LLVM 17.0.0git
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llvm::InstructionSelector Class Referenceabstract

Provides the logic to select generic machine instructions. More...

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

Inheritance diagram for llvm::InstructionSelector:
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Classes

struct  ISelInfoTy
 
struct  MatcherState
 

Public Member Functions

virtual ~InstructionSelector ()=default
 
virtual bool select (MachineInstr &I)=0
 Select the (possibly generic) instruction I to only use target-specific opcodes.
 
virtual void setupGeneratedPerFunctionState (MachineFunction &MF)
 
virtual void setupMF (MachineFunction &mf, GISelKnownBits *KB, CodeGenCoverage &covinfo, ProfileSummaryInfo *psi, BlockFrequencyInfo *bfi)
 Setup per-MF selector state.
 

Public Attributes

CodeGenCoverage * CoverageInfo = nullptr
 
GISelKnownBits * KnownBits = nullptr
 
MachineFunction * MF = nullptr
 
ProfileSummaryInfo * PSI = nullptr
 
BlockFrequencyInfo * BFI = nullptr
 
MachineBasicBlock * CurMBB = nullptr
 

Protected Types

using ComplexRendererFns = std::optional< SmallVector< std::function< void(MachineInstrBuilder &)>, 4 > >
 
using RecordedMIVector = SmallVector< MachineInstr *, 4 >
 
using NewMIVector = SmallVector< MachineInstrBuilder, 4 >
 

Protected Member Functions

bool shouldOptForSize (const MachineFunction *MF) const
 
 InstructionSelector ()
 
template<class TgtInstructionSelector , class PredicateBitset , class ComplexMatcherMemFn , class CustomRendererFn >
bool executeMatchTable (TgtInstructionSelector &ISel, NewMIVector &OutMIs, MatcherState &State, const ISelInfoTy< PredicateBitset, ComplexMatcherMemFn, CustomRendererFn > &ISelInfo, const int64_t *MatchTable, const TargetInstrInfo &TII, MachineRegisterInfo &MRI, const TargetRegisterInfo &TRI, const RegisterBankInfo &RBI, const PredicateBitset &AvailableFeatures, CodeGenCoverage &CoverageInfo) const
 Execute a given matcher table and return true if the match was successful and false otherwise.
 
virtual const int64_t * getMatchTable () const
 
virtual bool testImmPredicate_I64 (unsigned, int64_t) const
 
virtual bool testImmPredicate_APInt (unsigned, const APInt &) const
 
virtual bool testImmPredicate_APFloat (unsigned, const APFloat &) const
 
virtual bool testMIPredicate_MI (unsigned, const MachineInstr &, const std::array< const MachineOperand *, 3 > &Operands) const
 
bool isOperandImmEqual (const MachineOperand &MO, int64_t Value, const MachineRegisterInfo &MRI) const
 
bool isBaseWithConstantOffset (const MachineOperand &Root, const MachineRegisterInfo &MRI) const
 Return true if the specified operand is a G_PTR_ADD with a G_CONSTANT on the right-hand side.
 
bool isObviouslySafeToFold (MachineInstr &MI, MachineInstr &IntoMI) const
 Return true if MI can obviously be folded into IntoMI.
 

Detailed Description

Provides the logic to select generic machine instructions.

Definition at line 442 of file InstructionSelector.h.

Member Typedef Documentation

◆ ComplexRendererFns

using llvm::InstructionSelector::ComplexRendererFns = std::optional<SmallVector<std::function<void(MachineInstrBuilder &)>, 4> >
protected

Definition at line 484 of file InstructionSelector.h.

◆ NewMIVector

using llvm::InstructionSelector::NewMIVector = SmallVector<MachineInstrBuilder, 4>
protected

Definition at line 487 of file InstructionSelector.h.

◆ RecordedMIVector

using llvm::InstructionSelector::RecordedMIVector = SmallVector<MachineInstr *, 4>
protected

Definition at line 486 of file InstructionSelector.h.

Constructor & Destructor Documentation

◆ ~InstructionSelector()

virtual llvm::InstructionSelector::~InstructionSelector ( )
virtualdefault

◆ InstructionSelector()

InstructionSelector::InstructionSelector ( )
protecteddefault

Member Function Documentation

◆ executeMatchTable()

template<class TgtInstructionSelector , class PredicateBitset , class ComplexMatcherMemFn , class CustomRendererFn >
bool llvm::InstructionSelector::executeMatchTable ( TgtInstructionSelector &  ISel,
NewMIVector &  OutMIs,
MatcherState &  State,
const ISelInfoTy< PredicateBitset, ComplexMatcherMemFn, CustomRendererFn > &  ISelInfo,
const int64_t *  MatchTable,
const TargetInstrInfo &  TII,
MachineRegisterInfo &  MRI,
const TargetRegisterInfo &  TRI,
const RegisterBankInfo &  RBI,
const PredicateBitset &  AvailableFeatures,
CodeGenCoverage &  CoverageInfo 
) const
protected

Execute a given matcher table and return true if the match was successful and false otherwise.

