LLVM  6.0.0svn
Public Member Functions | Static Public Member Functions | List of all members
llvm::ConstantRange Class Reference

This class represents a range of values. More...

#include "llvm/IR/ConstantRange.h"

Public Member Functions

 ConstantRange (uint32_t BitWidth, bool isFullSet=true)
 Initialize a full (the default) or empty set for the specified bit width. More...
 
 ConstantRange (APInt Value)
 Initialize a range to hold the single specified value. More...
 
 ConstantRange (APInt Lower, APInt Upper)
 Initialize a range of values explicitly. More...
 
bool getEquivalentICmp (CmpInst::Predicate &Pred, APInt &RHS) const
 Set up Pred and RHS such that ConstantRange::makeExactICmpRegion(Pred, RHS) == *this. More...
 
const APIntgetLower () const
 Return the lower value for this range. More...
 
const APIntgetUpper () const
 Return the upper value for this range. More...
 
uint32_t getBitWidth () const
 Get the bit width of this ConstantRange. More...
 
bool isFullSet () const
 Return true if this set contains all of the elements possible for this data-type. More...
 
bool isEmptySet () const
 Return true if this set contains no members. More...
 
bool isWrappedSet () const
 Return true if this set wraps around the top of the range. More...
 
bool isSignWrappedSet () const
 Return true if this set wraps around the INT_MIN of its bitwidth. More...
 
bool contains (const APInt &Val) const
 Return true if the specified value is in the set. More...
 
bool contains (const ConstantRange &CR) const
 Return true if the other range is a subset of this one. More...
 
const APIntgetSingleElement () const
 If this set contains a single element, return it, otherwise return null. More...
 
const APIntgetSingleMissingElement () const
 If this set contains all but a single element, return it, otherwise return null. More...
 
bool isSingleElement () const
 Return true if this set contains exactly one member. More...
 
APInt getSetSize () const
 Return the number of elements in this set. More...
 
bool isSizeStrictlySmallerThan (const ConstantRange &CR) const
 Compare set size of this range with the range CR. More...
 
bool isSizeLargerThan (uint64_t MaxSize) const
 
APInt getUnsignedMax () const
 Return the largest unsigned value contained in the ConstantRange. More...
 
APInt getUnsignedMin () const
 Return the smallest unsigned value contained in the ConstantRange. More...
 
APInt getSignedMax () const
 Return the largest signed value contained in the ConstantRange. More...
 
APInt getSignedMin () const
 Return the smallest signed value contained in the ConstantRange. More...
 
bool operator== (const ConstantRange &CR) const
 Return true if this range is equal to another range. More...
 
bool operator!= (const ConstantRange &CR) const
 
ConstantRange subtract (const APInt &CI) const
 Subtract the specified constant from the endpoints of this constant range. More...
 
ConstantRange difference (const ConstantRange &CR) const
 Subtract the specified range from this range (aka relative complement of the sets). More...
 
ConstantRange intersectWith (const ConstantRange &CR) const
 Return the range that results from the intersection of this range with another range. More...
 
ConstantRange unionWith (const ConstantRange &CR) const
 Return the range that results from the union of this range with another range. More...
 
ConstantRange castOp (Instruction::CastOps CastOp, uint32_t BitWidth) const
 Return a new range representing the possible values resulting from an application of the specified cast operator to this range. More...
 
ConstantRange zeroExtend (uint32_t BitWidth) const
 Return a new range in the specified integer type, which must be strictly larger than the current type. More...
 
ConstantRange signExtend (uint32_t BitWidth) const
 Return a new range in the specified integer type, which must be strictly larger than the current type. More...
 
ConstantRange truncate (uint32_t BitWidth) const
 Return a new range in the specified integer type, which must be strictly smaller than the current type. More...
 
ConstantRange zextOrTrunc (uint32_t BitWidth) const
 Make this range have the bit width given by BitWidth. More...
 
ConstantRange sextOrTrunc (uint32_t BitWidth) const
 Make this range have the bit width given by BitWidth. More...
 
