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LLVM
3.7.0
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SCEV - This class represents an analyzed expression in the program. More...
#include <ScalarEvolution.h>
Public Types | |
| enum | NoWrapFlags { FlagAnyWrap = 0, FlagNW = (1 << 0), FlagNUW = (1 << 1), FlagNSW = (1 << 2), NoWrapMask = (1 << 3) -1 } |
| NoWrapFlags are bitfield indices into SubclassData. More... | |
Public Member Functions | |
| SCEV (const FoldingSetNodeIDRef ID, unsigned SCEVTy) | |
| unsigned | getSCEVType () const |
| Type * | getType () const |
| getType - Return the LLVM type of this SCEV expression. More... | |
| bool | isZero () const |
| isZero - Return true if the expression is a constant zero. More... | |
| bool | isOne () const |
| isOne - Return true if the expression is a constant one. More... | |
| bool | isAllOnesValue () const |
| isAllOnesValue - Return true if the expression is a constant all-ones value. More... | |
| bool | isNonConstantNegative () const |
| isNonConstantNegative - Return true if the specified scev is negated, but not a constant. More... | |
| void | print (raw_ostream &OS) const |
| print - Print out the internal representation of this scalar to the specified stream. More... | |
| void | dump () const |
| dump - This method is used for debugging. More... | |
Public Member Functions inherited from llvm::FoldingSetImpl::Node | |
| Node () | |
| void * | getNextInBucket () const |
| void | SetNextInBucket (void *N) |
Protected Attributes | |
| unsigned short | SubclassData |
| SubclassData - This field is initialized to zero and may be used in subclasses to store miscellaneous information. More... | |
Friends | |
| struct | FoldingSetTrait< SCEV > |
SCEV - This class represents an analyzed expression in the program.
These are opaque objects that the client is not allowed to do much with directly.
Definition at line 58 of file ScalarEvolution.h.
NoWrapFlags are bitfield indices into SubclassData.
Add and Mul expressions may have no-unsigned-wrap <NUW> or no-signed-wrap <NSW> properties, which are derived from the IR operator. NSW is a misnomer that we use to mean no signed overflow or underflow.
AddRec expressions may have a no-self-wraparound <NW> property if, in the integer domain, abs(step) * max-iteration(loop) <= unsigned-max(bitwidth). This means that the recurrence will never reach its start value if the step is non-zero. Computing the same value on each iteration is not considered wrapping, and recurrences with step = 0 are trivially <NW>. <NW> is independent of the sign of step and the value the add recurrence starts with.
Note that NUW and NSW are also valid properties of a recurrence, and either implies NW. For convenience, NW will be set for a recurrence whenever either NUW or NSW are set.
| Enumerator | |
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| FlagAnyWrap | |
| FlagNW | |
| FlagNUW | |
| FlagNSW | |
| NoWrapMask | |
Definition at line 96 of file ScalarEvolution.h.
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inlineexplicit |
Definition at line 102 of file ScalarEvolution.h.
| void SCEV::dump | ( | ) | const |
dump - This method is used for debugging.
Definition at line 136 of file ScalarEvolution.cpp.
References llvm::dbgs(), and print().
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inline |
Definition at line 105 of file ScalarEvolution.h.
Referenced by BuildConstantFromSCEV(), llvm::SCEVConstant::classof(), llvm::SCEVCastExpr::classof(), llvm::SCEVTruncateExpr::classof(), llvm::SCEVZeroExtendExpr::classof(), llvm::SCEVSignExtendExpr::classof(), llvm::SCEVCouldNotCompute::classof(), llvm::SCEVNAryExpr::classof(), llvm::SCEVCommutativeExpr::classof(), llvm::SCEVAddExpr::classof(), llvm::SCEVMulExpr::classof(), llvm::SCEVUDivExpr::classof(), llvm::SCEVAddRecExpr::classof(), llvm::SCEVSMaxExpr::classof(), llvm::SCEVUMaxExpr::classof(), llvm::SCEVUnknown::classof(), getExprBase(), getType(), GroupByComplexity(), isHighCostExpansion(), print(), llvm::SCEVVisitor< SCEVExpander, Value * >::visit(), and llvm::SCEVTraversal< SV >::visitAll().
| Type * SCEV::getType | ( | ) | const |
getType - Return the LLVM type of this SCEV expression.
Definition at line 252 of file ScalarEvolution.cpp.
References getSCEVType(), llvm_unreachable, llvm::scAddExpr, llvm::scAddRecExpr, llvm::scConstant, llvm::scCouldNotCompute, llvm::scMulExpr, llvm::scSignExtend, llvm::scSMaxExpr, llvm::scTruncate, llvm::scUDivExpr, llvm::scUMaxExpr, llvm::scUnknown, and llvm::scZeroExtend.
