#include <FastISel.h>

Collaboration diagram for llvm::FastISel:

Classes
struct	SavePoint

Public Member Functions
MachineInstr *	getLastLocalValue ()

void	setLastLocalValue (MachineInstr *I)

void	startNewBlock ()

DebugLoc	getCurDebugLoc () const
	Return current debug location information. More...

bool	LowerArguments ()

bool	SelectInstruction (const Instruction *I)

bool	SelectOperator (const User *I, unsigned Opcode)

unsigned	getRegForValue (const Value *V)

unsigned	lookUpRegForValue (const Value *V)

std::pair< unsigned, bool >	getRegForGEPIndex (const Value *V)

bool	tryToFoldLoad (const LoadInst LI, const Instruction FoldInst)
	We're checking to see if we can fold `LI` into `FoldInst`. Note that we could have a sequence where multiple LLVM IR instructions are folded into the same machineinstr. For example we could have: More...

virtual bool	tryToFoldLoadIntoMI (MachineInstr , unsigned, const LoadInst )
	The specified machine instr operand is a vreg, and that vreg is being provided by the specified load instruction. If possible, try to fold the load as an operand to the instruction, returning true if possible. More...

void	recomputeInsertPt ()

void	removeDeadCode (MachineBasicBlock::iterator I, MachineBasicBlock::iterator E)
	Remove all dead instructions between the I and E. More...

SavePoint	enterLocalValueArea ()

void	leaveLocalValueArea (SavePoint Old)
	Reset InsertPt to the given old insert position. More...

virtual	~FastISel ()

Protected Member Functions
	FastISel (FunctionLoweringInfo &funcInfo, const TargetLibraryInfo *libInfo)

virtual bool	TargetSelectInstruction (const Instruction *I)=0

virtual bool	FastLowerArguments ()

virtual unsigned	FastEmit_ (MVT VT, MVT RetVT, unsigned Opcode)

virtual unsigned	FastEmit_r (MVT VT, MVT RetVT, unsigned Opcode, unsigned Op0, bool Op0IsKill)

virtual unsigned	FastEmit_rr (MVT VT, MVT RetVT, unsigned Opcode, unsigned Op0, bool Op0IsKill, unsigned Op1, bool Op1IsKill)

virtual unsigned	FastEmit_ri (MVT VT, MVT RetVT, unsigned Opcode, unsigned Op0, bool Op0IsKill, uint64_t Imm)

virtual unsigned	FastEmit_rf (MVT VT, MVT RetVT, unsigned Opcode, unsigned Op0, bool Op0IsKill, const ConstantFP *FPImm)

virtual unsigned	FastEmit_rri (MVT VT, MVT RetVT, unsigned Opcode, unsigned Op0, bool Op0IsKill, unsigned Op1, bool Op1IsKill, uint64_t Imm)

unsigned	FastEmit_ri_ (MVT VT, unsigned Opcode, unsigned Op0, bool Op0IsKill, uint64_t Imm, MVT ImmType)
	This method is a wrapper of FastEmit_ri. More...

virtual unsigned	FastEmit_i (MVT VT, MVT RetVT, unsigned Opcode, uint64_t Imm)

virtual unsigned	FastEmit_f (MVT VT, MVT RetVT, unsigned Opcode, const ConstantFP *FPImm)

unsigned	FastEmitInst_ (unsigned MachineInstOpcode, const TargetRegisterClass *RC)

unsigned	FastEmitInst_r (unsigned MachineInstOpcode, const TargetRegisterClass *RC, unsigned Op0, bool Op0IsKill)

unsigned	FastEmitInst_rr (unsigned MachineInstOpcode, const TargetRegisterClass *RC, unsigned Op0, bool Op0IsKill, unsigned Op1, bool Op1IsKill)

unsigned	FastEmitInst_rrr (unsigned MachineInstOpcode, const TargetRegisterClass *RC, unsigned Op0, bool Op0IsKill, unsigned Op1, bool Op1IsKill, unsigned Op2, bool Op2IsKill)

unsigned	FastEmitInst_ri (unsigned MachineInstOpcode, const TargetRegisterClass *RC, unsigned Op0, bool Op0IsKill, uint64_t Imm)

unsigned	FastEmitInst_rii (unsigned MachineInstOpcode, const TargetRegisterClass *RC, unsigned Op0, bool Op0IsKill, uint64_t Imm1, uint64_t Imm2)
	Emit a MachineInstr with one register operand and two immediate operands. More...

