llvm::BPFTargetLowering Class Reference

#include "Target/BPF/BPFISelLowering.h"

Inheritance diagram for llvm::BPFTargetLowering:

Public Member Functions
	BPFTargetLowering (const TargetMachine &TM, const BPFSubtarget &STI)
SDValue	LowerOperation (SDValue Op, SelectionDAG &DAG) const override
	This callback is invoked for operations that are unsupported by the target, which are registered to use 'custom' lowering, and whose defined values are all legal.
const char *	getTargetNodeName (unsigned Opcode) const override
	This method returns the name of a target specific DAG node.
bool	isOffsetFoldingLegal (const GlobalAddressSDNode *GA) const override
	Return true if folding a constant offset with the given GlobalAddress is legal.
BPFTargetLowering::ConstraintType	getConstraintType (StringRef Constraint) const override
	Given a constraint, return the type of constraint it is for this target.
std::pair< unsigned, const TargetRegisterClass * >	getRegForInlineAsmConstraint (const TargetRegisterInfo *TRI, StringRef Constraint, MVT VT) const override
	Given a physical register constraint (e.g.
MachineBasicBlock *	EmitInstrWithCustomInserter (MachineInstr &MI, MachineBasicBlock *BB) const override
	This method should be implemented by targets that mark instructions with the 'usesCustomInserter' flag.
bool	getHasAlu32 () const
bool	getHasJmp32 () const
bool	getHasJmpExt () const
EVT	getSetCCResultType (const DataLayout &DL, LLVMContext &Context, EVT VT) const override
	Return the ValueType of the result of SETCC operations.
MVT	getScalarShiftAmountTy (const DataLayout &, EVT) const override
	Return the type to use for a scalar shift opcode, given the shifted amount type.
Public Member Functions inherited from llvm::TargetLowering
	TargetLowering (const TargetLowering &)=delete
TargetLowering &	operator= (const TargetLowering &)=delete
	TargetLowering (const TargetMachine &TM)
	NOTE: The TargetMachine owns TLOF.
bool	isPositionIndependent () const
virtual bool	isSDNodeSourceOfDivergence (const SDNode *N, FunctionLoweringInfo *FLI, UniformityInfo *UA) const
virtual bool	isReassocProfitable (SelectionDAG &DAG, SDValue N0, SDValue N1) const
virtual bool	isReassocProfitable (MachineRegisterInfo &MRI, Register N0, Register N1) const
virtual bool	isSDNodeAlwaysUniform (const SDNode *N) const
virtual bool	getPreIndexedAddressParts (SDNode *, SDValue &, SDValue &, ISD::MemIndexedMode &, SelectionDAG &) const
	Returns true by value, base pointer and offset pointer and addressing mode by reference if the node's address can be legally represented as pre-indexed load / store address.
virtual bool	getPostIndexedAddressParts (SDNode *, SDNode *, SDValue &, SDValue &, ISD::MemIndexedMode &, SelectionDAG &) const
	Returns true by value, base pointer and offset pointer and addressing mode by reference if this node can be combined with a load / store to form a post-indexed load / store.
virtual bool	isIndexingLegal (MachineInstr &MI, Register Base, Register Offset, bool IsPre, MachineRegisterInfo &MRI) const
	Returns true if the specified base+offset is a legal indexed addressing mode for this target.
virtual unsigned	getJumpTableEncoding () const
	Return the entry encoding for a jump table in the current function.
virtual MVT	getJumpTableRegTy (const DataLayout &DL) const
virtual const MCExpr *	LowerCustomJumpTableEntry (const MachineJumpTableInfo *, const MachineBasicBlock *, unsigned, MCContext &) const
virtual SDValue	getPICJumpTableRelocBase (SDValue Table, SelectionDAG &DAG) const
	Returns relocation base for the given PIC jumptable.
virtual const MCExpr *	getPICJumpTableRelocBaseExpr (const MachineFunction *MF, unsigned JTI, MCContext &Ctx) const
	This returns the relocation base for the given PIC jumptable, the same as getPICJumpTableRelocBase, but as an MCExpr.
virtual bool	isOffsetFoldingLegal (const GlobalAddressSDNode *GA) const
	Return true if folding a constant offset with the given GlobalAddress is legal.
virtual bool	isInlineAsmTargetBranch (const SmallVectorImpl< StringRef > &AsmStrs, unsigned OpNo) const
	On x86, return true if the operand with index OpNo is a CALL or JUMP instruction, which can use either a memory constraint or an address constraint.
bool	isInTailCallPosition (SelectionDAG &DAG, SDNode *Node, SDValue &Chain) const
	Check whether a given call node is in tail position within its function.
void	softenSetCCOperands (SelectionDAG &DAG, EVT VT, SDValue &NewLHS, SDValue &NewRHS, ISD::CondCode &CCCode, const SDLoc &DL, const SDValue OldLHS, const SDValue OldRHS) const
	Soften the operands of a comparison.
void	softenSetCCOperands (SelectionDAG &DAG, EVT VT, SDValue &NewLHS, SDValue &NewRHS, ISD::CondCode &CCCode, const SDLoc &DL, const SDValue OldLHS, const SDValue OldRHS, SDValue &Chain, bool IsSignaling=false) const
virtual SDValue	visitMaskedLoad (SelectionDAG &DAG, const SDLoc &DL, SDValue Chain, MachineMemOperand *MMO, SDValue &NewLoad, SDValue Ptr, SDValue PassThru, SDValue Mask) const
virtual SDValue	visitMaskedStore (SelectionDAG &DAG, const SDLoc &DL, SDValue Chain, MachineMemOperand *MMO, SDValue Ptr, SDValue Val, SDValue Mask) const
std::pair< SDValue, SDValue >	makeLibCall (SelectionDAG &DAG, RTLIB::Libcall LC, EVT RetVT, ArrayRef< SDValue > Ops, MakeLibCallOptions CallOptions, const SDLoc &dl, SDValue Chain=SDValue()) const
	Returns a pair of (return value, chain).
bool	parametersInCSRMatch (const MachineRegisterInfo &MRI, const uint32_t *CallerPreservedMask, const SmallVectorImpl< CCValAssign > &ArgLocs, const SmallVectorImpl< SDValue > &OutVals) const
	Check whether parameters to a call that are passed in callee saved registers are the same as from the calling function.
virtual bool	findOptimalMemOpLowering (std::vector< EVT > &MemOps, unsigned Limit, const MemOp &Op, unsigned DstAS, unsigned SrcAS, const AttributeList &FuncAttributes) const
	Determines the optimal series of memory ops to replace the memset / memcpy.
bool	ShrinkDemandedConstant (SDValue Op, const APInt &DemandedBits, const APInt &DemandedElts, TargetLoweringOpt &TLO) const
	Check to see if the specified operand of the specified instruction is a constant integer.
bool	ShrinkDemandedConstant (SDValue Op, const APInt &DemandedBits, TargetLoweringOpt &TLO) const
	Helper wrapper around ShrinkDemandedConstant, demanding all elements.
virtual bool	targetShrinkDemandedConstant (SDValue Op, const APInt &DemandedBits, const APInt &DemandedElts, TargetLoweringOpt &TLO) const
bool	ShrinkDemandedOp (SDValue Op, unsigned BitWidth, const APInt &DemandedBits, TargetLoweringOpt &TLO) const
	Convert x+y to (VT)((SmallVT)x+(SmallVT)y) if the casts are free.
bool	SimplifyDemandedBits (SDValue Op, const APInt &DemandedBits, const APInt &DemandedElts, KnownBits &Known, TargetLoweringOpt &TLO, unsigned Depth=0, bool AssumeSingleUse=false) const
	Look at Op.
bool	SimplifyDemandedBits (SDValue Op, const APInt &DemandedBits, KnownBits &Known, TargetLoweringOpt &TLO, unsigned Depth=0, bool AssumeSingleUse=false) const
	Helper wrapper around SimplifyDemandedBits, demanding all elements.
bool	SimplifyDemandedBits (SDValue Op, const APInt &DemandedBits, DAGCombinerInfo &DCI) const
	Helper wrapper around SimplifyDemandedBits.
bool	SimplifyDemandedBits (SDValue Op, const APInt &DemandedBits, const APInt &DemandedElts, DAGCombinerInfo &DCI) const
	Helper wrapper around SimplifyDemandedBits.
SDValue	SimplifyMultipleUseDemandedBits (SDValue Op, const APInt &DemandedBits, const APInt &DemandedElts, SelectionDAG &DAG, unsigned Depth=0) const
	More limited version of SimplifyDemandedBits that can be used to "look through" ops that don't contribute to the DemandedBits/DemandedElts - bitwise ops etc.
SDValue	SimplifyMultipleUseDemandedBits (SDValue Op, const APInt &DemandedBits, SelectionDAG &DAG, unsigned Depth=0) const
	Helper wrapper around SimplifyMultipleUseDemandedBits, demanding all elements.
SDValue	SimplifyMultipleUseDemandedVectorElts (SDValue Op, const APInt &DemandedElts, SelectionDAG &DAG, unsigned Depth=0) const
	Helper wrapper around SimplifyMultipleUseDemandedBits, demanding all bits from only some vector elements.
bool	SimplifyDemandedVectorElts (SDValue Op, const APInt &DemandedEltMask, APInt &KnownUndef, APInt &KnownZero, TargetLoweringOpt &TLO, unsigned Depth=0, bool AssumeSingleUse=false) const
	Look at Vector Op.
bool	SimplifyDemandedVectorElts (SDValue Op, const APInt &DemandedElts, DAGCombinerInfo &DCI) const
	Helper wrapper around SimplifyDemandedVectorElts.
virtual bool	shouldSimplifyDemandedVectorElts (SDValue Op, const TargetLoweringOpt &TLO) const
	Return true if the target supports simplifying demanded vector elements by converting them to undefs.
virtual void	computeKnownBitsForTargetNode (const SDValue Op, KnownBits &Known, const APInt &DemandedElts, const SelectionDAG &DAG, unsigned Depth=0) const
	Determine which of the bits specified in Mask are known to be either zero or one and return them in the KnownZero/KnownOne bitsets.
virtual void	computeKnownBitsForTargetInstr (GISelKnownBits &Analysis, Register R, KnownBits &Known, const APInt &DemandedElts, const MachineRegisterInfo &MRI, unsigned Depth=0) const
	Determine which of the bits specified in Mask are known to be either zero or one and return them in the KnownZero/KnownOne bitsets.
virtual Align	computeKnownAlignForTargetInstr (GISelKnownBits &Analysis, Register R, const MachineRegisterInfo &MRI, unsigned Depth=0) const
	Determine the known alignment for the pointer value R.
virtual void	computeKnownBitsForFrameIndex (int FIOp, KnownBits &Known, const MachineFunction &MF) const
	Determine which of the bits of FrameIndex FIOp are known to be 0.
virtual unsigned	ComputeNumSignBitsForTargetNode (SDValue Op, const APInt &DemandedElts, const SelectionDAG &DAG, unsigned Depth=0) const
	This method can be implemented by targets that want to expose additional information about sign bits to the DAG Combiner.
virtual unsigned	computeNumSignBitsForTargetInstr (GISelKnownBits &Analysis, Register R, const APInt &DemandedElts, const MachineRegisterInfo &MRI, unsigned Depth=0) const
	This method can be implemented by targets that want to expose additional information about sign bits to GlobalISel combiners.
virtual bool	SimplifyDemandedVectorEltsForTargetNode (SDValue Op, const APInt &DemandedElts, APInt &KnownUndef, APInt &KnownZero, TargetLoweringOpt &TLO, unsigned Depth=0) const
	Attempt to simplify any target nodes based on the demanded vector elements, returning true on success.
virtual bool	SimplifyDemandedBitsForTargetNode (SDValue Op, const APInt &DemandedBits, const APInt &DemandedElts, KnownBits &Known, TargetLoweringOpt &TLO, unsigned Depth=0) const
	Attempt to simplify any target nodes based on the demanded bits/elts, returning true on success.
virtual SDValue	SimplifyMultipleUseDemandedBitsForTargetNode (SDValue Op, const APInt &DemandedBits, const APInt &DemandedElts, SelectionDAG &DAG, unsigned Depth) const
	More limited version of SimplifyDemandedBits that can be used to "look through" ops that don't contribute to the DemandedBits/DemandedElts - bitwise ops etc.
virtual bool	isGuaranteedNotToBeUndefOrPoisonForTargetNode (SDValue Op, const APInt &DemandedElts, const SelectionDAG &DAG, bool PoisonOnly, unsigned Depth) const
	Return true if this function can prove that Op is never poison and, if PoisonOnly is false, does not have undef bits.
virtual bool	canCreateUndefOrPoisonForTargetNode (SDValue Op, const APInt &DemandedElts, const SelectionDAG &DAG, bool PoisonOnly, bool ConsiderFlags, unsigned Depth) const
	Return true if Op can create undef or poison from non-undef & non-poison operands.
SDValue	buildLegalVectorShuffle (EVT VT, const SDLoc &DL, SDValue N0, SDValue N1, MutableArrayRef< int > Mask, SelectionDAG &DAG) const
	Tries to build a legal vector shuffle using the provided parameters or equivalent variations.
virtual const Constant *	getTargetConstantFromLoad (LoadSDNode *LD) const
	This method returns the constant pool value that will be loaded by LD.
virtual bool	isKnownNeverNaNForTargetNode (SDValue Op, const SelectionDAG &DAG, bool SNaN=false, unsigned Depth=0) const
	If SNaN is false,.
virtual bool	isSplatValueForTargetNode (SDValue Op, const APInt &DemandedElts, APInt &UndefElts, const SelectionDAG &DAG, unsigned Depth=0) const
	Return true if vector Op has the same value across all DemandedElts, indicating any elements which may be undef in the output UndefElts.
virtual bool	isTargetCanonicalConstantNode (SDValue Op) const
	Returns true if the given Opc is considered a canonical constant for the target, which should not be transformed back into a BUILD_VECTOR.
bool	isConstTrueVal (SDValue N) const
	Return if the N is a constant or constant vector equal to the true value from getBooleanContents().
bool	isConstFalseVal (SDValue N) const
	Return if the N is a constant or constant vector equal to the false value from getBooleanContents().
bool	isExtendedTrueVal (const ConstantSDNode *N, EVT VT, bool SExt) const
	Return if N is a True value when extended to VT.
SDValue	SimplifySetCC (EVT VT, SDValue N0, SDValue N1, ISD::CondCode Cond, bool foldBooleans, DAGCombinerInfo &DCI, const SDLoc &dl) const
	Try to simplify a setcc built with the specified operands and cc.
virtual SDValue	unwrapAddress (SDValue N) const
virtual bool	isGAPlusOffset (SDNode *N, const GlobalValue *&GA, int64_t &Offset) const
	Returns true (and the GlobalValue and the offset) if the node is a GlobalAddress + offset.
virtual SDValue	PerformDAGCombine (SDNode *N, DAGCombinerInfo &DCI) const
	This method will be invoked for all target nodes and for any target-independent nodes that the target has registered with invoke it for.
virtual bool	isDesirableToCommuteWithShift (const SDNode *N, CombineLevel Level) const
	Return true if it is profitable to move this shift by a constant amount through its operand, adjusting any immediate operands as necessary to preserve semantics.
virtual bool	isDesirableToCommuteWithShift (const MachineInstr &MI, bool IsAfterLegal) const
	GlobalISel - return true if it is profitable to move this shift by a constant amount through its operand, adjusting any immediate operands as necessary to preserve semantics.
virtual bool	isDesirableToPullExtFromShl (const MachineInstr &MI) const
	GlobalISel - return true if it's profitable to perform the combine: shl ([sza]ext x), y => zext (shl x, y)
virtual AndOrSETCCFoldKind	isDesirableToCombineLogicOpOfSETCC (const SDNode *LogicOp, const SDNode *SETCC0, const SDNode *SETCC1) const
