#include "llvm/CodeGen/GlobalISel/LegacyLegalizerInfo.h"

Public Types
using	SizeAndAction = std::pair< uint16_t, LegacyLegalizeActions::LegacyLegalizeAction >

using	SizeAndActionsVec = std::vector< SizeAndAction >

using	SizeChangeStrategy = std::function< SizeAndActionsVec(const SizeAndActionsVec &v)>

Public Member Functions
	LegacyLegalizerInfo ()

void	computeTables ()
	Compute any ancillary tables needed to quickly decide how an operation should be handled.

void	setAction (const InstrAspect &Aspect, LegacyLegalizeActions::LegacyLegalizeAction Action)
	More friendly way to set an action for common types that have an LLT representation.

void	setLegalizeScalarToDifferentSizeStrategy (const unsigned Opcode, const unsigned TypeIdx, SizeChangeStrategy S)
	The setAction calls record the non-size-changing legalization actions to take on specificly-sized types.

void	setLegalizeVectorElementToDifferentSizeStrategy (const unsigned Opcode, const unsigned TypeIdx, SizeChangeStrategy S)
	See also setLegalizeScalarToDifferentSizeStrategy.

LegacyLegalizeActionStep	getAction (const LegalityQuery &Query) const

unsigned	getOpcodeIdxForOpcode (unsigned Opcode) const

Static Public Member Functions
static bool	needsLegalizingToDifferentSize (const LegacyLegalizeActions::LegacyLegalizeAction Action)

static SizeAndActionsVec	unsupportedForDifferentSizes (const SizeAndActionsVec &v)
	A SizeChangeStrategy for the common case where legalization for a particular operation consists of only supporting a specific set of type sizes.

static SizeAndActionsVec	widenToLargerTypesAndNarrowToLargest (const SizeAndActionsVec &v)
	A SizeChangeStrategy for the common case where legalization for a particular operation consists of widening the type to a large legal type, unless there is no such type and then instead it should be narrowed to the largest legal type.

static SizeAndActionsVec	widenToLargerTypesUnsupportedOtherwise (const SizeAndActionsVec &v)

static SizeAndActionsVec	narrowToSmallerAndUnsupportedIfTooSmall (const SizeAndActionsVec &v)

static SizeAndActionsVec	moreToWiderTypesAndLessToWidest (const SizeAndActionsVec &v)
	A SizeChangeStrategy for the common case where legalization for a particular vector operation consists of having more elements in the vector, to a type that is legal.

static SizeAndActionsVec	increaseToLargerTypesAndDecreaseToLargest (const SizeAndActionsVec &v, LegacyLegalizeActions::LegacyLegalizeAction IncreaseAction, LegacyLegalizeActions::LegacyLegalizeAction DecreaseAction)
	Helper function to implement many typical SizeChangeStrategy functions.

static SizeAndActionsVec	decreaseToSmallerTypesAndIncreaseToSmallest (const SizeAndActionsVec &v, LegacyLegalizeActions::LegacyLegalizeAction DecreaseAction, LegacyLegalizeActions::LegacyLegalizeAction IncreaseAction)
	Helper function to implement many typical SizeChangeStrategy functions.

Detailed Description

Definition at line 119 of file LegacyLegalizerInfo.h.

Member Typedef Documentation

◆ SizeAndAction

using llvm::LegacyLegalizerInfo::SizeAndAction = std::pair<uint16_t, LegacyLegalizeActions::LegacyLegalizeAction>

Definition at line 121 of file LegacyLegalizerInfo.h.

◆ SizeAndActionsVec

using llvm::LegacyLegalizerInfo::SizeAndActionsVec = std::vector<SizeAndAction>

Definition at line 123 of file LegacyLegalizerInfo.h.

◆ SizeChangeStrategy

using llvm::LegacyLegalizerInfo::SizeChangeStrategy = std::function<SizeAndActionsVec(const SizeAndActionsVec &v)>

Definition at line 124 of file LegacyLegalizerInfo.h.

Constructor & Destructor Documentation

◆ LegacyLegalizerInfo()

LegacyLegalizerInfo::LegacyLegalizerInfo ( )

Definition at line 67 of file LegacyLegalizerInfo.cpp.

References llvm::IRSimilarity::Legal, llvm::Lower, narrowToSmallerAndUnsupportedIfTooSmall(), setLegalizeScalarToDifferentSizeStrategy(), widenToLargerTypesAndNarrowToLargest(), and widenToLargerTypesUnsupportedOtherwise().

Member Function Documentation

◆ computeTables()

void LegacyLegalizerInfo::computeTables ( )

Compute any ancillary tables needed to quickly decide how an operation should be handled.

This must be called after all "set*Action"methods but before any query is made or incorrect results may be returned.

Definition at line 105 of file LegacyLegalizerInfo.cpp.

References assert(), llvm::IRSimilarity::Legal, moreToWiderTypesAndLessToWidest(), Opcode, llvm::size(), llvm::sort(), and unsupportedForDifferentSizes().

