LLVM 18.0.0git
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#include "llvm/Analysis/ValueTracking.h"
Public Member Functions | |
bool | isKnownNever (FPClassTest Mask) const |
Return true if it's known this can never be one of the mask entries. | |
bool | isUnknown () const |
bool | isKnownNeverNaN () const |
Return true if it's known this can never be a nan. | |
bool | isKnownNeverInfinity () const |
Return true if it's known this can never be an infinity. | |
bool | isKnownNeverPosInfinity () const |
Return true if it's known this can never be +infinity. | |
bool | isKnownNeverNegInfinity () const |
Return true if it's known this can never be -infinity. | |
bool | isKnownNeverSubnormal () const |
Return true if it's known this can never be a subnormal. | |
bool | isKnownNeverPosSubnormal () const |
Return true if it's known this can never be a positive subnormal. | |
bool | isKnownNeverNegSubnormal () const |
Return true if it's known this can never be a negative subnormal. | |
bool | isKnownNeverZero () const |
Return true if it's known this can never be a zero. | |
bool | isKnownNeverPosZero () const |
Return true if it's known this can never be a literal positive zero. | |
bool | isKnownNeverNegZero () const |
Return true if it's known this can never be a negative zero. | |
bool | isKnownNeverLogicalZero (const Function &F, Type *Ty) const |
Return true if it's know this can never be interpreted as a zero. | |
bool | isKnownNeverLogicalNegZero (const Function &F, Type *Ty) const |
Return true if it's know this can never be interpreted as a negative zero. | |
bool | isKnownNeverLogicalPosZero (const Function &F, Type *Ty) const |
Return true if it's know this can never be interpreted as a positive zero. | |
bool | cannotBeOrderedLessThanZero () const |
Return true if we can prove that the analyzed floating-point value is either NaN or never less than -0.0. | |
bool | cannotBeOrderedGreaterThanZero () const |
Return true if we can prove that the analyzed floating-point value is either NaN or never greater than -0.0. | |
KnownFPClass & | operator|= (const KnownFPClass &RHS) |
void | knownNot (FPClassTest RuleOut) |
void | fneg () |
void | fabs () |
bool | signBitIsZeroOrNaN () const |
Return true if the sign bit must be 0, ignoring the sign of nans. | |
void | signBitMustBeZero () |
Assume the sign bit is zero. | |
void | copysign (const KnownFPClass &Sign) |
void | propagateNaN (const KnownFPClass &Src, bool PreserveSign=false) |
void | propagateDenormal (const KnownFPClass &Src, const Function &F, Type *Ty) |
Propagate knowledge from a source value that could be a denormal or zero. | |
void | propagateCanonicalizingSrc (const KnownFPClass &Src, const Function &F, Type *Ty) |
Report known classes if Src is evaluated through a potentially canonicalizing operation. | |
void | resetAll () |
Public Attributes | |
FPClassTest | KnownFPClasses = fcAllFlags |
Floating-point classes the value could be one of. | |
std::optional< bool > | SignBit |
std::nullopt if the sign bit is unknown, true if the sign bit is definitely set or false if the sign bit is definitely unset. | |
Static Public Attributes | |
static constexpr FPClassTest | OrderedLessThanZeroMask |
static constexpr FPClassTest | OrderedGreaterThanZeroMask |
Definition at line 217 of file ValueTracking.h.
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Return true if we can prove that the analyzed floating-point value is either NaN or never greater than -0.0.
NaN --> true +0 --> true -0 --> true x > +0 --> false x < -0 --> true
Definition at line 321 of file ValueTracking.h.
References isKnownNever(), and OrderedGreaterThanZeroMask.
Referenced by computeKnownFPClass().
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Return true if we can prove that the analyzed floating-point value is either NaN or never less than -0.0.
NaN --> true +0 --> true -0 --> true
x > +0 --> true x < -0 --> false
Definition at line 310 of file ValueTracking.h.
References isKnownNever(), and OrderedLessThanZeroMask.
Referenced by llvm::cannotBeOrderedLessThanZero(), computeKnownFPClass(), computeKnownFPClassForFPTrunc(), and simplifyFCmpInst().
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Definition at line 370 of file ValueTracking.h.
References llvm::fcInf, llvm::fcNan, llvm::fcNegative, llvm::fcNormal, llvm::fcPositive, llvm::fcSubnormal, llvm::fcZero, isKnownNever(), KnownFPClasses, and SignBit.