virtual bool	isDesirableToCommuteXorWithShift (const SDNode *N) const
	Return true if it is profitable to combine an XOR of a logical shift to create a logical shift of NOT.
virtual bool	isTypeDesirableForOp (unsigned, EVT VT) const
	Return true if the target has native support for the specified value type and it is 'desirable' to use the type for the given node type.
virtual bool	isDesirableToTransformToIntegerOp (unsigned, EVT) const
	Return true if it is profitable for dag combiner to transform a floating point op of specified opcode to a equivalent op of an integer type.
virtual bool	IsDesirableToPromoteOp (SDValue, EVT &) const
	This method query the target whether it is beneficial for dag combiner to promote the specified node.
virtual bool	supportSwiftError () const
	Return true if the target supports swifterror attribute.
virtual bool	supportSplitCSR (MachineFunction *MF) const
	Return true if the target supports that a subset of CSRs for the given machine function is handled explicitly via copies.
virtual bool	supportKCFIBundles () const
	Return true if the target supports kcfi operand bundles.
virtual bool	supportPtrAuthBundles () const
	Return true if the target supports ptrauth operand bundles.
virtual void	initializeSplitCSR (MachineBasicBlock *Entry) const
	Perform necessary initialization to handle a subset of CSRs explicitly via copies.
virtual void	insertCopiesSplitCSR (MachineBasicBlock *Entry, const SmallVectorImpl< MachineBasicBlock * > &Exits) const
	Insert explicit copies in entry and exit blocks.
virtual SDValue	getNegatedExpression (SDValue Op, SelectionDAG &DAG, bool LegalOps, bool OptForSize, NegatibleCost &Cost, unsigned Depth=0) const
	Return the newly negated expression if the cost is not expensive and set the cost in Cost to indicate that if it is cheaper or neutral to do the negation.
SDValue	getCheaperOrNeutralNegatedExpression (SDValue Op, SelectionDAG &DAG, bool LegalOps, bool OptForSize, const NegatibleCost CostThreshold=NegatibleCost::Neutral, unsigned Depth=0) const
SDValue	getCheaperNegatedExpression (SDValue Op, SelectionDAG &DAG, bool LegalOps, bool OptForSize, unsigned Depth=0) const
	This is the helper function to return the newly negated expression only when the cost is cheaper.
SDValue	getNegatedExpression (SDValue Op, SelectionDAG &DAG, bool LegalOps, bool OptForSize, unsigned Depth=0) const
	This is the helper function to return the newly negated expression if the cost is not expensive.
virtual bool	splitValueIntoRegisterParts (SelectionDAG &DAG, const SDLoc &DL, SDValue Val, SDValue *Parts, unsigned NumParts, MVT PartVT, std::optional< CallingConv::ID > CC) const
	Target-specific splitting of values into parts that fit a register storing a legal type.
virtual bool	checkForPhysRegDependency (SDNode *Def, SDNode *User, unsigned Op, const TargetRegisterInfo *TRI, const TargetInstrInfo *TII, unsigned &PhysReg, int &Cost) const
	Allows the target to handle physreg-carried dependency in target-specific way.
virtual SDValue	joinRegisterPartsIntoValue (SelectionDAG &DAG, const SDLoc &DL, const SDValue *Parts, unsigned NumParts, MVT PartVT, EVT ValueVT, std::optional< CallingConv::ID > CC) const
	Target-specific combining of register parts into its original value.
virtual SDValue	LowerFormalArguments (SDValue, CallingConv::ID, bool, const SmallVectorImpl< ISD::InputArg > &, const SDLoc &, SelectionDAG &, SmallVectorImpl< SDValue > &) const
	This hook must be implemented to lower the incoming (formal) arguments, described by the Ins array, into the specified DAG.
std::pair< SDValue, SDValue >	LowerCallTo (CallLoweringInfo &CLI) const
	This function lowers an abstract call to a function into an actual call.
virtual SDValue	LowerCall (CallLoweringInfo &, SmallVectorImpl< SDValue > &) const
	This hook must be implemented to lower calls into the specified DAG.
virtual void	HandleByVal (CCState *, unsigned &, Align) const
	Target-specific cleanup for formal ByVal parameters.
virtual bool	CanLowerReturn (CallingConv::ID, MachineFunction &, bool, const SmallVectorImpl< ISD::OutputArg > &, LLVMContext &) const
	This hook should be implemented to check whether the return values described by the Outs array can fit into the return registers.
virtual SDValue	LowerReturn (SDValue, CallingConv::ID, bool, const SmallVectorImpl< ISD::OutputArg > &, const SmallVectorImpl< SDValue > &, const SDLoc &, SelectionDAG &) const
	This hook must be implemented to lower outgoing return values, described by the Outs array, into the specified DAG.
virtual bool	isUsedByReturnOnly (SDNode *, SDValue &) const
	Return true if result of the specified node is used by a return node only.
virtual bool	mayBeEmittedAsTailCall (const CallInst *) const
	Return true if the target may be able emit the call instruction as a tail call.
virtual Register	getRegisterByName (const char *RegName, LLT Ty, const MachineFunction &MF) const
	Return the register ID of the name passed in.
virtual EVT	getTypeForExtReturn (LLVMContext &Context, EVT VT, ISD::NodeType) const
	Return the type that should be used to zero or sign extend a zeroext/signext integer return value.
virtual bool	functionArgumentNeedsConsecutiveRegisters (Type *Ty, CallingConv::ID CallConv, bool isVarArg, const DataLayout &DL) const
	For some targets, an LLVM struct type must be broken down into multiple simple types, but the calling convention specifies that the entire struct must be passed in a block of consecutive registers.
virtual bool	shouldSplitFunctionArgumentsAsLittleEndian (const DataLayout &DL) const
	For most targets, an LLVM type must be broken down into multiple smaller types.
virtual const MCPhysReg *	getScratchRegisters (CallingConv::ID CC) const
	Returns a 0 terminated array of registers that can be safely used as scratch registers.
virtual ArrayRef< MCPhysReg >	getRoundingControlRegisters () const
	Returns a 0 terminated array of rounding control registers that can be attached into strict FP call.
virtual SDValue	prepareVolatileOrAtomicLoad (SDValue Chain, const SDLoc &DL, SelectionDAG &DAG) const
	This callback is used to prepare for a volatile or atomic load.
virtual void	LowerOperationWrapper (SDNode *N, SmallVectorImpl< SDValue > &Results, SelectionDAG &DAG) const
	This callback is invoked by the type legalizer to legalize nodes with an illegal operand type but legal result types.
virtual SDValue	LowerOperation (SDValue Op, SelectionDAG &DAG) const
	This callback is invoked for operations that are unsupported by the target, which are registered to use 'custom' lowering, and whose defined values are all legal.
virtual void	ReplaceNodeResults (SDNode *, SmallVectorImpl< SDValue > &, SelectionDAG &) const
	This callback is invoked when a node result type is illegal for the target, and the operation was registered to use 'custom' lowering for that result type.
virtual const char *	getTargetNodeName (unsigned Opcode) const
	This method returns the name of a target specific DAG node.
virtual FastISel *	createFastISel (FunctionLoweringInfo &, const TargetLibraryInfo *) const
	This method returns a target specific FastISel object, or null if the target does not support "fast" ISel.
bool	verifyReturnAddressArgumentIsConstant (SDValue Op, SelectionDAG &DAG) const
virtual void	verifyTargetSDNode (const SDNode *N) const
	Check the given SDNode. Aborts if it is invalid.
virtual bool	ExpandInlineAsm (CallInst *) const
	This hook allows the target to expand an inline asm call to be explicit llvm code if it wants to.
virtual AsmOperandInfoVector	ParseConstraints (const DataLayout &DL, const TargetRegisterInfo *TRI, const CallBase &Call) const
	Split up the constraint string from the inline assembly value into the specific constraints and their prefixes, and also tie in the associated operand values.
virtual ConstraintWeight	getMultipleConstraintMatchWeight (AsmOperandInfo &info, int maIndex) const
	Examine constraint type and operand type and determine a weight value.
virtual ConstraintWeight	getSingleConstraintMatchWeight (AsmOperandInfo &info, const char *constraint) const
	Examine constraint string and operand type and determine a weight value.
virtual void	ComputeConstraintToUse (AsmOperandInfo &OpInfo, SDValue Op, SelectionDAG *DAG=nullptr) const
	Determines the constraint code and constraint type to use for the specific AsmOperandInfo, setting OpInfo.ConstraintCode and OpInfo.ConstraintType.
virtual ConstraintType	getConstraintType (StringRef Constraint) const
	Given a constraint, return the type of constraint it is for this target.
ConstraintGroup	getConstraintPreferences (AsmOperandInfo &OpInfo) const
	Given an OpInfo with list of constraints codes as strings, return a sorted Vector of pairs of constraint codes and their types in priority of what we'd prefer to lower them as.
virtual std::pair< unsigned, const TargetRegisterClass * >	getRegForInlineAsmConstraint (const TargetRegisterInfo *TRI, StringRef Constraint, MVT VT) const
	Given a physical register constraint (e.g.
virtual InlineAsm::ConstraintCode	getInlineAsmMemConstraint (StringRef ConstraintCode) const
virtual const char *	LowerXConstraint (EVT ConstraintVT) const
	Try to replace an X constraint, which matches anything, with another that has more specific requirements based on the type of the corresponding operand.
virtual void	LowerAsmOperandForConstraint (SDValue Op, StringRef Constraint, std::vector< SDValue > &Ops, SelectionDAG &DAG) const
	Lower the specified operand into the Ops vector.
virtual SDValue	LowerAsmOutputForConstraint (SDValue &Chain, SDValue &Glue, const SDLoc &DL, const AsmOperandInfo &OpInfo, SelectionDAG &DAG) const
virtual void	CollectTargetIntrinsicOperands (const CallInst &I, SmallVectorImpl< SDValue > &Ops, SelectionDAG &DAG) const
SDValue	BuildSDIV (SDNode *N, SelectionDAG &DAG, bool IsAfterLegalization, bool IsAfterLegalTypes, SmallVectorImpl< SDNode * > &Created) const
	Given an ISD::SDIV node expressing a divide by constant, return a DAG expression to select that will generate the same value by multiplying by a magic number.
SDValue	BuildUDIV (SDNode *N, SelectionDAG &DAG, bool IsAfterLegalization, bool IsAfterLegalTypes, SmallVectorImpl< SDNode * > &Created) const
	Given an ISD::UDIV node expressing a divide by constant, return a DAG expression to select that will generate the same value by multiplying by a magic number.
SDValue	buildSDIVPow2WithCMov (SDNode *N, const APInt &Divisor, SelectionDAG &DAG, SmallVectorImpl< SDNode * > &Created) const
	Build sdiv by power-of-2 with conditional move instructions Ref: "Hacker's Delight" by Henry Warren 10-1 If conditional move/branch is preferred, we lower sdiv x, +/-2**k into: bgez x, label add x, x, 2**k-1 label: sra res, x, k neg res, res (when the divisor is negative)
virtual SDValue	BuildSDIVPow2 (SDNode *N, const APInt &Divisor, SelectionDAG &DAG, SmallVectorImpl< SDNode * > &Created) const
	Targets may override this function to provide custom SDIV lowering for power-of-2 denominators.
virtual SDValue	BuildSREMPow2 (SDNode *N, const APInt &Divisor, SelectionDAG &DAG, SmallVectorImpl< SDNode * > &Created) const
	Targets may override this function to provide custom SREM lowering for power-of-2 denominators.
virtual unsigned	combineRepeatedFPDivisors () const
	Indicate whether this target prefers to combine FDIVs with the same divisor.
virtual SDValue	getSqrtEstimate (SDValue Operand, SelectionDAG &DAG, int Enabled, int &RefinementSteps, bool &UseOneConstNR, bool Reciprocal) const
	Hooks for building estimates in place of slower divisions and square roots.
SDValue	createSelectForFMINNUM_FMAXNUM (SDNode *Node, SelectionDAG &DAG) const
	Try to convert the fminnum/fmaxnum to a compare/select sequence.
virtual SDValue	getRecipEstimate (SDValue Operand, SelectionDAG &DAG, int Enabled, int &RefinementSteps) const
	Return a reciprocal estimate value for the input operand.
virtual SDValue	getSqrtInputTest (SDValue Operand, SelectionDAG &DAG, const DenormalMode &Mode) const
	Return a target-dependent comparison result if the input operand is suitable for use with a square root estimate calculation.
virtual SDValue	getSqrtResultForDenormInput (SDValue Operand, SelectionDAG &DAG) const
	Return a target-dependent result if the input operand is not suitable for use with a square root estimate calculation.
bool	expandMUL_LOHI (unsigned Opcode, EVT VT, const SDLoc &dl, SDValue LHS, SDValue RHS, SmallVectorImpl< SDValue > &Result, EVT HiLoVT, SelectionDAG &DAG, MulExpansionKind Kind, SDValue LL=SDValue(), SDValue LH=SDValue(), SDValue RL=SDValue(), SDValue RH=SDValue()) const
	Expand a MUL or [US]MUL_LOHI of n-bit values into two or four nodes, respectively, each computing an n/2-bit part of the result.
bool	expandMUL (SDNode *N, SDValue &Lo, SDValue &Hi, EVT HiLoVT, SelectionDAG &DAG, MulExpansionKind Kind, SDValue LL=SDValue(), SDValue LH=SDValue(), SDValue RL=SDValue(), SDValue RH=SDValue()) const
	Expand a MUL into two nodes.
bool	expandDIVREMByConstant (SDNode *N, SmallVectorImpl< SDValue > &Result, EVT HiLoVT, SelectionDAG &DAG, SDValue LL=SDValue(), SDValue LH=SDValue()) const
	Attempt to expand an n-bit div/rem/divrem by constant using a n/2-bit urem by constant and other arithmetic ops.
SDValue	expandFunnelShift (SDNode *N, SelectionDAG &DAG) const
	Expand funnel shift.
SDValue	expandROT (SDNode *N, bool AllowVectorOps, SelectionDAG &DAG) const
	Expand rotations.
void	expandShiftParts (SDNode *N, SDValue &Lo, SDValue &Hi, SelectionDAG &DAG) const
	Expand shift-by-parts.
bool	expandFP_TO_SINT (SDNode *N, SDValue &Result, SelectionDAG &DAG) const
	Expand float(f32) to SINT(i64) conversion.
bool	expandFP_TO_UINT (SDNode *N, SDValue &Result, SDValue &Chain, SelectionDAG &DAG) const
	Expand float to UINT conversion.
bool	expandUINT_TO_FP (SDNode *N, SDValue &Result, SDValue &Chain, SelectionDAG &DAG) const
	Expand UINT(i64) to double(f64) conversion.
SDValue	expandFMINNUM_FMAXNUM (SDNode *N, SelectionDAG &DAG) const
	Expand fminnum/fmaxnum into fminnum_ieee/fmaxnum_ieee with quieted inputs.
SDValue	expandFMINIMUM_FMAXIMUM (SDNode *N, SelectionDAG &DAG) const
	Expand fminimum/fmaximum into multiple comparison with selects.
SDValue	expandFMINIMUMNUM_FMAXIMUMNUM (SDNode *N, SelectionDAG &DAG) const
	Expand fminimumnum/fmaximumnum into multiple comparison with selects.
SDValue	expandFP_TO_INT_SAT (SDNode *N, SelectionDAG &DAG) const
	Expand FP_TO_[US]INT_SAT into FP_TO_[US]INT and selects or min/max.
SDValue	expandRoundInexactToOdd (EVT ResultVT, SDValue Op, const SDLoc &DL, SelectionDAG &DAG) const
