file X86RegisterInfo.cpp.

References llvm::TargetRegisterClass::getID().

Referenced by getLargestLegalSuperClass().

◆ isTileRegisterClass()

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

Return true if it is tile register class.

Definition at line 696 of file X86RegisterInfo.cpp.

References llvm::TargetRegisterClass::getID().

◆ requiresRegisterScavenging()

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

Definition at line 182 of file X86RegisterInfo.h.

◆ shouldRealignStack()

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

Definition at line 768 of file X86RegisterInfo.cpp.

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

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