Definition at line 50 of file InstructionSelectorImpl.h.

References assert(), llvm::BuildMI(), llvm::InstructionSelector::ISelInfoTy< PredicateBitset, ComplexMatcherMemFn, CustomRendererFn >::ComplexPredicates, llvm::constrainOperandRegClass(), llvm::constrainSelectedInstRegOperands(), CoverageInfo, llvm::InstructionSelector::ISelInfoTy< PredicateBitset, ComplexMatcherMemFn, CustomRendererFn >::CustomRenderers, llvm::dbgs(), DEBUG_WITH_TYPE, llvm::Default, llvm::SmallVectorBase< Size_T >::empty(), llvm::ConstantInt::equalsInt(), llvm::InstructionSelector::ISelInfoTy< PredicateBitset, ComplexMatcherMemFn, CustomRendererFn >::FeatureBitsets, Flags, llvm::LLT::getAddressSpace(), llvm::MachineMemOperand::getAddrSpace(), llvm::MachineMemOperand::getAlign(), llvm::MachineOperand::getCImm(), llvm::MachineFunction::getDataLayout(), llvm::getDefIgnoringCopies(), llvm::MachineOperand::getImm(), llvm::MachineOperand::getIntrinsicID(), llvm::DataLayout::getPointerSizeInBits(), llvm::MachineOperand::getPredicate(), llvm::MachineOperand::getReg(), llvm::RegisterBankInfo::getRegBank(), llvm::RegisterBankInfo::getRegBankFromRegClass(), llvm::MachineFunction::getRegInfo(), llvm::MachineMemOperand::getSize(), llvm::LLT::getSizeInBits(), llvm::MachineMemOperand::getSizeInBits(), llvm::GIM_CheckAPFloatImmPredicate, llvm::GIM_CheckAPIntImmPredicate, llvm::GIM_CheckAtomicOrdering, llvm::GIM_CheckAtomicOrderingOrStrongerThan, llvm::GIM_CheckAtomicOrderingWeakerThan, llvm::GIM_CheckCmpPredicate, llvm::GIM_CheckComplexPattern, llvm::GIM_CheckConstantInt, llvm::GIM_CheckCxxInsnPredicate, llvm::GIM_CheckFeatures, llvm::GIM_CheckHasNoUse, llvm::GIM_CheckI64ImmPredicate, llvm::GIM_CheckImmOperandPredicate, llvm::GIM_CheckIntrinsicID, llvm::GIM_CheckIsBuildVectorAllOnes, llvm::GIM_CheckIsBuildVectorAllZeros, llvm::GIM_CheckIsImm, llvm::GIM_CheckIsMBB, llvm::GIM_CheckIsSafeToFold, llvm::GIM_CheckIsSameOperand, llvm::GIM_CheckIsSameOperandIgnoreCopies, llvm::GIM_CheckLiteralInt, llvm::GIM_CheckMemoryAddressSpace, llvm::GIM_CheckMemoryAlignment, llvm::GIM_CheckMemorySizeEqualTo, llvm::GIM_CheckMemorySizeEqualToLLT, llvm::GIM_CheckMemorySizeGreaterThanLLT, llvm::GIM_CheckMemorySizeLessThanLLT, llvm::GIM_CheckNumOperands, llvm::GIM_CheckOpcode, llvm::GIM_CheckOpcodeIsEither, llvm::GIM_CheckPointerToAny, llvm::GIM_CheckRegBankForClass, llvm::GIM_CheckType, llvm::GIM_RecordInsn, llvm::GIM_RecordInsnIgnoreCopies, llvm::GIM_RecordNamedOperand, llvm::GIM_Reject, llvm::GIM_SwitchOpcode, llvm::GIM_SwitchType, llvm::GIM_Try, llvm::GIPFP_APFloat_Invalid, llvm::GIPFP_APInt_Invalid, llvm::GIPFP_I64_Invalid, llvm::GIPFP_MI_Invalid, llvm::GIR_AddImm, llvm::GIR_AddImplicitDef, llvm::GIR_AddImplicitUse, llvm::GIR_AddRegister, llvm::GIR_AddTempRegister, llvm::GIR_AddTempSubRegister, llvm::GIR_BuildMI, llvm::GIR_ComplexRenderer, llvm::GIR_ComplexSubOperandRenderer, llvm::GIR_ComplexSubOperandSubRegRenderer, llvm::GIR_ConstrainOperandRC, llvm::GIR_ConstrainSelectedInstOperands, llvm::GIR_Copy, llvm::GIR_CopyConstantAsSImm, llvm::GIR_CopyFConstantAsFPImm, llvm::GIR_CopyOrAddZeroReg, llvm::GIR_CopySubReg, llvm::GIR_Coverage, llvm::GIR_CustomOperandRenderer, llvm::GIR_CustomRenderer, llvm::GIR_Done, llvm::GIR_EraseFromParent, llvm::GIR_MakeTempReg, llvm::GIR_MergeMemOperands, llvm::GIR_MutateOpcode, llvm::GIU_MergeMemOperands_EndOfList, I, llvm::RegState::Implicit, llvm::isAtLeastOrStrongerThan(), llvm::isBuildVectorAllOnes(), llvm::isBuildVectorAllZeros(), llvm::MachineOperand::isCImm(), llvm::MachineOperand::isImm(), llvm::MachineOperand::isIntrinsicID(), isObviouslySafeToFold(), isOperandImmEqual(), llvm::Register::isPhysical(), llvm::LLT::isPointer(), llvm::MachineOperand::isPredicate(), llvm::MachineOperand::isReg(), llvm::isStrongerThan(), llvm_unreachable, MF, MI, llvm::MinAlign(), llvm::InstructionSelector::MatcherState::MIs, MRI, llvm::MachineInstr::NoFPExcept, llvm::SmallVectorImpl< T >::pop_back_val(), llvm::SmallVectorTemplateBase< T, bool >::push_back(), llvm::InstructionSelector::MatcherState::RecordedOperands, llvm::InstructionSelector::MatcherState::Renderers, llvm::SmallVectorImpl< T >::resize(), llvm::CodeGenCoverage::setCovered(), llvm::SignExtend64(), llvm::SmallVectorBase< Size_T >::size(), Size, SubReg, Success, llvm::InstructionSelector::MatcherState::TempRegisters, testImmPredicate_APFloat(), testImmPredicate_APInt(), testImmPredicate_I64(), testMIPredicate_MI(), TII, TRI, llvm::InstructionSelector::ISelInfoTy< PredicateBitset, ComplexMatcherMemFn, CustomRendererFn >::TypeIDMap, and llvm::InstructionSelector::ISelInfoTy< PredicateBitset, ComplexMatcherMemFn, CustomRendererFn >::TypeObjects.

