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LLVM
4.0.0
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This is an important base class in LLVM. More...
#include <Constant.h>
Public Member Functions | |
| void | operator= (const Constant &)=delete |
| Constant (const Constant &)=delete | |
| bool | isNullValue () const |
| Return true if this is the value that would be returned by getNullValue. More... | |
| bool | isOneValue () const |
| Returns true if the value is one. More... | |
| bool | isAllOnesValue () const |
| Return true if this is the value that would be returned by getAllOnesValue. More... | |
| bool | isNegativeZeroValue () const |
| Return true if the value is what would be returned by getZeroValueForNegation. More... | |
| bool | isZeroValue () const |
| Return true if the value is negative zero or null value. More... | |
| bool | isNotMinSignedValue () const |
| Return true if the value is not the smallest signed value. More... | |
| bool | isMinSignedValue () const |
| Return true if the value is the smallest signed value. More... | |
| bool | canTrap () const |
| Return true if evaluation of this constant could trap. More... | |
| bool | isThreadDependent () const |
| Return true if the value can vary between threads. More... | |
| bool | isDLLImportDependent () const |
| Return true if the value is dependent on a dllimport variable. More... | |
| bool | isConstantUsed () const |
| Return true if the constant has users other than constant expressions and other dangling things. More... | |
| bool | needsRelocation () const |
| This method classifies the entry according to whether or not it may generate a relocation entry. More... | |
| Constant * | getAggregateElement (unsigned Elt) const |
| For aggregates (struct/array/vector) return the constant that corresponds to the specified element if possible, or null if not. More... | |
| Constant * | getAggregateElement (Constant *Elt) const |
| Constant * | getSplatValue () const |
| If this is a splat vector constant, meaning that all of the elements have the same value, return that value. More... | |
| const APInt & | getUniqueInteger () const |
| If C is a constant integer then return its value, otherwise C must be a vector of constant integers, all equal, and the common value is returned. More... | |
| void | destroyConstant () |
| Called if some element of this constant is no longer valid. More... | |
| void | handleOperandChange (Value *, Value *) |
| This method is a special form of User::replaceUsesOfWith (which does not work on constants) that does work on constants. More... | |
| void | removeDeadConstantUsers () const |
| If there are any dead constant users dangling off of this constant, remove them. More... | |
| Constant * | stripPointerCasts () |
| const Constant * | stripPointerCasts () const |
Public Member Functions inherited from llvm::User | |
| User (const User &)=delete | |
| ~User () override=default | |
| void | operator delete (void *Usr) |
| Free memory allocated for User and Use objects. More... | |
| void | operator delete (void *, unsigned) |
| Placement delete - required by std, but never called. More... | |
| void | operator delete (void *, unsigned, bool) |
| Placement delete - required by std, but never called. More... | |
| Use * | getOperandList () |
| const Use * | getOperandList () const |
| Value * | getOperand (unsigned i) const |
| void | setOperand (unsigned i, Value *Val) |
| const Use & | getOperandUse (unsigned i) const |
| Use & | getOperandUse (unsigned i) |
| unsigned | getNumOperands () const |
| ArrayRef< const uint8_t > | getDescriptor () const |
| Returns the descriptor co-allocated with this User instance. More... | |
| MutableArrayRef< uint8_t > | getDescriptor () |
| Returns the descriptor co-allocated with this User instance. More... | |
| void | setGlobalVariableNumOperands (unsigned NumOps) |
| Set the number of operands on a GlobalVariable. More... | |
| void | setNumHungOffUseOperands (unsigned NumOps) |
| Subclasses with hung off uses need to manage the operand count themselves. More... | |
| op_iterator | op_begin () |
| const_op_iterator | op_begin () const |
| op_iterator | op_end () |