	Truncate Op to ResultVT.
SDValue	expandFP_ROUND (SDNode *Node, SelectionDAG &DAG) const
	Expand round(fp) to fp conversion.
SDValue	expandIS_FPCLASS (EVT ResultVT, SDValue Op, FPClassTest Test, SDNodeFlags Flags, const SDLoc &DL, SelectionDAG &DAG) const
	Expand check for floating point class.
SDValue	expandCTPOP (SDNode *N, SelectionDAG &DAG) const
	Expand CTPOP nodes.
SDValue	expandVPCTPOP (SDNode *N, SelectionDAG &DAG) const
	Expand VP_CTPOP nodes.
SDValue	expandCTLZ (SDNode *N, SelectionDAG &DAG) const
	Expand CTLZ/CTLZ_ZERO_UNDEF nodes.
SDValue	expandVPCTLZ (SDNode *N, SelectionDAG &DAG) const
	Expand VP_CTLZ/VP_CTLZ_ZERO_UNDEF nodes.
SDValue	CTTZTableLookup (SDNode *N, SelectionDAG &DAG, const SDLoc &DL, EVT VT, SDValue Op, unsigned NumBitsPerElt) const
	Expand CTTZ via Table Lookup.
SDValue	expandCTTZ (SDNode *N, SelectionDAG &DAG) const
	Expand CTTZ/CTTZ_ZERO_UNDEF nodes.
SDValue	expandVPCTTZ (SDNode *N, SelectionDAG &DAG) const
	Expand VP_CTTZ/VP_CTTZ_ZERO_UNDEF nodes.
SDValue	expandVPCTTZElements (SDNode *N, SelectionDAG &DAG) const
	Expand VP_CTTZ_ELTS/VP_CTTZ_ELTS_ZERO_UNDEF nodes.
SDValue	expandABS (SDNode *N, SelectionDAG &DAG, bool IsNegative=false) const
	Expand ABS nodes.
SDValue	expandABD (SDNode *N, SelectionDAG &DAG) const
	Expand ABDS/ABDU nodes.
SDValue	expandAVG (SDNode *N, SelectionDAG &DAG) const
	Expand vector/scalar AVGCEILS/AVGCEILU/AVGFLOORS/AVGFLOORU nodes.
SDValue	expandBSWAP (SDNode *N, SelectionDAG &DAG) const
	Expand BSWAP nodes.
SDValue	expandVPBSWAP (SDNode *N, SelectionDAG &DAG) const
	Expand VP_BSWAP nodes.
SDValue	expandBITREVERSE (SDNode *N, SelectionDAG &DAG) const
	Expand BITREVERSE nodes.
SDValue	expandVPBITREVERSE (SDNode *N, SelectionDAG &DAG) const
	Expand VP_BITREVERSE nodes.
std::pair< SDValue, SDValue >	scalarizeVectorLoad (LoadSDNode *LD, SelectionDAG &DAG) const
	Turn load of vector type into a load of the individual elements.
SDValue	scalarizeVectorStore (StoreSDNode *ST, SelectionDAG &DAG) const
std::pair< SDValue, SDValue >	expandUnalignedLoad (LoadSDNode *LD, SelectionDAG &DAG) const
	Expands an unaligned load to 2 half-size loads for an integer, and possibly more for vectors.
SDValue	expandUnalignedStore (StoreSDNode *ST, SelectionDAG &DAG) const
	Expands an unaligned store to 2 half-size stores for integer values, and possibly more for vectors.
SDValue	IncrementMemoryAddress (SDValue Addr, SDValue Mask, const SDLoc &DL, EVT DataVT, SelectionDAG &DAG, bool IsCompressedMemory) const
	Increments memory address Addr according to the type of the value DataVT that should be stored.
SDValue	getVectorElementPointer (SelectionDAG &DAG, SDValue VecPtr, EVT VecVT, SDValue Index) const
	Get a pointer to vector element Idx located in memory for a vector of type VecVT starting at a base address of VecPtr.
SDValue	getVectorSubVecPointer (SelectionDAG &DAG, SDValue VecPtr, EVT VecVT, EVT SubVecVT, SDValue Index) const
	Get a pointer to a sub-vector of type SubVecVT at index Idx located in memory for a vector of type VecVT starting at a base address of VecPtr.
SDValue	expandIntMINMAX (SDNode *Node, SelectionDAG &DAG) const
	Method for building the DAG expansion of ISD::[US][MIN|MAX].
SDValue	expandAddSubSat (SDNode *Node, SelectionDAG &DAG) const
	Method for building the DAG expansion of ISD::[US][ADD|SUB]SAT.
SDValue	expandCMP (SDNode *Node, SelectionDAG &DAG) const
	Method for building the DAG expansion of ISD::[US]CMP.
SDValue	expandShlSat (SDNode *Node, SelectionDAG &DAG) const
	Method for building the DAG expansion of ISD::[US]SHLSAT.
SDValue	expandFixedPointMul (SDNode *Node, SelectionDAG &DAG) const
	Method for building the DAG expansion of ISD::[U|S]MULFIX[SAT].
SDValue	expandFixedPointDiv (unsigned Opcode, const SDLoc &dl, SDValue LHS, SDValue RHS, unsigned Scale, SelectionDAG &DAG) const
	Method for building the DAG expansion of ISD::[US]DIVFIX[SAT].
void	expandUADDSUBO (SDNode *Node, SDValue &Result, SDValue &Overflow, SelectionDAG &DAG) const
	Method for building the DAG expansion of ISD::U(ADD|SUB)O.
void	expandSADDSUBO (SDNode *Node, SDValue &Result, SDValue &Overflow, SelectionDAG &DAG) const
	Method for building the DAG expansion of ISD::S(ADD|SUB)O.
bool	expandMULO (SDNode *Node, SDValue &Result, SDValue &Overflow, SelectionDAG &DAG) const
	Method for building the DAG expansion of ISD::[US]MULO.
void	forceExpandWideMUL (SelectionDAG &DAG, const SDLoc &dl, bool Signed, EVT WideVT, const SDValue LL, const SDValue LH, const SDValue RL, const SDValue RH, SDValue &Lo, SDValue &Hi) const
	forceExpandWideMUL - Unconditionally expand a MUL into either a libcall or brute force via a wide multiplication.
void	forceExpandWideMUL (SelectionDAG &DAG, const SDLoc &dl, bool Signed, const SDValue LHS, const SDValue RHS, SDValue &Lo, SDValue &Hi) const
	Same as above, but creates the upper halves of each operand by sign/zero-extending the operands.
SDValue	expandVecReduce (SDNode *Node, SelectionDAG &DAG) const
	Expand a VECREDUCE_* into an explicit calculation.
SDValue	expandVecReduceSeq (SDNode *Node, SelectionDAG &DAG) const
	Expand a VECREDUCE_SEQ_* into an explicit ordered calculation.
bool	expandREM (SDNode *Node, SDValue &Result, SelectionDAG &DAG) const
	Expand an SREM or UREM using SDIV/UDIV or SDIVREM/UDIVREM, if legal.
SDValue	expandVectorSplice (SDNode *Node, SelectionDAG &DAG) const
	Method for building the DAG expansion of ISD::VECTOR_SPLICE.
SDValue	expandVECTOR_COMPRESS (SDNode *Node, SelectionDAG &DAG) const
	Expand a vector VECTOR_COMPRESS into a sequence of extract element, store temporarily, advance store position, before re-loading the final vector.
bool	LegalizeSetCCCondCode (SelectionDAG &DAG, EVT VT, SDValue &LHS, SDValue &RHS, SDValue &CC, SDValue Mask, SDValue EVL, bool &NeedInvert, const SDLoc &dl, SDValue &Chain, bool IsSignaling=false) const
	Legalize a SETCC or VP_SETCC with given LHS and RHS and condition code CC on the current target.
virtual MachineBasicBlock *	EmitInstrWithCustomInserter (MachineInstr &MI, MachineBasicBlock *MBB) const
	This method should be implemented by targets that mark instructions with the 'usesCustomInserter' flag.
virtual void	AdjustInstrPostInstrSelection (MachineInstr &MI, SDNode *Node) const
	This method should be implemented by targets that mark instructions with the 'hasPostISelHook' flag.
virtual bool	useLoadStackGuardNode () const
	If this function returns true, SelectionDAGBuilder emits a LOAD_STACK_GUARD node when it is lowering Intrinsic::stackprotector.
virtual SDValue	emitStackGuardXorFP (SelectionDAG &DAG, SDValue Val, const SDLoc &DL) const
virtual SDValue	LowerToTLSEmulatedModel (const GlobalAddressSDNode *GA, SelectionDAG &DAG) const
	Lower TLS global address SDNode for target independent emulated TLS model.
virtual SDValue	expandIndirectJTBranch (const SDLoc &dl, SDValue Value, SDValue Addr, int JTI, SelectionDAG &DAG) const
	Expands target specific indirect branch for the case of JumpTable expansion.
SDValue	lowerCmpEqZeroToCtlzSrl (SDValue Op, SelectionDAG &DAG) const
virtual bool	isXAndYEqZeroPreferableToXAndYEqY (ISD::CondCode, EVT) const
Public Member Functions inherited from llvm::TargetLoweringBase
virtual void	markLibCallAttributes (MachineFunction *MF, unsigned CC, ArgListTy &Args) const
	TargetLoweringBase (const TargetMachine &TM)
	NOTE: The TargetMachine owns TLOF.
	TargetLoweringBase (const TargetLoweringBase &)=delete
TargetLoweringBase &	operator= (const TargetLoweringBase &)=delete
virtual	~TargetLoweringBase ()=default
bool	isStrictFPEnabled () const
	Return true if the target support strict float operation.
const TargetMachine &	getTargetMachine () const
virtual bool	useSoftFloat () const
virtual MVT	getPointerTy (const DataLayout &DL, uint32_t AS=0) const
	Return the pointer type for the given address space, defaults to the pointer type from the data layout.
virtual MVT	getPointerMemTy (const DataLayout &DL, uint32_t AS=0) const
	Return the in-memory pointer type for the given address space, defaults to the pointer type from the data layout.
MVT	getFrameIndexTy (const DataLayout &DL) const
	Return the type for frame index, which is determined by the alloca address space specified through the data layout.
MVT	getProgramPointerTy (const DataLayout &DL) const
	Return the type for code pointers, which is determined by the program address space specified through the data layout.
virtual MVT	getFenceOperandTy (const DataLayout &DL) const
	Return the type for operands of fence.
virtual MVT	getScalarShiftAmountTy (const DataLayout &, EVT) const
	Return the type to use for a scalar shift opcode, given the shifted amount type.
EVT	getShiftAmountTy (EVT LHSTy, const DataLayout &DL) const
	Returns the type for the shift amount of a shift opcode.
virtual LLVM_READONLY LLT	getPreferredShiftAmountTy (LLT ShiftValueTy) const
	Return the preferred type to use for a shift opcode, given the shifted amount type is ShiftValueTy.
virtual MVT	getVectorIdxTy (const DataLayout &DL) const
	Returns the type to be used for the index operand of: ISD::INSERT_VECTOR_ELT, ISD::EXTRACT_VECTOR_ELT, ISD::INSERT_SUBVECTOR, and ISD::EXTRACT_SUBVECTOR.
virtual MVT	getVPExplicitVectorLengthTy () const
	Returns the type to be used for the EVL/AVL operand of VP nodes: ISD::VP_ADD, ISD::VP_SUB, etc.
virtual MachineMemOperand::Flags	getTargetMMOFlags (const Instruction &I) const
	This callback is used to inspect load/store instructions and add target-specific MachineMemOperand flags to them.
virtual MachineMemOperand::Flags	getTargetMMOFlags (const MemSDNode &Node) const
	This callback is used to inspect load/store SDNode.
MachineMemOperand::Flags	getLoadMemOperandFlags (const LoadInst &LI, const DataLayout &DL, AssumptionCache *AC=nullptr, const TargetLibraryInfo *LibInfo=nullptr) const
MachineMemOperand::Flags	getStoreMemOperandFlags (const StoreInst &SI, const DataLayout &DL) const
MachineMemOperand::Flags	getAtomicMemOperandFlags (const Instruction &AI, const DataLayout &DL) const
virtual bool	isSelectSupported (SelectSupportKind) const
virtual bool	shouldExpandGetActiveLaneMask (EVT VT, EVT OpVT) const
	Return true if the @llvm.get.active.lane.mask intrinsic should be expanded using generic code in SelectionDAGBuilder.
virtual bool	shouldExpandGetVectorLength (EVT CountVT, unsigned VF, bool IsScalable) const
virtual bool	shouldExpandCttzElements (EVT VT) const
	Return true if the @llvm.experimental.cttz.elts intrinsic should be expanded using generic code in SelectionDAGBuilder.
unsigned	getBitWidthForCttzElements (Type *RetTy, ElementCount EC, bool ZeroIsPoison, const ConstantRange *VScaleRange) const
	Return the minimum number of bits required to hold the maximum possible number of trailing zero vector elements.
virtual bool	shouldReassociateReduction (unsigned RedOpc, EVT VT) const
virtual bool	reduceSelectOfFPConstantLoads (EVT CmpOpVT) const
	Return true if it is profitable to convert a select of FP constants into a constant pool load whose address depends on the select condition.
bool	hasMultipleConditionRegisters () const
	Return true if multiple condition registers are available.
bool	hasExtractBitsInsn () const
	Return true if the target has BitExtract instructions.
virtual TargetLoweringBase::LegalizeTypeAction	getPreferredVectorAction (MVT VT) const
	Return the preferred vector type legalization action.
virtual bool	softPromoteHalfType () const
virtual bool	useFPRegsForHalfType () const
virtual bool	shouldExpandBuildVectorWithShuffles (EVT, unsigned DefinedValues) const
virtual bool	isIntDivCheap (EVT VT, AttributeList Attr) const
	Return true if integer divide is usually cheaper than a sequence of several shifts, adds, and multiplies for this target.
virtual bool	hasStandaloneRem (EVT VT) const
	Return true if the target can handle a standalone remainder operation.
virtual bool	isFsqrtCheap (SDValue X, SelectionDAG &DAG) const
	Return true if SQRT(X) shouldn't be replaced with X*RSQRT(X).
int	getRecipEstimateSqrtEnabled (EVT VT, MachineFunction &MF) const
	Return a ReciprocalEstimate enum value for a square root of the given type based on the function's attributes.
int	getRecipEstimateDivEnabled (EVT VT, MachineFunction &MF) const
	Return a ReciprocalEstimate enum value for a division of the given type based on the function's attributes.
int	getSqrtRefinementSteps (EVT VT, MachineFunction &MF) const
	Return the refinement step count for a square root of the given type based on the function's attributes.
int	getDivRefinementSteps (EVT VT, MachineFunction &MF) const
	Return the refinement step count for a division of the given type based on the function's attributes.
bool	isSlowDivBypassed () const
	Returns true if target has indicated at least one type should be bypassed.
const DenseMap< unsigned int, unsigned int > &	getBypassSlowDivWidths () const
	Returns map of slow types for division or remainder with corresponding fast types.
virtual bool	isVScaleKnownToBeAPowerOfTwo () const
	Return true only if vscale must be a power of two.
bool	isJumpExpensive () const
	Return true if Flow Control is an expensive operation that should be avoided.
virtual CondMergingParams	getJumpConditionMergingParams (Instruction::BinaryOps, const Value *, const Value *) const
bool	isPredictableSelectExpensive () const
	Return true if selects are only cheaper than branches if the branch is unlikely to be predicted right.
virtual bool	fallBackToDAGISel (const Instruction &Inst) const
virtual bool	isLoadBitCastBeneficial (EVT LoadVT, EVT BitcastVT, const SelectionDAG &DAG, const MachineMemOperand &MMO) const
	Return true if the following transform is beneficial: fold (conv (load x)) -> (load (conv*)x) On architectures that don't natively support some vector loads efficiently, casting the load to a smaller vector of larger types and loading is more efficient, however, this can be undone by optimizations in dag combiner.
virtual bool	isStoreBitCastBeneficial (EVT StoreVT, EVT BitcastVT, const SelectionDAG &DAG, const MachineMemOperand &MMO) const
	Return true if the following transform is beneficial: (store (y (conv x)), y*)) -> (store x, (x*))
virtual bool	storeOfVectorConstantIsCheap (bool IsZero, EVT MemVT, unsigned NumElem, unsigned AddrSpace) const
	Return true if it is expected to be cheaper to do a store of vector constant with the given size and type for the address space than to store the individual scalar element constants.
virtual bool	mergeStoresAfterLegalization (EVT MemVT) const
