LLVM 22.0.0git
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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, LLT DstTy)
 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 AllowUndef)
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 610 of file LegalizationArtifactCombiner.h.

Constructor & Destructor Documentation

◆ ArtifactValueFinder()

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

Definition at line 886 of file LegalizationArtifactCombiner.h.

References Info.

Member Function Documentation

◆ findUnmergeThatDefinesReg()

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

Definition at line 934 of file LegalizationArtifactCombiner.h.

References llvm::dyn_cast(), Reg, and Size.

Referenced by isSequenceFromUnmerge(), and tryCombineMergeLike().

◆ findValueFromDef()

Register llvm::LegalizationArtifactCombiner::ArtifactValueFinder::findValueFromDef ( Register DefReg,
unsigned StartBit,
unsigned Size,
LLT DstTy )
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 894 of file LegalizationArtifactCombiner.h.

References Register, and Size.

Referenced by llvm::LegalizationArtifactCombiner::tryCombineTrunc(), and tryCombineUnmergeDefs().

◆ isSequenceFromUnmerge()

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

Definition at line 949 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 971 of file LegalizationArtifactCombiner.h.

References findUnmergeThatDefinesReg(), llvm::getCoverTy(), llvm::LLT::getScalarType(), llvm::LLT::getSizeInBits(), isSequenceFromUnmerge(), llvm::LLT::isVector(), MI, llvm::SmallVectorTemplateBase< T, bool >::push_back(), and llvm::LegalizationArtifactCombiner::replaceRegOrBuildCopy().

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 904 of file LegalizationArtifactCombiner.h.

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

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

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