unsigned	FastEmitInst_rf (unsigned MachineInstOpcode, const TargetRegisterClass RC, unsigned Op0, bool Op0IsKill, const ConstantFP FPImm)

unsigned	FastEmitInst_rri (unsigned MachineInstOpcode, const TargetRegisterClass *RC, unsigned Op0, bool Op0IsKill, unsigned Op1, bool Op1IsKill, uint64_t Imm)

unsigned	FastEmitInst_rrii (unsigned MachineInstOpcode, const TargetRegisterClass *RC, unsigned Op0, bool Op0IsKill, unsigned Op1, bool Op1IsKill, uint64_t Imm1, uint64_t Imm2)

unsigned	FastEmitInst_i (unsigned MachineInstrOpcode, const TargetRegisterClass *RC, uint64_t Imm)

unsigned	FastEmitInst_ii (unsigned MachineInstrOpcode, const TargetRegisterClass *RC, uint64_t Imm1, uint64_t Imm2)
	Emit a MachineInstr with a two immediate operands. More...

unsigned	FastEmitInst_extractsubreg (MVT RetVT, unsigned Op0, bool Op0IsKill, uint32_t Idx)

unsigned	FastEmitZExtFromI1 (MVT VT, unsigned Op0, bool Op0IsKill)

void	FastEmitBranch (MachineBasicBlock *MBB, DebugLoc DL)

void	UpdateValueMap (const Value *I, unsigned Reg, unsigned NumRegs=1)

unsigned	createResultReg (const TargetRegisterClass *RC)

virtual unsigned	TargetMaterializeConstant (const Constant *C)

virtual unsigned	TargetMaterializeAlloca (const AllocaInst *C)
	Emit an alloca address in a register using target-specific logic. More...

virtual unsigned	TargetMaterializeFloatZero (const ConstantFP *CF)

bool	canFoldAddIntoGEP (const User GEP, const Value Add)
	Check if `Add` is an add that can be safely folded into `GEP`. More...

Protected Attributes
DenseMap< const Value *, unsigned >	LocalValueMap

FunctionLoweringInfo &	FuncInfo

MachineRegisterInfo &	MRI

MachineFrameInfo &	MFI

MachineConstantPool &	MCP

DebugLoc	DL

const TargetMachine &	TM

const DataLayout &	TD

const TargetInstrInfo &	TII

const TargetLowering &	TLI

const TargetRegisterInfo &	TRI

const TargetLibraryInfo *	LibInfo

MachineInstr *	LastLocalValue

MachineInstr *	EmitStartPt

Detailed Description

This is a fast-path instruction selection class that generates poor code and doesn't support illegal types or non-trivial lowering, but runs quickly.

Definition at line 47 of file FastISel.h.

Constructor & Destructor Documentation

FastISel::~FastISel ( )

virtual

Definition at line 1106 of file FastISel.cpp.

FastISel::FastISel	(	FunctionLoweringInfo &	funcInfo,
		const TargetLibraryInfo *	libInfo
	)

explicitprotected

Definition at line 1092 of file FastISel.cpp.

Member Function Documentation

bool FastISel::canFoldAddIntoGEP	(	const User *	GEP,
		const Value *	Add
	)

protected

Check if Add is an add that can be safely folded into GEP.

Add can be folded into GEP if:

Add is an add,
Add's size matches GEP's,
Add is in the same basic block as GEP, and
Add has a constant operand.

Definition at line 1574 of file FastISel.cpp.

References FuncInfo, getParent(), llvm::Value::getType(), llvm::DataLayout::getTypeSizeInBits(), llvm::FunctionLoweringInfo::MBB, llvm::FunctionLoweringInfo::MBBMap, and TD.

unsigned FastISel::createResultReg ( const TargetRegisterClass * RC )

protected

Definition at line 1203 of file FastISel.cpp.

References llvm::MachineRegisterInfo::createVirtualRegister(), and MRI.

Referenced by FastEmitInst_(), FastEmitInst_extractsubreg(), FastEmitInst_i(), FastEmitInst_ii(), FastEmitInst_r(), FastEmitInst_rf(), FastEmitInst_ri(), FastEmitInst_rii(), FastEmitInst_rr(), FastEmitInst_rri(), FastEmitInst_rrii(), and FastEmitInst_rrr().

FastISel::SavePoint FastISel::enterLocalValueArea ( )

Prepare InsertPt to begin inserting instructions into the local value area and return the old insert position.

Definition at line 336 of file FastISel.cpp.

References DL, FuncInfo, llvm::FunctionLoweringInfo::InsertPt, and recomputeInsertPt().

Referenced by getRegForValue().

unsigned FastISel::FastEmit_	(	MVT	VT,
		MVT	RetVT,
		unsigned	Opcode
	)

protectedvirtual

This method is called by target-independent code to request that an instruction with the given type and opcode be emitted.

Definition at line 1112 of file FastISel.cpp.

unsigned FastISel::FastEmit_f	(	MVT	VT,
		MVT	RetVT,
		unsigned	Opcode,
		const ConstantFP *	FPImm
	)

protectedvirtual

This method is called by target-independent code to request that an instruction with the given type, opcode, and floating-point immediate operand be emitted.