| const_op_iterator | op_end () const |
| op_range | operands () |
| const_op_range | operands () const |
| value_op_iterator | value_op_begin () |
| value_op_iterator | value_op_end () |
| iterator_range< value_op_iterator > | operand_values () |
| const_value_op_iterator | value_op_begin () const |
| const_value_op_iterator | value_op_end () const |
| iterator_range < const_value_op_iterator > | operand_values () const |
| void | dropAllReferences () |
| Drop all references to operands. More... | |
| void | replaceUsesOfWith (Value *From, Value *To) |
| Replace uses of one Value with another. More... | |
Public Member Functions inherited from llvm::Value | |
| Value (const Value &)=delete | |
| void | operator= (const Value &)=delete |
| virtual | ~Value () |
| void | dump () const |
| Support for debugging, callable in GDB: V->dump() More... | |
| Type * | getType () const |
| All values are typed, get the type of this value. More... | |
| LLVMContext & | getContext () const |
| All values hold a context through their type. More... | |
| bool | hasName () const |
| ValueName * | getValueName () const |
| void | setValueName (ValueName *VN) |
| StringRef | getName () const |
| Return a constant reference to the value's name. More... | |
| void | setName (const Twine &Name) |
| Change the name of the value. More... | |
| void | takeName (Value *V) |
| Transfer the name from V to this value. More... | |
| void | replaceAllUsesWith (Value *V) |
| Change all uses of this to point to a new Value. More... | |
| void | replaceNonMetadataUsesWith (Value *V) |
| Change non-metadata uses of this to point to a new Value. More... | |
| void | replaceUsesOutsideBlock (Value *V, BasicBlock *BB) |
| replaceUsesOutsideBlock - Go through the uses list for this definition and make each use point to "V" instead of "this" when the use is outside the block. More... | |
| void | assertModuleIsMaterialized () const |
| bool | use_empty () const |
| use_iterator | materialized_use_begin () |
| const_use_iterator | materialized_use_begin () const |
| use_iterator | use_begin () |
| const_use_iterator | use_begin () const |
| use_iterator | use_end () |
| const_use_iterator | use_end () const |
| iterator_range< use_iterator > | materialized_uses () |
| iterator_range < const_use_iterator > | materialized_uses () const |
| iterator_range< use_iterator > | uses () |
| iterator_range < const_use_iterator > | uses () const |
| bool | user_empty () const |
| user_iterator | materialized_user_begin () |
| const_user_iterator | materialized_user_begin () const |
| user_iterator | user_begin () |
| const_user_iterator | user_begin () const |
| user_iterator | user_end () |
| const_user_iterator | user_end () const |
| User * | user_back () |
| const User * | user_back () const |
| iterator_range< user_iterator > | materialized_users () |
| iterator_range < const_user_iterator > | materialized_users () const |
| iterator_range< user_iterator > | users () |
| iterator_range < const_user_iterator > | users () const |
| bool | hasOneUse () const |
| Return true if there is exactly one user of this value. More... | |
| bool | hasNUses (unsigned N) const |
| Return true if this Value has exactly N users. More... | |
| bool | hasNUsesOrMore (unsigned N) const |
| Return true if this value has N users or more. More... | |
| bool | isUsedInBasicBlock (const BasicBlock *BB) const |
| Check if this value is used in the specified basic block. More... | |
| unsigned | getNumUses () const |
| This method computes the number of uses of this Value. More... | |
| void | addUse (Use &U) |
| This method should only be used by the Use class. More... | |
| unsigned | getValueID () const |
| Return an ID for the concrete type of this object. More... | |
| unsigned | getRawSubclassOptionalData () const |
| Return the raw optional flags value contained in this value. More... | |
| void | clearSubclassOptionalData () |
| Clear the optional flags contained in this value. More... | |
| bool | hasSameSubclassOptionalData (const Value *V) const |
| Check the optional flags for equality. More... | |
| bool | hasValueHandle () const |