ConstantRange binaryOp (Instruction::BinaryOps BinOp, const ConstantRange &Other) const
 Return a new range representing the possible values resulting from an application of the specified binary operator to an left hand side of this range and a right hand side of Other. More...
 
ConstantRange add (const ConstantRange &Other) const
 Return a new range representing the possible values resulting from an addition of a value in this range and a value in Other. More...
 
ConstantRange addWithNoSignedWrap (const APInt &Other) const
 Return a new range representing the possible values resulting from a known NSW addition of a value in this range and Other constant. More...
 
ConstantRange sub (const ConstantRange &Other) const
 Return a new range representing the possible values resulting from a subtraction of a value in this range and a value in Other. More...
 
ConstantRange multiply (const ConstantRange &Other) const
 Return a new range representing the possible values resulting from a multiplication of a value in this range and a value in Other, treating both this and Other as unsigned ranges. More...
 
ConstantRange smax (const ConstantRange &Other) const
 Return a new range representing the possible values resulting from a signed maximum of a value in this range and a value in Other. More...
 
ConstantRange umax (const ConstantRange &Other) const
 Return a new range representing the possible values resulting from an unsigned maximum of a value in this range and a value in Other. More...
 
ConstantRange smin (const ConstantRange &Other) const
 Return a new range representing the possible values resulting from a signed minimum of a value in this range and a value in Other. More...
 
ConstantRange umin (const ConstantRange &Other) const
 Return a new range representing the possible values resulting from an unsigned minimum of a value in this range and a value in Other. More...
 
ConstantRange udiv (const ConstantRange &Other) const
 Return a new range representing the possible values resulting from an unsigned division of a value in this range and a value in Other. More...
 
ConstantRange binaryAnd (const ConstantRange &Other) const
 Return a new range representing the possible values resulting from a binary-and of a value in this range by a value in Other. More...
 
ConstantRange binaryOr (const ConstantRange &Other) const
 Return a new range representing the possible values resulting from a binary-or of a value in this range by a value in Other. More...
 
ConstantRange shl (const ConstantRange &Other) const
 Return a new range representing the possible values resulting from a left shift of a value in this range by a value in Other. More...
 
ConstantRange lshr (const ConstantRange &Other) const
 Return a new range representing the possible values resulting from a logical right shift of a value in this range and a value in Other. More...
 
ConstantRange inverse () const
 Return a new range that is the logical not of the current set. More...
 
void print (raw_ostream &OS) const
 Print out the bounds to a stream. More...
 
void dump () const
 Allow printing from a debugger easily. More...
 

Static Public Member Functions

static ConstantRange makeAllowedICmpRegion (CmpInst::Predicate Pred, const ConstantRange &Other)
 Produce the smallest range such that all values that may satisfy the given predicate with any value contained within Other is contained in the returned range. More...
 
static ConstantRange makeSatisfyingICmpRegion (CmpInst::Predicate Pred, const ConstantRange &Other)
 Produce the largest range such that all values in the returned range satisfy the given predicate with all values contained within Other. More...
 
static ConstantRange makeExactICmpRegion (CmpInst::Predicate Pred, const APInt &Other)
 Produce the exact range such that all values in the returned range satisfy the given predicate with any value contained within Other. More...
 
static ConstantRange makeGuaranteedNoWrapRegion (Instruction::BinaryOps BinOp, const ConstantRange &Other, unsigned NoWrapKind)
 Return the largest range containing all X such that "X BinOpC Y" is guaranteed not to wrap (overflow) for all Y in Other. More...
 

Detailed Description

This class represents a range of values.

Definition at line 47 of file ConstantRange.h.

Constructor & Destructor Documentation

◆ ConstantRange() [1/3]

ConstantRange::ConstantRange ( uint32_t  BitWidth,
bool  isFullSet = true 
)
explicit

◆ ConstantRange() [2/3]

ConstantRange::ConstantRange ( APInt  Value)

Initialize a range to hold the single specified value.

Definition at line 45 of file ConstantRange.cpp.

◆ ConstantRange() [3/3]

ConstantRange::ConstantRange ( APInt  Lower,
APInt  Upper 
)

Initialize a range of values explicitly.

This will assert out if Lower==Upper and Lower != Min or Max value for its type. It will also assert out if the two APInt's are not the same bit width.