Definition at line 1134 of file FastISel.cpp.

unsigned FastISel::FastEmit_i	(	MVT	VT,
		MVT	RetVT,
		unsigned	Opcode,
		uint64_t	Imm
	)

protectedvirtual

This method is called by target-independent code to request that an instruction with the given type, opcode, and immediate operand be emitted.

Definition at line 1130 of file FastISel.cpp.

Referenced by FastEmit_ri_().

unsigned FastISel::FastEmit_r	(	MVT	VT,
		MVT	RetVT,
		unsigned	Opcode,
		unsigned	Op0,
		bool	Op0IsKill
	)

protectedvirtual

This method is called by target-independent code to request that an instruction with the given type, opcode, and register operand be emitted.

Definition at line 1117 of file FastISel.cpp.

Referenced by getRegForGEPIndex().

unsigned FastISel::FastEmit_rf	(	MVT	VT,
		MVT	RetVT,
		unsigned	Opcode,
		unsigned	Op0,
		bool	Op0IsKill,
		const ConstantFP *	FPImm
	)

protectedvirtual

This method is called by target-independent code to request that an instruction with the given type, opcode, and register and floating-point immediate operands be emitted.

Definition at line 1146 of file FastISel.cpp.

unsigned FastISel::FastEmit_ri	(	MVT	VT,
		MVT	RetVT,
		unsigned	Opcode,
		unsigned	Op0,
		bool	Op0IsKill,
		uint64_t	Imm
	)

protectedvirtual

This method is called by target-independent code to request that an instruction with the given type, opcode, and register and immediate operands be emitted.

Definition at line 1139 of file FastISel.cpp.

Referenced by FastEmit_ri_(), and FastEmitZExtFromI1().

unsigned FastISel::FastEmit_ri_	(	MVT	VT,
		unsigned	Opcode,
		unsigned	Op0,
		bool	Op0IsKill,
		uint64_t	Imm,
		MVT	ImmType
	)

protected

This method is a wrapper of FastEmit_ri.

It first tries to emit an instruction with an immediate operand using FastEmit_ri. If that fails, it materializes the immediate into a register and try FastEmit_rr instead.

FastEmit_ri_ - This method is a wrapper of FastEmit_ri. It first tries to emit an instruction with an immediate operand using FastEmit_ri. If that fails, it materializes the immediate into a register and try FastEmit_rr instead.

Definition at line 1165 of file FastISel.cpp.

References llvm::ISD::Constant, FastEmit_i(), FastEmit_ri(), FastEmit_rr(), llvm::FunctionLoweringInfo::Fn, FuncInfo, llvm::IntegerType::get(), llvm::ConstantInt::get(), llvm::Function::getContext(), getRegForValue(), llvm::MVT::getSizeInBits(), llvm::isPowerOf2_64(), llvm::Log2_64(), llvm::ISD::MUL, llvm::ISD::SHL, llvm::ISD::SRA, llvm::ISD::SRL, and llvm::ISD::UDIV.

unsigned FastISel::FastEmit_rr	(	MVT	VT,
		MVT	RetVT,
		unsigned	Opcode,
		unsigned	Op0,
		bool	Op0IsKill,
		unsigned	Op1,
		bool	Op1IsKill
	)

protectedvirtual

This method is called by target-independent code to request that an instruction with the given type, opcode, and register operands be emitted.

Definition at line 1123 of file FastISel.cpp.

Referenced by FastEmit_ri_().

unsigned FastISel::FastEmit_rri	(	MVT	VT,
		MVT	RetVT,
		unsigned	Opcode,
		unsigned	Op0,
		bool	Op0IsKill,
		unsigned	Op1,
		bool	Op1IsKill,
		uint64_t	Imm
	)

protectedvirtual

This method is called by target-independent code to request that an instruction with the given type, opcode, and register and immediate operands be emitted.

Definition at line 1153 of file FastISel.cpp.

void FastISel::FastEmitBranch	(	MachineBasicBlock *	MSucc,
		DebugLoc	DL
	)

protected

Emit an unconditional branch to the given block, unless it is the immediate (fall-through) successor, and update the CFG.

FastEmitBranch - Emit an unconditional branch to the given block, unless it is the immediate (fall-through) successor, and update the CFG.

Definition at line 874 of file FastISel.cpp.

References llvm::MachineBasicBlock::addSuccessor(), FuncInfo, llvm::MachineBasicBlock::getBasicBlock(), llvm::TargetInstrInfo::InsertBranch(), llvm::MachineBasicBlock::isLayoutSuccessor(), llvm::FunctionLoweringInfo::MBB, llvm::BasicBlock::size(), and TII.