Referenced by computeKnownFPClass().
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Definition at line 343 of file ValueTracking.h.
References llvm::fcNegInf, llvm::fcNegNormal, llvm::fcNegSubnormal, llvm::fcNegZero, llvm::fcPosInf, llvm::fcPosNormal, llvm::fcPosSubnormal, llvm::fcPosZero, KnownFPClasses, and signBitMustBeZero().
Referenced by computeKnownFPClass().
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Definition at line 337 of file ValueTracking.h.
References llvm::fneg(), KnownFPClasses, and SignBit.
Referenced by computeKnownFPClass().
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Return true if it's known this can never be one of the mask entries.
Definition at line 226 of file ValueTracking.h.
References llvm::fcNone, and KnownFPClasses.
Referenced by cannotBeOrderedGreaterThanZero(), cannotBeOrderedLessThanZero(), computeKnownFPClass(), copysign(), isKnownNeverInfinity(), isKnownNeverNaN(), isKnownNeverNegInfinity(), isKnownNeverNegSubnormal(), isKnownNeverNegZero(), isKnownNeverPosInfinity(), isKnownNeverPosSubnormal(), isKnownNeverPosZero(), isKnownNeverSubnormal(), isKnownNeverZero(), and signBitIsZeroOrNaN().
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Return true if it's known this can never be an infinity.
Definition at line 240 of file ValueTracking.h.
References llvm::fcInf, and isKnownNever().
Referenced by computeKnownFPClass(), llvm::isKnownNeverInfinity(), and llvm::isKnownNeverInfOrNaN().
Return true if it's know this can never be interpreted as a negative zero.
Definition at line 3871 of file ValueTracking.cpp.
References F, inputDenormalIsIEEEOrPosZero(), isKnownNeverNegSubnormal(), and isKnownNeverNegZero().
Referenced by computeKnownFPClass().
Return true if it's know this can never be interpreted as a positive zero.
Definition at line 3877 of file ValueTracking.cpp.
References F, llvm::Type::getFltSemantics(), llvm::Type::getScalarType(), llvm::DenormalMode::IEEE, isKnownNeverPosSubnormal(), isKnownNeverPosZero(), isKnownNeverSubnormal(), llvm_unreachable, llvm::DenormalMode::PositiveZero, and llvm::DenormalMode::PreserveSign.
Referenced by computeKnownFPClass().
Return true if it's know this can never be interpreted as a zero.
This extends isKnownNeverZero to cover the case where the assumed floating-point mode for the function interprets denormals as zero.
Definition at line 3866 of file ValueTracking.cpp.
References F, inputDenormalIsIEEE(), isKnownNeverSubnormal(), and isKnownNeverZero().
Referenced by computeKnownFPClass().
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Return true if it's known this can never be a nan.
Definition at line 235 of file ValueTracking.h.
References llvm::fcNan, and isKnownNever().
Referenced by computeKnownFPClass(), llvm::isKnownNeverInfOrNaN(), llvm::isKnownNeverNaN(), and simplifyFCmpInst().
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Return true if it's known this can never be -infinity.
Definition at line 250 of file ValueTracking.h.
References llvm::fcNegInf, and isKnownNever().
Referenced by computeKnownFPClass().
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Return true if it's known this can never be a negative subnormal.
Definition at line 265 of file ValueTracking.h.
References llvm::fcNegSubnormal, and isKnownNever().
Referenced by computeKnownFPClass(), and isKnownNeverLogicalNegZero().
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Return true if it's known this can never be a negative zero.
This means a literal -0 and does not include denormal inputs implicitly treated as -0.
Definition at line 282 of file ValueTracking.h.
References llvm::fcNegZero, and isKnownNever().
Referenced by llvm::cannotBeNegativeZero(), and isKnownNeverLogicalNegZero().
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Return true if it's known this can never be +infinity.
Definition at line 245 of file ValueTracking.h.
References llvm::fcPosInf, and isKnownNever().
Referenced by computeKnownFPClass().
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Return true if it's known this can never be a positive subnormal.
Definition at line 260 of file ValueTracking.h.
References llvm::fcPosSubnormal, and isKnownNever().
Referenced by computeKnownFPClass(), and isKnownNeverLogicalPosZero().
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Return true if it's known this can never be a literal positive zero.
Definition at line 276 of file ValueTracking.h.
References llvm::fcPosZero, and isKnownNever().