| Return true if there is a value handle associated with this value. More... | |
| bool | isUsedByMetadata () const |
| Return true if there is metadata referencing this value. More... | |
| bool | isSwiftError () const |
| Return true if this value is a swifterror value. More... | |
| Value * | stripPointerCasts () |
| Strip off pointer casts, all-zero GEPs, and aliases. More... | |
| const Value * | stripPointerCasts () const |
| Value * | stripPointerCastsNoFollowAliases () |
| Strip off pointer casts and all-zero GEPs. More... | |
| const Value * | stripPointerCastsNoFollowAliases () const |
| Value * | stripInBoundsConstantOffsets () |
| Strip off pointer casts and all-constant inbounds GEPs. More... | |
| const Value * | stripInBoundsConstantOffsets () const |
| Value * | stripAndAccumulateInBoundsConstantOffsets (const DataLayout &DL, APInt &Offset) |
| Accumulate offsets from stripInBoundsConstantOffsets(). More... | |
| const Value * | stripAndAccumulateInBoundsConstantOffsets (const DataLayout &DL, APInt &Offset) const |
| Value * | stripInBoundsOffsets () |
| Strip off pointer casts and inbounds GEPs. More... | |
| const Value * | stripInBoundsOffsets () const |
| unsigned | getPointerDereferenceableBytes (const DataLayout &DL, bool &CanBeNull) const |
| Returns the number of bytes known to be dereferenceable for the pointer value. More... | |
| unsigned | getPointerAlignment (const DataLayout &DL) const |
| Returns an alignment of the pointer value. More... | |
| Value * | DoPHITranslation (const BasicBlock *CurBB, const BasicBlock *PredBB) |
| Translate PHI node to its predecessor from the given basic block. More... | |
| const Value * | DoPHITranslation (const BasicBlock *CurBB, const BasicBlock *PredBB) const |
| void | mutateType (Type *Ty) |
| Mutate the type of this Value to be of the specified type. More... | |
| template<class Compare > | |
| void | sortUseList (Compare Cmp) |
| Sort the use-list. More... | |
| void | reverseUseList () |
| Reverse the use-list. More... | |
| void | print (raw_ostream &O, bool IsForDebug=false) const |
| Implement operator<< on Value. More... | |
| void | print (raw_ostream &O, ModuleSlotTracker &MST, bool IsForDebug=false) const |
| void | printAsOperand (raw_ostream &O, bool PrintType=true, const Module *M=nullptr) const |
| Print the name of this Value out to the specified raw_ostream. More... | |
| void | printAsOperand (raw_ostream &O, bool PrintType, ModuleSlotTracker &MST) const |
Static Public Member Functions | |
| static bool | classof (const Value *V) |
| static Constant * | getNullValue (Type *Ty) |
| Constructor to create a '0' constant of arbitrary type. More... | |
| static Constant * | getAllOnesValue (Type *Ty) |
| Get the all ones value. More... | |
| static Constant * | getIntegerValue (Type *Ty, const APInt &V) |
| Return the value for an integer or pointer constant, or a vector thereof, with the given scalar value. More... | |
Static Public Member Functions inherited from llvm::User | |
| static bool | classof (const Value *V) |
Protected Member Functions | |
| Constant (Type *ty, ValueTy vty, Use *Ops, unsigned NumOps) | |
Protected Member Functions inherited from llvm::User | |
| void * | operator new (size_t Size) |
| Allocate a User with an operand pointer co-allocated. More... | |
| void * | operator new (size_t Size, unsigned Us) |
| Allocate a User with the operands co-allocated. More... | |
| void * | operator new (size_t Size, unsigned Us, unsigned DescBytes) |
| Allocate a User with the operands co-allocated. More... | |
| User (Type *ty, unsigned vty, Use *, unsigned NumOps) | |
| void | allocHungoffUses (unsigned N, bool IsPhi=false) |
| Allocate the array of Uses, followed by a pointer (with bottom bit set) to the User. More... | |
| void | growHungoffUses (unsigned N, bool IsPhi=false) |
| Grow the number of hung off uses. More... | |
| template<int Idx> | |
| Use & | Op () |
| template<int Idx> | |
| const Use & | Op () const |
Protected Member Functions inherited from llvm::Value | |
| Value (Type *Ty, unsigned scid) | |
| unsigned short | getSubclassDataFromValue () const |
| void | setValueSubclassData (unsigned short D) |
Additional Inherited Members | |