Definition at line 48 of file ConstantRange.cpp.

References assert(), llvm::APInt::getBitWidth(), llvm::APInt::isMaxValue(), and llvm::APInt::isMinValue().

Member Function Documentation

◆ add()

ConstantRange ConstantRange::add ( const ConstantRange Other) const

Return a new range representing the possible values resulting from an addition of a value in this range and a value in Other.

Definition at line 678 of file ConstantRange.cpp.

References ConstantRange(), getBitWidth(), getLower(), getUpper(), isEmptySet(), isFullSet(), isSizeStrictlySmallerThan(), and X.

Referenced by binaryOp(), llvm::JumpThreadingPass::ComputeValueKnownInPredecessors(), GetRangeFromMetadata(), and IsKnownPredicateViaMinOrMax().

◆ addWithNoSignedWrap()

ConstantRange ConstantRange::addWithNoSignedWrap ( const APInt Other) const

Return a new range representing the possible values resulting from a known NSW addition of a value in this range and Other constant.

Definition at line 697 of file ConstantRange.cpp.

References llvm::MCID::Add, ConstantRange(), intersectWith(), makeGuaranteedNoWrapRegion(), and llvm::OverflowingBinaryOperator::NoSignedWrap.

◆ binaryAnd()

ConstantRange ConstantRange::binaryAnd ( const ConstantRange Other) const

Return a new range representing the possible values resulting from a binary-and of a value in this range by a value in Other.

Definition at line 866 of file ConstantRange.cpp.

References ConstantRange(), getBitWidth(), llvm::APInt::getNullValue(), getUnsignedMax(), llvm::APInt::isAllOnesValue(), isEmptySet(), umin(), and llvm::APIntOps::umin().

Referenced by binaryOp().

◆ binaryOp()

ConstantRange ConstantRange::binaryOp ( Instruction::BinaryOps  BinOp,
const ConstantRange Other 
) const

Return a new range representing the possible values resulting from an application of the specified binary operator to an left hand side of this range and a right hand side of Other.

Definition at line 641 of file ConstantRange.cpp.

References llvm::MCID::Add, add(), assert(), binaryAnd(), binaryOr(), ConstantRange(), getBitWidth(), lshr(), multiply(), shl(), sub(), and udiv().

Referenced by isObjectDereferencedInBlock().

◆ binaryOr()

ConstantRange ConstantRange::binaryOr ( const ConstantRange Other) const

Return a new range representing the possible values resulting from a binary-or of a value in this range by a value in Other.

Definition at line 879 of file ConstantRange.cpp.

References ConstantRange(), getBitWidth(), llvm::APInt::getNullValue(), getUnsignedMin(), isEmptySet(), llvm::APInt::isNullValue(), umax(), and llvm::APIntOps::umax().

Referenced by binaryOp().

◆ castOp()

ConstantRange ConstantRange::castOp ( Instruction::CastOps  CastOp,
uint32_t  BitWidth 
) const

Return a new range representing the possible values resulting from an application of the specified cast operator to this range.

BitWidth is the target bitwidth of the cast. For casts which don't change bitwidth, it must be the same as the source bitwidth. For casts which do change bitwidth, the bitwidth must be consistent with the requested cast and source bitwidth.

Definition at line 491 of file ConstantRange.cpp.

References ConstantRange(), getBitWidth(), llvm::APInt::getMaxValue(), llvm::APInt::getMinValue(), llvm::APInt::getSignedMaxValue(), llvm::APInt::getSignedMinValue(), llvm_unreachable, fuzzer::Max(), fuzzer::Min(), llvm::APInt::sextOrSelf(), signExtend(), truncate(), zeroExtend(), and llvm::APInt::zextOrSelf().

Referenced by isObjectDereferencedInBlock().

◆ contains() [1/2]

bool ConstantRange::contains ( const APInt Val) const

◆ contains() [2/2]

bool ConstantRange::contains ( const ConstantRange CR) const

Return true if the other range is a subset of this one.

Definition at line 316 of file ConstantRange.cpp.

