LLVM 20.0.0git
Public Member Functions | List of all members
llvm::AArch64RegisterBankInfo Class Referencefinal

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

#include "Target/AArch64/GISel/AArch64RegisterBankInfo.h"

Inheritance diagram for llvm::AArch64RegisterBankInfo:
Inheritance graph
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Public Member Functions

 AArch64RegisterBankInfo (const TargetRegisterInfo &TRI)
 
unsigned copyCost (const RegisterBank &A, const RegisterBank &B, TypeSize Size) const override
 Get the cost of a copy from B to A, or put differently, get the cost of A = COPY B.
 
const RegisterBank & getRegBankFromRegClass (const TargetRegisterClass &RC, LLT Ty) const override
 Get a register bank that covers RC.
 
InstructionMappings getInstrAlternativeMappings (const MachineInstr &MI) const override
 Get the alternative mappings for MI.
 
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 Types inherited from llvm::AArch64GenRegisterBankInfo
enum  PartialMappingIdx {
  PMI_None = -1 , PMI_FPR16 = 1 , PMI_FPR32 , PMI_FPR64 ,
  PMI_FPR128 , PMI_FPR256 , PMI_FPR512 , PMI_GPR32 ,
  PMI_GPR64 , PMI_GPR128 , PMI_FirstGPR = PMI_GPR32 , PMI_LastGPR = PMI_GPR128 ,
  PMI_FirstFPR = PMI_FPR16 , PMI_LastFPR = PMI_FPR512 , PMI_Min = PMI_FirstFPR
}
 
enum  ValueMappingIdx {
  InvalidIdx = 0 , First3OpsIdx = 1 , Last3OpsIdx = 25 , DistanceBetweenRegBanks = 3 ,
  FirstCrossRegCpyIdx = 28 , LastCrossRegCpyIdx = 42 , DistanceBetweenCrossRegCpy = 2 , FPExt16To32Idx = 44 ,
  FPExt16To64Idx = 46 , FPExt32To64Idx = 48 , FPExt64To128Idx = 50 , Shift64Imm = 52
}
 
- 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.
 
- Static Protected Member Functions inherited from llvm::AArch64GenRegisterBankInfo
static bool checkPartialMap (unsigned Idx, unsigned ValStartIdx, unsigned ValLength, const RegisterBank &RB)
 
static bool checkValueMapImpl (unsigned Idx, unsigned FirstInBank, unsigned Size, unsigned Offset)
 
static bool checkPartialMappingIdx (PartialMappingIdx FirstAlias, PartialMappingIdx LastAlias, ArrayRef< PartialMappingIdx > Order)
 
static unsigned getRegBankBaseIdxOffset (unsigned RBIdx, TypeSize Size)
 
static const RegisterBankInfo::ValueMapping * getValueMapping (PartialMappingIdx RBIdx, TypeSize Size)
 Get the pointer to the ValueMapping representing the RegisterBank at RBIdx with a size of Size.
 
static const RegisterBankInfo::ValueMapping * getCopyMapping (unsigned DstBankID, unsigned SrcBankID, TypeSize Size)
 Get the pointer to the ValueMapping of the operands of a copy instruction from the SrcBankID register bank to the DstBankID register bank with a size of Size.
 
static const RegisterBankInfo::ValueMapping * getFPExtMapping (unsigned DstSize, unsigned SrcSize)
 Get the instruction mapping for G_FPEXT.
 
- 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.
 
- Static Protected Attributes inherited from llvm::AArch64GenRegisterBankInfo
static const RegisterBankInfo::PartialMapping PartMappings []
 
static const RegisterBankInfo::ValueMapping ValMappings []
 
static const PartialMappingIdx BankIDToCopyMapIdx []
 

Detailed Description

This class provides the information for the target register banks.

Definition at line 105 of file AArch64RegisterBankInfo.h.

Constructor & Destructor Documentation

◆ AArch64RegisterBankInfo()

AArch64RegisterBankInfo::AArch64RegisterBankInfo ( const TargetRegisterInfo &  TRI)

Definition at line 47 of file AArch64RegisterBankInfo.cpp.

References assert(), llvm::call_once(), CHECK_PARTIALMAP, CHECK_VALUEMAP, CHECK_VALUEMAP_3OPS, CHECK_VALUEMAP_CROSSREGCPY, CHECK_VALUEMAP_FPEXT, llvm::AArch64GenRegisterBankInfo::checkPartialMappingIdx(), llvm::RegisterBank::covers(), FPR, llvm::RegisterBank::getID(), llvm::RegisterBankInfo::getMaximumSize(), llvm::RegisterBankInfo::getRegBank(), llvm::AArch64GenRegisterBankInfo::PMI_FirstFPR, llvm::AArch64GenRegisterBankInfo::PMI_FirstGPR, llvm::AArch64GenRegisterBankInfo::PMI_FPR128, llvm::AArch64GenRegisterBankInfo::PMI_FPR16, llvm::AArch64GenRegisterBankInfo::PMI_FPR256, llvm::AArch64GenRegisterBankInfo::PMI_FPR32, llvm::AArch64GenRegisterBankInfo::PMI_FPR512, llvm::AArch64GenRegisterBankInfo::PMI_FPR64, llvm::AArch64GenRegisterBankInfo::PMI_GPR128, llvm::AArch64GenRegisterBankInfo::PMI_GPR32, llvm::AArch64GenRegisterBankInfo::PMI_GPR64, llvm::AArch64GenRegisterBankInfo::PMI_LastFPR, llvm::AArch64GenRegisterBankInfo::PMI_LastGPR, TRI, and verify.

