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LLVM
4.0.0
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An interface layer with SCEV used to manage how we see SCEV expressions for values in the context of existing predicates. More...
#include <ScalarEvolution.h>
Public Member Functions | |
| PredicatedScalarEvolution (ScalarEvolution &SE, Loop &L) | |
| const SCEVUnionPredicate & | getUnionPredicate () const |
| const SCEV * | getSCEV (Value *V) |
| Returns the SCEV expression of V, in the context of the current SCEV predicate. More... | |
| const SCEV * | getBackedgeTakenCount () |
| Get the (predicated) backedge count for the analyzed loop. More... | |
| void | addPredicate (const SCEVPredicate &Pred) |
| Adds a new predicate. More... | |
| const SCEVAddRecExpr * | getAsAddRec (Value *V) |
| Attempts to produce an AddRecExpr for V by adding additional SCEV predicates. More... | |
| void | setNoOverflow (Value *V, SCEVWrapPredicate::IncrementWrapFlags Flags) |
| Proves that V doesn't overflow by adding SCEV predicate. More... | |
| bool | hasNoOverflow (Value *V, SCEVWrapPredicate::IncrementWrapFlags Flags) |
| Returns true if we've proved that V doesn't wrap by means of a SCEV predicate. More... | |
| ScalarEvolution * | getSE () const |
| Returns the ScalarEvolution analysis used. More... | |
| PredicatedScalarEvolution (const PredicatedScalarEvolution &) | |
| We need to explicitly define the copy constructor because of FlagsMap. More... | |
| void | print (raw_ostream &OS, unsigned Depth) const |
| Print the SCEV mappings done by the Predicated Scalar Evolution. More... | |
An interface layer with SCEV used to manage how we see SCEV expressions for values in the context of existing predicates.
We can add new predicates, but we cannot remove them.
This layer has multiple purposes:
Definition at line 1680 of file ScalarEvolution.h.
| PredicatedScalarEvolution::PredicatedScalarEvolution | ( | ScalarEvolution & | SE, |
| Loop & | L | ||
| ) |
Definition at line 10381 of file ScalarEvolution.cpp.
| PredicatedScalarEvolution::PredicatedScalarEvolution | ( | const PredicatedScalarEvolution & | Init | ) |
We need to explicitly define the copy constructor because of FlagsMap.
Definition at line 10482 of file ScalarEvolution.cpp.
| void PredicatedScalarEvolution::addPredicate | ( | const SCEVPredicate & | Pred | ) |
Adds a new predicate.
Definition at line 10413 of file ScalarEvolution.cpp.
References llvm::SCEVUnionPredicate::add(), and llvm::SCEVUnionPredicate::implies().
Referenced by getBackedgeTakenCount(), llvm::replaceSymbolicStrideSCEV(), and setNoOverflow().
| const SCEVAddRecExpr * PredicatedScalarEvolution::getAsAddRec | ( | Value * | V | ) |
Attempts to produce an AddRecExpr for V by adding additional SCEV predicates.
If we can't transform the expression into an AddRecExpr we return nullptr and not add additional SCEV predicates to the current context.
Definition at line 10466 of file ScalarEvolution.cpp.
References llvm::SCEVUnionPredicate::add(), llvm::ScalarEvolution::convertSCEVToAddRecWithPredicates(), llvm::ScalarEvolution::getSCEV(), getSCEV(), and P.
Referenced by llvm::getPtrStride(), and llvm::InductionDescriptor::isInductionPHI().
Get the (predicated) backedge count for the analyzed loop.
Definition at line 10404 of file ScalarEvolution.cpp.
References addPredicate(), and llvm::ScalarEvolution::getPredicatedBackedgeTakenCount().
Referenced by llvm::RuntimePointerChecking::insert().
Returns the SCEV expression of V, in the context of the current SCEV predicate.
The order of transformations applied on the expression of V returned by ScalarEvolution is guaranteed to be preserved, even when adding new predicates.
Definition at line 10385 of file ScalarEvolution.cpp.
References llvm::ScalarEvolution::getSCEV(), and llvm::ScalarEvolution::rewriteUsingPredicate().
Referenced by getAsAddRec(), hasNoOverflow(), llvm::InductionDescriptor::isInductionPHI(), isNoWrap(), isNoWrapAddRec(), llvm::replaceSymbolicStrideSCEV(), and setNoOverflow().
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inline |
Returns the ScalarEvolution analysis used.
Definition at line 1711 of file ScalarEvolution.h.
Referenced by llvm::getPtrStride(), hasComputableBounds(), llvm::RuntimePointerChecking::insert(), llvm::InductionDescriptor::isInductionPHI(), isNoWrap(), and llvm::replaceSymbolicStrideSCEV().
| const SCEVUnionPredicate & PredicatedScalarEvolution::getUnionPredicate | ( | ) | const |
Definition at line 10420 of file ScalarEvolution.cpp.
Referenced by llvm::LoopVersioning::LoopVersioning(), and llvm::LoopVersioning::versionLoop().
| bool PredicatedScalarEvolution::hasNoOverflow | ( | Value * | V, |
| SCEVWrapPredicate::IncrementWrapFlags | Flags | ||
| ) |
Returns true if we've proved that V doesn't wrap by means of a SCEV predicate.
Definition at line 10450 of file ScalarEvolution.cpp.
References llvm::SCEVWrapPredicate::clearFlags(), llvm::SCEVWrapPredicate::getImpliedFlags(), getSCEV(), and llvm::SCEVWrapPredicate::IncrementAnyWrap.
Referenced by llvm::getPtrStride().
| void PredicatedScalarEvolution::print | ( | raw_ostream & | OS, |
| unsigned | Depth | ||
| ) | const |
Print the SCEV mappings done by the Predicated Scalar Evolution.
The printed text is indented by Depth.
Definition at line 10490 of file ScalarEvolution.cpp.
References llvm::DenseMapBase< DerivedT, KeyT, ValueT, KeyInfoT, BucketT >::end(), llvm::DenseMapBase< DerivedT, KeyT, ValueT, KeyInfoT, BucketT >::find(), llvm::LoopBase< N, M >::getBlocks(), llvm::ScalarEvolution::getSCEV(), llvm::raw_ostream::indent(), and llvm::ScalarEvolution::isSCEVable().
| void PredicatedScalarEvolution::setNoOverflow | ( | Value * | V, |
| SCEVWrapPredicate::IncrementWrapFlags | Flags | ||
| ) |
Proves that V doesn't overflow by adding SCEV predicate.
Definition at line 10434 of file ScalarEvolution.cpp.
References addPredicate(), llvm::SCEVWrapPredicate::clearFlags(), llvm::SCEVWrapPredicate::getImpliedFlags(), getSCEV(), llvm::ScalarEvolution::getWrapPredicate(), and llvm::SCEVWrapPredicate::setFlags().
Referenced by llvm::getPtrStride().
1.8.6