llvm::LegalizationArtifactCombiner::ArtifactValueFinder Class Reference

This class provides utilities for finding source registers of specific bit ranges in an artifact. More...

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

Public Member Functions
	ArtifactValueFinder (MachineRegisterInfo &Mri, MachineIRBuilder &Builder, const LegalizerInfo &Info)
Register	findValueFromDef (Register DefReg, unsigned StartBit, unsigned Size)
	Try to find a source of the value defined in the def DefReg, starting at position StartBit with size Size.
bool	tryCombineUnmergeDefs (GUnmerge &MI, GISelChangeObserver &Observer, SmallVectorImpl< Register > &UpdatedDefs)
	Try to combine the defs of an unmerge MI by attempting to find values that provides the bits for each def reg.
GUnmerge *	findUnmergeThatDefinesReg (Register Reg, unsigned Size, unsigned &DefOperandIdx)
bool	isSequenceFromUnmerge (GMergeLikeInstr &MI, unsigned MergeStartIdx, GUnmerge *Unmerge, unsigned UnmergeIdxStart, unsigned NumElts, unsigned EltSize)
bool	tryCombineMergeLike (GMergeLikeInstr &MI, SmallVectorImpl< MachineInstr * > &DeadInsts, SmallVectorImpl< Register > &UpdatedDefs, GISelChangeObserver &Observer)

Detailed Description

This class provides utilities for finding source registers of specific bit ranges in an artifact.

The routines can look through the source registers if they're other artifacts to try to find a non-artifact source of a value.

Definition at line 556 of file LegalizationArtifactCombiner.h.

Constructor & Destructor Documentation

ArtifactValueFinder()

llvm::LegalizationArtifactCombiner::ArtifactValueFinder::ArtifactValueFinder ( MachineRegisterInfo &  Mri, MachineIRBuilder &  Builder, const LegalizerInfo &  Info  )

inline

Definition at line 768 of file LegalizationArtifactCombiner.h.

References Builder, and MRI.

Member Function Documentation

findUnmergeThatDefinesReg()

GUnmerge * llvm::LegalizationArtifactCombiner::ArtifactValueFinder::findUnmergeThatDefinesReg ( Register  Reg, unsigned  Size, unsigned &  DefOperandIdx  )

inline

Definition at line 815 of file LegalizationArtifactCombiner.h.

References MRI, Reg, and Size.

Referenced by isSequenceFromUnmerge(), and tryCombineMergeLike().

findValueFromDef()

Register llvm::LegalizationArtifactCombiner::ArtifactValueFinder::findValueFromDef ( Register  DefReg, unsigned  StartBit, unsigned  Size  )

inline

Try to find a source of the value defined in the def DefReg, starting at position StartBit with size Size.

Returns

a register with the requested size, or an empty Register if no better value could be found.

Definition at line 776 of file LegalizationArtifactCombiner.h.

References Size.

Referenced by tryCombineUnmergeDefs().

isSequenceFromUnmerge()

bool llvm::LegalizationArtifactCombiner::ArtifactValueFinder::isSequenceFromUnmerge ( GMergeLikeInstr &  MI, unsigned  MergeStartIdx, GUnmerge *  Unmerge, unsigned  UnmergeIdxStart, unsigned  NumElts, unsigned  EltSize  )

inline

Definition at line 829 of file LegalizationArtifactCombiner.h.

References assert(), findUnmergeThatDefinesReg(), and MI.

Referenced by tryCombineMergeLike().

tryCombineMergeLike()

bool llvm::LegalizationArtifactCombiner::ArtifactValueFinder::tryCombineMergeLike ( GMergeLikeInstr &  MI, SmallVectorImpl< MachineInstr * > &  DeadInsts, SmallVectorImpl< Register > &  UpdatedDefs, GISelChangeObserver &  Observer  )

inline

Definition at line 847 of file LegalizationArtifactCombiner.h.

References llvm::MachineIRBuilder::buildMergeLikeInstr(), llvm::MachineIRBuilder::buildUnmerge(), findUnmergeThatDefinesReg(), llvm::getCoverTy(), llvm::LLT::getSizeInBits(), isSequenceFromUnmerge(), llvm::LLT::isVector(), MI, MRI, llvm::SmallVectorTemplateBase< T, bool >::push_back(), llvm::LegalizationArtifactCombiner::replaceRegOrBuildCopy(), and llvm::MachineIRBuilder::setInstrAndDebugLoc().

Referenced by llvm::LegalizationArtifactCombiner::tryCombineInstruction().

tryCombineUnmergeDefs()

bool llvm::LegalizationArtifactCombiner::ArtifactValueFinder::tryCombineUnmergeDefs ( GUnmerge &  MI, GISelChangeObserver &  Observer, SmallVectorImpl< Register > &  UpdatedDefs  )

inline

Try to combine the defs of an unmerge MI by attempting to find values that provides the bits for each def reg.

Returns

true if all the defs of the unmerge have been made dead.

Definition at line 786 of file LegalizationArtifactCombiner.h.

References llvm::SmallBitVector::all(), llvm::GISelChangeObserver::changedInstr(), llvm::GISelChangeObserver::changingInstr(), findValueFromDef(), llvm::LLT::getSizeInBits(), MI, MRI, and llvm::LegalizationArtifactCombiner::replaceRegOrBuildCopy().

Referenced by llvm::LegalizationArtifactCombiner::tryCombineUnmergeValues().

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

• include/llvm/CodeGen/GlobalISel/LegalizationArtifactCombiner.h