LLVM  6.0.0svn
Public Member Functions | Public Attributes | List of all members
llvm::TargetOptions Class Reference

#include "llvm/Target/TargetOptions.h"

Collaboration diagram for llvm::TargetOptions:
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Public Member Functions

 TargetOptions ()
 
bool DisableFramePointerElim (const MachineFunction &MF) const
 DisableFramePointerElim - This returns true if frame pointer elimination optimization should be disabled for the given machine function. More...
 
bool HonorSignDependentRoundingFPMath () const
 HonorSignDependentRoundingFPMath - Return true if the codegen must assume that the rounding mode of the FPU can change from its default. More...
 

Public Attributes

unsigned PrintMachineCode: 1
 PrintMachineCode - This flag is enabled when the -print-machineinstrs option is specified on the command line, and should enable debugging output from the code generator. More...
 
unsigned UnsafeFPMath: 1
 UnsafeFPMath - This flag is enabled when the -enable-unsafe-fp-math flag is specified on the command line. More...
 
unsigned NoInfsFPMath: 1
 NoInfsFPMath - This flag is enabled when the -enable-no-infs-fp-math flag is specified on the command line. More...
 
unsigned NoNaNsFPMath: 1
 NoNaNsFPMath - This flag is enabled when the -enable-no-nans-fp-math flag is specified on the command line. More...
 
unsigned NoTrappingFPMath: 1
 NoTrappingFPMath - This flag is enabled when the -enable-no-trapping-fp-math is specified on the command line. More...
 
unsigned NoSignedZerosFPMath: 1
 NoSignedZerosFPMath - This flag is enabled when the -enable-no-signed-zeros-fp-math is specified on the command line. More...
 
unsigned HonorSignDependentRoundingFPMathOption: 1
 HonorSignDependentRoundingFPMath - This returns true when the -enable-sign-dependent-rounding-fp-math is specified. More...
 
unsigned NoZerosInBSS: 1
 NoZerosInBSS - By default some codegens place zero-initialized data to .bss section. More...
 
unsigned GuaranteedTailCallOpt: 1
 GuaranteedTailCallOpt - This flag is enabled when -tailcallopt is specified on the commandline. More...
 
unsigned StackAlignmentOverride = 0
 StackAlignmentOverride - Override default stack alignment for target. More...
 
unsigned StackSymbolOrdering: 1
 StackSymbolOrdering - When true, this will allow CodeGen to order the local stack symbols (for code size, code locality, or any other heuristics). More...
 
unsigned EnableFastISel: 1
 EnableFastISel - This flag enables fast-path instruction selection which trades away generated code quality in favor of reducing compile time. More...
 
unsigned UseInitArray: 1
 UseInitArray - Use .init_array instead of .ctors for static constructors. More...
 
unsigned DisableIntegratedAS: 1
 Disable the integrated assembler. More...
 
DebugCompressionType CompressDebugSections = DebugCompressionType::None
 Compress DWARF debug sections. More...
 
unsigned RelaxELFRelocations: 1
 
unsigned FunctionSections: 1
 Emit functions into separate sections. More...
 
unsigned DataSections: 1
 Emit data into separate sections. More...
 
unsigned UniqueSectionNames: 1
 
unsigned TrapUnreachable: 1
 Emit target-specific trap instruction for 'unreachable' IR instructions. More...
 
unsigned EmulatedTLS: 1
 EmulatedTLS - This flag enables emulated TLS model, using emutls function in the runtime library. More...
 
unsigned EnableIPRA: 1
 This flag enables InterProcedural Register Allocation (IPRA). More...
 
FloatABI::ABIType FloatABIType = FloatABI::Default
 FloatABIType - This setting is set by -float-abi=xxx option is specfied on the command line. More...
 
FPOpFusion::FPOpFusionMode AllowFPOpFusion = FPOpFusion::Standard
 AllowFPOpFusion - This flag is set by the -fuse-fp-ops=xxx option. More...
 
ThreadModel::Model ThreadModel = ThreadModel::POSIX
 ThreadModel - This flag specifies the type of threading model to assume for things like atomics. More...
 
EABI EABIVersion = EABI::Default
 EABIVersion - This flag specifies the EABI version. More...
 
DebuggerKind DebuggerTuning = DebuggerKind::Default
 Which debugger to tune for. More...
 