References getLower(), getUpper(), isEmptySet(), isFullSet(), isWrappedSet(), and llvm::APInt::ule().

◆ difference()

ConstantRange ConstantRange::difference ( const ConstantRange CR) const

Subtract the specified range from this range (aka relative complement of the sets).

Definition at line 342 of file ConstantRange.cpp.

References intersectWith(), and inverse().

Referenced by getEdgeValueLocal(), isImpliedCondMatchingImmOperands(), and processUGT_ADDCST_ADD().

◆ dump()

LLVM_DUMP_METHOD void ConstantRange::dump ( ) const

Allow printing from a debugger easily.

Definition at line 943 of file ConstantRange.cpp.

References llvm::dbgs(), and print().

◆ getBitWidth()

uint32_t llvm::ConstantRange::getBitWidth ( ) const
inline

◆ getEquivalentICmp()

bool ConstantRange::getEquivalentICmp ( CmpInst::Predicate Pred,
APInt RHS 
) const

◆ getLower()

const APInt& llvm::ConstantRange::getLower ( ) const
inline

◆ getSetSize()

APInt ConstantRange::getSetSize ( ) const

Return the number of elements in this set.

Definition at line 254 of file ConstantRange.cpp.

References getBitWidth(), llvm::APInt::getOneBitSet(), and isFullSet().

◆ getSignedMax()

APInt ConstantRange::getSignedMax ( ) const

◆ getSignedMin()

APInt ConstantRange::getSignedMin ( ) const

◆ getSingleElement()

const APInt* llvm::ConstantRange::getSingleElement ( ) const
inline

If this set contains a single element, return it, otherwise return null.

Definition at line 152 of file ConstantRange.h.

References llvm::Lower.

Referenced by llvm::LazyValueInfo::getConstant(), llvm::LazyValueInfo::getConstantOnEdge(), getEquivalentICmp(), makeGuaranteedNoWrapRegion(), and processUGT_ADDCST_ADD().

◆ getSingleMissingElement()

const APInt* llvm::ConstantRange::getSingleMissingElement ( ) const
inline

If this set contains all but a single element, return it, otherwise return null.

Definition at line 160 of file ConstantRange.h.

References llvm::Upper.

Referenced by getEquivalentICmp().

◆ getUnsignedMax()

APInt ConstantRange::getUnsignedMax ( ) const

◆ getUnsignedMin()

APInt ConstantRange::getUnsignedMin ( ) const

◆ getUpper()

const APInt& llvm::ConstantRange::getUpper ( ) const
inline

◆ intersectWith()

ConstantRange ConstantRange::intersectWith ( const ConstantRange CR) const

Return the range that results from the intersection of this range with another range.

The resultant range is guaranteed to include all elements contained in both input ranges, and to have the smallest possible set size that does so. Because there may be two intersections with the same set size, A.intersectWith(B) might not be equal to B.intersectWith(A).

Definition at line 346 of file ConstantRange.cpp.

References assert(), ConstantRange(), getBitWidth(), intersectWith(), isEmptySet(), isFullSet(), isSizeStrictlySmallerThan(), isWrappedSet(), llvm::APInt::ule(), and llvm::APInt::ult().

Referenced by addWithNoSignedWrap(), canBeMerged(), difference(), intersectWith(), isContiguous(), isImpliedCondMatchingImmOperands(), processUGT_ADDCST_ADD(), simplifyICmpWithConstant(), and visitIVCast().

◆ inverse()

ConstantRange ConstantRange::inverse ( ) const

◆ isEmptySet()

bool ConstantRange::isEmptySet ( ) const

◆ isFullSet()

bool ConstantRange::isFullSet ( ) const

◆ isSignWrappedSet()

bool ConstantRange::isSignWrappedSet ( ) const

Return true if this set wraps around the INT_MIN of its bitwidth.

For example: i8 [120, 140).

Definition at line 249 of file ConstantRange.cpp.

References contains(), getBitWidth(), llvm::APInt::getSignedMaxValue(), and llvm::APInt::getSignedMinValue().

Referenced by mapBinOpcode(), and signExtend().

◆ isSingleElement()

bool llvm::ConstantRange::isSingleElement ( ) const
inline

Return true if this set contains exactly one member.