Referenced by isKnownNeverLogicalPosZero().
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Return true if it's known this can never be a subnormal.
Definition at line 255 of file ValueTracking.h.
References llvm::fcSubnormal, and isKnownNever().
Referenced by computeKnownFPClass(), isKnownNeverLogicalPosZero(), and isKnownNeverLogicalZero().
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Return true if it's known this can never be a zero.
This means a literal [+-]0, and does not include denormal inputs implicitly treated as [+-]0.
Definition at line 271 of file ValueTracking.h.
References llvm::fcZero, and isKnownNever().
Referenced by isKnownNeverLogicalZero().
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Definition at line 230 of file ValueTracking.h.
References llvm::fcAllFlags, KnownFPClasses, and SignBit.
Referenced by computeKnownFPClass().
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Definition at line 333 of file ValueTracking.h.
References KnownFPClasses.
Referenced by computeKnownFPClass(), computeKnownFPClassForFPTrunc(), and propagateNaN().
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Definition at line 325 of file ValueTracking.h.
References KnownFPClasses, RHS, and SignBit.
void KnownFPClass::propagateCanonicalizingSrc | ( | const KnownFPClass & | Src, |
const Function & | F, | ||
Type * | Ty | ||
) |
Report known classes if Src
is evaluated through a potentially canonicalizing operation.
We can assume signaling nans will not be introduced, but cannot assume a denormal will be flushed under FTZ/DAZ.
This assumes a copy-like operation and will replace any currently known information.
Definition at line 3931 of file ValueTracking.cpp.
References F, propagateDenormal(), and propagateNaN().
Referenced by computeKnownFPClass().
void KnownFPClass::propagateDenormal | ( | const KnownFPClass & | Src, |
const Function & | F, | ||
Type * | Ty | ||
) |
Propagate knowledge from a source value that could be a denormal or zero.
We have to be conservative since output flushing is not guaranteed, so known-never-zero may not hold.
This assumes a copy-like operation and will replace any currently known information.
Definition at line 3902 of file ValueTracking.cpp.
References llvm::DenormalMode::Dynamic, F, llvm::fcNegZero, llvm::fcPosZero, llvm::Type::getFltSemantics(), llvm::DenormalMode::getIEEE(), llvm::DenormalMode::getPositiveZero(), llvm::Type::getScalarType(), KnownFPClasses, and llvm::DenormalMode::PositiveZero.
Referenced by propagateCanonicalizingSrc().
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Definition at line 395 of file ValueTracking.h.
References llvm::fcNan, llvm::fcSNan, knownNot(), and SignBit.
Referenced by computeKnownFPClass(), computeKnownFPClassForFPTrunc(), and propagateCanonicalizingSrc().
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Definition at line 421 of file ValueTracking.h.
Referenced by computeKnownFPClass().
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Return true if the sign bit must be 0, ignoring the sign of nans.
Definition at line 360 of file ValueTracking.h.
References llvm::fcNegative, and isKnownNever().
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Assume the sign bit is zero.
Definition at line 365 of file ValueTracking.h.
References llvm::fcNan, llvm::fcPositive, KnownFPClasses, and SignBit.
Referenced by computeKnownFPClass(), and fabs().
FPClassTest llvm::KnownFPClass::KnownFPClasses = fcAllFlags |
Floating-point classes the value could be one of.
Definition at line 219 of file ValueTracking.h.
Referenced by computeKnownFPClass(), copysign(), fabs(), fneg(), isKnownNever(), isUnknown(), knownNot(), operator|=(), propagateDenormal(), and signBitMustBeZero().
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staticconstexpr |
Definition at line 299 of file ValueTracking.h.
Referenced by cannotBeOrderedGreaterThanZero(), and computeKnownFPClass().
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staticconstexpr |
Definition at line 297 of file ValueTracking.h.
Referenced by cannotBeOrderedLessThanZero(), llvm::cannotBeOrderedLessThanZero(), computeKnownFPClass(), computeKnownFPClassForFPTrunc(), and simplifyFCmpInst().
std::optional<bool> llvm::KnownFPClass::SignBit |
std::nullopt if the sign bit is unknown, true if the sign bit is definitely set or false if the sign bit is definitely unset.
Definition at line 223 of file ValueTracking.h.
Referenced by computeKnownFPClass(), copysign(), fneg(), isUnknown(), operator|=(), propagateNaN(), and signBitMustBeZero().