	Allow store merging for the specified type after legalization in addition to before legalization.
virtual bool	canMergeStoresTo (unsigned AS, EVT MemVT, const MachineFunction &MF) const
	Returns if it's reasonable to merge stores to MemVT size.
virtual bool	isCheapToSpeculateCttz (Type *Ty) const
	Return true if it is cheap to speculate a call to intrinsic cttz.
virtual bool	isCheapToSpeculateCtlz (Type *Ty) const
	Return true if it is cheap to speculate a call to intrinsic ctlz.
virtual bool	isCtlzFast () const
	Return true if ctlz instruction is fast.
virtual bool	isCtpopFast (EVT VT) const
	Return true if ctpop instruction is fast.
virtual unsigned	getCustomCtpopCost (EVT VT, ISD::CondCode Cond) const
	Return the maximum number of "x & (x - 1)" operations that can be done instead of deferring to a custom CTPOP.
virtual bool	isEqualityCmpFoldedWithSignedCmp () const
	Return true if instruction generated for equality comparison is folded with instruction generated for signed comparison.
virtual bool	preferZeroCompareBranch () const
	Return true if the heuristic to prefer icmp eq zero should be used in code gen prepare.
virtual bool	isMultiStoresCheaperThanBitsMerge (EVT LTy, EVT HTy) const
	Return true if it is cheaper to split the store of a merged int val from a pair of smaller values into multiple stores.
virtual bool	isMaskAndCmp0FoldingBeneficial (const Instruction &AndI) const
	Return if the target supports combining a chain like:
virtual bool	areTwoSDNodeTargetMMOFlagsMergeable (const MemSDNode &NodeX, const MemSDNode &NodeY) const
	Return true if it is valid to merge the TargetMMOFlags in two SDNodes.
virtual bool	convertSetCCLogicToBitwiseLogic (EVT VT) const
	Use bitwise logic to make pairs of compares more efficient.
virtual MVT	hasFastEqualityCompare (unsigned NumBits) const
	Return the preferred operand type if the target has a quick way to compare integer values of the given size.
virtual bool	hasAndNotCompare (SDValue Y) const
	Return true if the target should transform: (X & Y) == Y —> (~X & Y) == 0 (X & Y) != Y —> (~X & Y) != 0.
virtual bool	hasAndNot (SDValue X) const
	Return true if the target has a bitwise and-not operation: X = ~A & B This can be used to simplify select or other instructions.
virtual bool	hasBitTest (SDValue X, SDValue Y) const
	Return true if the target has a bit-test instruction: (X & (1 << Y)) ==/!= 0 This knowledge can be used to prevent breaking the pattern, or creating it if it could be recognized.
virtual bool	shouldFoldMaskToVariableShiftPair (SDValue X) const
	There are two ways to clear extreme bits (either low or high): Mask: x & (-1 << y) (the instcombine canonical form) Shifts: x >> y << y Return true if the variant with 2 variable shifts is preferred.
virtual bool	shouldFoldConstantShiftPairToMask (const SDNode *N, CombineLevel Level) const
	Return true if it is profitable to fold a pair of shifts into a mask.
virtual bool	shouldTransformSignedTruncationCheck (EVT XVT, unsigned KeptBits) const
	Should we tranform the IR-optimal check for whether given truncation down into KeptBits would be truncating or not: (add x, (1 << (KeptBits-1))) srccond (1 << KeptBits) Into it's more traditional form: ((x << C) a>> C) dstcond x Return true if we should transform.
virtual bool	shouldProduceAndByConstByHoistingConstFromShiftsLHSOfAnd (SDValue X, ConstantSDNode *XC, ConstantSDNode *CC, SDValue Y, unsigned OldShiftOpcode, unsigned NewShiftOpcode, SelectionDAG &DAG) const
	Given the pattern (X & (C l>>/<< Y)) ==/!= 0 return true if it should be transformed into: ((X <</l>> Y) & C) ==/!= 0 WARNING: if 'X' is a constant, the fold may deadlock! FIXME: we could avoid passing XC, but we can't use isConstOrConstSplat() here because it can end up being not linked in.
virtual bool	optimizeFMulOrFDivAsShiftAddBitcast (SDNode *N, SDValue FPConst, SDValue IntPow2) const
virtual unsigned	preferedOpcodeForCmpEqPiecesOfOperand (EVT VT, unsigned ShiftOpc, bool MayTransformRotate, const APInt &ShiftOrRotateAmt, const std::optional< APInt > &AndMask) const
virtual bool	preferIncOfAddToSubOfNot (EVT VT) const
	These two forms are equivalent: sub y, (xor x, -1) add (add x, 1), y The variant with two add's is IR-canonical.
virtual bool	preferABDSToABSWithNSW (EVT VT) const
virtual bool	preferScalarizeSplat (SDNode *N) const
virtual bool	preferSextInRegOfTruncate (EVT TruncVT, EVT VT, EVT ExtVT) const
bool	enableExtLdPromotion () const
	Return true if the target wants to use the optimization that turns ext(promotableInst1(...(promotableInstN(load)))) into promotedInst1(...(promotedInstN(ext(load)))).
virtual bool	canCombineStoreAndExtract (Type *VectorTy, Value *Idx, unsigned &Cost) const
	Return true if the target can combine store(extractelement VectorTy, Idx).
virtual bool	shallExtractConstSplatVectorElementToStore (Type *VectorTy, unsigned ElemSizeInBits, unsigned &Index) const
	Return true if the target shall perform extract vector element and store given that the vector is known to be splat of constant.
virtual bool	shouldSplatInsEltVarIndex (EVT) const
	Return true if inserting a scalar into a variable element of an undef vector is more efficiently handled by splatting the scalar instead.
virtual bool	enableAggressiveFMAFusion (EVT VT) const
	Return true if target always benefits from combining into FMA for a given value type.
virtual bool	enableAggressiveFMAFusion (LLT Ty) const
	Return true if target always benefits from combining into FMA for a given value type.
virtual EVT	getSetCCResultType (const DataLayout &DL, LLVMContext &Context, EVT VT) const
	Return the ValueType of the result of SETCC operations.
virtual MVT::SimpleValueType	getCmpLibcallReturnType () const
	Return the ValueType for comparison libcalls.
BooleanContent	getBooleanContents (bool isVec, bool isFloat) const
	For targets without i1 registers, this gives the nature of the high-bits of boolean values held in types wider than i1.
BooleanContent	getBooleanContents (EVT Type) const
SDValue	promoteTargetBoolean (SelectionDAG &DAG, SDValue Bool, EVT ValVT) const
	Promote the given target boolean to a target boolean of the given type.
Sched::Preference	getSchedulingPreference () const
	Return target scheduling preference.
virtual Sched::Preference	getSchedulingPreference (SDNode *) const
	Some scheduler, e.g.
virtual const TargetRegisterClass *	getRegClassFor (MVT VT, bool isDivergent=false) const
	Return the register class that should be used for the specified value type.
virtual bool	requiresUniformRegister (MachineFunction &MF, const Value *) const
	Allows target to decide about the register class of the specific value that is live outside the defining block.
virtual const TargetRegisterClass *	getRepRegClassFor (MVT VT) const
	Return the 'representative' register class for the specified value type.
virtual uint8_t	getRepRegClassCostFor (MVT VT) const
	Return the cost of the 'representative' register class for the specified value type.
virtual ShiftLegalizationStrategy	preferredShiftLegalizationStrategy (SelectionDAG &DAG, SDNode *N, unsigned ExpansionFactor) const
bool	isTypeLegal (EVT VT) const
	Return true if the target has native support for the specified value type.
const ValueTypeActionImpl &	getValueTypeActions () const
LegalizeKind	getTypeConversion (LLVMContext &Context, EVT VT) const
	Return pair that represents the legalization kind (first) that needs to happen to EVT (second) in order to type-legalize it.
LegalizeTypeAction	getTypeAction (LLVMContext &Context, EVT VT) const
	Return how we should legalize values of this type, either it is already legal (return 'Legal') or we need to promote it to a larger type (return 'Promote'), or we need to expand it into multiple registers of smaller integer type (return 'Expand').
LegalizeTypeAction	getTypeAction (MVT VT) const
virtual EVT	getTypeToTransformTo (LLVMContext &Context, EVT VT) const
	For types supported by the target, this is an identity function.
EVT	getTypeToExpandTo (LLVMContext &Context, EVT VT) const
	For types supported by the target, this is an identity function.
unsigned	getVectorTypeBreakdown (LLVMContext &Context, EVT VT, EVT &IntermediateVT, unsigned &NumIntermediates, MVT &RegisterVT) const
	Vector types are broken down into some number of legal first class types.
virtual unsigned	getVectorTypeBreakdownForCallingConv (LLVMContext &Context, CallingConv::ID CC, EVT VT, EVT &IntermediateVT, unsigned &NumIntermediates, MVT &RegisterVT) const
	Certain targets such as MIPS require that some types such as vectors are always broken down into scalars in some contexts.
virtual bool	getTgtMemIntrinsic (IntrinsicInfo &, const CallInst &, MachineFunction &, unsigned) const
	Given an intrinsic, checks if on the target the intrinsic will need to map to a MemIntrinsicNode (touches memory).
virtual bool	isFPImmLegal (const APFloat &, EVT, bool ForCodeSize=false) const
	Returns true if the target can instruction select the specified FP immediate natively.
virtual bool	isShuffleMaskLegal (ArrayRef< int >, EVT) const
	Targets can use this to indicate that they only support some VECTOR_SHUFFLE operations, those with specific masks.
virtual bool	canOpTrap (unsigned Op, EVT VT) const
	Returns true if the operation can trap for the value type.
virtual bool	isVectorClearMaskLegal (ArrayRef< int >, EVT) const
	Similar to isShuffleMaskLegal.
virtual LegalizeAction	getCustomOperationAction (SDNode &Op) const
	How to legalize this custom operation?
LegalizeAction	getOperationAction (unsigned Op, EVT VT) const
	Return how this operation should be treated: either it is legal, needs to be promoted to a larger size, needs to be expanded to some other code sequence, or the target has a custom expander for it.
virtual bool	isSupportedFixedPointOperation (unsigned Op, EVT VT, unsigned Scale) const
	Custom method defined by each target to indicate if an operation which may require a scale is supported natively by the target.
LegalizeAction	getFixedPointOperationAction (unsigned Op, EVT VT, unsigned Scale) const
	Some fixed point operations may be natively supported by the target but only for specific scales.
LegalizeAction	getStrictFPOperationAction (unsigned Op, EVT VT) const
bool	isOperationLegalOrCustom (unsigned Op, EVT VT, bool LegalOnly=false) const
	Return true if the specified operation is legal on this target or can be made legal with custom lowering.
bool	isOperationLegalOrPromote (unsigned Op, EVT VT, bool LegalOnly=false) const
	Return true if the specified operation is legal on this target or can be made legal using promotion.
bool	isOperationLegalOrCustomOrPromote (unsigned Op, EVT VT, bool LegalOnly=false) const
	Return true if the specified operation is legal on this target or can be made legal with custom lowering or using promotion.
bool	isOperationCustom (unsigned Op, EVT VT) const
	Return true if the operation uses custom lowering, regardless of whether the type is legal or not.
virtual bool	areJTsAllowed (const Function *Fn) const
	Return true if lowering to a jump table is allowed.
bool	rangeFitsInWord (const APInt &Low, const APInt &High, const DataLayout &DL) const
	Check whether the range [Low,High] fits in a machine word.
virtual bool	isSuitableForJumpTable (const SwitchInst *SI, uint64_t NumCases, uint64_t Range, ProfileSummaryInfo *PSI, BlockFrequencyInfo *BFI) const
	Return true if lowering to a jump table is suitable for a set of case clusters which may contain NumCases cases, Range range of values.
virtual MVT	getPreferredSwitchConditionType (LLVMContext &Context, EVT ConditionVT) const
	Returns preferred type for switch condition.
bool	isSuitableForBitTests (unsigned NumDests, unsigned NumCmps, const APInt &Low, const APInt &High, const DataLayout &DL) const
	Return true if lowering to a bit test is suitable for a set of case clusters which contains NumDests unique destinations, Low and High as its lowest and highest case values, and expects NumCmps case value comparisons.
bool	isOperationExpand (unsigned Op, EVT VT) const
	Return true if the specified operation is illegal on this target or unlikely to be made legal with custom lowering.
bool	isOperationLegal (unsigned Op, EVT VT) const
	Return true if the specified operation is legal on this target.
LegalizeAction	getLoadExtAction (unsigned ExtType, EVT ValVT, EVT MemVT) const
	Return how this load with extension should be treated: either it is legal, needs to be promoted to a larger size, needs to be expanded to some other code sequence, or the target has a custom expander for it.
bool	isLoadExtLegal (unsigned ExtType, EVT ValVT, EVT MemVT) const
	Return true if the specified load with extension is legal on this target.
bool	isLoadExtLegalOrCustom (unsigned ExtType, EVT ValVT, EVT MemVT) const
	Return true if the specified load with extension is legal or custom on this target.
LegalizeAction	getAtomicLoadExtAction (unsigned ExtType, EVT ValVT, EVT MemVT) const
	Same as getLoadExtAction, but for atomic loads.
bool	isAtomicLoadExtLegal (unsigned ExtType, EVT ValVT, EVT MemVT) const
	Return true if the specified atomic load with extension is legal on this target.
LegalizeAction	getTruncStoreAction (EVT ValVT, EVT MemVT) const
	Return how this store with truncation should be treated: either it is legal, needs to be promoted to a larger size, needs to be expanded to some other code sequence, or the target has a custom expander for it.
bool	isTruncStoreLegal (EVT ValVT, EVT MemVT) const
	Return true if the specified store with truncation is legal on this target.
bool	isTruncStoreLegalOrCustom (EVT ValVT, EVT MemVT) const
	Return true if the specified store with truncation has solution on this target.
virtual bool	canCombineTruncStore (EVT ValVT, EVT MemVT, bool LegalOnly) const
LegalizeAction	getIndexedLoadAction (unsigned IdxMode, MVT VT) const
	Return how the indexed load should be treated: either it is legal, needs to be promoted to a larger size, needs to be expanded to some other code sequence, or the target has a custom expander for it.
bool	isIndexedLoadLegal (unsigned IdxMode, EVT VT) const
	Return true if the specified indexed load is legal on this target.
LegalizeAction	getIndexedStoreAction (unsigned IdxMode, MVT VT) const
	Return how the indexed store should be treated: either it is legal, needs to be promoted to a larger size, needs to be expanded to some other code sequence, or the target has a custom expander for it.
bool	isIndexedStoreLegal (unsigned IdxMode, EVT VT) const
	Return true if the specified indexed load is legal on this target.