Definition at line 167 of file ConstantRange.h.

Referenced by getPredicateResult(), and makeAllowedICmpRegion().

◆ isSizeLargerThan()

bool ConstantRange::isSizeLargerThan ( uint64_t  MaxSize) const

◆ isSizeStrictlySmallerThan()

bool ConstantRange::isSizeStrictlySmallerThan ( const ConstantRange CR) const

Compare set size of this range with the range CR.

Definition at line 263 of file ConstantRange.cpp.

References assert(), getBitWidth(), and isFullSet().

Referenced by add(), intersectWith(), multiply(), and sub().

◆ isWrappedSet()

bool ConstantRange::isWrappedSet ( ) const

Return true if this set wraps around the top of the range.

For example: [100, 8).

Definition at line 245 of file ConstantRange.cpp.

References llvm::APInt::ugt().

Referenced by contains(), getUnsignedMax(), getUnsignedMin(), intersectWith(), llvm::SelectionDAGBuilder::lowerRangeToAssertZExt(), multiply(), truncate(), unionWith(), and zeroExtend().

◆ lshr()

ConstantRange ConstantRange::lshr ( const ConstantRange Other) const

Return a new range representing the possible values resulting from a logical right shift of a value in this range and a value in Other.

Definition at line 913 of file ConstantRange.cpp.

References ConstantRange(), getBitWidth(), getUnsignedMax(), getUnsignedMin(), isEmptySet(), llvm::APInt::lshr(), and llvm::max().

Referenced by binaryOp().

◆ makeAllowedICmpRegion()

ConstantRange ConstantRange::makeAllowedICmpRegion ( CmpInst::Predicate  Pred,
const ConstantRange Other 
)
static

Produce the smallest range such that all values that may satisfy the given predicate with any value contained within Other is contained in the returned range.

Formally, this returns a superset of 'union over all y in Other . { x : icmp op x y is true }'. If the exact answer is not representable as a ConstantRange, the return value will be a proper superset of the above.

Example: Pred = ult and Other = i8 [2, 5) returns Result = [0, 4)

Definition at line 56 of file ConstantRange.cpp.

References ConstantRange(), getBitWidth(), getLower(), llvm::APInt::getMinValue(), llvm::APInt::getNullValue(), getSignedMax(), getSignedMin(), llvm::APInt::getSignedMinValue(), getUnsignedMax(), getUnsignedMin(), getUpper(), llvm::CmpInst::ICMP_EQ, llvm::CmpInst::ICMP_NE, llvm::CmpInst::ICMP_SGE, llvm::CmpInst::ICMP_SGT, llvm::CmpInst::ICMP_SLE, llvm::CmpInst::ICMP_SLT, llvm::CmpInst::ICMP_UGE, llvm::CmpInst::ICMP_UGT, llvm::CmpInst::ICMP_ULE, llvm::CmpInst::ICMP_ULT, isEmptySet(), isSingleElement(), and llvm_unreachable.

Referenced by GetConstantInt(), getValueFromICmpCondition(), isImpliedCondMatchingImmOperands(), IsKnownPredicateViaMinOrMax(), makeExactICmpRegion(), makeSatisfyingICmpRegion(), processUGT_ADDCST_ADD(), and truncateIVUse().

◆ makeExactICmpRegion()

ConstantRange ConstantRange::makeExactICmpRegion ( CmpInst::Predicate  Pred,
const APInt Other 
)
static

Produce the exact range such that all values in the returned range satisfy the given predicate with any value contained within Other.

Formally, this returns the exact answer when the superset of 'union over all y in Other is exactly same as the subset of intersection over all y in Other. { x : icmp op x y is true}'.

Example: Pred = ult and Other = i8 3 returns [0, 3)

Definition at line 132 of file ConstantRange.cpp.

References assert(), makeAllowedICmpRegion(), and makeSatisfyingICmpRegion().

