This class provides the information for the target register banks. More...

#include "Target/ARM/ARMRegisterBankInfo.h"

Inheritance diagram for llvm::ARMRegisterBankInfo:

Public Member Functions
	ARMRegisterBankInfo (const TargetRegisterInfo &TRI)

const InstructionMapping &	getInstrMapping (const MachineInstr &MI) const override
	Get the mapping of the different operands of `MI` on the register bank.

Public Member Functions inherited from llvm::RegisterBankInfo
const RegisterBank *	getRegBankFromConstraints (const MachineInstr &MI, unsigned OpIdx, const TargetInstrInfo &TII, const MachineRegisterInfo &MRI) const
	Get the register bank for the `OpIdx-th` operand of `MI` form the encoding constraints, if any.

virtual void	applyMappingImpl (MachineIRBuilder &Builder, const OperandsMapper &OpdMapper) const
	See applyMapping.

virtual	~RegisterBankInfo ()=default

const RegisterBank &	getRegBank (unsigned ID) const
	Get the register bank identified by `ID`.

unsigned	getMaximumSize (unsigned RegBankID) const
	Get the maximum size in bits that fits in the given register bank.

const RegisterBank *	getRegBank (Register Reg, const MachineRegisterInfo &MRI, const TargetRegisterInfo &TRI) const
	Get the register bank of `Reg`.

unsigned	getNumRegBanks () const
	Get the total number of register banks.

virtual bool	isDivergentRegBank (const RegisterBank *RB) const
	Returns true if the register bank is considered divergent.

virtual const RegisterBank &	getRegBankFromRegClass (const TargetRegisterClass &RC, LLT Ty) const
	Get a register bank that covers `RC`.

virtual unsigned	copyCost (const RegisterBank &A, const RegisterBank &B, TypeSize Size) const
	Get the cost of a copy from `B` to `A`, or put differently, get the cost of A = COPY B.

bool	cannotCopy (const RegisterBank &Dst, const RegisterBank &Src, TypeSize Size) const

virtual unsigned	getBreakDownCost (const ValueMapping &ValMapping, const RegisterBank *CurBank=nullptr) const
	Get the cost of using `ValMapping` to decompose a register.

virtual const InstructionMapping &	getInstrMapping (const MachineInstr &MI) const
	Get the mapping of the different operands of `MI` on the register bank.

virtual InstructionMappings	getInstrAlternativeMappings (const MachineInstr &MI) const
	Get the alternative mappings for `MI`.

InstructionMappings	getInstrPossibleMappings (const MachineInstr &MI) const
	Get the possible mapping for `MI`.

void	applyMapping (MachineIRBuilder &Builder, const OperandsMapper &OpdMapper) const
	Apply `OpdMapper.getInstrMapping()` to `OpdMapper.getMI()`.

TypeSize	getSizeInBits (Register Reg, const MachineRegisterInfo &MRI, const TargetRegisterInfo &TRI) const
	Get the size in bits of `Reg`.

bool	verify (const TargetRegisterInfo &TRI) const
	Check that information hold by this instance make sense for the given `TRI`.

const InstructionMapping &	getInstructionMapping (unsigned ID, unsigned Cost, const ValueMapping *OperandsMapping, unsigned NumOperands) const
	Method to get a uniquely generated InstructionMapping.

const InstructionMapping &	getInvalidInstructionMapping () const
	Method to get a uniquely generated invalid InstructionMapping.

Additional Inherited Members
Public Types inherited from llvm::RegisterBankInfo
using	InstructionMappings = SmallVector< const InstructionMapping *, 4 >
	Convenient type to represent the alternatives for mapping an instruction.

Static Public Member Functions inherited from llvm::RegisterBankInfo
static void	applyDefaultMapping (const OperandsMapper &OpdMapper)
	Helper method to apply something that is like the default mapping.

static const TargetRegisterClass *	constrainGenericRegister (Register Reg, const TargetRegisterClass &RC, MachineRegisterInfo &MRI)
	Constrain the (possibly generic) virtual register `Reg` to `RC`.

Static Public Attributes inherited from llvm::RegisterBankInfo
static const unsigned	DefaultMappingID = UINT_MAX
	Identifier used when the related instruction mapping instance is generated by target independent code.

static const unsigned	InvalidMappingID = UINT_MAX - 1
	Identifier used when the related instruction mapping instance is generated by the default constructor.

Protected Member Functions inherited from llvm::RegisterBankInfo
	RegisterBankInfo (const RegisterBank *RegBanks, unsigned NumRegBanks, const unsigned Sizes, unsigned HwMode)
	Create a RegisterBankInfo that can accommodate up to `NumRegBanks` RegisterBank instances.