LegalizeAction	getIndexedMaskedLoadAction (unsigned IdxMode, MVT VT) const
	Return how the indexed load should be treated: either it is legal, needs to be promoted to a larger size, needs to be expanded to some other code sequence, or the target has a custom expander for it.
bool	isIndexedMaskedLoadLegal (unsigned IdxMode, EVT VT) const
	Return true if the specified indexed load is legal on this target.
LegalizeAction	getIndexedMaskedStoreAction (unsigned IdxMode, MVT VT) const
	Return how the indexed store should be treated: either it is legal, needs to be promoted to a larger size, needs to be expanded to some other code sequence, or the target has a custom expander for it.
bool	isIndexedMaskedStoreLegal (unsigned IdxMode, EVT VT) const
	Return true if the specified indexed load is legal on this target.
virtual bool	shouldExtendGSIndex (EVT VT, EVT &EltTy) const
	Returns true if the index type for a masked gather/scatter requires extending.
virtual bool	shouldRemoveExtendFromGSIndex (SDValue Extend, EVT DataVT) const
virtual bool	isLegalScaleForGatherScatter (uint64_t Scale, uint64_t ElemSize) const
LegalizeAction	getCondCodeAction (ISD::CondCode CC, MVT VT) const
	Return how the condition code should be treated: either it is legal, needs to be expanded to some other code sequence, or the target has a custom expander for it.
bool	isCondCodeLegal (ISD::CondCode CC, MVT VT) const
	Return true if the specified condition code is legal on this target.
bool	isCondCodeLegalOrCustom (ISD::CondCode CC, MVT VT) const
	Return true if the specified condition code is legal or custom on this target.
MVT	getTypeToPromoteTo (unsigned Op, MVT VT) const
	If the action for this operation is to promote, this method returns the ValueType to promote to.
virtual EVT	getAsmOperandValueType (const DataLayout &DL, Type *Ty, bool AllowUnknown=false) const
EVT	getValueType (const DataLayout &DL, Type *Ty, bool AllowUnknown=false) const
	Return the EVT corresponding to this LLVM type.
EVT	getMemValueType (const DataLayout &DL, Type *Ty, bool AllowUnknown=false) const
MVT	getSimpleValueType (const DataLayout &DL, Type *Ty, bool AllowUnknown=false) const
	Return the MVT corresponding to this LLVM type. See getValueType.
virtual uint64_t	getByValTypeAlignment (Type *Ty, const DataLayout &DL) const
	Return the desired alignment for ByVal or InAlloca aggregate function arguments in the caller parameter area.
MVT	getRegisterType (MVT VT) const
	Return the type of registers that this ValueType will eventually require.
MVT	getRegisterType (LLVMContext &Context, EVT VT) const
	Return the type of registers that this ValueType will eventually require.
virtual unsigned	getNumRegisters (LLVMContext &Context, EVT VT, std::optional< MVT > RegisterVT=std::nullopt) const
	Return the number of registers that this ValueType will eventually require.
virtual MVT	getRegisterTypeForCallingConv (LLVMContext &Context, CallingConv::ID CC, EVT VT) const
	Certain combinations of ABIs, Targets and features require that types are legal for some operations and not for other operations.
virtual unsigned	getNumRegistersForCallingConv (LLVMContext &Context, CallingConv::ID CC, EVT VT) const
	Certain targets require unusual breakdowns of certain types.
virtual Align	getABIAlignmentForCallingConv (Type *ArgTy, const DataLayout &DL) const
	Certain targets have context sensitive alignment requirements, where one type has the alignment requirement of another type.
virtual bool	ShouldShrinkFPConstant (EVT) const
	If true, then instruction selection should seek to shrink the FP constant of the specified type to a smaller type in order to save space and / or reduce runtime.
virtual bool	shouldReduceLoadWidth (SDNode *Load, ISD::LoadExtType ExtTy, EVT NewVT) const
	Return true if it is profitable to reduce a load to a smaller type.
virtual bool	shouldRemoveRedundantExtend (SDValue Op) const
	Return true (the default) if it is profitable to remove a sext_inreg(x) where the sext is redundant, and use x directly.
bool	isPaddedAtMostSignificantBitsWhenStored (EVT VT) const
	Indicates if any padding is guaranteed to go at the most significant bits when storing the type to memory and the type size isn't equal to the store size.
bool	hasBigEndianPartOrdering (EVT VT, const DataLayout &DL) const
	When splitting a value of the specified type into parts, does the Lo or Hi part come first? This usually follows the endianness, except for ppcf128, where the Hi part always comes first.
bool	hasTargetDAGCombine (ISD::NodeType NT) const
	If true, the target has custom DAG combine transformations that it can perform for the specified node.
unsigned	getGatherAllAliasesMaxDepth () const
virtual unsigned	getVaListSizeInBits (const DataLayout &DL) const
	Returns the size of the platform's va_list object.
unsigned	getMaxStoresPerMemset (bool OptSize) const
	Get maximum # of store operations permitted for llvm.memset.
unsigned	getMaxStoresPerMemcpy (bool OptSize) const
	Get maximum # of store operations permitted for llvm.memcpy.
virtual unsigned	getMaxGluedStoresPerMemcpy () const
	Get maximum # of store operations to be glued together.
unsigned	getMaxExpandSizeMemcmp (bool OptSize) const
	Get maximum # of load operations permitted for memcmp.
unsigned	getMaxStoresPerMemmove (bool OptSize) const
	Get maximum # of store operations permitted for llvm.memmove.
virtual bool	allowsMisalignedMemoryAccesses (EVT, unsigned AddrSpace=0, Align Alignment=Align(1), MachineMemOperand::Flags Flags=MachineMemOperand::MONone, unsigned *=nullptr) const
	Determine if the target supports unaligned memory accesses.
virtual bool	allowsMisalignedMemoryAccesses (LLT, unsigned AddrSpace=0, Align Alignment=Align(1), MachineMemOperand::Flags Flags=MachineMemOperand::MONone, unsigned *=nullptr) const
	LLT handling variant.
bool	allowsMemoryAccessForAlignment (LLVMContext &Context, const DataLayout &DL, EVT VT, unsigned AddrSpace=0, Align Alignment=Align(1), MachineMemOperand::Flags Flags=MachineMemOperand::MONone, unsigned *Fast=nullptr) const
	This function returns true if the memory access is aligned or if the target allows this specific unaligned memory access.
bool	allowsMemoryAccessForAlignment (LLVMContext &Context, const DataLayout &DL, EVT VT, const MachineMemOperand &MMO, unsigned *Fast=nullptr) const
	Return true if the memory access of this type is aligned or if the target allows this specific unaligned access for the given MachineMemOperand.
virtual bool	allowsMemoryAccess (LLVMContext &Context, const DataLayout &DL, EVT VT, unsigned AddrSpace=0, Align Alignment=Align(1), MachineMemOperand::Flags Flags=MachineMemOperand::MONone, unsigned *Fast=nullptr) const
	Return true if the target supports a memory access of this type for the given address space and alignment.
bool	allowsMemoryAccess (LLVMContext &Context, const DataLayout &DL, EVT VT, const MachineMemOperand &MMO, unsigned *Fast=nullptr) const
	Return true if the target supports a memory access of this type for the given MachineMemOperand.
bool	allowsMemoryAccess (LLVMContext &Context, const DataLayout &DL, LLT Ty, const MachineMemOperand &MMO, unsigned *Fast=nullptr) const
	LLT handling variant.
virtual EVT	getOptimalMemOpType (const MemOp &Op, const AttributeList &) const
	Returns the target specific optimal type for load and store operations as a result of memset, memcpy, and memmove lowering.
virtual LLT	getOptimalMemOpLLT (const MemOp &Op, const AttributeList &) const
	LLT returning variant.
virtual bool	isSafeMemOpType (MVT) const
	Returns true if it's safe to use load / store of the specified type to expand memcpy / memset inline.
virtual unsigned	getMinimumJumpTableEntries () const
	Return lower limit for number of blocks in a jump table.
unsigned	getMinimumJumpTableDensity (bool OptForSize) const
	Return lower limit of the density in a jump table.
unsigned	getMaximumJumpTableSize () const
	Return upper limit for number of entries in a jump table.
virtual bool	isJumpTableRelative () const
Register	getStackPointerRegisterToSaveRestore () const
	If a physical register, this specifies the register that llvm.savestack/llvm.restorestack should save and restore.
virtual Register	getExceptionPointerRegister (const Constant *PersonalityFn) const
	If a physical register, this returns the register that receives the exception address on entry to an EH pad.
virtual Register	getExceptionSelectorRegister (const Constant *PersonalityFn) const
	If a physical register, this returns the register that receives the exception typeid on entry to a landing pad.
virtual bool	needsFixedCatchObjects () const
Align	getMinStackArgumentAlignment () const
	Return the minimum stack alignment of an argument.
Align	getMinFunctionAlignment () const
	Return the minimum function alignment.
Align	getPrefFunctionAlignment () const
	Return the preferred function alignment.
virtual Align	getPrefLoopAlignment (MachineLoop *ML=nullptr) const
	Return the preferred loop alignment.
virtual unsigned	getMaxPermittedBytesForAlignment (MachineBasicBlock *MBB) const
	Return the maximum amount of bytes allowed to be emitted when padding for alignment.
virtual bool	alignLoopsWithOptSize () const
	Should loops be aligned even when the function is marked OptSize (but not MinSize).
virtual Value *	getIRStackGuard (IRBuilderBase &IRB) const
	If the target has a standard location for the stack protector guard, returns the address of that location.
virtual void	insertSSPDeclarations (Module &M) const
	Inserts necessary declarations for SSP (stack protection) purpose.
virtual Value *	getSDagStackGuard (const Module &M) const
	Return the variable that's previously inserted by insertSSPDeclarations, if any, otherwise return nullptr.
virtual bool	useStackGuardXorFP () const
	If this function returns true, stack protection checks should XOR the frame pointer (or whichever pointer is used to address locals) into the stack guard value before checking it.
virtual Function *	getSSPStackGuardCheck (const Module &M) const
	If the target has a standard stack protection check function that performs validation and error handling, returns the function.
virtual Value *	getSafeStackPointerLocation (IRBuilderBase &IRB) const
	Returns the target-specific address of the unsafe stack pointer.
virtual bool	hasStackProbeSymbol (const MachineFunction &MF) const
	Returns the name of the symbol used to emit stack probes or the empty string if not applicable.
virtual bool	hasInlineStackProbe (const MachineFunction &MF) const
virtual StringRef	getStackProbeSymbolName (const MachineFunction &MF) const
virtual bool	isFreeAddrSpaceCast (unsigned SrcAS, unsigned DestAS) const
	Returns true if a cast from SrcAS to DestAS is "cheap", such that e.g.
virtual bool	shouldAlignPointerArgs (CallInst *, unsigned &, Align &) const
	Return true if the pointer arguments to CI should be aligned by aligning the object whose address is being passed.
virtual void	emitAtomicCmpXchgNoStoreLLBalance (IRBuilderBase &Builder) const
virtual bool	shouldSignExtendTypeInLibCall (EVT Type, bool IsSigned) const
	Returns true if arguments should be sign-extended in lib calls.
virtual bool	shouldExtendTypeInLibCall (EVT Type) const
	Returns true if arguments should be extended in lib calls.
virtual AtomicExpansionKind	shouldExpandAtomicLoadInIR (LoadInst *LI) const
	Returns how the given (atomic) load should be expanded by the IR-level AtomicExpand pass.
virtual AtomicExpansionKind	shouldCastAtomicLoadInIR (LoadInst *LI) const
	Returns how the given (atomic) load should be cast by the IR-level AtomicExpand pass.
virtual AtomicExpansionKind	shouldExpandAtomicStoreInIR (StoreInst *SI) const
	Returns how the given (atomic) store should be expanded by the IR-level AtomicExpand pass into.
virtual AtomicExpansionKind	shouldCastAtomicStoreInIR (StoreInst *SI) const
	Returns how the given (atomic) store should be cast by the IR-level AtomicExpand pass into.
virtual AtomicExpansionKind	shouldExpandAtomicCmpXchgInIR (AtomicCmpXchgInst *AI) const
	Returns how the given atomic cmpxchg should be expanded by the IR-level AtomicExpand pass.
virtual AtomicExpansionKind	shouldExpandAtomicRMWInIR (AtomicRMWInst *RMW) const
	Returns how the IR-level AtomicExpand pass should expand the given AtomicRMW, if at all.
virtual AtomicExpansionKind	shouldCastAtomicRMWIInIR (AtomicRMWInst *RMWI) const
	Returns how the given atomic atomicrmw should be cast by the IR-level AtomicExpand pass.
virtual LoadInst *	lowerIdempotentRMWIntoFencedLoad (AtomicRMWInst *RMWI) const
	On some platforms, an AtomicRMW that never actually modifies the value (such as fetch_add of 0) can be turned into a fence followed by an atomic load.
virtual ISD::NodeType	getExtendForAtomicOps () const
	Returns how the platform's atomic operations are extended (ZERO_EXTEND, SIGN_EXTEND, or ANY_EXTEND).
virtual ISD::NodeType	getExtendForAtomicCmpSwapArg () const
	Returns how the platform's atomic compare and swap expects its comparison value to be extended (ZERO_EXTEND, SIGN_EXTEND, or ANY_EXTEND).
virtual bool	shouldNormalizeToSelectSequence (LLVMContext &Context, EVT VT) const
	Returns true if we should normalize select(N0&N1, X, Y) => select(N0, select(N1, X, Y), Y) and select(N0|N1, X, Y) => select(N0, select(N1, X, Y, Y)) if it is likely that it saves us from materializing N0 and N1 in an integer register.
virtual bool	isProfitableToCombineMinNumMaxNum (EVT VT) const
virtual bool	convertSelectOfConstantsToMath (EVT VT) const
	Return true if a select of constants (select Cond, C1, C2) should be transformed into simple math ops with the condition value.
virtual bool	decomposeMulByConstant (LLVMContext &Context, EVT VT, SDValue C) const
	Return true if it is profitable to transform an integer multiplication-by-constant into simpler operations like shifts and adds.
virtual bool	isMulAddWithConstProfitable (SDValue AddNode, SDValue ConstNode) const
	Return true if it may be profitable to transform (mul (add x, c1), c2) -> (add (mul x, c2), c1*c2).
virtual bool	shouldUseStrictFP_TO_INT (EVT FpVT, EVT IntVT, bool IsSigned) const
	Return true if it is more correct/profitable to use strict FP_TO_INT conversion operations - canonicalizing the FP source value instead of converting all cases and then selecting based on value.
bool	isBeneficialToExpandPowI (int64_t Exponent, bool OptForSize) const
	Return true if it is beneficial to expand an @llvm.powi.
virtual bool	getAddrModeArguments (IntrinsicInst *, SmallVectorImpl< Value * > &, Type *&) const