Referenced by llvm::AArch64LegalizerInfo::AArch64LegalizerInfo(), llvm::M68kLegalizerInfo::M68kLegalizerInfo(), llvm::MipsLegalizerInfo::MipsLegalizerInfo(), llvm::PPCLegalizerInfo::PPCLegalizerInfo(), llvm::RISCVLegalizerInfo::RISCVLegalizerInfo(), llvm::SPIRVLegalizerInfo::SPIRVLegalizerInfo(), and llvm::X86LegalizerInfo::X86LegalizerInfo().

◆ decreaseToSmallerTypesAndIncreaseToSmallest()

LegacyLegalizerInfo::SizeAndActionsVec LegacyLegalizerInfo::decreaseToSmallerTypesAndIncreaseToSmallest	(	const SizeAndActionsVec &	v,
		LegacyLegalizeActions::LegacyLegalizeAction	DecreaseAction,
		LegacyLegalizeActions::LegacyLegalizeAction	IncreaseAction
	)

static

Helper function to implement many typical SizeChangeStrategy functions.

Definition at line 231 of file LegacyLegalizerInfo.cpp.

Referenced by narrowToSmallerAndUnsupportedIfTooSmall().

◆ getAction()

LegacyLegalizeActionStep LegacyLegalizerInfo::getAction ( const LegalityQuery & Query ) const

Definition at line 373 of file LegacyLegalizerInfo.cpp.

References llvm::dbgs(), llvm::IRSimilarity::Legal, LLVM_DEBUG, llvm::LegalityQuery::Opcode, and llvm::LegalityQuery::Types.

Referenced by llvm::LegalizerInfo::getAction().

◆ getOpcodeIdxForOpcode()

unsigned LegacyLegalizerInfo::getOpcodeIdxForOpcode ( unsigned Opcode ) const

Definition at line 366 of file LegacyLegalizerInfo.cpp.

References assert(), and Opcode.

◆ increaseToLargerTypesAndDecreaseToLargest()

LegacyLegalizerInfo::SizeAndActionsVec LegacyLegalizerInfo::increaseToLargerTypesAndDecreaseToLargest	(	const SizeAndActionsVec &	v,
		LegacyLegalizeActions::LegacyLegalizeAction	IncreaseAction,
		LegacyLegalizeActions::LegacyLegalizeAction	DecreaseAction
	)

static

Helper function to implement many typical SizeChangeStrategy functions.

Definition at line 211 of file LegacyLegalizerInfo.cpp.

Referenced by moreToWiderTypesAndLessToWidest(), unsupportedForDifferentSizes(), widenToLargerTypesAndNarrowToLargest(), and widenToLargerTypesUnsupportedOtherwise().

◆ moreToWiderTypesAndLessToWidest()

static SizeAndActionsVec llvm::LegacyLegalizerInfo::moreToWiderTypesAndLessToWidest ( const SizeAndActionsVec & v )

inlinestatic

A SizeChangeStrategy for the common case where legalization for a particular vector operation consists of having more elements in the vector, to a type that is legal.

Unless there is no such type and then instead it should be legalized towards the widest vector that's still legal. E.g. setAction({G_ADD, LLT::vector(8, 8)}, Legal); setAction({G_ADD, LLT::vector(16, 8)}, Legal); setAction({G_ADD, LLT::vector(2, 32)}, Legal); setAction({G_ADD, LLT::vector(4, 32)}, Legal); setLegalizeVectorElementToDifferentSizeStrategy( G_ADD, 0, moreToWiderTypesAndLessToWidest); will result in the following getAction results:

getAction({G_ADD, LLT::vector(8,8)}) returns (Legal, vector(8,8)).
getAction({G_ADD, LLT::vector(9,8)}) returns (MoreElements, vector(16,8)).
getAction({G_ADD, LLT::vector(8,32)}) returns (FewerElements, vector(4,32)).

Definition at line 262 of file LegacyLegalizerInfo.h.

References increaseToLargerTypesAndDecreaseToLargest().

Referenced by computeTables().

◆ narrowToSmallerAndUnsupportedIfTooSmall()

static SizeAndActionsVec llvm::LegacyLegalizerInfo::narrowToSmallerAndUnsupportedIfTooSmall ( const SizeAndActionsVec & v )

inlinestatic

Definition at line 237 of file LegacyLegalizerInfo.h.

References decreaseToSmallerTypesAndIncreaseToSmallest().

Referenced by LegacyLegalizerInfo().

◆ needsLegalizingToDifferentSize()

static bool llvm::LegacyLegalizerInfo::needsLegalizingToDifferentSize ( const LegacyLegalizeActions::LegacyLegalizeAction Action )

inlinestatic

Definition at line 129 of file LegacyLegalizerInfo.h.

Referenced by setAction().

◆ setAction()

void llvm::LegacyLegalizerInfo::setAction	(	const InstrAspect &	Aspect,
		LegacyLegalizeActions::LegacyLegalizeAction	Action
	)

inline

More friendly way to set an action for common types that have an LLT representation.

The LegacyLegalizeAction must be one for which NeedsLegalizingToDifferentSize returns false.

Definition at line 153 of file LegacyLegalizerInfo.h.