FPDenormal::DenormalMode FPDenormalMode = FPDenormal::IEEE
 FPDenormalMode - This flags specificies which denormal numbers the code is permitted to require. More...
 
ExceptionHandling ExceptionModel = ExceptionHandling::None
 What exception model to use. More...
 
MCTargetOptions MCOptions
 Machine level options. More...
 

Detailed Description

Definition at line 99 of file TargetOptions.h.

Constructor & Destructor Documentation

◆ TargetOptions()

llvm::TargetOptions::TargetOptions ( )
inline

Definition at line 101 of file TargetOptions.h.

Member Function Documentation

◆ DisableFramePointerElim()

bool TargetOptions::DisableFramePointerElim ( const MachineFunction MF) const

◆ HonorSignDependentRoundingFPMath()

bool TargetOptions::HonorSignDependentRoundingFPMath ( ) const

HonorSignDependentRoundingFPMath - Return true if the codegen must assume that the rounding mode of the FPU can change from its default.

Definition at line 39 of file TargetOptionsImpl.cpp.

References HonorSignDependentRoundingFPMathOption, and UnsafeFPMath.

Referenced by GetNegatedExpression().

Member Data Documentation

◆ AllowFPOpFusion

FPOpFusion::FPOpFusionMode llvm::TargetOptions::AllowFPOpFusion = FPOpFusion::Standard

AllowFPOpFusion - This flag is set by the -fuse-fp-ops=xxx option.

This controls the creation of fused FP ops that store intermediate results in higher precision than IEEE allows (E.g. FMAs).

Fast mode - allows formation of fused FP ops whenever they're profitable. Standard mode - allow fusion only for 'blessed' FP ops. At present the only blessed op is the fmuladd intrinsic. In the future more blessed ops may be added. Strict mode - allow fusion only if/when it can be proven that the excess precision won't effect the result.

Note: This option only controls formation of fused ops by the optimizers. Fused operations that are explicitly specified (e.g. FMA via the llvm.fma.* intrinsic) will always be honored, regardless of the value of this option.

Definition at line 243 of file TargetOptions.h.

Referenced by llvm::NVPTXTargetLowering::allowFMA(), convertBuildVectorCastElt(), InitTargetOptionsFromCodeGenFlags(), isCombineInstrCandidateFP(), isContractable(), isFMAddSub(), and llvm::AArch64TargetLowering::isProfitableToHoist().

◆ CompressDebugSections

DebugCompressionType llvm::TargetOptions::CompressDebugSections = DebugCompressionType::None

Compress DWARF debug sections.

Definition at line 197 of file TargetOptions.h.

Referenced by llvm::LLVMTargetMachine::initAsmInfo().

◆ DataSections

unsigned llvm::TargetOptions::DataSections

◆ DebuggerTuning

DebuggerKind llvm::TargetOptions::DebuggerTuning = DebuggerKind::Default

Which debugger to tune for.

Definition at line 253 of file TargetOptions.h.

Referenced by computeCacheKey(), llvm::DwarfDebug::DwarfDebug(), and InitTargetOptionsFromCodeGenFlags().

◆ DisableIntegratedAS

unsigned llvm::TargetOptions::DisableIntegratedAS

Disable the integrated assembler.

Definition at line 194 of file TargetOptions.h.

Referenced by llvm::LLVMTargetMachine::initAsmInfo().

◆ EABIVersion

EABI llvm::TargetOptions::EABIVersion = EABI::Default

EABIVersion - This flag specifies the EABI version.

Definition at line 250 of file TargetOptions.h.

Referenced by llvm::ARMBaseTargetMachine::ARMBaseTargetMachine(), llvm::ARMTargetLowering::ARMTargetLowering(), and InitTargetOptionsFromCodeGenFlags().

◆ EmulatedTLS

unsigned llvm::TargetOptions::EmulatedTLS

◆ EnableFastISel

unsigned llvm::TargetOptions::EnableFastISel

EnableFastISel - This flag enables fast-path instruction selection which trades away generated code quality in favor of reducing compile time.

Definition at line 187 of file TargetOptions.h.

Referenced by llvm::MipsTargetLowering::createFastISel(), CreatePrologue(), LLVMCreateMCJITCompilerForModule(), llvm::OptLevelChanger::OptLevelChanger(), preassignSwiftErrorRegs(), promoteToConstantPool(), llvm::SelectionDAGISel::runOnMachineFunction(), llvm::TargetMachine::setFastISel(), and llvm::ARMSubtarget::useFastISel().