	CodeGenPrepare sinks address calculations into the same BB as Load/Store instructions reading the address.
virtual bool	isLegalAddressingMode (const DataLayout &DL, const AddrMode &AM, Type *Ty, unsigned AddrSpace, Instruction *I=nullptr) const
	Return true if the addressing mode represented by AM is legal for this target, for a load/store of the specified type.
virtual bool	addressingModeSupportsTLS (const GlobalValue &) const
	Returns true if the targets addressing mode can target thread local storage (TLS).
virtual int64_t	getPreferredLargeGEPBaseOffset (int64_t MinOffset, int64_t MaxOffset) const
	Return the prefered common base offset.
virtual bool	isLegalICmpImmediate (int64_t) const
	Return true if the specified immediate is legal icmp immediate, that is the target has icmp instructions which can compare a register against the immediate without having to materialize the immediate into a register.
virtual bool	isLegalAddImmediate (int64_t) const
	Return true if the specified immediate is legal add immediate, that is the target has add instructions which can add a register with the immediate without having to materialize the immediate into a register.
virtual bool	isLegalAddScalableImmediate (int64_t) const
	Return true if adding the specified scalable immediate is legal, that is the target has add instructions which can add a register with the immediate (multiplied by vscale) without having to materialize the immediate into a register.
virtual bool	isLegalStoreImmediate (int64_t Value) const
	Return true if the specified immediate is legal for the value input of a store instruction.
virtual bool	isVectorShiftByScalarCheap (Type *Ty) const
	Return true if it's significantly cheaper to shift a vector by a uniform scalar than by an amount which will vary across each lane.
virtual Type *	shouldConvertSplatType (ShuffleVectorInst *SVI) const
	Given a shuffle vector SVI representing a vector splat, return a new scalar type of size equal to SVI's scalar type if the new type is more profitable.
virtual bool	shouldConvertPhiType (Type *From, Type *To) const
	Given a set in interconnected phis of type 'From' that are loaded/stored or bitcast to type 'To', return true if the set should be converted to 'To'.
virtual bool	isCommutativeBinOp (unsigned Opcode) const
	Returns true if the opcode is a commutative binary operation.
virtual bool	isBinOp (unsigned Opcode) const
	Return true if the node is a math/logic binary operator.
virtual bool	isTruncateFree (Type *FromTy, Type *ToTy) const
	Return true if it's free to truncate a value of type FromTy to type ToTy.
virtual bool	allowTruncateForTailCall (Type *FromTy, Type *ToTy) const
	Return true if a truncation from FromTy to ToTy is permitted when deciding whether a call is in tail position.
virtual bool	isTruncateFree (EVT FromVT, EVT ToVT) const
virtual bool	isTruncateFree (LLT FromTy, LLT ToTy, const DataLayout &DL, LLVMContext &Ctx) const
virtual bool	isTruncateFree (SDValue Val, EVT VT2) const
	Return true if truncating the specific node Val to type VT2 is free.
virtual bool	isProfitableToHoist (Instruction *I) const
bool	isExtFree (const Instruction *I) const
	Return true if the extension represented by I is free.
bool	isExtLoad (const LoadInst *Load, const Instruction *Ext, const DataLayout &DL) const
	Return true if Load and Ext can form an ExtLoad.
virtual bool	isZExtFree (Type *FromTy, Type *ToTy) const
	Return true if any actual instruction that defines a value of type FromTy implicitly zero-extends the value to ToTy in the result register.
virtual bool	isZExtFree (EVT FromTy, EVT ToTy) const
virtual bool	isZExtFree (LLT FromTy, LLT ToTy, const DataLayout &DL, LLVMContext &Ctx) const
virtual bool	isZExtFree (SDValue Val, EVT VT2) const
	Return true if zero-extending the specific node Val to type VT2 is free (either because it's implicitly zero-extended such as ARM ldrb / ldrh or because it's folded such as X86 zero-extending loads).
virtual bool	isSExtCheaperThanZExt (EVT FromTy, EVT ToTy) const
	Return true if sign-extension from FromTy to ToTy is cheaper than zero-extension.
virtual bool	signExtendConstant (const ConstantInt *C) const
	Return true if this constant should be sign extended when promoting to a larger type.
virtual bool	shouldSinkOperands (Instruction *I, SmallVectorImpl< Use * > &Ops) const
	Return true if sinking I's operands to the same basic block as I is profitable, e.g.
virtual bool	optimizeExtendOrTruncateConversion (Instruction *I, Loop *L, const TargetTransformInfo &TTI) const
	Try to optimize extending or truncating conversion instructions (like zext, trunc, fptoui, uitofp) for the target.
virtual bool	hasPairedLoad (EVT, Align &) const
	Return true if the target supplies and combines to a paired load two loaded values of type LoadedType next to each other in memory.
virtual bool	hasVectorBlend () const
	Return true if the target has a vector blend instruction.
virtual unsigned	getMaxSupportedInterleaveFactor () const
	Get the maximum supported factor for interleaved memory accesses.
virtual bool	lowerInterleavedLoad (LoadInst *LI, ArrayRef< ShuffleVectorInst * > Shuffles, ArrayRef< unsigned > Indices, unsigned Factor) const
	Lower an interleaved load to target specific intrinsics.
virtual bool	lowerInterleavedStore (StoreInst *SI, ShuffleVectorInst *SVI, unsigned Factor) const
	Lower an interleaved store to target specific intrinsics.
virtual bool	lowerDeinterleaveIntrinsicToLoad (IntrinsicInst *DI, LoadInst *LI, SmallVectorImpl< Instruction * > &DeadInsts) const
	Lower a deinterleave intrinsic to a target specific load intrinsic.
virtual bool	lowerInterleaveIntrinsicToStore (IntrinsicInst *II, StoreInst *SI, SmallVectorImpl< Instruction * > &DeadInsts) const
	Lower an interleave intrinsic to a target specific store intrinsic.
virtual bool	isFPExtFree (EVT DestVT, EVT SrcVT) const
	Return true if an fpext operation is free (for instance, because single-precision floating-point numbers are implicitly extended to double-precision).
virtual bool	isFPExtFoldable (const MachineInstr &MI, unsigned Opcode, LLT DestTy, LLT SrcTy) const
	Return true if an fpext operation input to an Opcode operation is free (for instance, because half-precision floating-point numbers are implicitly extended to float-precision) for an FMA instruction.
virtual bool	isFPExtFoldable (const SelectionDAG &DAG, unsigned Opcode, EVT DestVT, EVT SrcVT) const
	Return true if an fpext operation input to an Opcode operation is free (for instance, because half-precision floating-point numbers are implicitly extended to float-precision) for an FMA instruction.
virtual bool	isVectorLoadExtDesirable (SDValue ExtVal) const
	Return true if folding a vector load into ExtVal (a sign, zero, or any extend node) is profitable.
virtual bool	isFNegFree (EVT VT) const
	Return true if an fneg operation is free to the point where it is never worthwhile to replace it with a bitwise operation.
virtual bool	isFAbsFree (EVT VT) const
	Return true if an fabs operation is free to the point where it is never worthwhile to replace it with a bitwise operation.
virtual bool	isFMAFasterThanFMulAndFAdd (const MachineFunction &MF, EVT) const
	Return true if an FMA operation is faster than a pair of fmul and fadd instructions.
virtual bool	isFMAFasterThanFMulAndFAdd (const MachineFunction &MF, LLT) const
	Return true if an FMA operation is faster than a pair of fmul and fadd instructions.
virtual bool	isFMAFasterThanFMulAndFAdd (const Function &F, Type *) const
	IR version.
virtual bool	isFMADLegal (const MachineInstr &MI, LLT Ty) const
	Returns true if MI can be combined with another instruction to form TargetOpcode::G_FMAD.
virtual bool	isFMADLegal (const SelectionDAG &DAG, const SDNode *N) const
	Returns true if be combined with to form an ISD::FMAD.
virtual bool	generateFMAsInMachineCombiner (EVT VT, CodeGenOptLevel OptLevel) const
virtual bool	isNarrowingProfitable (EVT SrcVT, EVT DestVT) const
	Return true if it's profitable to narrow operations of type SrcVT to DestVT.
virtual bool	shouldFoldSelectWithIdentityConstant (unsigned BinOpcode, EVT VT) const
	Return true if pulling a binary operation into a select with an identity constant is profitable.
virtual bool	shouldConvertConstantLoadToIntImm (const APInt &Imm, Type *Ty) const
	Return true if it is beneficial to convert a load of a constant to just the constant itself.
virtual bool	isExtractSubvectorCheap (EVT ResVT, EVT SrcVT, unsigned Index) const
	Return true if EXTRACT_SUBVECTOR is cheap for extracting this result type from this source type with this index.
virtual bool	shouldScalarizeBinop (SDValue VecOp) const
	Try to convert an extract element of a vector binary operation into an extract element followed by a scalar operation.
virtual bool	isExtractVecEltCheap (EVT VT, unsigned Index) const
	Return true if extraction of a scalar element from the given vector type at the given index is cheap.
virtual bool	shouldFormOverflowOp (unsigned Opcode, EVT VT, bool MathUsed) const
	Try to convert math with an overflow comparison into the corresponding DAG node operation.
virtual bool	aggressivelyPreferBuildVectorSources (EVT VecVT) const
virtual bool	shouldConsiderGEPOffsetSplit () const
virtual bool	shouldAvoidTransformToShift (EVT VT, unsigned Amount) const
	Return true if creating a shift of the type by the given amount is not profitable.
virtual bool	shouldFoldSelectWithSingleBitTest (EVT VT, const APInt &AndMask) const
virtual bool	shouldKeepZExtForFP16Conv () const
	Does this target require the clearing of high-order bits in a register passed to the fp16 to fp conversion library function.
virtual bool	shouldConvertFpToSat (unsigned Op, EVT FPVT, EVT VT) const
	Should we generate fp_to_si_sat and fp_to_ui_sat from type FPVT to type VT from min(max(fptoi)) saturation patterns.
virtual bool	shouldExpandCmpUsingSelects () const
	Should we expand [US]CMP nodes using two selects and two compares, or by doing arithmetic on boolean types.
virtual bool	isComplexDeinterleavingSupported () const
	Does this target support complex deinterleaving.
virtual bool	isComplexDeinterleavingOperationSupported (ComplexDeinterleavingOperation Operation, Type *Ty) const
	Does this target support complex deinterleaving with the given operation and type.
virtual Value *	createComplexDeinterleavingIR (IRBuilderBase &B, ComplexDeinterleavingOperation OperationType, ComplexDeinterleavingRotation Rotation, Value *InputA, Value *InputB, Value *Accumulator=nullptr) const
	Create the IR node for the given complex deinterleaving operation.
void	setLibcallName (RTLIB::Libcall Call, const char *Name)
	Rename the default libcall routine name for the specified libcall.
void	setLibcallName (ArrayRef< RTLIB::Libcall > Calls, const char *Name)
const char *	getLibcallName (RTLIB::Libcall Call) const
	Get the libcall routine name for the specified libcall.
void	setCmpLibcallCC (RTLIB::Libcall Call, ISD::CondCode CC)
	Override the default CondCode to be used to test the result of the comparison libcall against zero.
ISD::CondCode	getCmpLibcallCC (RTLIB::Libcall Call) const
	Get the CondCode that's to be used to test the result of the comparison libcall against zero.
void	setLibcallCallingConv (RTLIB::Libcall Call, CallingConv::ID CC)
	Set the CallingConv that should be used for the specified libcall.
CallingConv::ID	getLibcallCallingConv (RTLIB::Libcall Call) const
	Get the CallingConv that should be used for the specified libcall.
virtual void	finalizeLowering (MachineFunction &MF) const
	Execute target specific actions to finalize target lowering.
virtual bool	shouldLocalize (const MachineInstr &MI, const TargetTransformInfo *TTI) const
	Check whether or not MI needs to be moved close to its uses.
int	InstructionOpcodeToISD (unsigned Opcode) const
	Get the ISD node that corresponds to the Instruction class opcode.
unsigned	getMaxAtomicSizeInBitsSupported () const
	Returns the maximum atomic operation size (in bits) supported by the backend.
unsigned	getMaxDivRemBitWidthSupported () const
	Returns the size in bits of the maximum div/rem the backend supports.
unsigned	getMaxLargeFPConvertBitWidthSupported () const
	Returns the size in bits of the maximum larget fp convert the backend supports.
unsigned	getMinCmpXchgSizeInBits () const
	Returns the size of the smallest cmpxchg or ll/sc instruction the backend supports.
bool	supportsUnalignedAtomics () const
	Whether the target supports unaligned atomic operations.
virtual bool	shouldInsertFencesForAtomic (const Instruction *I) const
	Whether AtomicExpandPass should automatically insert fences and reduce ordering for this atomic.
virtual bool	shouldInsertTrailingFenceForAtomicStore (const Instruction *I) const
	Whether AtomicExpandPass should automatically insert a trailing fence without reducing the ordering for this atomic.
virtual Value *	emitLoadLinked (IRBuilderBase &Builder, Type *ValueTy, Value *Addr, AtomicOrdering Ord) const
	Perform a load-linked operation on Addr, returning a "Value *" with the corresponding pointee type.
virtual Value *	emitStoreConditional (IRBuilderBase &Builder, Value *Val, Value *Addr, AtomicOrdering Ord) const
	Perform a store-conditional operation to Addr.
virtual Value *	emitMaskedAtomicRMWIntrinsic (IRBuilderBase &Builder, AtomicRMWInst *AI, Value *AlignedAddr, Value *Incr, Value *Mask, Value *ShiftAmt, AtomicOrdering Ord) const
	Perform a masked atomicrmw using a target-specific intrinsic.
virtual void	emitExpandAtomicRMW (AtomicRMWInst *AI) const
	Perform a atomicrmw expansion using a target-specific way.
virtual void	emitBitTestAtomicRMWIntrinsic (AtomicRMWInst *AI) const
	Perform a bit test atomicrmw using a target-specific intrinsic.
virtual void	emitCmpArithAtomicRMWIntrinsic (AtomicRMWInst *AI) const
	Perform a atomicrmw which the result is only used by comparison, using a target-specific intrinsic.
virtual Value *	emitMaskedAtomicCmpXchgIntrinsic (IRBuilderBase &Builder, AtomicCmpXchgInst *CI, Value *AlignedAddr, Value *CmpVal, Value *NewVal, Value *Mask, AtomicOrdering Ord) const
	Perform a masked cmpxchg using a target-specific intrinsic.
virtual MachineInstr *	EmitKCFICheck (MachineBasicBlock &MBB, MachineBasicBlock::instr_iterator &MBBI, const TargetInstrInfo *TII) const
virtual Instruction *	emitLeadingFence (IRBuilderBase &Builder, Instruction *Inst, AtomicOrdering Ord) const
	Inserts in the IR a target-specific intrinsic specifying a fence.
virtual Instruction *	emitTrailingFence (IRBuilderBase &Builder, Instruction *Inst, AtomicOrdering Ord) const