Public Types inherited from llvm::User | |
| typedef Use * | op_iterator |
| typedef const Use * | const_op_iterator |
| typedef iterator_range < op_iterator > | op_range |
| typedef iterator_range < const_op_iterator > | const_op_range |
Public Types inherited from llvm::Value | |
| enum | ValueTy |
| Concrete subclass of this. More... | |
| typedef use_iterator_impl< Use > | use_iterator |
| typedef use_iterator_impl < const Use > | const_use_iterator |
| typedef user_iterator_impl< User > | user_iterator |
| typedef user_iterator_impl < const User > | const_user_iterator |
Static Public Attributes inherited from llvm::Value | |
| static const unsigned | MaxAlignmentExponent = 29 |
| The maximum alignment for instructions. More... | |
| static const unsigned | MaximumAlignment = 1u << MaxAlignmentExponent |
Protected Types inherited from llvm::Value | |
| enum | : unsigned { NumUserOperandsBits = 28 } |
| The number of operands in the subclass. More... | |
Static Protected Member Functions inherited from llvm::User | |
| template<int Idx, typename U > | |
| static Use & | OpFrom (const U *that) |
Protected Attributes inherited from llvm::Value | |
| unsigned char | SubclassOptionalData: 7 |
| Hold subclass data that can be dropped. More... | |
| unsigned | NumUserOperands: NumUserOperandsBits |
| unsigned | IsUsedByMD: 1 |
| unsigned | HasName: 1 |
| unsigned | HasHungOffUses: 1 |
| unsigned | HasDescriptor: 1 |
This is an important base class in LLVM.
It provides the common facilities of all constant values in an LLVM program. A constant is a value that is immutable at runtime. Functions are constants because their address is immutable. Same with global variables.
All constants share the capabilities provided in this class. All constants can have a null value. They can have an operand list. Constants can be simple (integer and floating point values), complex (arrays and structures), or expression based (computations yielding a constant value composed of only certain operators and other constant values).
Note that Constants are immutable (once created they never change) and are fully shared by structural equivalence. This means that two structurally equivalent constants will always have the same address. Constants are created on demand as needed and never deleted: thus clients don't have to worry about the lifetime of the objects. LLVM Constant Representation
Definition at line 42 of file Constant.h.
Definition at line 46 of file Constant.h.
| bool Constant::canTrap | ( | ) | const |
Return true if evaluation of this constant could trap.
This is true for things like constant expressions that could divide by zero.
Definition at line 359 of file Constants.cpp.
References canTrapImpl().
Referenced by SplitCriticalSideEffectEdges().
Definition at line 121 of file Constant.h.
References llvm::Value::getValueID().
| void Constant::destroyConstant | ( | ) |
Called if some element of this constant is no longer valid.
At this point only other constants may be on the use_list for this constant. Any constants on our Use list must also be destroy'd. The implementation must be sure to remove the constant from the list of available cached constants. Implementations should implement destroyConstantImpl to remove constants from any pools/maps they are contained it.
First call destroyConstantImpl on the subclass. This gives the subclass a chance to remove the constant from any maps/pools it's contained in.
Definition at line 288 of file Constants.cpp.
References assert(), llvm::dbgs(), llvm::Value::getValueID(), llvm_unreachable, llvm::Value::use_empty(), and llvm::Value::user_back().
Referenced by eliminateAvailableExternally(), handleOperandChange(), llvm::MergeBasicBlockIntoOnlyPred(), RemoveDeadConstant(), replaceConstantExprOp(), llvm::BitcodeReaderValueList::resolveConstantForwardRefs(), llvm::GlobalDCEPass::run(), and llvm::BasicBlock::~BasicBlock().
For aggregates (struct/array/vector) return the constant that corresponds to the specified element if possible, or null if not.
This can return null if the element index is a ConstantExpr, or if 'this' is a constant expr.
Definition at line 265 of file Constants.cpp.