Member Function Documentation

◆ copyCost()

unsigned AArch64RegisterBankInfo::copyCost ( const RegisterBank &  A,
const RegisterBank &  B,
TypeSize  Size 
) const
overridevirtual

Get the cost of a copy from B to A, or put differently, get the cost of A = COPY B.

Since register banks may cover different size, Size specifies what will be the size in bits that will be copied around.

Note
Since this is a copy, both registers have the same size.

Reimplemented from llvm::RegisterBankInfo.

Definition at line 221 of file AArch64RegisterBankInfo.cpp.

References A, B, llvm::RegisterBankInfo::copyCost(), and Size.

Referenced by getInstrAlternativeMappings(), and getInstrMapping().

◆ getInstrAlternativeMappings()

RegisterBankInfo::InstructionMappings AArch64RegisterBankInfo::getInstrAlternativeMappings ( const MachineInstr &  MI) const
overridevirtual

Get the alternative mappings for MI.

Alternative in the sense different from getInstrMapping.

Reimplemented from llvm::RegisterBankInfo.

Definition at line 254 of file AArch64RegisterBankInfo.cpp.

References copyCost(), llvm::AArch64GenRegisterBankInfo::getCopyMapping(), llvm::TypeSize::getFixed(), llvm::RegisterBankInfo::getInstrAlternativeMappings(), llvm::RegisterBankInfo::getInstructionMapping(), llvm::RegisterBankInfo::getOperandsMapping(), llvm::MachineFunction::getRegInfo(), llvm::TargetSubtargetInfo::getRegisterInfo(), llvm::RegisterBankInfo::getSizeInBits(), llvm::MachineFunction::getSubtarget(), llvm::AArch64GenRegisterBankInfo::getValueMapping(), MI, MRI, llvm::AArch64GenRegisterBankInfo::PMI_FirstFPR, llvm::AArch64GenRegisterBankInfo::PMI_FirstGPR, llvm::SmallVectorTemplateBase< T, bool >::push_back(), Size, and TRI.

◆ getInstrMapping()

const RegisterBankInfo::InstructionMapping & AArch64RegisterBankInfo::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 624 of file AArch64RegisterBankInfo.cpp.

References llvm::all_of(), llvm::any_of(), assert(), copyCost(), CustomMappingID, llvm::RegisterBankInfo::DefaultMappingID, DefMI, llvm::AArch64GenRegisterBankInfo::getCopyMapping(), llvm::TypeSize::getFixed(), llvm::AArch64GenRegisterBankInfo::getFPExtMapping(), llvm::RegisterBank::getID(), llvm::RegisterBankInfo::getInstrMappingImpl(), llvm::RegisterBankInfo::getInstructionMapping(), llvm::RegisterBankInfo::getInvalidInstructionMapping(), llvm::details::FixedOrScalableQuantity< LeafTy, ValueTy >::getKnownMinValue(), llvm::MachineInstr::getOpcode(), llvm::RegisterBankInfo::getOperandsMapping(), llvm::RegisterBankInfo::getRegBank(), llvm::MachineFunction::getRegInfo(), llvm::TargetSubtargetInfo::getRegisterInfo(), llvm::LLT::getSizeInBits(), llvm::RegisterBankInfo::getSizeInBits(), llvm::MachineFunction::getSubtarget(), llvm::AArch64GenRegisterBankInfo::getValueMapping(), Idx, llvm::Register::isPhysical(), llvm::isPreISelGenericFloatingPointOpcode(), llvm::isPreISelGenericOpcode(), llvm::RegisterBankInfo::InstructionMapping::isValid(), llvm::LLT::isValid(), llvm::LLT::isVector(), MI, MRI, llvm::AArch64GenRegisterBankInfo::PartMappings, llvm::AArch64GenRegisterBankInfo::PMI_FirstFPR, llvm::AArch64GenRegisterBankInfo::PMI_FirstGPR, llvm::AArch64GenRegisterBankInfo::PMI_None, llvm::LLT::scalar(), llvm::AArch64GenRegisterBankInfo::Shift64Imm, Size, TRI, UseMI, and llvm::AArch64GenRegisterBankInfo::ValMappings.

◆ getRegBankFromRegClass()

const RegisterBank & AArch64RegisterBankInfo::getRegBankFromRegClass ( const TargetRegisterClass &  RC,
LLT  Ty 
) const
overridevirtual

Get a register bank that covers RC.

Precondition
RC is a user-defined register class (as opposed as one generated by TableGen).
Note
The mapping RC -> RegBank could be built while adding the coverage for the register banks. However, we do not do it, because, at least for now, we only need this information for register classes that are used in the description of instruction. In other words, there are just a handful of them and we do not want to waste space.
Todo:
This should be TableGen'ed.

Reimplemented from llvm::RegisterBankInfo.

Definition at line 243 of file AArch64RegisterBankInfo.cpp.

References llvm::TargetRegisterClass::getID(), llvm::RegisterBankInfo::getRegBank(), and llvm::RegisterBankInfo::getRegBankFromRegClass().

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