Additional Inherited Members
Public Types inherited from llvm::TargetLowering
enum	ConstraintType {   C_Register , C_RegisterClass , C_Memory , C_Address ,   C_Immediate , C_Other , C_Unknown }
enum	ConstraintWeight {   CW_Invalid = -1 , CW_Okay = 0 , CW_Good = 1 , CW_Better = 2 ,   CW_Best = 3 , CW_SpecificReg = CW_Okay , CW_Register = CW_Good , CW_Memory = CW_Better ,   CW_Constant = CW_Best , CW_Default = CW_Okay }
using	AsmOperandInfoVector = std::vector< AsmOperandInfo >
using	ConstraintPair = std::pair< StringRef, TargetLowering::ConstraintType >
using	ConstraintGroup = SmallVector< ConstraintPair >
Public Types inherited from llvm::TargetLoweringBase
enum	LegalizeAction : uint8_t {   Legal , Promote , Expand , LibCall ,   Custom }
	This enum indicates whether operations are valid for a target, and if not, what action should be used to make them valid. More...
enum	LegalizeTypeAction : uint8_t {   TypeLegal , TypePromoteInteger , TypeExpandInteger , TypeSoftenFloat ,   TypeExpandFloat , TypeScalarizeVector , TypeSplitVector , TypeWidenVector ,   TypePromoteFloat , TypeSoftPromoteHalf , TypeScalarizeScalableVector }
	This enum indicates whether a types are legal for a target, and if not, what action should be used to make them valid. More...
enum	BooleanContent { UndefinedBooleanContent , ZeroOrOneBooleanContent , ZeroOrNegativeOneBooleanContent }
	Enum that describes how the target represents true/false values. More...
enum	SelectSupportKind { ScalarValSelect , ScalarCondVectorVal , VectorMaskSelect }
	Enum that describes what type of support for selects the target has. More...
enum class	AtomicExpansionKind {   None , CastToInteger , LLSC , LLOnly ,   CmpXChg , MaskedIntrinsic , BitTestIntrinsic , CmpArithIntrinsic ,   Expand , NotAtomic }
	Enum that specifies what an atomic load/AtomicRMWInst is expanded to, if at all. More...
enum class	MulExpansionKind { Always , OnlyLegalOrCustom }
	Enum that specifies when a multiplication should be expanded. More...
enum class	NegatibleCost { Cheaper = 0 , Neutral = 1 , Expensive = 2 }
	Enum that specifies when a float negation is beneficial. More...
enum	AndOrSETCCFoldKind : uint8_t { None = 0 , AddAnd = 1 , NotAnd = 2 , ABS = 4 }
	Enum of different potentially desirable ways to fold (and/or (setcc ...), (setcc ...)). More...
enum	ReciprocalEstimate : int { Unspecified = -1 , Disabled = 0 , Enabled = 1 }
	Reciprocal estimate status values used by the functions below. More...
enum class	ShiftLegalizationStrategy { ExpandToParts , ExpandThroughStack , LowerToLibcall }
	Return the preferred strategy to legalize tihs SHIFT instruction, with ExpansionFactor being the recursion depth - how many expansion needed. More...
using	LegalizeKind = std::pair< LegalizeTypeAction, EVT >
	LegalizeKind holds the legalization kind that needs to happen to EVT in order to type-legalize it.
using	ArgListTy = std::vector< ArgListEntry >
Static Public Member Functions inherited from llvm::TargetLoweringBase
static ISD::NodeType	getExtendForContent (BooleanContent Content)
Protected Member Functions inherited from llvm::TargetLoweringBase
void	initActions ()
	Initialize all of the actions to default values.
Value *	getDefaultSafeStackPointerLocation (IRBuilderBase &IRB, bool UseTLS) const
void	setBooleanContents (BooleanContent Ty)
	Specify how the target extends the result of integer and floating point boolean values from i1 to a wider type.
void	setBooleanContents (BooleanContent IntTy, BooleanContent FloatTy)
	Specify how the target extends the result of integer and floating point boolean values from i1 to a wider type.
void	setBooleanVectorContents (BooleanContent Ty)
	Specify how the target extends the result of a vector boolean value from a vector of i1 to a wider type.
void	setSchedulingPreference (Sched::Preference Pref)
	Specify the target scheduling preference.
void	setMinimumJumpTableEntries (unsigned Val)
	Indicate the minimum number of blocks to generate jump tables.
void	setMaximumJumpTableSize (unsigned)
	Indicate the maximum number of entries in jump tables.
void	setStackPointerRegisterToSaveRestore (Register R)
	If set to a physical register, this specifies the register that llvm.savestack/llvm.restorestack should save and restore.
void	setHasMultipleConditionRegisters (bool hasManyRegs=true)
	Tells the code generator that the target has multiple (allocatable) condition registers that can be used to store the results of comparisons for use by selects and conditional branches.
void	setHasExtractBitsInsn (bool hasExtractInsn=true)
	Tells the code generator that the target has BitExtract instructions.
void	setJumpIsExpensive (bool isExpensive=true)
	Tells the code generator not to expand logic operations on comparison predicates into separate sequences that increase the amount of flow control.
void	addBypassSlowDiv (unsigned int SlowBitWidth, unsigned int FastBitWidth)
	Tells the code generator which bitwidths to bypass.
void	addRegisterClass (MVT VT, const TargetRegisterClass *RC)
	Add the specified register class as an available regclass for the specified value type.
virtual std::pair< const TargetRegisterClass *, uint8_t >	findRepresentativeClass (const TargetRegisterInfo *TRI, MVT VT) const
	Return the largest legal super-reg register class of the register class for the specified type and its associated "cost".
void	computeRegisterProperties (const TargetRegisterInfo *TRI)
	Once all of the register classes are added, this allows us to compute derived properties we expose.
void	setOperationAction (unsigned Op, MVT VT, LegalizeAction Action)
	Indicate that the specified operation does not work with the specified type and indicate what to do about it.
void	setOperationAction (ArrayRef< unsigned > Ops, MVT VT, LegalizeAction Action)
void	setOperationAction (ArrayRef< unsigned > Ops, ArrayRef< MVT > VTs, LegalizeAction Action)
void	setLoadExtAction (unsigned ExtType, MVT ValVT, MVT MemVT, LegalizeAction Action)
	Indicate that the specified load with extension does not work with the specified type and indicate what to do about it.
void	setLoadExtAction (ArrayRef< unsigned > ExtTypes, MVT ValVT, MVT MemVT, LegalizeAction Action)
void	setLoadExtAction (ArrayRef< unsigned > ExtTypes, MVT ValVT, ArrayRef< MVT > MemVTs, LegalizeAction Action)
void	setAtomicLoadExtAction (unsigned ExtType, MVT ValVT, MVT MemVT, LegalizeAction Action)
	Let target indicate that an extending atomic load of the specified type is legal.
void	setAtomicLoadExtAction (ArrayRef< unsigned > ExtTypes, MVT ValVT, MVT MemVT, LegalizeAction Action)
void	setAtomicLoadExtAction (ArrayRef< unsigned > ExtTypes, MVT ValVT, ArrayRef< MVT > MemVTs, LegalizeAction Action)
void	setTruncStoreAction (MVT ValVT, MVT MemVT, LegalizeAction Action)
	Indicate that the specified truncating store does not work with the specified type and indicate what to do about it.
void	setIndexedLoadAction (ArrayRef< unsigned > IdxModes, MVT VT, LegalizeAction Action)
	Indicate that the specified indexed load does or does not work with the specified type and indicate what to do abort it.
void	setIndexedLoadAction (ArrayRef< unsigned > IdxModes, ArrayRef< MVT > VTs, LegalizeAction Action)
void	setIndexedStoreAction (ArrayRef< unsigned > IdxModes, MVT VT, LegalizeAction Action)
	Indicate that the specified indexed store does or does not work with the specified type and indicate what to do about it.
void	setIndexedStoreAction (ArrayRef< unsigned > IdxModes, ArrayRef< MVT > VTs, LegalizeAction Action)
void	setIndexedMaskedLoadAction (unsigned IdxMode, MVT VT, LegalizeAction Action)
	Indicate that the specified indexed masked load does or does not work with the specified type and indicate what to do about it.
void	setIndexedMaskedStoreAction (unsigned IdxMode, MVT VT, LegalizeAction Action)
	Indicate that the specified indexed masked store does or does not work with the specified type and indicate what to do about it.
void	setCondCodeAction (ArrayRef< ISD::CondCode > CCs, MVT VT, LegalizeAction Action)
	Indicate that the specified condition code is or isn't supported on the target and indicate what to do about it.
void	setCondCodeAction (ArrayRef< ISD::CondCode > CCs, ArrayRef< MVT > VTs, LegalizeAction Action)
void	AddPromotedToType (unsigned Opc, MVT OrigVT, MVT DestVT)
	If Opc/OrigVT is specified as being promoted, the promotion code defaults to trying a larger integer/fp until it can find one that works.
void	setOperationPromotedToType (unsigned Opc, MVT OrigVT, MVT DestVT)
	Convenience method to set an operation to Promote and specify the type in a single call.
void	setOperationPromotedToType (ArrayRef< unsigned > Ops, MVT OrigVT, MVT DestVT)
void	setTargetDAGCombine (ArrayRef< ISD::NodeType > NTs)
	Targets should invoke this method for each target independent node that they want to provide a custom DAG combiner for by implementing the PerformDAGCombine virtual method.
void	setMinFunctionAlignment (Align Alignment)
	Set the target's minimum function alignment.
void	setPrefFunctionAlignment (Align Alignment)
	Set the target's preferred function alignment.
void	setPrefLoopAlignment (Align Alignment)
	Set the target's preferred loop alignment.
void	setMaxBytesForAlignment (unsigned MaxBytes)
void	setMinStackArgumentAlignment (Align Alignment)
	Set the minimum stack alignment of an argument.
void	setMaxAtomicSizeInBitsSupported (unsigned SizeInBits)
	Set the maximum atomic operation size supported by the backend.
void	setMaxDivRemBitWidthSupported (unsigned SizeInBits)
	Set the size in bits of the maximum div/rem the backend supports.
void	setMaxLargeFPConvertBitWidthSupported (unsigned SizeInBits)
	Set the size in bits of the maximum fp convert the backend supports.
void	setMinCmpXchgSizeInBits (unsigned SizeInBits)
	Sets the minimum cmpxchg or ll/sc size supported by the backend.
void	setSupportsUnalignedAtomics (bool UnalignedSupported)
	Sets whether unaligned atomic operations are supported.
virtual bool	isExtFreeImpl (const Instruction *I) const
	Return true if the extension represented by I is free.
bool	isLegalRC (const TargetRegisterInfo &TRI, const TargetRegisterClass &RC) const
	Return true if the value types that can be represented by the specified register class are all legal.
MachineBasicBlock *	emitPatchPoint (MachineInstr &MI, MachineBasicBlock *MBB) const
	Replace/modify any TargetFrameIndex operands with a targte-dependent sequence of memory operands that is recognized by PrologEpilogInserter.
Protected Attributes inherited from llvm::TargetLoweringBase
unsigned	GatherAllAliasesMaxDepth
	Depth that GatherAllAliases should continue looking for chain dependencies when trying to find a more preferable chain.
unsigned	MaxStoresPerMemset
	Specify maximum number of store instructions per memset call.
unsigned	MaxStoresPerMemsetOptSize
	Likewise for functions with the OptSize attribute.
unsigned	MaxStoresPerMemcpy
	Specify maximum number of store instructions per memcpy call.
unsigned	MaxStoresPerMemcpyOptSize
	Likewise for functions with the OptSize attribute.
unsigned	MaxGluedStoresPerMemcpy = 0
	Specify max number of store instructions to glue in inlined memcpy.
unsigned	MaxLoadsPerMemcmp
	Specify maximum number of load instructions per memcmp call.
unsigned	MaxLoadsPerMemcmpOptSize
	Likewise for functions with the OptSize attribute.
unsigned	MaxStoresPerMemmove
	Specify maximum number of store instructions per memmove call.
unsigned	MaxStoresPerMemmoveOptSize
	Likewise for functions with the OptSize attribute.
bool	PredictableSelectIsExpensive
	Tells the code generator that select is more expensive than a branch if the branch is usually predicted right.
bool	EnableExtLdPromotion
bool	IsStrictFPEnabled

