Helper struct that represents how a value is partially mapped into a register. More...

#include "llvm/CodeGen/RegisterBankInfo.h"

Public Member Functions
	PartialMapping ()=default

constexpr	PartialMapping (unsigned StartIdx, unsigned Length, const RegisterBank &RegBank)
	Provide a shortcut for quickly building PartialMapping.

unsigned	getHighBitIdx () const

void	dump () const
	Print this partial mapping on dbgs() stream.

void	print (raw_ostream &OS) const
	Print this partial mapping on `OS`;.

bool	verify (const RegisterBankInfo &RBI) const
	Check that the Mask is compatible with the RegBank.

Public Attributes
unsigned	StartIdx
	Number of bits at which this partial mapping starts in the original value.

unsigned	Length
	Length of this mapping in bits.

const RegisterBank *	RegBank
	Register bank where the partial value lives.

Detailed Description

Helper struct that represents how a value is partially mapped into a register.

The StartIdx and Length represent what region of the orginal value this partial mapping covers. This can be represented as a Mask of contiguous bit starting at StartIdx bit and spanning Length bits. StartIdx is the number of bits from the less significant bits.

Definition at line 49 of file RegisterBankInfo.h.

Constructor & Destructor Documentation

◆ PartialMapping() [1/2]

llvm::RegisterBankInfo::PartialMapping::PartialMapping ( )

default

◆ PartialMapping() [2/2]

constexpr llvm::RegisterBankInfo::PartialMapping::PartialMapping	(	unsigned	StartIdx,
		unsigned	Length,
		const RegisterBank &	RegBank
	)

inlineconstexpr

Provide a shortcut for quickly building PartialMapping.

Definition at line 66 of file RegisterBankInfo.h.

Member Function Documentation

◆ dump()

LLVM_DUMP_METHOD void RegisterBankInfo::PartialMapping::dump ( ) const

Print this partial mapping on dbgs() stream.

Definition at line 519 of file RegisterBankInfo.cpp.

References llvm::dbgs(), and print().

◆ getHighBitIdx()

unsigned llvm::RegisterBankInfo::PartialMapping::getHighBitIdx ( ) const

inline

Returns: the index of in the original value of the most significant bit that this partial mapping covers.

Definition at line 72 of file RegisterBankInfo.h.

References Length, and StartIdx.

Referenced by llvm::RegisterBankInfo::ValueMapping::verify().

◆ print()

void RegisterBankInfo::PartialMapping::print ( raw_ostream & OS ) const

Print this partial mapping on OS;.

Definition at line 536 of file RegisterBankInfo.cpp.

References OS.

Referenced by dump(), and llvm::operator<<().

◆ verify()

bool RegisterBankInfo::PartialMapping::verify ( const RegisterBankInfo & RBI ) const

Check that the Mask is compatible with the RegBank.

Indeed, if the RegBank cannot accomadate the "active bits" of the mask, there is no way this mapping is valid.

Note: This method does not check anything when assertions are disabled.

Returns: True is the check was successful.

Definition at line 525 of file RegisterBankInfo.cpp.

References assert(), llvm::RegisterBankInfo::getMaximumSize(), and llvm::Length.

Referenced by llvm::RegisterBankInfo::ValueMapping::verify().

Member Data Documentation

◆ Length

unsigned llvm::RegisterBankInfo::PartialMapping::Length

Length of this mapping in bits.

This is how many bits this partial mapping covers in the original value: from StartIdx to StartIdx + Length -1.

Definition at line 58 of file RegisterBankInfo.h.

Referenced by llvm::ARM::checkPartMapping(), llvm::RegisterBankInfo::OperandsMapper::createVRegs(), llvm::AMDGPURegisterBankInfo::getBreakDownCost(), getHighBitIdx(), llvm::hash_value(), and llvm::RegBankSelect::repairReg().

◆ RegBank

const RegisterBank* llvm::RegisterBankInfo::PartialMapping::RegBank

Register bank where the partial value lives.

Definition at line 61 of file RegisterBankInfo.h.

Referenced by llvm::RegBankSelect::applyMapping(), llvm::AMDGPURegisterBankInfo::applyMappingBFE(), llvm::AMDGPURegisterBankInfo::applyMappingImpl(), llvm::AMDGPURegisterBankInfo::applyMappingLoad(), llvm::AMDGPURegisterBankInfo::applyMappingSBufferLoad(), llvm::RegBankSelect::assignmentMatch(), llvm::ARM::checkPartMapping(), llvm::RegisterBankInfo::OperandsMapper::createVRegs(), llvm::AMDGPURegisterBankInfo::getBreakDownCost(), llvm::RegBankSelect::getRepairCost(), and llvm::hash_value().

◆ StartIdx

unsigned llvm::RegisterBankInfo::PartialMapping::StartIdx

Number of bits at which this partial mapping starts in the original value.

The bits are counted from less significant bits to most significant bits.

Definition at line 53 of file RegisterBankInfo.h.

Referenced by llvm::ARM::checkPartMapping(), llvm::AMDGPURegisterBankInfo::getBreakDownCost(), getHighBitIdx(), llvm::hash_value(), and llvm::RegisterBankInfo::ValueMapping::verify().

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

include/llvm/CodeGen/RegisterBankInfo.h
lib/CodeGen/RegisterBankInfo.cpp

Public Member Functions

Public Attributes