◆ EnableIPRA

unsigned llvm::TargetOptions::EnableIPRA

This flag enables InterProcedural Register Allocation (IPRA).

Definition at line 217 of file TargetOptions.h.

Referenced by llvm::TargetPassConfig::addMachinePasses(), llvm::TargetFrameLowering::determineCalleeSaves(), and llvm::TargetPassConfig::TargetPassConfig().

◆ ExceptionModel

ExceptionHandling llvm::TargetOptions::ExceptionModel = ExceptionHandling::None

◆ FloatABIType

FloatABI::ABIType llvm::TargetOptions::FloatABIType = FloatABI::Default

FloatABIType - This setting is set by -float-abi=xxx option is specfied on the command line.

This setting may either be Default, Soft, or Hard. Default selects the target's default behavior. Soft selects the ABI for software floating point, but does not indicate that FP hardware may not be used. Such a combination is unfortunately popular (e.g. arm-apple-darwin). Hard presumes that the normal FP ABI is used.

Definition at line 225 of file TargetOptions.h.

Referenced by llvm::ARMBaseTargetMachine::ARMBaseTargetMachine(), llvm::ARMTargetLowering::ARMTargetLowering(), checkFunctionsAttributeConsistency(), FPCCToARMCC(), getComparePred(), and InitTargetOptionsFromCodeGenFlags().

◆ FPDenormalMode

FPDenormal::DenormalMode llvm::TargetOptions::FPDenormalMode = FPDenormal::IEEE

FPDenormalMode - This flags specificies which denormal numbers the code is permitted to require.

Definition at line 257 of file TargetOptions.h.

Referenced by checkFunctionsAttributeConsistency(), InitTargetOptionsFromCodeGenFlags(), and llvm::TargetMachine::resetTargetOptions().

◆ FunctionSections

unsigned llvm::TargetOptions::FunctionSections

◆ GuaranteedTailCallOpt

unsigned llvm::TargetOptions::GuaranteedTailCallOpt

GuaranteedTailCallOpt - This flag is enabled when -tailcallopt is specified on the commandline.

When the flag is on, participating targets will perform tail call optimization on all calls which use the fastcc calling convention and which satisfy certain target-independent criteria (being at the end of a function, having the same return type as their parent function, etc.), using an alternate ABI if necessary.

Definition at line 173 of file TargetOptions.h.

Referenced by areCallingConvEligibleForTCO_64SVR4(), CallingConvSupported(), llvm::AArch64TargetLowering::CCAssignFnForReturn(), llvm::PPCFrameLowering::determineCalleeSaves(), llvm::PPCFrameLowering::eliminateCallFramePseudoInstr(), llvm::PPCFrameLowering::emitEpilogue(), EnsureStackAlignment(), getMOVL(), InitTargetOptionsFromCodeGenFlags(), llvm::SITargetLowering::isEligibleForTailCallOptimization(), llvm::isInTailCallPosition(), isSortedByValueNo(), llvm::SITargetLowering::LowerCall(), MatchingStackOffset(), mayTailCallThisCC(), llvm::PPCFrameLowering::needsFP(), PrepareCall(), llvm::PPCFrameLowering::processFunctionBeforeFrameFinalized(), and shouldGuaranteeTCO().

◆ HonorSignDependentRoundingFPMathOption

unsigned llvm::TargetOptions::HonorSignDependentRoundingFPMathOption

HonorSignDependentRoundingFPMath - This returns true when the -enable-sign-dependent-rounding-fp-math is specified.

If this returns false (the default), the code generator is allowed to assume that the rounding behavior is the default (round-to-zero for all floating point to integer conversions, and round-to-nearest for all other arithmetic truncations). If this is enabled (set to true), the code generator must assume that the rounding mode may dynamically change.

Definition at line 159 of file TargetOptions.h.

Referenced by checkFunctionsAttributeConsistency(), HonorSignDependentRoundingFPMath(), and InitTargetOptionsFromCodeGenFlags().

◆ MCOptions

MCTargetOptions llvm::TargetOptions::MCOptions

◆ NoInfsFPMath

unsigned llvm::TargetOptions::NoInfsFPMath

NoInfsFPMath - This flag is enabled when the -enable-no-infs-fp-math flag is specified on the command line.