◆ getMatchTable()

virtual const int64_t * llvm::InstructionSelector::getMatchTable ( ) const
inlineprotectedvirtual

Definition at line 548 of file InstructionSelector.h.

References llvm_unreachable.

◆ isBaseWithConstantOffset()

bool InstructionSelector::isBaseWithConstantOffset ( const MachineOperand &  Root,
const MachineRegisterInfo &  MRI 
) const
protected

Return true if the specified operand is a G_PTR_ADD with a G_CONSTANT on the right-hand side.

GlobalISel's separation of pointer and integer types means that we don't need to worry about G_OR with equivalent semantics.

Definition at line 38 of file InstructionSelector.cpp.

References llvm::MachineInstr::getOpcode(), llvm::MachineInstr::getOperand(), llvm::MachineOperand::getReg(), llvm::MachineOperand::isReg(), MRI, and RHS.

◆ isObviouslySafeToFold()

bool InstructionSelector::isObviouslySafeToFold ( MachineInstr &  MI,
MachineInstr &  IntoMI 
) const
protected

Return true if MI can obviously be folded into IntoMI.

MI and IntoMI do not need to be in the same basic blocks, but MI must preceed IntoMI.

Definition at line 55 of file InstructionSelector.cpp.

References llvm::ilist_node_impl< OptionsT >::getIterator(), llvm::MachineInstr::getParent(), and MI.

Referenced by executeMatchTable().

◆ isOperandImmEqual()

bool InstructionSelector::isOperandImmEqual ( const MachineOperand &  MO,
int64_t  Value,
const MachineRegisterInfo &  MRI 
) const
protected

Definition at line 29 of file InstructionSelector.cpp.

References llvm::getIConstantVRegValWithLookThrough(), llvm::MachineOperand::getReg(), llvm::MachineOperand::isReg(), and MRI.

Referenced by executeMatchTable().

◆ select()

virtual bool llvm::InstructionSelector::select ( MachineInstr &  I)
pure virtual

Select the (possibly generic) instruction I to only use target-specific opcodes.