	RegisterBankInfo ()
	This constructor is meaningless.

const RegisterBank &	getRegBank (unsigned ID)
	Get the register bank identified by `ID`.

const TargetRegisterClass *	getMinimalPhysRegClass (Register Reg, const TargetRegisterInfo &TRI) const
	Get the MinimalPhysRegClass for Reg.

const InstructionMapping &	getInstrMappingImpl (const MachineInstr &MI) const
	Try to get the mapping of `MI`.

const PartialMapping &	getPartialMapping (unsigned StartIdx, unsigned Length, const RegisterBank &RegBank) const
	Get the uniquely generated PartialMapping for the given arguments.

const ValueMapping &	getValueMapping (unsigned StartIdx, unsigned Length, const RegisterBank &RegBank) const
	The most common ValueMapping consists of a single PartialMapping.

const ValueMapping &	getValueMapping (const PartialMapping *BreakDown, unsigned NumBreakDowns) const
	Get the ValueMapping for the given arguments.

template<typename Iterator >
const ValueMapping *	getOperandsMapping (Iterator Begin, Iterator End) const
	Get the uniquely generated array of ValueMapping for the elements of between `Begin` and `End`.

const ValueMapping *	getOperandsMapping (const SmallVectorImpl< const ValueMapping * > &OpdsMapping) const
	Get the uniquely generated array of ValueMapping for the elements of `OpdsMapping`.

const ValueMapping *	getOperandsMapping (std::initializer_list< const ValueMapping * > OpdsMapping) const
	Get the uniquely generated array of ValueMapping for the given arguments.

Protected Attributes inherited from llvm::RegisterBankInfo
const RegisterBank **	RegBanks
	Hold the set of supported register banks.

unsigned	NumRegBanks
	Total number of register banks.

const unsigned *	Sizes
	Hold the sizes of the register banks for all HwModes.

unsigned	HwMode
	Current HwMode for the target.

DenseMap< hash_code, std::unique_ptr< const PartialMapping > >	MapOfPartialMappings
	Keep dynamically allocated PartialMapping in a separate map.

DenseMap< hash_code, std::unique_ptr< const ValueMapping > >	MapOfValueMappings
	Keep dynamically allocated ValueMapping in a separate map.

DenseMap< hash_code, std::unique_ptr< ValueMapping[]> >	MapOfOperandsMappings
	Keep dynamically allocated array of ValueMapping in a separate map.

DenseMap< hash_code, std::unique_ptr< const InstructionMapping > >	MapOfInstructionMappings
	Keep dynamically allocated InstructionMapping in a separate map.

DenseMap< unsigned, const TargetRegisterClass * >	PhysRegMinimalRCs
	Getting the minimal register class of a physreg is expensive.

Detailed Description

This class provides the information for the target register banks.

Definition at line 31 of file ARMRegisterBankInfo.h.

Constructor & Destructor Documentation

◆ ARMRegisterBankInfo()

ARMRegisterBankInfo::ARMRegisterBankInfo ( const TargetRegisterInfo & TRI )

Definition at line 133 of file ARMRegisterBankInfo.cpp.

References assert(), llvm::call_once(), llvm::ARM::checkPartialMappings(), llvm::ARM::checkValueMappings(), llvm::RegisterBank::covers(), llvm::RegisterBank::getID(), llvm::RegisterBankInfo::getMaximumSize(), llvm::RegisterBankInfo::getRegBank(), and TRI.

Member Function Documentation

◆ getInstrMapping()

const RegisterBankInfo::InstructionMapping & ARMRegisterBankInfo::getInstrMapping ( const MachineInstr & MI ) const

overridevirtual

Get the mapping of the different operands of MI on the register bank.

This mapping should be the direct translation of MI. In other words, when MI is mapped with the returned mapping, only the register banks of the operands of MI need to be updated. In particular, neither the opcode nor the type of MI needs to be updated for this direct mapping.

The target independent implementation gives a mapping based on the register classes for the target specific opcode. It uses the ID RegisterBankInfo::DefaultMappingID for that mapping. Make sure you do not use that ID for the alternative mapping for MI. See getInstrAlternativeMappings for the alternative mappings.

For instance, if MI is a vector add, the mapping should not be a scalarization of the add.

Postcondition: returnedVal.verify(MI).

Note: If returnedVal does not verify MI, this would probably mean that the target does not support that instruction.

Reimplemented from llvm::RegisterBankInfo.

Definition at line 174 of file ARMRegisterBankInfo.cpp.

References assert(), llvm::RegisterBankInfo::DefaultMappingID, llvm::ARM::DPR3OpsIdx, llvm::RegisterBankInfo::getInstrMappingImpl(), llvm::RegisterBankInfo::getInstructionMapping(), llvm::RegisterBankInfo::getInvalidInstructionMapping(), llvm::RegisterBankInfo::getOperandsMapping(), llvm::MachineOperand::getReg(), llvm::MachineFunction::getRegInfo(), llvm::LLT::getSizeInBits(), llvm::MachineFunction::getSubtarget(), llvm::ARM::GPR3OpsIdx, llvm::ARMSubtarget::hasVFP2Base(), llvm::isPreISelGenericOpcode(), llvm::MachineOperand::isReg(), llvm::RegisterBankInfo::InstructionMapping::isValid(), MI, MRI, Size, llvm::ARM::SPR3OpsIdx, and llvm::ARM::ValueMappings.

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

lib/Target/ARM/ARMRegisterBankInfo.h
lib/Target/ARM/ARMRegisterBankInfo.cpp

Public Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ ARMRegisterBankInfo()

Member Function Documentation

◆ getInstrMapping()