Referenced by areInverseVectorBitmasks(), canonicalizeCmpWithConstant(), computeKnownBits(), llvm::ConstantFoldExtractElementInstruction(), llvm::ConstantFoldExtractValueInstruction(), llvm::ConstantFoldInsertValueInstruction(), llvm::ConstantFoldLoadThroughGEPConstantExpr(), llvm::ConstantFoldLoadThroughGEPIndices(), EvaluateStoreInto(), llvm::extractConstantMask(), llvm::findScalarElement(), foldConstantInsEltIntoShuffle(), getAggregateElement(), getArrayElements(), llvm::ShuffleVectorInst::getMaskValue(), llvm::ShuffleVectorInst::getShuffleMask(), getTargetConstantBitsFromNode(), getUniqueInteger(), isFiniteNonZeroFp(), llvm::IsFreeToInvert(), isNormalFp(), isUndefShift(), isZero(), scalarConstantToHexString(), simplifyX86extrq(), simplifyX86insertq(), simplifyX86pshufb(), simplifyX86vpermilvar(), simplifyX86vpermv(), llvm::InstCombiner::visitSRem(), and WriteConstantInternal().
Definition at line 281 of file Constants.cpp.
References assert(), getAggregateElement(), and llvm::Value::getType().
Get the all ones value.
Definition at line 249 of file Constants.cpp.
References llvm::ConstantInt::get(), llvm::ConstantFP::get(), llvm::APInt::getAllOnesValue(), llvm::APFloat::getAllOnesValue(), llvm::Type::getContext(), llvm::SequentialType::getElementType(), llvm::SequentialType::getNumElements(), llvm::Type::getPrimitiveSizeInBits(), llvm::ConstantVector::getSplat(), llvm::Type::isFloatingPointTy(), and llvm::Type::isPPC_FP128Ty().
Referenced by BitCastConstantVector(), llvm::ConstantFoldBinaryInstruction(), llvm::ConstantFoldCompareInstruction(), llvm::IRBuilderBase::CreateMaskedGather(), llvm::IRBuilderBase::CreateMaskedScatter(), llvm::BinaryOperator::CreateNot(), DoInitialMatch(), foldLogOpOfMaskedICmpsHelper(), llvm::X86InstrInfo::foldMemoryOperandImpl(), llvm::ConstantExpr::getBinOpAbsorber(), llvm::ConstantExpr::getBinOpIdentity(), llvm::ScalarEvolution::getNegativeSCEV(), llvm::ConstantExpr::getNot(), llvm::ScalarEvolution::getNotSCEV(), getSelectFoldableConstant(), getTrue(), LLVMConstAllOnes(), LowerNegateToMultiply(), OptimizeAndOrXor(), SimplifyAddInst(), SimplifyOrInst(), SimplifyXorInst(), ThreadCmpOverSelect(), llvm::InstCombiner::visitICmpInst(), and llvm::InstCombiner::visitURem().
Return the value for an integer or pointer constant, or a vector thereof, with the given scalar value.
Definition at line 232 of file Constants.cpp.
References C, llvm::ConstantInt::get(), llvm::Type::getContext(), llvm::ConstantExpr::getIntToPtr(), llvm::Type::getScalarType(), and llvm::ConstantVector::getSplat().
Referenced by createIRLevelProfileFlagVariable(), getConstantVector(), LowerVectorBroadcast(), simplifyX86extrq(), simplifyX86insertq(), simplifyX86movmsk(), llvm::InstCombiner::visitAdd(), and llvm::InstCombiner::visitReturnInst().
Constructor to create a '0' constant of arbitrary type.
Definition at line 195 of file Constants.cpp.
References llvm::lltok::APFloat, llvm::Type::ArrayTyID, llvm::Type::DoubleTyID, llvm::Type::FloatTyID, llvm::Type::FP128TyID, llvm::ConstantInt::get(), llvm::ConstantFP::get(), llvm::ConstantAggregateZero::get(), llvm::ConstantPointerNull::get(), llvm::ConstantTokenNone::get(), llvm::Type::getContext(), llvm::APInt::getNullValue(), llvm::Type::getTypeID(), llvm::APFloat::getZero(), llvm::Type::HalfTyID, llvm::APFloatBase::IEEEdouble(), llvm::APFloatBase::IEEEhalf(), llvm::APFloatBase::IEEEquad(), llvm::APFloatBase::IEEEsingle(), llvm::Type::IntegerTyID, llvm_unreachable, llvm::Type::PointerTyID, llvm::Type::PPC_FP128TyID, llvm::APFloatBase::PPCDoubleDouble(), llvm::Type::StructTyID, llvm::Type::TokenTyID, llvm::Type::VectorTyID, llvm::Type::X86_FP80TyID, and llvm::APFloatBase::x87DoubleExtended().
