LLVM 20.0.0git
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llvm::LazyValueInfo Class Reference

This pass computes, caches, and vends lazy value constraint information. More...

#include "llvm/Analysis/LazyValueInfo.h"

Public Member Functions

 ~LazyValueInfo ()
 
 LazyValueInfo ()=default
 
 LazyValueInfo (AssumptionCache *AC_, const DataLayout *DL_)
 
 LazyValueInfo (LazyValueInfo &&Arg)
 
LazyValueInfooperator= (LazyValueInfo &&Arg)
 
ConstantgetPredicateOnEdge (CmpInst::Predicate Pred, Value *V, Constant *C, BasicBlock *FromBB, BasicBlock *ToBB, Instruction *CxtI=nullptr)
 Determine whether the specified value comparison with a constant is known to be true or false on the specified CFG edge.
 
ConstantgetPredicateAt (CmpInst::Predicate Pred, Value *V, Constant *C, Instruction *CxtI, bool UseBlockValue)
 Determine whether the specified value comparison with a constant is known to be true or false at the specified instruction.
 
ConstantgetPredicateAt (CmpInst::Predicate Pred, Value *LHS, Value *RHS, Instruction *CxtI, bool UseBlockValue)
 Determine whether the specified value comparison is known to be true or false at the specified instruction.
 
ConstantgetConstant (Value *V, Instruction *CxtI)
 Determine whether the specified value is known to be a constant at the specified instruction.
 
ConstantRange getConstantRange (Value *V, Instruction *CxtI, bool UndefAllowed)
 Return the ConstantRange constraint that is known to hold for the specified value at the specified instruction.
 
ConstantRange getConstantRangeAtUse (const Use &U, bool UndefAllowed)
 Return the ConstantRange constraint that is known to hold for the value at a specific use-site.
 
ConstantgetConstantOnEdge (Value *V, BasicBlock *FromBB, BasicBlock *ToBB, Instruction *CxtI=nullptr)
 Determine whether the specified value is known to be a constant on the specified edge.
 
ConstantRange getConstantRangeOnEdge (Value *V, BasicBlock *FromBB, BasicBlock *ToBB, Instruction *CxtI=nullptr)
 Return the ConstantRage constraint that is known to hold for the specified value on the specified edge.
 
void threadEdge (BasicBlock *PredBB, BasicBlock *OldSucc, BasicBlock *NewSucc)
 Inform the analysis cache that we have threaded an edge from PredBB to OldSucc to be from PredBB to NewSucc instead.
 
void forgetValue (Value *V)
 Remove information related to this value from the cache.
 
void eraseBlock (BasicBlock *BB)
 Inform the analysis cache that we have erased a block.
 
void clear ()
 Complete flush all previously computed values.
 
void printLVI (Function &F, DominatorTree &DTree, raw_ostream &OS)
 Print the \LazyValueInfo Analysis.
 
void releaseMemory ()
 
bool invalidate (Function &F, const PreservedAnalyses &PA, FunctionAnalysisManager::Invalidator &Inv)
 Handle invalidation events in the new pass manager.
 

Friends

class LazyValueInfoWrapperPass
 

Detailed Description

This pass computes, caches, and vends lazy value constraint information.

Definition at line 32 of file LazyValueInfo.h.

Constructor & Destructor Documentation

◆ ~LazyValueInfo()

LazyValueInfo::~LazyValueInfo ( )

Definition at line 1678 of file LazyValueInfo.cpp.

References releaseMemory().

◆ LazyValueInfo() [1/3]

llvm::LazyValueInfo::LazyValueInfo ( )
default

◆ LazyValueInfo() [2/3]

llvm::LazyValueInfo::LazyValueInfo ( AssumptionCache AC_,
const DataLayout DL_ 
)
inline

Definition at line 46 of file LazyValueInfo.h.

◆ LazyValueInfo() [3/3]

llvm::LazyValueInfo::LazyValueInfo ( LazyValueInfo &&  Arg)
inline

Definition at line 48 of file LazyValueInfo.h.

Member Function Documentation

◆ clear()

void LazyValueInfo::clear ( )

Complete flush all previously computed values.

Definition at line 1990 of file LazyValueInfo.cpp.

◆ eraseBlock()

void LazyValueInfo::eraseBlock ( BasicBlock BB)

Inform the analysis cache that we have erased a block.

Definition at line 1985 of file LazyValueInfo.cpp.

Referenced by llvm::JumpThreadingPass::maybeMergeBasicBlockIntoOnlyPred(), and llvm::JumpThreadingPass::runImpl().

◆ forgetValue()

void LazyValueInfo::forgetValue ( Value V)

Remove information related to this value from the cache.

Definition at line 1980 of file LazyValueInfo.cpp.

Referenced by llvm::JumpThreadingPass::simplifyPartiallyRedundantLoad().