Referenced by BinomialCoefficient(), BuildConstantFromSCEV(), CanBeSMax(), CanBeSMin(), FactorOutConstant(), FindLoopCounter(), genLoopLimit(), llvm::ScalarEvolution::getAddExpr(), llvm::ScalarEvolution::getAnyExtendExpr(), getExactSDiv(), llvm::ScalarEvolution::getGEPExpr(), llvm::ScalarEvolution::getMinusSCEV(), llvm::ScalarEvolution::getNegativeSCEV(), getNewAlignment(), llvm::ScalarEvolution::getNoopOrAnyExtend(), llvm::ScalarEvolution::getNoopOrSignExtend(), llvm::ScalarEvolution::getNoopOrZeroExtend(), llvm::ScalarEvolution::getNotSCEV(), llvm::ScalarEvolution::getPointerBase(), getSignedOverflowLimitForStep(), llvm::ScalarEvolution::getSignExtendExpr(), llvm::ScalarEvolution::getTruncateExpr(), llvm::ScalarEvolution::getTruncateOrNoop(), llvm::ScalarEvolution::getTruncateOrSignExtend(), llvm::ScalarEvolution::getTruncateOrZeroExtend(), llvm::SCEVNAryExpr::getType(), llvm::SCEVAddExpr::getType(), llvm::SCEVUDivExpr::getType(), llvm::ScalarEvolution::getUDivExpr(), llvm::ScalarEvolution::getUMaxFromMismatchedTypes(), llvm::ScalarEvolution::getUMinFromMismatchedTypes(), getUnsignedOverflowLimitForStep(), llvm::ScalarEvolution::getZeroExtendExpr(), isAddFoldable(), llvm::ScalarEvolution::SimplifyICmpOperands(), and llvm::UnrollRuntimeLoopProlog().
| bool SCEV::isAllOnesValue | ( | ) | const |
isAllOnesValue - Return true if the expression is a constant all-ones value.
Definition at line 289 of file ScalarEvolution.cpp.
References llvm::PPCISD::SC.
| bool SCEV::isNonConstantNegative | ( | ) | const |
isNonConstantNegative - Return true if the specified scev is negated, but not a constant.
Definition at line 297 of file ScalarEvolution.cpp.
References llvm::dyn_cast(), llvm::SCEVNAryExpr::getOperand(), llvm::SCEVConstant::getValue(), llvm::ConstantInt::getValue(), llvm::APInt::isNegative(), and llvm::PPCISD::SC.
| bool SCEV::isOne | ( | ) | const |
isOne - Return true if the expression is a constant one.
Definition at line 283 of file ScalarEvolution.cpp.
References llvm::PPCISD::SC.
Referenced by FactorOutConstant(), FindLoopCounter(), and genLoopLimit().
| bool SCEV::isZero | ( | ) | const |
isZero - Return true if the expression is a constant zero.
Definition at line 277 of file ScalarEvolution.cpp.
References llvm::PPCISD::SC.
Referenced by canExpandBackedgeTakenCount(), CollectSubexprs(), FactorOutConstant(), findArrayDimensionsRec(), FindLoopCounter(), genLoopLimit(), llvm::ScalarEvolution::getAddRecExpr(), isAlwaysFoldable(), and SplitAddRecs().
| void SCEV::print | ( | raw_ostream & | OS | ) | const |
print - Print out the internal representation of this scalar to the specified stream.
This should really only be used for debugging purposes.
Definition at line 142 of file ScalarEvolution.cpp.
References FlagNSW, FlagNUW, FlagNW, llvm::LoopBase< N, M >::getHeader(), llvm::SCEVUDivExpr::getLHS(), llvm::SCEVAddRecExpr::getLoop(), llvm::SCEVNAryExpr::getNoWrapFlags(), llvm::SCEVNAryExpr::getNumOperands(), llvm::SCEVCastExpr::getOperand(), llvm::SCEVNAryExpr::getOperand(), llvm::SCEVUDivExpr::getRHS(), getSCEVType(), llvm::SCEVCastExpr::getType(), llvm::SCEVUnknown::getValue(), I, llvm::SCEVUnknown::isAlignOf(), llvm::SCEVUnknown::isOffsetOf(), llvm::SCEVUnknown::isSizeOf(), llvm_unreachable, llvm::SCEVNAryExpr::op_begin(), llvm::SCEVNAryExpr::op_end(), llvm::Value::printAsOperand(), llvm::scAddExpr, llvm::scAddRecExpr, llvm::scConstant, llvm::scCouldNotCompute, llvm::scMulExpr, llvm::scSignExtend, llvm::scSMaxExpr, llvm::scTruncate, llvm::scUDivExpr, llvm::scUMaxExpr, llvm::scUnknown, and llvm::scZeroExtend.
Referenced by dump(), getLoopBackedgeTakenCounts(), llvm::operator<<(), and llvm::ScalarEvolution::print().
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Definition at line 59 of file ScalarEvolution.h.
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protected |
SubclassData - This field is initialized to zero and may be used in subclasses to store miscellaneous information.
Definition at line 71 of file ScalarEvolution.h.
Referenced by llvm::SCEVNAryExpr::getNoWrapFlags(), llvm::SCEVCommutativeExpr::setNoWrapFlags(), and llvm::SCEVAddRecExpr::setNoWrapFlags().
1.8.6