Referenced by SelectOperator().

unsigned FastISel::FastEmitInst_	(	unsigned	MachineInstOpcode,
		const TargetRegisterClass *	RC
	)

protected

Emit a MachineInstr with no operands and a result register in the given register class.

Definition at line 1207 of file FastISel.cpp.

References llvm::BuildMI(), createResultReg(), DL, FuncInfo, llvm::MCInstrInfo::get(), llvm::FunctionLoweringInfo::InsertPt, llvm::FunctionLoweringInfo::MBB, and TII.

unsigned FastISel::FastEmitInst_extractsubreg	(	MVT	RetVT,
		unsigned	Op0,
		bool	Op0IsKill,
		uint32_t	Idx
	)

protected

Emit a MachineInstr for an extract_subreg from a specified index of a superregister to a specified type.

Definition at line 1426 of file FastISel.cpp.

References llvm::BuildMI(), llvm::MachineRegisterInfo::constrainRegClass(), llvm::TargetOpcode::COPY, createResultReg(), DL, FuncInfo, llvm::MCInstrInfo::get(), llvm::getKillRegState(), llvm::MachineRegisterInfo::getRegClass(), llvm::TargetLoweringBase::getRegClassFor(), llvm::TargetRegisterInfo::getSubClassWithSubReg(), llvm::FunctionLoweringInfo::InsertPt, llvm::TargetRegisterInfo::isVirtualRegister(), llvm::FunctionLoweringInfo::MBB, MRI, TII, TLI, and TRI.

unsigned FastISel::FastEmitInst_i	(	unsigned	MachineInstrOpcode,
		const TargetRegisterClass *	RC,
		uint64_t	Imm
	)

protected

Emit a MachineInstr with a single immediate operand, and a result register in the given register class.

Definition at line 1393 of file FastISel.cpp.

References llvm::MachineInstrBuilder::addImm(), llvm::BuildMI(), llvm::TargetOpcode::COPY, createResultReg(), DL, FuncInfo, llvm::MCInstrInfo::get(), llvm::MCInstrDesc::getNumDefs(), llvm::MCInstrDesc::ImplicitDefs, llvm::FunctionLoweringInfo::InsertPt, llvm::FunctionLoweringInfo::MBB, and TII.

unsigned FastISel::FastEmitInst_ii	(	unsigned	MachineInstrOpcode,
		const TargetRegisterClass *	RC,
		uint64_t	Imm1,
		uint64_t	Imm2
	)

protected

Emit a MachineInstr with a two immediate operands.

Definition at line 1409 of file FastISel.cpp.

References llvm::MachineInstrBuilder::addImm(), llvm::BuildMI(), llvm::TargetOpcode::COPY, createResultReg(), DL, FuncInfo, llvm::MCInstrInfo::get(), llvm::MCInstrDesc::getNumDefs(), llvm::MCInstrDesc::ImplicitDefs, llvm::FunctionLoweringInfo::InsertPt, llvm::FunctionLoweringInfo::MBB, and TII.

unsigned FastISel::FastEmitInst_r	(	unsigned	MachineInstOpcode,
		const TargetRegisterClass *	RC,
		unsigned	Op0,
		bool	Op0IsKill
	)

protected

Emit a MachineInstr with one register operand and a result register in the given register class.

Definition at line 1216 of file FastISel.cpp.

References llvm::MachineInstrBuilder::addReg(), llvm::BuildMI(), llvm::TargetOpcode::COPY, createResultReg(), DL, FuncInfo, llvm::MCInstrInfo::get(), llvm::MCInstrDesc::getNumDefs(), llvm::MCInstrDesc::ImplicitDefs, llvm::FunctionLoweringInfo::InsertPt, llvm::RegState::Kill, llvm::FunctionLoweringInfo::MBB, and TII.

unsigned FastISel::FastEmitInst_rf	(	unsigned	MachineInstOpcode,
		const TargetRegisterClass *	RC,
		unsigned	Op0,
		bool	Op0IsKill,
		const ConstantFP *	FPImm
	)

protected

Emit a MachineInstr with two register operands and a result register in the given register class.

Definition at line 1324 of file FastISel.cpp.

References llvm::MachineInstrBuilder::addFPImm(), llvm::MachineInstrBuilder::addReg(), llvm::BuildMI(), llvm::TargetOpcode::COPY, createResultReg(), DL, FuncInfo, llvm::MCInstrInfo::get(), llvm::MCInstrDesc::getNumDefs(), llvm::MCInstrDesc::ImplicitDefs, llvm::FunctionLoweringInfo::InsertPt, llvm::RegState::Kill, llvm::FunctionLoweringInfo::MBB, and TII.

unsigned FastISel::FastEmitInst_ri	(	unsigned	MachineInstOpcode,
		const TargetRegisterClass *	RC,
		unsigned	Op0,
		bool	Op0IsKill,
		uint64_t	Imm
	)

protected

Emit a MachineInstr with a register operand, an immediate, and a result register in the given register class.