Referenced by appendToGlobalArray(), BitCastConstantVector(), BreakUpSubtract(), CleanupConstantGlobalUsers(), llvm::ConstantFoldBinaryInstruction(), llvm::ConstantFoldCastInstruction(), llvm::ConstantFoldCompareInstOperands(), llvm::ConstantFoldCompareInstruction(), llvm::ConstantFoldExtractElementInstruction(), llvm::ConstantFoldGetElementPtr(), llvm::ConstantFoldLoadFromConstPtr(), ConvertImplicitDefToConstZero(), llvm::SanitizerStatReport::create(), llvm::IRBuilder< TargetFolder >::CreateIsNotNull(), llvm::IRBuilder< TargetFolder >::CreateIsNull(), llvm::decomposeBitTestICmp(), despeculateCountZeros(), eliminateUnreachableBlock(), llvm::EmitGEPOffset(), evaluateICmpRelation(), llvm::SCEVExpander::expandUnionPredicate(), ExtractConstantBytes(), llvm::SanitizerStatReport::finish(), FoldBitCast(), foldBoolSextMaskToSelect(), foldLogOpOfMaskedICmps(), llvm::X86InstrInfo::foldMemoryOperandImpl(), foldUDivNegCst(), llvm::ConstantExpr::getAlignOf(), getAsConstantIndexedAddress(), llvm::ConstantExpr::getBinOpAbsorber(), llvm::ConstantExpr::getBinOpIdentity(), getFalse(), getFoldedSizeOf(), llvm::ConstantExpr::getOffsetOf(), getSelectFoldableConstant(), llvm::ConstantAggregateZero::getSequentialElement(), GetShiftedValue(), llvm::ConstantExpr::getSizeOf(), getSplatValue(), llvm::ConstantAggregateZero::getStructElement(), llvm::ConstantFP::getZeroValueForNegation(), llvm::isBytewiseValue(), LLVMConstNull(), llvm::NVPTXTargetLowering::LowerFormalArguments(), llvm::IntrinsicLowering::LowerIntrinsicCall(), LowerNegateToMultiply(), LowerToTLSExecModel(), OptimizeAndOrXor(), OptimizeEmptyGlobalCXXDtors(), optimizeIntegerToVectorInsertions(), optimizeVectorResize(), PerformHeapAllocSRoA(), rewriteGEPAsOffset(), RewriteHeapSROALoadUser(), simplifyAllocaArraySize(), SimplifyAndInst(), SimplifyDiv(), SimplifyFAddInst(), SimplifyFSubInst(), SimplifyGEPInst(), SimplifyICmpInst(), simplifyICmpWithBinOp(), SimplifyIntrinsic(), SimplifyMulInst(), SimplifyRem(), SimplifyRightShift(), SimplifyShlInst(), SimplifySubInst(), SimplifyUDivInst(), simplifyX86MaskedLoad(), simplifyX86movmsk(), simplifyX86pshufb(), simplifyX86varShift(), SimplifyXorInst(), SRAGlobal(), llvm::UpgradeIntrinsicCall(), upgradeMaskedCompare(), UpgradeX86ALIGNIntrinsics(), UpgradeX86PSLLDQIntrinsics(), UpgradeX86PSRLDQIntrinsics(), llvm::InstCombiner::visitAnd(), llvm::InstCombiner::visitBitCast(), llvm::InstCombiner::visitFCmpInst(), llvm::InstCombiner::visitGetElementPtrInst(), llvm::InstCombiner::visitICmpInst(), llvm::InstCombiner::visitLandingPadInst(), llvm::InstCombiner::visitLoadInst(), llvm::InstCombiner::visitMul(), llvm::InstCombiner::visitTrunc(), and llvm::Evaluator::~Evaluator().
| Constant * Constant::getSplatValue | ( | ) | const |
If this is a splat vector constant, meaning that all of the elements have the same value, return that value.