It is OK to insert multiple instructions, but they cannot be generic pre-isel instructions.

Returns
whether selection succeeded.
Precondition
I.getParent() && I.getParent()->getParent()
Postcondition
if returns true: for I in all mutated/inserted instructions: !isPreISelGenericOpcode(I.getOpcode())

Implemented in llvm::AMDGPUInstructionSelector.

Referenced by llvm::InstructionSelect::runOnMachineFunction().

◆ setupGeneratedPerFunctionState()

virtual void llvm::InstructionSelector::setupGeneratedPerFunctionState ( MachineFunction &  MF)
inlinevirtual

Definition at line 466 of file InstructionSelector.h.

References llvm_unreachable.

Referenced by setupMF().

◆ setupMF()

virtual void llvm::InstructionSelector::setupMF ( MachineFunction &  mf,
GISelKnownBits *  KB,
CodeGenCoverage &  covinfo,
ProfileSummaryInfo *  psi,
BlockFrequencyInfo *  bfi 
)
inlinevirtual

Setup per-MF selector state.

Reimplemented in llvm::AMDGPUInstructionSelector.

Definition at line 471 of file InstructionSelector.h.

References BFI, CoverageInfo, CurMBB, MF, PSI, and setupGeneratedPerFunctionState().

Referenced by llvm::InstructionSelect::runOnMachineFunction(), and llvm::AMDGPUInstructionSelector::setupMF().

◆ shouldOptForSize()

bool llvm::InstructionSelector::shouldOptForSize ( const MachineFunction *  MF) const
inlineprotected

Definition at line 502 of file InstructionSelector.h.

References BFI, CurMBB, F, llvm::MachineFunction::getFunction(), MF, PSI, and llvm::shouldOptForSize().

◆ testImmPredicate_APFloat()

virtual bool llvm::InstructionSelector::testImmPredicate_APFloat ( unsigned  ,
const APFloat &   
) const
inlineprotectedvirtual

Definition at line 560 of file InstructionSelector.h.

References llvm_unreachable.

Referenced by executeMatchTable().

◆ testImmPredicate_APInt()

virtual bool llvm::InstructionSelector::testImmPredicate_APInt ( unsigned  ,
const APInt &   
) const
inlineprotectedvirtual

Definition at line 556 of file InstructionSelector.h.

References llvm_unreachable.

Referenced by executeMatchTable().

◆ testImmPredicate_I64()

virtual bool llvm::InstructionSelector::testImmPredicate_I64 ( unsigned  ,
int64_t   
) const
inlineprotectedvirtual

Definition at line 552 of file InstructionSelector.h.

References llvm_unreachable.

Referenced by executeMatchTable().

◆ testMIPredicate_MI()

virtual bool llvm::InstructionSelector::testMIPredicate_MI ( unsigned  ,
const MachineInstr &  ,
const std::array< const MachineOperand *, 3 > &  Operands 
) const
inlineprotectedvirtual

Definition at line 564 of file InstructionSelector.h.

References llvm_unreachable.

Referenced by executeMatchTable().

Member Data Documentation

◆ BFI

BlockFrequencyInfo* llvm::InstructionSelector::BFI = nullptr

Definition at line 462 of file InstructionSelector.h.

Referenced by llvm::AMDGPUInstructionSelector::setupMF(), setupMF(), and shouldOptForSize().

◆ CoverageInfo

CodeGenCoverage* llvm::InstructionSelector::CoverageInfo = nullptr

Definition at line 458 of file InstructionSelector.h.

Referenced by executeMatchTable(), llvm::AMDGPUInstructionSelector::select(), llvm::AMDGPUInstructionSelector::setupMF(), and setupMF().

◆ CurMBB

MachineBasicBlock* llvm::InstructionSelector::CurMBB = nullptr

Definition at line 464 of file InstructionSelector.h.

Referenced by llvm::InstructionSelect::runOnMachineFunction(), setupMF(), and shouldOptForSize().

◆ KnownBits

GISelKnownBits* llvm::InstructionSelector::KnownBits = nullptr

Definition at line 459 of file InstructionSelector.h.

◆ MF

MachineFunction* llvm::InstructionSelector::MF = nullptr

Definition at line 460 of file InstructionSelector.h.

Referenced by executeMatchTable(), llvm::AMDGPUInstructionSelector::setupMF(), setupMF(), and shouldOptForSize().

◆ PSI

ProfileSummaryInfo* llvm::InstructionSelector::PSI = nullptr

Definition at line 461 of file InstructionSelector.h.

Referenced by llvm::AMDGPUInstructionSelector::setupMF(), setupMF(), and shouldOptForSize().

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