Definition at line 1280 of file FastISel.cpp.

References llvm::MachineInstrBuilder::addImm(), llvm::MachineInstrBuilder::addReg(), llvm::BuildMI(), llvm::TargetOpcode::COPY, createResultReg(), DL, FuncInfo, llvm::MCInstrInfo::get(), llvm::MCInstrDesc::getNumDefs(), llvm::MCInstrDesc::ImplicitDefs, llvm::FunctionLoweringInfo::InsertPt, llvm::RegState::Kill, llvm::FunctionLoweringInfo::MBB, and TII.

unsigned FastISel::FastEmitInst_rii	(	unsigned	MachineInstOpcode,
		const TargetRegisterClass *	RC,
		unsigned	Op0,
		bool	Op0IsKill,
		uint64_t	Imm1,
		uint64_t	Imm2
	)

protected

Emit a MachineInstr with one register operand and two immediate operands.

Definition at line 1301 of file FastISel.cpp.

References llvm::MachineInstrBuilder::addImm(), llvm::MachineInstrBuilder::addReg(), llvm::BuildMI(), llvm::TargetOpcode::COPY, createResultReg(), DL, FuncInfo, llvm::MCInstrInfo::get(), llvm::MCInstrDesc::getNumDefs(), llvm::MCInstrDesc::ImplicitDefs, llvm::FunctionLoweringInfo::InsertPt, llvm::RegState::Kill, llvm::FunctionLoweringInfo::MBB, and TII.

unsigned FastISel::FastEmitInst_rr	(	unsigned	MachineInstOpcode,
		const TargetRegisterClass *	RC,
		unsigned	Op0,
		bool	Op0IsKill,
		unsigned	Op1,
		bool	Op1IsKill
	)

protected

Emit a MachineInstr with two register operands and a result register in the given register class.

Definition at line 1235 of file FastISel.cpp.

References llvm::MachineInstrBuilder::addReg(), llvm::BuildMI(), llvm::TargetOpcode::COPY, createResultReg(), DL, FuncInfo, llvm::MCInstrInfo::get(), llvm::MCInstrDesc::getNumDefs(), llvm::MCInstrDesc::ImplicitDefs, llvm::FunctionLoweringInfo::InsertPt, llvm::RegState::Kill, llvm::FunctionLoweringInfo::MBB, and TII.

unsigned FastISel::FastEmitInst_rri	(	unsigned	MachineInstOpcode,
		const TargetRegisterClass *	RC,
		unsigned	Op0,
		bool	Op0IsKill,
		unsigned	Op1,
		bool	Op1IsKill,
		uint64_t	Imm
	)

protected

Emit a MachineInstr with two register operands, an immediate, and a result register in the given register class.

Definition at line 1345 of file FastISel.cpp.

References llvm::MachineInstrBuilder::addImm(), llvm::MachineInstrBuilder::addReg(), llvm::BuildMI(), llvm::TargetOpcode::COPY, createResultReg(), DL, FuncInfo, llvm::MCInstrInfo::get(), llvm::MCInstrDesc::getNumDefs(), llvm::MCInstrDesc::ImplicitDefs, llvm::FunctionLoweringInfo::InsertPt, llvm::RegState::Kill, llvm::FunctionLoweringInfo::MBB, and TII.

unsigned FastISel::FastEmitInst_rrii	(	unsigned	MachineInstOpcode,
		const TargetRegisterClass *	RC,
		unsigned	Op0,
		bool	Op0IsKill,
		unsigned	Op1,
		bool	Op1IsKill,
		uint64_t	Imm1,
		uint64_t	Imm2
	)

protected

Emit a MachineInstr with two register operands, two immediates operands, and a result register in the given register class.

Definition at line 1369 of file FastISel.cpp.

References llvm::MachineInstrBuilder::addImm(), llvm::MachineInstrBuilder::addReg(), llvm::BuildMI(), llvm::TargetOpcode::COPY, createResultReg(), DL, FuncInfo, llvm::MCInstrInfo::get(), llvm::MCInstrDesc::getNumDefs(), llvm::MCInstrDesc::ImplicitDefs, llvm::FunctionLoweringInfo::InsertPt, llvm::RegState::Kill, llvm::FunctionLoweringInfo::MBB, and TII.

unsigned FastISel::FastEmitInst_rrr	(	unsigned	MachineInstOpcode,
		const TargetRegisterClass *	RC,
		unsigned	Op0,
		bool	Op0IsKill,
		unsigned	Op1,
		bool	Op1IsKill,
		unsigned	Op2,
		bool	Op2IsKill
	)

protected

Emit a MachineInstr with three register operands and a result register in the given register class.