Otherwise return 0.
Definition at line 1290 of file Constants.cpp.
References assert(), getNullValue(), and llvm::Value::getType().
Referenced by computeKnownBitsFromOperator(), getUniqueInteger(), llvm::CompositeType::indexValid(), isAllOnesValue(), isMinSignedValue(), isNotMinSignedValue(), and isOneValue().
If C is a constant integer then return its value, otherwise C must be a vector of constant integers, all equal, and the common value is returned.
Definition at line 1311 of file Constants.cpp.
References assert(), C, getAggregateElement(), and getSplatValue().
This method is a special form of User::replaceUsesOfWith (which does not work on constants) that does work on constants.
Update this constant array to change uses of 'From' to be uses of 'To'.
Basically this method goes through the trouble of building a new constant that is equivalent to the current one, with all uses of From replaced with uses of To. After this construction is completed, all of the users of 'this' are replaced to use the new constant, and then 'this' is deleted. In general, you should not call this method, instead, use Value::replaceAllUsesWith, which automatically dispatches to this method as needed.
This must update the uniquing data structures etc.
Note that we intentionally replace all uses of From with To here. Consider a large array that uses 'From' 1000 times. By handling this case all here, ConstantArray::handleOperandChange is only invoked once, and that single invocation handles all 1000 uses. Handling them one at a time would work, but would be really slow because it would have to unique each updated array instance.
Definition at line 2693 of file Constants.cpp.
References assert(), destroyConstant(), llvm::Value::getValueID(), llvm_unreachable, and llvm::Value::replaceAllUsesWith().
| bool Constant::isAllOnesValue | ( | ) | const |
Return true if this is the value that would be returned by getAllOnesValue.
Definition at line 105 of file Constants.cpp.
References getSplatValue().
Referenced by BitCastConstantVector(), ConstantFold(), llvm::ConstantFoldSelectInstruction(), llvm::decomposeBitTestICmp(), llvm::Evaluator::EvaluateBlock(), and isSelect01().
| bool Constant::isConstantUsed | ( | ) | const |
Return true if the constant has users other than constant expressions and other dangling things.
Definition at line 403 of file Constants.cpp.
References llvm::dyn_cast(), isConstantUsed(), and llvm::Value::users().
Referenced by findPartitions(), and isConstantUsed().
| bool Constant::isDLLImportDependent | ( | ) | const |
Return true if the value is dependent on a dllimport variable.
Definition at line 396 of file Constants.cpp.
References ConstHasGlobalValuePredicate().
Referenced by ValidLookupTableConstant().
| bool Constant::isMinSignedValue | ( | ) | const |
Return true if the value is the smallest signed value.
Definition at line 149 of file Constants.cpp.
References getSplatValue().
| bool Constant::isNegativeZeroValue | ( | ) | const |
Return true if the value is what would be returned by getZeroValueForNegation.
Definition at line 44 of file Constants.cpp.
References llvm::Value::getType(), llvm::Type::isFPOrFPVectorTy(), and isNullValue().
Referenced by llvm::InstCombiner::visitFAdd().
| bool Constant::isNotMinSignedValue | ( | ) | const |
Return true if the value is not the smallest signed value.
Definition at line 171 of file Constants.cpp.
References getSplatValue().
Referenced by llvm::InstCombiner::visitMul(), and llvm::InstCombiner::visitSub().
| bool Constant::isNullValue | ( | ) | const |
Return true if this is the value that would be returned by getNullValue.
Definition at line 90 of file Constants.cpp.
