LLVM: llvm::SubtargetFeatures Class Reference

LLVM 8.0.1

Manages the enabling and disabling of subtarget specific features. More...

#include "llvm/MC/SubtargetFeature.h"

Public Member Functions
	SubtargetFeatures (StringRef Initial="")

std::string	getString () const
	Returns features as a string. More...

void	AddFeature (StringRef String, bool Enable=true)
	Adds Features. More...

FeatureBitset	getFeatureBits (StringRef CPU, ArrayRef< SubtargetFeatureKV > CPUTable, ArrayRef< SubtargetFeatureKV > FeatureTable)
	Returns feature bits of a CPU. More...

const std::vector< std::string > &	getFeatures () const
	Returns the vector of individual subtarget features. More...

void	print (raw_ostream &OS) const
	Prints feature string. More...

void	dump () const

void	getDefaultSubtargetFeatures (const Triple &Triple)
	Adds the default features for the specified target triple. More...

Static Public Member Functions
static void	ToggleFeature (FeatureBitset &Bits, StringRef String, ArrayRef< SubtargetFeatureKV > FeatureTable)
	Toggles a feature and update the feature bits. More...

static void	ApplyFeatureFlag (FeatureBitset &Bits, StringRef Feature, ArrayRef< SubtargetFeatureKV > FeatureTable)
	Applies the feature flag and update the feature bits. More...

Detailed Description

Manages the enabling and disabling of subtarget specific features.

Features are encoded as a string of the form "+attr1,+attr2,-attr3,...,+attrN" A comma separates each feature from the next (all lowercase.) Each of the remaining features is prefixed with + or - indicating whether that feature should be enabled or disabled contrary to the cpu specification.

Definition at line 93 of file SubtargetFeature.h.

Constructor & Destructor Documentation

◆ SubtargetFeatures()

SubtargetFeatures::SubtargetFeatures ( StringRef Initial = "" )

explicit

Definition at line 115 of file SubtargetFeature.cpp.

References Split().

Member Function Documentation

◆ AddFeature()

void SubtargetFeatures::AddFeature	(	StringRef	String,
		bool	Enable = `true`
	)

Adds Features.

Definition at line 65 of file SubtargetFeature.cpp.

References llvm::StringRef::empty(), hasFlag(), and llvm::StringRef::lower().

Referenced by llvm::orc::JITTargetMachineBuilder::addFeatures(), llvm::lto::Config::addSaveTemps(), llvm::object::ELFObjectFileBase::getARMFeatures(), getDefaultSubtargetFeatures(), llvm::object::ELFObjectFileBase::getMIPSFeatures(), llvm::object::ELFObjectFileBase::getRISCVFeatures(), LLVMGetHostCPUFeatures(), and llvm::EngineBuilder::selectTarget().

◆ ApplyFeatureFlag()

void SubtargetFeatures::ApplyFeatureFlag	(	FeatureBitset &	Bits,
		StringRef	Feature,
		ArrayRef< SubtargetFeatureKV >	FeatureTable
	)

static

Applies the feature flag and update the feature bits.

Definition at line 177 of file SubtargetFeature.cpp.

References assert(), ClearImpliedBits(), llvm::errs(), Find(), hasFlag(), isEnabled(), SetImpliedBits(), StripFlag(), and llvm::SubtargetFeatureKV::Value.

Referenced by llvm::MCSubtargetInfo::ApplyFeatureFlag(), llvm::MCSubtargetInfo::checkFeatures(), and getFeatureBits().

◆ dump()

LLVM_DUMP_METHOD void SubtargetFeatures::dump ( ) const

Definition at line 261 of file SubtargetFeature.cpp.

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

◆ getDefaultSubtargetFeatures()

void SubtargetFeatures::getDefaultSubtargetFeatures ( const Triple & Triple )

Adds the default features for the specified target triple.

Definition at line 266 of file SubtargetFeature.cpp.

References AddFeature(), llvm::Triple::Apple, llvm::Triple::getArch(), llvm::Triple::getVendor(), llvm::Triple::ppc, and llvm::Triple::ppc64.

Referenced by llvm::lto::Config::addSaveTemps(), llvm::LTOCodeGenerator::compile(), llvm::TargetMachineBuilder::create(), and parseBitcodeFileImpl().

◆ getFeatureBits()

FeatureBitset SubtargetFeatures::getFeatureBits	(	StringRef	CPU,
		ArrayRef< SubtargetFeatureKV >	CPUTable,
		ArrayRef< SubtargetFeatureKV >	FeatureTable
	)

Returns feature bits of a CPU.

Definition at line 205 of file SubtargetFeature.cpp.

References ApplyFeatureFlag(), assert(), llvm::sys::path::begin(), llvm::tgtok::Bits, llvm::StringRef::empty(), llvm::ArrayRef< T >::empty(), llvm::sys::path::end(), llvm::errs(), Find(), Help(), SetImpliedBits(), and llvm::SubtargetFeatureKV::Value.

Referenced by getFeatures().

◆ getFeatures()

const std::vector<std::string>& llvm::SubtargetFeatures::getFeatures ( ) const

inline

Returns the vector of individual subtarget features.

Definition at line 119 of file SubtargetFeature.h.

References llvm::dump(), Features, and print().

Referenced by llvm::MCSubtargetInfo::checkFeatures().

◆ getString()

std::string SubtargetFeatures::getString ( ) const

Returns features as a string.

Definition at line 120 of file SubtargetFeature.cpp.

References llvm::join().

Referenced by llvm::lto::Config::addSaveTemps(), llvm::LTOCodeGenerator::compile(), llvm::TargetMachineBuilder::create(), llvm::orc::JITTargetMachineBuilder::createTargetMachine(), LLVMGetHostCPUFeatures(), parseBitcodeFileImpl(), and llvm::EngineBuilder::selectTarget().

◆ print()

void SubtargetFeatures::print ( raw_ostream & OS ) const

Prints feature string.

Definition at line 254 of file SubtargetFeature.cpp.

References F().

Referenced by dump().

◆ ToggleFeature()

void SubtargetFeatures::ToggleFeature	(	FeatureBitset &	Bits,
		StringRef	String,
		ArrayRef< SubtargetFeatureKV >	FeatureTable
	)

static

Toggles a feature and update the feature bits.

Definition at line 154 of file SubtargetFeature.cpp.

References ClearImpliedBits(), llvm::errs(), Find(), SetImpliedBits(), StripFlag(), and llvm::SubtargetFeatureKV::Value.

Referenced by llvm::MCSubtargetInfo::ToggleFeature().

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

include/llvm/MC/SubtargetFeature.h
lib/MC/SubtargetFeature.cpp