Definition at line 1256 of file FastISel.cpp.

References llvm::MachineInstrBuilder::addReg(), llvm::BuildMI(), llvm::TargetOpcode::COPY, createResultReg(), DL, FuncInfo, llvm::MCInstrInfo::get(), llvm::MCInstrDesc::getNumDefs(), llvm::MCInstrDesc::ImplicitDefs, llvm::FunctionLoweringInfo::InsertPt, llvm::RegState::Kill, llvm::FunctionLoweringInfo::MBB, and TII.

unsigned FastISel::FastEmitZExtFromI1	(	MVT	VT,
		unsigned	Op0,
		bool	Op0IsKill
	)

protected

Emit MachineInstrs to compute the value of Op with all but the least significant bit set to zero.

FastEmitZExtFromI1 - Emit MachineInstrs to compute the value of Op with all but the least significant bit set to zero.

Definition at line 1442 of file FastISel.cpp.

References llvm::ISD::AND, and FastEmit_ri().

bool FastISel::FastLowerArguments ( )

protectedvirtual

This method is called by target-independent code to do target specific argument lowering. It returns true if it was successful.

Definition at line 1108 of file FastISel.cpp.

Referenced by LowerArguments().

DebugLoc llvm::FastISel::getCurDebugLoc ( ) const

inline

Return current debug location information.

Definition at line 90 of file FastISel.h.

References DL.

MachineInstr* llvm::FastISel::getLastLocalValue ( )

inline

Return the position of the last instruction emitted for materializing constants for use in the current block.

Definition at line 76 of file FastISel.h.

References LastLocalValue.

Referenced by recomputeInsertPt().

std::pair< unsigned, bool > FastISel::getRegForGEPIndex ( const Value * V )

This is a wrapper around getRegForValue that also takes care of truncating or sign-extending the given getelementptr index value.

Definition at line 286 of file FastISel.cpp.

References llvm::EVT::bitsGT(), llvm::EVT::bitsLT(), FastEmit_r(), llvm::EVT::getEVT(), llvm::TargetLoweringBase::getPointerTy(), getRegForValue(), llvm::EVT::getSimpleVT(), llvm::Value::getType(), llvm::ISD::SIGN_EXTEND, TLI, and llvm::ISD::TRUNCATE.

unsigned FastISel::getRegForValue ( const Value * V )

Create a virtual register and arrange for it to be assigned the value for the given LLVM value.

Definition at line 139 of file FastISel.cpp.

References enterLocalValueArea(), FuncInfo, llvm::Value::getContext(), llvm::EVT::getSimpleVT(), llvm::Value::getType(), llvm::TargetLoweringBase::getTypeToTransformTo(), llvm::TargetLoweringBase::getValueType(), llvm::MVT::i1, llvm::MVT::i16, llvm::MVT::i8, llvm::FunctionLoweringInfo::InitializeRegForValue(), llvm::EVT::isSimple(), llvm::TargetLoweringBase::isTypeLegal(), leaveLocalValueArea(), lookUpRegForValue(), llvm::FunctionLoweringInfo::StaticAllocaMap, and TLI.

Referenced by FastEmit_ri_(), getRegForGEPIndex(), SelectOperator(), and tryToFoldLoad().

void FastISel::leaveLocalValueArea ( SavePoint Old )

Reset InsertPt to the given old insert position.

Definition at line 345 of file FastISel.cpp.

References llvm::MachineBasicBlock::begin(), DL, llvm::FastISel::SavePoint::DL, FuncInfo, llvm::FunctionLoweringInfo::InsertPt, llvm::FastISel::SavePoint::InsertPt, LastLocalValue, llvm::FunctionLoweringInfo::MBB, and llvm::prior().

Referenced by getRegForValue().

unsigned FastISel::lookUpRegForValue ( const Value * V )

Look up the value to see if its value is already cached in a register. It may be defined by instructions across blocks or defined locally.

Definition at line 250 of file FastISel.cpp.

References llvm::DenseMapBase< DerivedT, KeyT, ValueT, KeyInfoT >::end(), llvm::DenseMapBase< DerivedT, KeyT, ValueT, KeyInfoT >::find(), FuncInfo, LocalValueMap, and llvm::FunctionLoweringInfo::ValueMap.

Referenced by getRegForValue().

bool FastISel::LowerArguments ( )

Do "fast" instruction selection for function arguments and append machine instructions to the current block. Return true if it is successful.

Definition at line 88 of file FastISel.cpp.