Referenced by llvm::JumpThreadingPass::ComputeValueKnownInPredecessors(), foldICmpShlOne(), llvm::ScalarEvolution::forgetValue(), getEquivalentICmp(), getPredicateResult(), isImpliedCondMatchingImmOperands(), processUGT_ADDCST_ADD(), simplifyAndOrOfICmpsWithConstants(), llvm::ScalarEvolution::SimplifyICmpOperands(), and simplifyICmpWithConstant().

◆ makeGuaranteedNoWrapRegion()

ConstantRange ConstantRange::makeGuaranteedNoWrapRegion ( Instruction::BinaryOps  BinOp,
const ConstantRange Other,
unsigned  NoWrapKind 
)
static

Return the largest range containing all X such that "X BinOpC Y" is guaranteed not to wrap (overflow) for all Y in Other.

NB! The returned set does not contain all possible values of X for which "X BinOpC Y" does not wrap – some viable values of X may be missing, so you cannot use this to constrain X's range. E.g. in the last example, "(-2) + 1" is both nsw and nuw (so the "X" could be -2), but (-2) is not in the set returned.

Examples: typedef OverflowingBinaryOperator OBO; #define MGNR makeGuaranteedNoWrapRegion MGNR(Add, [i8 1, 2), OBO::NoSignedWrap) == [-128, 127) MGNR(Add, [i8 1, 2), OBO::NoUnsignedWrap) == [0, -1) MGNR(Add, [i8 0, 1), OBO::NoUnsignedWrap) == Full Set MGNR(Add, [i8 1, 2), OBO::NoUnsignedWrap | OBO::NoSignedWrap) == [0,INT_MAX) MGNR(Add, [i8 -1, 6), OBO::NoSignedWrap) == [INT_MIN+1, INT_MAX-4)

Definition at line 179 of file ConstantRange.cpp.

References llvm::MCID::Add, assert(), C, ConstantRange(), getBitWidth(), llvm::APInt::getNullValue(), getSignedMax(), getSignedMin(), llvm::APInt::getSignedMinValue(), getSingleElement(), getUnsignedMax(), inverse(), llvm::APInt::isNegative(), llvm::APInt::isStrictlyPositive(), and unionWith().

Referenced by addWithNoSignedWrap(), processAdd(), PushDefUseChildren(), and StrengthenNoWrapFlags().

◆ makeSatisfyingICmpRegion()

ConstantRange ConstantRange::makeSatisfyingICmpRegion ( CmpInst::Predicate  Pred,
const ConstantRange Other 
)
static

Produce the largest range such that all values in the returned range satisfy the given predicate with all values contained within Other.

Formally, this returns a subset of 'intersection over all y in Other . { x : icmp op x y is true }'. If the exact answer is not representable as a ConstantRange, the return value will be a proper subset of the above.

Example: Pred = ult and Other = i8 [2, 5) returns [0, 2)

Definition at line 122 of file ConstantRange.cpp.

References llvm::CmpInst::getInversePredicate(), inverse(), and makeAllowedICmpRegion().

Referenced by IsKnownPredicateViaMinOrMax(), llvm::ScalarEvolution::isLoopInvariantPredicate(), makeExactICmpRegion(), and SimplifyICmpInst().

◆ multiply()

ConstantRange ConstantRange::multiply ( const ConstantRange Other) const

Return a new range representing the possible values resulting from a multiplication of a value in this range and a value in Other, treating both this and Other as unsigned ranges.

Definition at line 731 of file ConstantRange.cpp.

References A, B, llvm::MCID::Compare, ConstantRange(), getBitWidth(), getSignedMax(), getSignedMin(), getUnsignedMax(), getUnsignedMin(), getUpper(), isEmptySet(), llvm::APInt::isMinSignedValue(), llvm::APInt::isNonNegative(), isSizeStrictlySmallerThan(), isWrappedSet(), llvm::max(), llvm::APInt::sext(), llvm::APInt::slt(), truncate(), and llvm::APInt::zext().

Referenced by binaryOp(), and GetRangeFromMetadata().

◆ operator!=()

bool llvm::ConstantRange::operator!= ( const ConstantRange CR) const
inline

◆ operator==()

bool llvm::ConstantRange::operator== ( const ConstantRange CR) const
inline

Return true if this range is equal to another range.

Definition at line 191 of file ConstantRange.h.