◆ getConstant()

Constant * LazyValueInfo::getConstant ( Value V,
Instruction CxtI 
)

◆ getConstantOnEdge()

Constant * LazyValueInfo::getConstantOnEdge ( Value V,
BasicBlock FromBB,
BasicBlock ToBB,
Instruction CxtI = nullptr 
)

◆ getConstantRange()

ConstantRange LazyValueInfo::getConstantRange ( Value V,
Instruction CxtI,
bool  UndefAllowed 
)

Return the ConstantRange constraint that is known to hold for the specified value at the specified instruction.

This may only be called on integer-typed Values.

Definition at line 1741 of file LazyValueInfo.cpp.

References llvm::BasicBlock::getModule(), llvm::ilist_detail::node_parent_access< NodeTy, ParentTy >::getParent(), and llvm::LazyValueInfoImpl::getValueInBlock().

◆ getConstantRangeAtUse()

ConstantRange LazyValueInfo::getConstantRangeAtUse ( const Use U,
bool  UndefAllowed 
)

◆ getConstantRangeOnEdge()

ConstantRange LazyValueInfo::getConstantRangeOnEdge ( Value V,
BasicBlock FromBB,
BasicBlock ToBB,
Instruction CxtI = nullptr 
)

Return the ConstantRage constraint that is known to hold for the specified value on the specified edge.

This may be only be called on integer-typed Values.

Definition at line 1776 of file LazyValueInfo.cpp.

References llvm::BasicBlock::getModule(), and llvm::LazyValueInfoImpl::getValueOnEdge().

Referenced by llvm::JumpThreadingPass::computeValueKnownInPredecessorsImpl().

◆ getPredicateAt() [1/2]

Constant * LazyValueInfo::getPredicateAt ( CmpInst::Predicate  Pred,
Value LHS,
Value RHS,
Instruction CxtI,
bool  UseBlockValue 
)

Determine whether the specified value comparison is known to be true or false at the specified instruction.

While this takes two Value's, it still requires that one of them is a constant. Pred is a CmpInst predicate. If UseBlockValue is true, the block value is also taken into account.

Definition at line 1947 of file LazyValueInfo.cpp.

References llvm::CallingConv::C, llvm::Instruction::getModule(), llvm::ilist_detail::node_parent_access< NodeTy, ParentTy >::getParent(), getPredicateAt(), llvm::CmpInst::getSwappedPredicate(), llvm::Value::getType(), llvm::LazyValueInfoImpl::getValueInBlock(), LHS, llvm::CmpInst::makeCmpResultType(), and RHS.

◆ getPredicateAt() [2/2]

Constant * LazyValueInfo::getPredicateAt ( CmpInst::Predicate  Pred,
Value V,
Constant C,
Instruction CxtI,
bool  UseBlockValue 
)

◆ getPredicateOnEdge()

Constant * LazyValueInfo::getPredicateOnEdge ( CmpInst::Predicate  Pred,
Value V,
Constant C,
BasicBlock FromBB,
BasicBlock ToBB,
Instruction CxtI = nullptr 
)

Determine whether the specified value comparison with a constant is known to be true or false on the specified CFG edge.

Pred is a CmpInst predicate.

Definition at line 1829 of file LazyValueInfo.cpp.

References llvm::CallingConv::C, llvm::BasicBlock::getModule(), getPredicateResult(), and llvm::LazyValueInfoImpl::getValueOnEdge().

Referenced by llvm::JumpThreadingPass::computeValueKnownInPredecessorsImpl(), getPredicateAt(), getValueOnEdge(), and llvm::JumpThreadingPass::tryToUnfoldSelect().

◆ invalidate()

bool LazyValueInfo::invalidate ( Function F,
const PreservedAnalyses PA,
FunctionAnalysisManager::Invalidator Inv 
)

Handle invalidation events in the new pass manager.

Definition at line 1688 of file LazyValueInfo.cpp.

References llvm::PreservedAnalyses::getChecker().

◆ operator=()

LazyValueInfo & llvm::LazyValueInfo::operator= ( LazyValueInfo &&  Arg)
inline

Definition at line 52 of file LazyValueInfo.h.

References DL, and releaseMemory().

◆ printLVI()

void LazyValueInfo::printLVI ( Function F,
DominatorTree DTree,
raw_ostream OS 
)

Print the \LazyValueInfo Analysis.

We pass in the DTree that is required for identifying which basic blocks we can solve/print for, in the LVIPrinter.

Definition at line 1995 of file LazyValueInfo.cpp.

References F, and OS.

◆ releaseMemory()

void LazyValueInfo::releaseMemory ( )

◆ threadEdge()

void LazyValueInfo::threadEdge ( BasicBlock PredBB,
BasicBlock OldSucc,
BasicBlock NewSucc 
)

Inform the analysis cache that we have threaded an edge from PredBB to OldSucc to be from PredBB to NewSucc instead.

Definition at line 1974 of file LazyValueInfo.cpp.

Referenced by llvm::JumpThreadingPass::threadEdge().

Friends And Related Function Documentation

◆ LazyValueInfoWrapperPass

friend class LazyValueInfoWrapperPass
friend

Definition at line 33 of file LazyValueInfo.h.


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