References llvm::Function::arg_begin(), llvm::Function::arg_end(), llvm::FunctionLoweringInfo::CanLowerReturn, llvm::DenseMapBase< DerivedT, KeyT, ValueT, KeyInfoT >::end(), FastLowerArguments(), llvm::DenseMapBase< DerivedT, KeyT, ValueT, KeyInfoT >::find(), llvm::FunctionLoweringInfo::Fn, FuncInfo, I, LocalValueMap, and llvm::FunctionLoweringInfo::ValueMap.

void FastISel::recomputeInsertPt ( )

Reset InsertPt to prepare for inserting instructions into the current block.

Definition at line 310 of file FastISel.cpp.

References llvm::TargetOpcode::EH_LABEL, llvm::MachineBasicBlock::end(), FuncInfo, llvm::MachineBasicBlock::getFirstNonPHI(), getLastLocalValue(), llvm::FunctionLoweringInfo::InsertPt, and llvm::FunctionLoweringInfo::MBB.

Referenced by enterLocalValueArea(), removeDeadCode(), and SelectInstruction().

void FastISel::removeDeadCode	(	MachineBasicBlock::iterator	I,
		MachineBasicBlock::iterator	E
	)

Remove all dead instructions between the I and E.

Definition at line 324 of file FastISel.cpp.

References llvm::RegState::Dead, llvm::MachineInstr::eraseFromParent(), I, and recomputeInsertPt().

Referenced by SelectInstruction().

bool FastISel::SelectInstruction ( const Instruction * I )

Do "fast" instruction selection for the given LLVM IR instruction, and append generated machine instructions to the current block. Return true if selection was successful.

Definition at line 818 of file FastISel.cpp.

References DL, FuncInfo, llvm::CallInst::getCalledFunction(), llvm::Instruction::getDebugLoc(), llvm::TargetLibraryInfo::getLibFunc(), llvm::Value::getName(), llvm::Instruction::getOpcode(), llvm::Instruction::getParent(), llvm::GlobalValue::hasLocalLinkage(), llvm::Value::hasName(), llvm::TargetLibraryInfo::hasOptimizedCodeGen(), llvm::FunctionLoweringInfo::InsertPt, LibInfo, recomputeInsertPt(), removeDeadCode(), SelectOperator(), and TargetSelectInstruction().

bool FastISel::SelectOperator	(	const User *	I,
		unsigned	Opcode
	)

Do "fast" instruction selection for the given LLVM IR operator (Instruction or ConstantExpr), and append generated machine instructions to the current block. Return true if selection was successful.

Definition at line 977 of file FastISel.cpp.

References llvm::ISD::ADD, llvm::ISD::AND, llvm::APIntOps::And(), llvm::EVT::bitsGT(), llvm::EVT::bitsLT(), llvm::Call, llvm::ISD::FADD, FastEmitBranch(), llvm::ISD::FDIV, llvm::ISD::FMUL, llvm::ISD::FP_TO_SINT, llvm::ISD::FREM, llvm::ISD::FSUB, FuncInfo, llvm::Instruction::getDebugLoc(), llvm::User::getOperand(), getRegForValue(), llvm::BranchInst::getSuccessor(), llvm::Value::getType(), llvm::TargetLoweringBase::getValueType(), I, llvm::BinaryOperator::isFNeg(), llvm::BranchInst::isUnconditional(), llvm_unreachable, llvm::FunctionLoweringInfo::MBBMap, llvm::ISD::MUL, llvm::ISD::OR, llvm::APIntOps::Or(), llvm::TargetOpcode::PHI, llvm::ISD::SDIV, llvm::ISD::SHL, llvm::ISD::SIGN_EXTEND, llvm::ISD::SINT_TO_FP, llvm::ISD::SRA, llvm::ISD::SREM, llvm::ISD::SRL, llvm::FunctionLoweringInfo::StaticAllocaMap, llvm::ISD::SUB, TLI, llvm::ISD::TRUNCATE, llvm::ISD::UDIV, UpdateValueMap(), llvm::ISD::UREM, llvm::ISD::XOR, llvm::APIntOps::Xor(), and llvm::ISD::ZERO_EXTEND.

Referenced by SelectInstruction().

void llvm::FastISel::setLastLocalValue ( MachineInstr * I )

inline

Update the position of the last instruction emitted for materializing constants for use in the current block.

Definition at line 80 of file FastISel.h.

References EmitStartPt, I, and LastLocalValue.

void FastISel::startNewBlock ( )

Set the current block to which generated machine instructions will be appended, and clear the local CSE map.

startNewBlock - Set the current block to which generated machine instructions will be appended, and clear the local CSE map.

Definition at line 76 of file FastISel.cpp.