◆ print()

void ConstantRange::print ( raw_ostream OS) const

Print out the bounds to a stream.

Definition at line 933 of file ConstantRange.cpp.

References isEmptySet(), and isFullSet().

Referenced by dump(), llvm::operator<<(), and llvm::ScalarEvolution::print().

◆ sextOrTrunc()

ConstantRange ConstantRange::sextOrTrunc ( uint32_t  BitWidth) const

Make this range have the bit width given by BitWidth.

The value is sign extended, truncated, or left alone to make it that width.

Definition at line 632 of file ConstantRange.cpp.

References getBitWidth(), signExtend(), and truncate().

Referenced by llvm::ScalarEvolution::getSignExtendExpr().

◆ shl()

ConstantRange ConstantRange::shl ( const ConstantRange Other) const

Return a new range representing the possible values resulting from a left shift of a value in this range by a value in Other.

TODO: This isn't fully implemented yet.

Definition at line 892 of file ConstantRange.cpp.

References ConstantRange(), llvm::APInt::countLeadingZeros(), getBitWidth(), getUnsignedMax(), getUnsignedMin(), isEmptySet(), llvm::max(), and llvm::APInt::uge().

Referenced by binaryOp().

◆ signExtend()

ConstantRange ConstantRange::signExtend ( uint32_t  BitWidth) const

Return a new range in the specified integer type, which must be strictly larger than the current type.

The returned range will correspond to the possible range of values if the source range had been sign extended to BitWidth.

Definition at line 551 of file ConstantRange.cpp.

References assert(), ConstantRange(), getBitWidth(), llvm::APInt::getHighBitsSet(), llvm::APInt::getLowBitsSet(), isEmptySet(), isFullSet(), llvm::APInt::isMinSignedValue(), isSignWrappedSet(), llvm::APInt::sext(), and llvm::APInt::zext().

Referenced by castOp(), GetRangeFromMetadata(), llvm::ScalarEvolution::getSignExtendExpr(), and sextOrTrunc().

◆ smax()

ConstantRange ConstantRange::smax ( const ConstantRange Other) const

Return a new range representing the possible values resulting from a signed maximum of a value in this range and a value in Other.

Definition at line 785 of file ConstantRange.cpp.

References ConstantRange(), getBitWidth(), getSignedMax(), getSignedMin(), isEmptySet(), and llvm::APIntOps::smax().

Referenced by GetRangeFromMetadata(), and isObjectDereferencedInBlock().

◆ smin()

ConstantRange ConstantRange::smin ( const ConstantRange Other) const

Return a new range representing the possible values resulting from a signed minimum of a value in this range and a value in Other.

Definition at line 811 of file ConstantRange.cpp.

References ConstantRange(), getBitWidth(), getSignedMax(), getSignedMin(), isEmptySet(), and llvm::APIntOps::smin().

Referenced by isObjectDereferencedInBlock().

◆ sub()

ConstantRange ConstantRange::sub ( const ConstantRange Other) const

Return a new range representing the possible values resulting from a subtraction of a value in this range and a value in Other.

Definition at line 711 of file ConstantRange.cpp.

References ConstantRange(), getBitWidth(), getLower(), getUpper(), isEmptySet(), isFullSet(), isSizeStrictlySmallerThan(), and X.

Referenced by binaryOp().

◆ subtract()

ConstantRange ConstantRange::subtract ( const APInt CI) const

Subtract the specified constant from the endpoints of this constant range.

Definition at line 334 of file ConstantRange.cpp.

References assert(), ConstantRange(), getBitWidth(), and llvm::APInt::getBitWidth().

Referenced by foldICmpShlOne(), GetConstantInt(), llvm::SCEVAddRecExpr::getNumIterationsInRange(), and getValueFromICmpCondition().

◆ truncate()

ConstantRange ConstantRange::truncate ( uint32_t  BitWidth) const

Return a new range in the specified integer type, which must be strictly smaller than the current type.

The returned range will correspond to the possible range of values if the source range had been truncated to the specified type.

Definition at line 569 of file ConstantRange.cpp.