When this flag is off (the default), the code generator is not allowed to assume the FP arithmetic arguments and results are never +-Infs.

Definition at line 133 of file TargetOptions.h.

Referenced by checkFunctionsAttributeConsistency(), InitTargetOptionsFromCodeGenFlags(), PrepareCall(), and setFastFlags().

◆ NoNaNsFPMath

unsigned llvm::TargetOptions::NoNaNsFPMath

NoNaNsFPMath - This flag is enabled when the -enable-no-nans-fp-math flag is specified on the command line.

When this flag is off (the default), the code generator is not allowed to assume the FP arithmetic arguments and results are never NaNs.

Definition at line 139 of file TargetOptions.h.

Referenced by checkFunctionsAttributeConsistency(), EmitVectorComparison(), InitTargetOptionsFromCodeGenFlags(), PrepareCall(), and setFastFlags().

◆ NoSignedZerosFPMath

unsigned llvm::TargetOptions::NoSignedZerosFPMath

NoSignedZerosFPMath - This flag is enabled when the -enable-no-signed-zeros-fp-math is specified on the command line.

This specifies that optimizations are allowed to treat the sign of a zero argument or result as insignificant.

Definition at line 150 of file TargetOptions.h.

Referenced by InitTargetOptionsFromCodeGenFlags(), and isFMulNegTwo().

◆ NoTrappingFPMath

unsigned llvm::TargetOptions::NoTrappingFPMath

NoTrappingFPMath - This flag is enabled when the -enable-no-trapping-fp-math is specified on the command line.

This specifies that there are no trap handlers to handle exceptions.

Definition at line 144 of file TargetOptions.h.

Referenced by checkFunctionsAttributeConsistency(), and InitTargetOptionsFromCodeGenFlags().

◆ NoZerosInBSS

unsigned llvm::TargetOptions::NoZerosInBSS

NoZerosInBSS - By default some codegens place zero-initialized data to .bss section.

This flag disables such behaviour (necessary, e.g. for crt*.o compiling).

Definition at line 165 of file TargetOptions.h.

Referenced by llvm::TargetLoweringObjectFile::getKindForGlobal(), and InitTargetOptionsFromCodeGenFlags().

◆ PrintMachineCode

unsigned llvm::TargetOptions::PrintMachineCode

PrintMachineCode - This flag is enabled when the -print-machineinstrs option is specified on the command line, and should enable debugging output from the code generator.

Definition at line 116 of file TargetOptions.h.

Referenced by llvm::TargetMachine::shouldPrintMachineCode(), and llvm::TargetPassConfig::TargetPassConfig().

◆ RelaxELFRelocations

unsigned llvm::TargetOptions::RelaxELFRelocations

◆ StackAlignmentOverride

unsigned llvm::TargetOptions::StackAlignmentOverride = 0

StackAlignmentOverride - Override default stack alignment for target.

Definition at line 176 of file TargetOptions.h.

Referenced by llvm::X86TargetMachine::getSubtargetImpl(), llvm::MipsTargetMachine::getSubtargetImpl(), and InitTargetOptionsFromCodeGenFlags().

◆ StackSymbolOrdering

unsigned llvm::TargetOptions::StackSymbolOrdering

StackSymbolOrdering - When true, this will allow CodeGen to order the local stack symbols (for code size, code locality, or any other heuristics).

When false, the local symbols are left in whatever order they were generated. Default is true.

Definition at line 182 of file TargetOptions.h.

Referenced by AssignProtectedObjSet(), and InitTargetOptionsFromCodeGenFlags().

◆ ThreadModel

ThreadModel::Model llvm::TargetOptions::ThreadModel = ThreadModel::POSIX

ThreadModel - This flag specifies the type of threading model to assume for things like atomics.

Definition at line 247 of file TargetOptions.h.

Referenced by InitTargetOptionsFromCodeGenFlags().

◆ TrapUnreachable

unsigned llvm::TargetOptions::TrapUnreachable

◆ UniqueSectionNames

unsigned llvm::TargetOptions::UniqueSectionNames

◆ UnsafeFPMath

unsigned llvm::TargetOptions::UnsafeFPMath

◆ UseInitArray

unsigned llvm::TargetOptions::UseInitArray

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