References llvm::MachineBasicBlock::back(), llvm::DenseMapBase< DerivedT, KeyT, ValueT, KeyInfoT >::clear(), EmitStartPt, llvm::MachineBasicBlock::empty(), FuncInfo, LastLocalValue, LocalValueMap, and llvm::FunctionLoweringInfo::MBB.

virtual unsigned llvm::FastISel::TargetMaterializeAlloca ( const AllocaInst * C )

inlineprotectedvirtual

Emit an alloca address in a register using target-specific logic.

Definition at line 353 of file FastISel.h.

virtual unsigned llvm::FastISel::TargetMaterializeConstant ( const Constant * C )

inlineprotectedvirtual

Emit a constant in a register using target-specific logic, such as constant pool loads.

Definition at line 348 of file FastISel.h.

virtual unsigned llvm::FastISel::TargetMaterializeFloatZero ( const ConstantFP * CF )

inlineprotectedvirtual

Definition at line 357 of file FastISel.h.

virtual bool llvm::FastISel::TargetSelectInstruction ( const Instruction * I )

protectedpure virtual

This method is called by target-independent code when the normal FastISel process fails to select an instruction. This gives targets a chance to emit code for anything that doesn't fit into FastISel's framework. It returns true if it was successful.

Referenced by SelectInstruction().

bool FastISel::tryToFoldLoad	(	const LoadInst *	LI,
		const Instruction *	FoldInst
	)

We're checking to see if we can fold LI into FoldInst. Note that we could have a sequence where multiple LLVM IR instructions are folded into the same machineinstr. For example we could have:

A: x = load i32 *P B: y = icmp A, 42 C: br y, ...

In this scenario, LI is "A", and FoldInst is "C". We know about "B" (and any other folded instructions) because it is between A and C.

If we succeed folding, return true.

Definition at line 1518 of file FastISel.cpp.

References FuncInfo, llvm::MachineRegisterInfo::defusechain_iterator< Uses, Defs, SkipDebug >::getOperandNo(), llvm::Instruction::getParent(), llvm::MachineInstr::getParent(), getRegForValue(), llvm::Value::hasOneUse(), llvm::MachineRegisterInfo::hasOneUse(), llvm::FunctionLoweringInfo::InsertPt, llvm::LoadInst::isVolatile(), LI, llvm::FunctionLoweringInfo::MBB, MRI, llvm::MachineRegisterInfo::reg_begin(), tryToFoldLoadIntoMI(), and llvm::Instruction::use_back().

virtual bool llvm::FastISel::tryToFoldLoadIntoMI	(	MachineInstr *	,
		unsigned	,
		const LoadInst *
	)

inlinevirtual

The specified machine instr operand is a vreg, and that vreg is being provided by the specified load instruction. If possible, try to fold the load as an operand to the instruction, returning true if possible.

This method should be implemented by targets.

Definition at line 138 of file FastISel.h.

Referenced by tryToFoldLoad().

void FastISel::UpdateValueMap	(	const Value *	I,
		unsigned	Reg,
		unsigned	NumRegs = `1`
	)

protected

UpdateValueMap - Update the value map to include the new mapping for this instruction, or insert an extra copy to get the result in a previous determined register. NOTE: This is only necessary because we might select a block that uses a value before we select the block that defines the value. It might be possible to fix this by selecting blocks in reverse postorder.

Definition at line 267 of file FastISel.cpp.

References FuncInfo, I, LocalValueMap, llvm::FunctionLoweringInfo::RegFixups, and llvm::FunctionLoweringInfo::ValueMap.

Referenced by SelectOperator().

Member Data Documentation

DebugLoc llvm::FastISel::DL

protected

Definition at line 54 of file FastISel.h.

Referenced by enterLocalValueArea(), FastEmitInst_(), FastEmitInst_extractsubreg(), FastEmitInst_i(), FastEmitInst_ii(), FastEmitInst_r(), FastEmitInst_rf(), FastEmitInst_ri(), FastEmitInst_rii(), FastEmitInst_rr(), FastEmitInst_rri(), FastEmitInst_rrii(), FastEmitInst_rrr(), getCurDebugLoc(), leaveLocalValueArea(), and SelectInstruction().

MachineInstr* llvm::FastISel::EmitStartPt

protected

The top most instruction in the current block that is allowed for emitting local variables. LastLocalValue resets to EmitStartPt when it makes sense (for example, on function calls)

Definition at line 71 of file FastISel.h.

Referenced by setLastLocalValue(), and startNewBlock().

FunctionLoweringInfo& llvm::FastISel::FuncInfo

protected

MachineInstr* llvm::FastISel::LastLocalValue

protected

The position of the last instruction for materializing constants for use in the current block. It resets to EmitStartPt when it makes sense (for example, it's usually profitable to avoid function calls between the definition and the use)

Definition at line 66 of file FastISel.h.

Referenced by getLastLocalValue(), leaveLocalValueArea(), setLastLocalValue(), and startNewBlock().