References assert(), llvm::InstrAspect::Idx, needsLegalizingToDifferentSize(), llvm::InstrAspect::Opcode, llvm::size(), and llvm::InstrAspect::Type.

◆ setLegalizeScalarToDifferentSizeStrategy()

void llvm::LegacyLegalizerInfo::setLegalizeScalarToDifferentSizeStrategy	(	const unsigned	Opcode,
		const unsigned	TypeIdx,
		SizeChangeStrategy	S
	)

inline

The setAction calls record the non-size-changing legalization actions to take on specificly-sized types.

The SizeChangeStrategy defines what to do when the size of the type needs to be changed to reach a legally sized type (i.e., one that was defined through a setAction call). e.g. setAction ({G_ADD, 0, LLT::scalar(32)}, Legal); setLegalizeScalarToDifferentSizeStrategy( G_ADD, 0, widenToLargerTypesAndNarrowToLargest); will end up defining getAction({G_ADD, 0, T}) to return the following actions for different scalar types T: LLT::scalar(1)..LLT::scalar(31): {WidenScalar, 0, LLT::scalar(32)} LLT::scalar(32): {Legal, 0, LLT::scalar(32)} LLT::scalar(33)..: {NarrowScalar, 0, LLT::scalar(32)}

If no SizeChangeAction gets defined, through this function, the default is unsupportedForDifferentSizes.

Definition at line 179 of file LegacyLegalizerInfo.h.

References Opcode, llvm::SmallVectorImpl< T >::resize(), and llvm::size().

Referenced by LegacyLegalizerInfo().

◆ setLegalizeVectorElementToDifferentSizeStrategy()

void llvm::LegacyLegalizerInfo::setLegalizeVectorElementToDifferentSizeStrategy	(	const unsigned	Opcode,
		const unsigned	TypeIdx,
		SizeChangeStrategy	S
	)

inline

See also setLegalizeScalarToDifferentSizeStrategy.

This function allows to set the SizeChangeStrategy for vector elements.

Definition at line 190 of file LegacyLegalizerInfo.h.

References Opcode, llvm::SmallVectorImpl< T >::resize(), and llvm::size().

◆ unsupportedForDifferentSizes()

static SizeAndActionsVec llvm::LegacyLegalizerInfo::unsupportedForDifferentSizes ( const SizeAndActionsVec & v )

inlinestatic

A SizeChangeStrategy for the common case where legalization for a particular operation consists of only supporting a specific set of type sizes.

E.g. setAction ({G_DIV, 0, LLT::scalar(32)}, Legal); setAction ({G_DIV, 0, LLT::scalar(64)}, Legal); setLegalizeScalarToDifferentSizeStrategy( G_DIV, 0, unsupportedForDifferentSizes); will result in getAction({G_DIV, 0, T}) to return Legal for s32 and s64, and Unsupported for all other scalar types T.

Definition at line 209 of file LegacyLegalizerInfo.h.

References increaseToLargerTypesAndDecreaseToLargest().

Referenced by computeTables().

◆ widenToLargerTypesAndNarrowToLargest()

static SizeAndActionsVec llvm::LegacyLegalizerInfo::widenToLargerTypesAndNarrowToLargest ( const SizeAndActionsVec & v )

inlinestatic

A SizeChangeStrategy for the common case where legalization for a particular operation consists of widening the type to a large legal type, unless there is no such type and then instead it should be narrowed to the largest legal type.

Definition at line 220 of file LegacyLegalizerInfo.h.

References assert(), and increaseToLargerTypesAndDecreaseToLargest().

Referenced by LegacyLegalizerInfo().

◆ widenToLargerTypesUnsupportedOtherwise()

static SizeAndActionsVec llvm::LegacyLegalizerInfo::widenToLargerTypesUnsupportedOtherwise ( const SizeAndActionsVec & v )

inlinestatic

Definition at line 230 of file LegacyLegalizerInfo.h.

References increaseToLargerTypesAndDecreaseToLargest().

Referenced by LegacyLegalizerInfo().

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

include/llvm/CodeGen/GlobalISel/LegacyLegalizerInfo.h
lib/CodeGen/GlobalISel/LegacyLegalizerInfo.cpp

Public Types

Public Member Functions

Static Public Member Functions

Detailed Description

Member Typedef Documentation

◆ SizeAndAction

◆ SizeAndActionsVec

◆ SizeChangeStrategy

Constructor & Destructor Documentation

◆ LegacyLegalizerInfo()

Member Function Documentation

◆ computeTables()

◆ decreaseToSmallerTypesAndIncreaseToSmallest()

◆ getAction()

◆ getOpcodeIdxForOpcode()

◆ increaseToLargerTypesAndDecreaseToLargest()

◆ moreToWiderTypesAndLessToWidest()

◆ narrowToSmallerAndUnsupportedIfTooSmall()

◆ needsLegalizingToDifferentSize()

◆ setAction()

◆ setLegalizeScalarToDifferentSizeStrategy()

◆ setLegalizeVectorElementToDifferentSizeStrategy()

◆ unsupportedForDifferentSizes()

◆ widenToLargerTypesAndNarrowToLargest()

◆ widenToLargerTypesUnsupportedOtherwise()