Detailed Description

Definition at line 35 of file BPFISelLowering.h.

Constructor & Destructor Documentation

BPFTargetLowering()

BPFTargetLowering::BPFTargetLowering ( const TargetMachine &  TM, const BPFSubtarget &  STI  )

explicit

Definition at line 53 of file BPFISelLowering.cpp.

References llvm::TargetLoweringBase::addRegisterClass(), llvm::ISD::ATOMIC_CMP_SWAP_WITH_SUCCESS, llvm::ISD::ATOMIC_LOAD_ADD, llvm::ISD::ATOMIC_LOAD_AND, llvm::ISD::ATOMIC_LOAD_OR, llvm::ISD::ATOMIC_LOAD_XOR, llvm::ISD::ATOMIC_SWAP, BPFExpandMemcpyInOrder, llvm::ISD::BR_CC, llvm::ISD::BR_JT, llvm::ISD::BRCOND, llvm::ISD::BRIND, llvm::ISD::BSWAP, llvm::TargetLoweringBase::computeRegisterProperties(), llvm::ISD::ConstantPool, llvm::ISD::CTLZ, llvm::ISD::CTLZ_ZERO_UNDEF, llvm::ISD::CTPOP, llvm::ISD::CTTZ, llvm::ISD::CTTZ_ZERO_UNDEF, llvm::TargetLoweringBase::Custom, llvm::ISD::DYNAMIC_STACKALLOC, llvm::TargetLoweringBase::Expand, llvm::ISD::EXTLOAD, llvm::BPFSelectionDAGInfo::getCommonMaxStoresPerMemFunc(), llvm::BPFSubtarget::getHasAlu32(), llvm::BPFSubtarget::getHasJmp32(), llvm::BPFSubtarget::getHasJmpExt(), llvm::BPFSubtarget::getRegisterInfo(), llvm::BPFSubtarget::getSelectionDAGInfo(), llvm::ISD::GlobalAddress, llvm::BPFSubtarget::hasLdsx(), llvm::BPFSubtarget::hasMovsx(), llvm::BPFSubtarget::hasSdivSmod(), llvm::MVT::integer_valuetypes(), llvm::TargetLoweringBase::MaxLoadsPerMemcmp, llvm::TargetLoweringBase::MaxLoadsPerMemcmpOptSize, llvm::TargetLoweringBase::MaxStoresPerMemcpy, llvm::TargetLoweringBase::MaxStoresPerMemcpyOptSize, llvm::TargetLoweringBase::MaxStoresPerMemmove, llvm::TargetLoweringBase::MaxStoresPerMemmoveOptSize, llvm::TargetLoweringBase::MaxStoresPerMemset, llvm::TargetLoweringBase::MaxStoresPerMemsetOptSize, llvm::ISD::MULHS, llvm::ISD::MULHU, llvm::TargetLoweringBase::Promote, llvm::ISD::ROTL, llvm::ISD::ROTR, llvm::ISD::SDIV, llvm::ISD::SDIVREM, llvm::ISD::SELECT, llvm::ISD::SELECT_CC, llvm::TargetLoweringBase::setBooleanContents(), llvm::ISD::SETCC, llvm::TargetLoweringBase::setLoadExtAction(), llvm::TargetLoweringBase::setMaxAtomicSizeInBitsSupported(), llvm::TargetLoweringBase::setMinFunctionAlignment(), llvm::TargetLoweringBase::setOperationAction(), llvm::TargetLoweringBase::setPrefFunctionAlignment(), llvm::TargetLoweringBase::setStackPointerRegisterToSaveRestore(), llvm::ISD::SEXTLOAD, llvm::ISD::SHL_PARTS, llvm::ISD::SIGN_EXTEND_INREG, llvm::ISD::SMUL_LOHI, llvm::ISD::SRA_PARTS, llvm::ISD::SREM, llvm::ISD::SRL_PARTS, llvm::ISD::STACKRESTORE, llvm::ISD::STACKSAVE, llvm::ISD::UDIVREM, llvm::ISD::UMUL_LOHI, llvm::TargetLoweringBase::ZeroOrOneBooleanContent, and llvm::ISD::ZEXTLOAD.

Member Function Documentation

EmitInstrWithCustomInserter()

MachineBasicBlock * BPFTargetLowering::EmitInstrWithCustomInserter ( MachineInstr &  MI, MachineBasicBlock *  MBB  ) const

overridevirtual

This method should be implemented by targets that mark instructions with the 'usesCustomInserter' flag.

These instructions are special in various ways, which require special support to insert. The specified MachineInstr is created but not inserted into any basic blocks, and this method is called to expand it into a sequence of instructions, potentially also creating new basic blocks and control flow. As long as the returned basic block is different (i.e., we created a new one), the custom inserter is free to modify the rest of MBB.

Reimplemented from llvm::TargetLowering.

Definition at line 796 of file BPFISelLowering.cpp.

References llvm::MachineInstrBuilder::addImm(), llvm::MachineInstrBuilder::addMBB(), llvm::MachineInstrBuilder::addReg(), llvm::MachineBasicBlock::addSuccessor(), llvm::MachineBasicBlock::begin(), llvm::BuildMI(), CC, DL, llvm::MachineBasicBlock::end(), F, llvm::MachineBasicBlock::getBasicBlock(), llvm::TargetSubtargetInfo::getInstrInfo(), llvm::ilist_node_impl< OptionsT >::getIterator(), llvm::MachineBasicBlock::getParent(), llvm::MachineFunction::getSubtarget(), I, LHS, MI, llvm::report_fatal_error(), RHS, SET_NEWCC, llvm::ISD::SETGE, llvm::ISD::SETGT, llvm::ISD::SETLE, llvm::ISD::SETLT, llvm::MachineBasicBlock::splice(), TII, and llvm::MachineBasicBlock::transferSuccessorsAndUpdatePHIs().

getConstraintType()

BPFTargetLowering::ConstraintType BPFTargetLowering::getConstraintType ( StringRef  Constraint ) const

overridevirtual

Given a constraint, return the type of constraint it is for this target.

Reimplemented from llvm::TargetLowering.

Definition at line 242 of file BPFISelLowering.cpp.

References llvm::TargetLowering::C_RegisterClass, llvm::TargetLowering::getConstraintType(), and llvm::StringRef::size().

getHasAlu32()

bool llvm::BPFTargetLowering::getHasAlu32 ( ) const

inline

Definition at line 60 of file BPFISelLowering.h.

Referenced by getScalarShiftAmountTy(), and getSetCCResultType().

getHasJmp32()

bool llvm::BPFTargetLowering::getHasJmp32 ( ) const

inline

Definition at line 61 of file BPFISelLowering.h.

getHasJmpExt()

bool llvm::BPFTargetLowering::getHasJmpExt ( ) const

inline

Definition at line 62 of file BPFISelLowering.h.

getRegForInlineAsmConstraint()

std::pair< unsigned, const TargetRegisterClass * > BPFTargetLowering::getRegForInlineAsmConstraint ( const TargetRegisterInfo *  TRI, StringRef  Constraint, MVT  VT  ) const

overridevirtual

Given a physical register constraint (e.g.

{edx}), return the register number and the register class for the register.

Given a register class constraint, like 'r', if this corresponds directly to an LLVM register class, return a register of 0 and the register class pointer.

This should only be used for C_Register constraints. On error, this returns a register number of 0 and a null register class pointer.

Reimplemented from llvm::TargetLowering.

Definition at line 256 of file BPFISelLowering.cpp.

References llvm::TargetLowering::getRegForInlineAsmConstraint(), llvm::StringRef::size(), and TRI.

getScalarShiftAmountTy()

MVT BPFTargetLowering::getScalarShiftAmountTy ( const DataLayout &  DL, EVT    ) const

overridevirtual

Return the type to use for a scalar shift opcode, given the shifted amount type.

Targets should return a legal type if the input type is legal. Targets can return a type that is too small if the input type is illegal.

Reimplemented from llvm::TargetLoweringBase.

Definition at line 938 of file BPFISelLowering.cpp.

References getHasAlu32().

getSetCCResultType()

EVT BPFTargetLowering::getSetCCResultType ( const DataLayout &  DL, LLVMContext &  Context, EVT  VT  ) const

overridevirtual

Return the ValueType of the result of SETCC operations.

Reimplemented from llvm::TargetLoweringBase.

Definition at line 933 of file BPFISelLowering.cpp.

References getHasAlu32().

getTargetNodeName()

const char * BPFTargetLowering::getTargetNodeName ( unsigned  Opcode ) const

overridevirtual

This method returns the name of a target specific DAG node.

Reimplemented from llvm::TargetLowering.

Definition at line 675 of file BPFISelLowering.cpp.

References llvm::BPFISD::BR_CC, llvm::BPFISD::CALL, llvm::BPFISD::FIRST_NUMBER, llvm::BPFISD::MEMCPY, llvm::BPFISD::RET_GLUE, llvm::BPFISD::SELECT_CC, and llvm::BPFISD::Wrapper.

isOffsetFoldingLegal()

bool BPFTargetLowering::isOffsetFoldingLegal ( const GlobalAddressSDNode *  GA ) const

overridevirtual

Return true if folding a constant offset with the given GlobalAddress is legal.

It is frequently not legal in PIC relocation models.

Reimplemented from llvm::TargetLowering.

Definition at line 193 of file BPFISelLowering.cpp.

LowerOperation()

SDValue BPFTargetLowering::LowerOperation ( SDValue  Op, SelectionDAG &  DAG  ) const

overridevirtual

This callback is invoked for operations that are unsupported by the target, which are registered to use 'custom' lowering, and whose defined values are all legal.

If the target has no operations that require custom lowering, it need not implement this. The default implementation of this aborts.

Reimplemented from llvm::TargetLowering.

Definition at line 302 of file BPFISelLowering.cpp.

References llvm::ISD::BR_CC, llvm::ISD::ConstantPool, llvm::ISD::DYNAMIC_STACKALLOC, llvm::ISD::GlobalAddress, llvm::report_fatal_error(), llvm::ISD::SDIV, llvm::ISD::SELECT_CC, and llvm::ISD::SREM.

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

• lib/Target/BPF/BPFISelLowering.h
• lib/Target/BPF/BPFISelLowering.cpp