References assert(), llvm::APInt::clearBit(), ConstantRange(), llvm::APInt::countTrailingOnes(), llvm::APInt::getActiveBits(), llvm::APInt::getBitsSetFrom(), getBitWidth(), llvm::APInt::getMaxValue(), isEmptySet(), isFullSet(), isWrappedSet(), llvm::APInt::setAllBits(), llvm::APInt::trunc(), llvm::APInt::ult(), and unionWith().

Referenced by castOp(), GetRangeFromMetadata(), llvm::ScalarEvolution::getSignExtendExpr(), llvm::ScalarEvolution::getZeroExtendExpr(), multiply(), sextOrTrunc(), and zextOrTrunc().

◆ udiv()

ConstantRange ConstantRange::udiv ( const ConstantRange Other) const

Return a new range representing the possible values resulting from an unsigned division of a value in this range and a value in Other.

Definition at line 837 of file ConstantRange.cpp.

References ConstantRange(), getBitWidth(), getLower(), getUnsignedMax(), getUnsignedMin(), getUpper(), isEmptySet(), isFullSet(), llvm::APInt::isNullValue(), and llvm::APInt::udiv().

Referenced by binaryOp(), and GetRangeFromMetadata().

◆ umax()

ConstantRange ConstantRange::umax ( const ConstantRange Other) const

Return a new range representing the possible values resulting from an unsigned maximum of a value in this range and a value in Other.

Definition at line 798 of file ConstantRange.cpp.

References ConstantRange(), getBitWidth(), getUnsignedMax(), getUnsignedMin(), isEmptySet(), and llvm::APIntOps::umax().

Referenced by binaryOr(), GetRangeFromMetadata(), and isObjectDereferencedInBlock().

◆ umin()

ConstantRange ConstantRange::umin ( const ConstantRange Other) const

Return a new range representing the possible values resulting from an unsigned minimum of a value in this range and a value in Other.

Definition at line 824 of file ConstantRange.cpp.

References ConstantRange(), getBitWidth(), getUnsignedMax(), getUnsignedMin(), isEmptySet(), and llvm::APIntOps::umin().

Referenced by binaryAnd(), and isObjectDereferencedInBlock().

◆ unionWith()

ConstantRange ConstantRange::unionWith ( const ConstantRange CR) const

Return the range that results from the union of this range with another range.

The resultant range is guaranteed to include the elements of both sets, but may contain more. For example, [3, 9) union [12,15) is [3, 15), which includes 9, 10, and 11, which were not included in either set before.

Definition at line 420 of file ConstantRange.cpp.

References assert(), ConstantRange(), getBitWidth(), isEmptySet(), isFullSet(), llvm::APInt::isNullValue(), isWrappedSet(), llvm::APInt::uge(), llvm::APInt::ugt(), llvm::APInt::ule(), llvm::APInt::ult(), and unionWith().

Referenced by llvm::createLazyValueInfoPass(), getEdgeValueLocal(), getRangeForAffineARHelper(), makeGuaranteedNoWrapRegion(), mapBinOpcode(), truncate(), tryMergeRange(), and unionWith().

◆ zeroExtend()

ConstantRange ConstantRange::zeroExtend ( uint32_t  BitWidth) const

Return a new range in the specified integer type, which must be strictly larger than the current type.

The returned range will correspond to the possible range of values if the source range had been zero extended to BitWidth.

Definition at line 534 of file ConstantRange.cpp.

References assert(), ConstantRange(), getBitWidth(), llvm::APInt::getOneBitSet(), isEmptySet(), isFullSet(), isWrappedSet(), and llvm::APInt::zext().

Referenced by castOp(), GetRangeFromMetadata(), llvm::ScalarEvolution::getZeroExtendExpr(), and zextOrTrunc().

◆ zextOrTrunc()

ConstantRange ConstantRange::zextOrTrunc ( uint32_t  BitWidth) const

Make this range have the bit width given by BitWidth.

The value is zero extended, truncated, or left alone to make it that width.

Definition at line 623 of file ConstantRange.cpp.

References getBitWidth(), truncate(), and zeroExtend().

Referenced by llvm::ScalarEvolution::getZeroExtendExpr().


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