Referenced by addTryBlockMapEntry(), BitCastConstantVector(), calculateSEHStateNumbers(), llvm::FunctionComparator::cmpConstants(), collectInsertionElements(), computePointerICmp(), ConstantFold(), llvm::ConstantFoldCastInstruction(), llvm::ConstantFoldCompareInstOperands(), llvm::ConstantFoldCompareInstruction(), llvm::ConstantFoldExtractElementInstruction(), llvm::ConstantFoldGetElementPtr(), llvm::ConstantFoldSelectInstruction(), eliminateNoopStore(), evaluateICmpRelation(), ExtractConstantBytes(), llvm::InstCombiner::FoldAndOfICmps(), llvm::ConstantStruct::get(), llvm::getConstantStringInfo(), llvm::LazyValueInfo::getPredicateAt(), getPredicateResult(), isCatchAll(), isKnownNonZero(), isNegativeZeroValue(), isSuitableForBSS(), isZeroValue(), llvm::AsmPrinter::lowerConstant(), optimizeOnceStoredGlobal(), passingValueIsAlwaysUndefined(), llvm::ExecutionEngine::runStaticConstructorsDestructors(), TryToShrinkGlobalToBoolean(), TurnSwitchRangeIntoICmp(), and llvm::InstCombiner::visitFCmpInst().
| bool Constant::isOneValue | ( | ) | const |
Returns true if the value is one.
Definition at line 127 of file Constants.cpp.
References getSplatValue().
Referenced by llvm::InstCombiner::visitSub().
| bool Constant::isThreadDependent | ( | ) | const |
Return true if the value can vary between threads.
Definition at line 389 of file Constants.cpp.
References ConstHasGlobalValuePredicate().
Referenced by ValidLookupTableConstant().
| bool Constant::isZeroValue | ( | ) | const |
Return true if the value is negative zero or null value.
Definition at line 70 of file Constants.cpp.
References isNullValue().
Referenced by computeKnownBitsFromOperator(), isZero(), and shouldConvertImpl().
| bool Constant::needsRelocation | ( | ) | const |
This method classifies the entry according to whether or not it may generate a relocation entry.
This must be conservative, so if it might codegen to a relocatable entry, it should say so.
FIXME: This really should not be in IR.
Definition at line 415 of file Constants.cpp.
References llvm::dyn_cast(), llvm::User::getNumOperands(), llvm::ConstantExpr::getOpcode(), llvm::User::getOperand(), and i.
Referenced by llvm::TargetLoweringObjectFile::getKindForGlobal(), and llvm::ARMTTIImpl::shouldBuildLookupTablesForConstant().
| void Constant::removeDeadConstantUsers | ( | ) | const |
If there are any dead constant users dangling off of this constant, remove them.
This method is useful for clients that want to check to see if a global is unused, but don't want to deal with potentially dead constants hanging off of the globals.
Definition at line 463 of file Constants.cpp.
References llvm::dyn_cast(), E, I, removeDeadUsersOfConstant(), llvm::Value::user_begin(), and llvm::Value::user_end().
Referenced by AddressIsTaken(), deleteIfDead(), hasAddressTakenAndUsed(), mergeConstants(), OptimizeGlobalAliases(), llvm::LegacyInlinerBase::removeDeadFunctions(), llvm::AlwaysInlinerPass::run(), and llvm::GlobalValue::~GlobalValue().
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inline |
Definition at line 155 of file Constant.h.
References llvm::Value::stripPointerCasts().
Referenced by llvm::addLandingPadInfo(), addTryBlockMapEntry(), llvm::WinException::beginFunclet(), llvm::DwarfCFIException::beginFunction(), llvm::WinException::beginFunction(), llvm::emitFPutC(), llvm::emitFPutS(), llvm::emitFWrite(), llvm::emitStrChr(), llvm::emitStrLen(), llvm::ARMAsmPrinter::EmitXXStructor(), llvm::WinException::endFunclet(), llvm::ARMException::endFunction(), llvm::WinException::endFunction(), hasUsesToReplace(), llvm::InlineFunction(), OptimizeGlobalAliases(), stripPointerCasts(), and llvm::InstCombiner::visitLandingPadInst().
Definition at line 159 of file Constant.h.
References stripPointerCasts().
1.8.6