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only supporting reuse of nothing or of block numbers

tempestpy_adaptions
dehnert 7 years ago
parent
a19c2fe59b
commit
669940ccd3
3 changed files with 63 additions and 333 deletions
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  1. 10
      src/storm/settings/modules/BisimulationSettings.cpp
  2. 2
      src/storm/settings/modules/BisimulationSettings.h
  3. 380
      src/storm/storage/dd/bisimulation/SignatureRefiner.cpp

10
src/storm/settings/modules/BisimulationSettings.cpp
View File

@ -31,7 +31,7 @@ namespace storm {
std::vector<std::string> signatureModes = { "eager", "lazy" };
this->addOption(storm::settings::OptionBuilder(moduleName, signatureModeOptionName, false, "Sets the signature computation mode.").addArgument(storm::settings::ArgumentBuilder::createStringArgument("mode", "The mode to use.").addValidatorString(ArgumentValidatorFactory::createMultipleChoiceValidator(signatureModes)).setDefaultValueString("eager").build()).build());
std::vector<std::string> reuseModes = {"all", "none", "blocks", "sig"};
std::vector<std::string> reuseModes = {"none", "blocks"};
this->addOption(storm::settings::OptionBuilder(moduleName, reuseOptionName, true, "Sets whether to reuse all results.")
.addArgument(storm::settings::ArgumentBuilder::createStringArgument("mode", "The mode to use.").addValidatorString(ArgumentValidatorFactory::createMultipleChoiceValidator(reuseModes))
.setDefaultValueString("blocks").build())
@ -76,16 +76,12 @@ namespace storm {
BisimulationSettings::ReuseMode BisimulationSettings::getReuseMode() const {
std::string reuseModeAsString = this->getOption(reuseOptionName).getArgumentByName("mode").getValueAsString();
if (reuseModeAsString == "all") {
return ReuseMode::All;
} else if (reuseModeAsString == "none") {
if (reuseModeAsString == "none") {
return ReuseMode::None;
} else if (reuseModeAsString == "blocks") {
return ReuseMode::BlockNumbers;
} else if (reuseModeAsString == "sig") {
return ReuseMode::SignatureResults;
}
return ReuseMode::All;
return ReuseMode::BlockNumbers;
}
bool BisimulationSettings::check() const {

2
src/storm/settings/modules/BisimulationSettings.h
View File

@ -19,7 +19,7 @@ namespace storm {
enum class QuotientFormat { Sparse, Dd };
enum class ReuseMode { All, None, BlockNumbers, SignatureResults };
enum class ReuseMode { None, BlockNumbers };
/*!
* Creates a new set of bisimulation settings.

380
src/storm/storage/dd/bisimulation/SignatureRefiner.cpp
View File

@ -45,13 +45,11 @@ namespace storm {
auto const& bisimulationSettings = storm::settings::getModule<storm::settings::modules::BisimulationSettings>();
storm::settings::modules::BisimulationSettings::ReuseMode reuseMode = bisimulationSettings.getReuseMode();
this->reuseBlockNumbers = reuseMode == storm::settings::modules::BisimulationSettings::ReuseMode::All || reuseMode == storm::settings::modules::BisimulationSettings::ReuseMode::BlockNumbers;
this->reuseSignatureResult = reuseMode == storm::settings::modules::BisimulationSettings::ReuseMode::All || reuseMode == storm::settings::modules::BisimulationSettings::ReuseMode::SignatureResults;
this->reuseBlockNumbers = reuseMode == storm::settings::modules::BisimulationSettings::ReuseMode::BlockNumbers;
}
bool shiftStateVariables;
bool reuseBlockNumbers;
bool reuseSignatureResult;
};
class ReuseWrapper {
@ -90,63 +88,29 @@ namespace storm {
}
Partition<storm::dd::DdType::CUDD, ValueType> refine(Partition<storm::dd::DdType::CUDD, ValueType> const& oldPartition, Signature<storm::dd::DdType::CUDD, ValueType> const& signature) {
storm::dd::Add<storm::dd::DdType::CUDD, ValueType> newPartitionAdd;
if (options.reuseBlockNumbers && !options.reuseSignatureResult) {
newPartitionAdd = refineReuseBlockNumber(oldPartition, signature.getSignatureAdd());
} else {
newPartitionAdd = refineReuseSignatureResults(oldPartition, signature.getSignatureAdd());
}
storm::dd::Add<storm::dd::DdType::CUDD, ValueType> newPartitionAdd = refine(oldPartition, signature.getSignatureAdd());;
++numberOfRefinements;
uint64_t numberOfBlocks = nextFreeBlockIndex;
if (options.reuseSignatureResult) {
std::set<storm::expressions::Variable> blockVariableSet = {blockVariable};
std::set<storm::expressions::Variable> nonBlockExpressionVariables;
std::set_difference(oldPartition.asAdd().getContainedMetaVariables().begin(), oldPartition.asAdd().getContainedMetaVariables().end(), blockVariableSet.begin(), blockVariableSet.end(), std::inserter(nonBlockExpressionVariables, nonBlockExpressionVariables.begin()));
numberOfBlocks = newPartitionAdd.notZero().existsAbstract(nonBlockExpressionVariables).getNonZeroCount();
}
return oldPartition.replacePartition(newPartitionAdd, numberOfBlocks, nextFreeBlockIndex);
return oldPartition.replacePartition(newPartitionAdd, nextFreeBlockIndex, nextFreeBlockIndex);
}
private:
void clearCaches() {
signatureCache.clear();
signatureCache2.clear();
reuseBlocksCache.clear();
}
storm::dd::Add<storm::dd::DdType::CUDD, ValueType> refineReuseBlockNumber(Partition<storm::dd::DdType::CUDD, ValueType> const& oldPartition, storm::dd::Add<storm::dd::DdType::CUDD, ValueType> const& signatureAdd) {
STORM_LOG_ASSERT(oldPartition.storedAsAdd(), "Expecting partition to be stored as ADD for CUDD.");
nextFreeBlockIndex = oldPartition.getNextFreeBlockIndex();
// Perform the actual recursive refinement step.
DdNodePtr result = refineReuseBlockNumber(oldPartition.asAdd().getInternalAdd().getCuddDdNode(), signatureAdd.getInternalAdd().getCuddDdNode(), nondeterminismVariables.getInternalBdd().getCuddDdNode(), nonBlockVariables.getInternalBdd().getCuddDdNode());
// Construct resulting ADD from the obtained node and the meta information.
storm::dd::InternalAdd<storm::dd::DdType::CUDD, ValueType> internalNewPartitionAdd(&internalDdManager, cudd::ADD(internalDdManager.getCuddManager(), result));
storm::dd::Add<storm::dd::DdType::CUDD, ValueType> newPartitionAdd(oldPartition.asAdd().getDdManager(), internalNewPartitionAdd, oldPartition.asAdd().getContainedMetaVariables());
clearCaches();
return newPartitionAdd;
}
storm::dd::Add<storm::dd::DdType::CUDD, ValueType> refineReuseSignatureResults(Partition<storm::dd::DdType::CUDD, ValueType> const& oldPartition, storm::dd::Add<storm::dd::DdType::CUDD, ValueType> const& signatureAdd) {
storm::dd::Add<storm::dd::DdType::CUDD, ValueType> refine(Partition<storm::dd::DdType::CUDD, ValueType> const& oldPartition, storm::dd::Add<storm::dd::DdType::CUDD, ValueType> const& signatureAdd) {
STORM_LOG_ASSERT(oldPartition.storedAsAdd(), "Expecting partition to be stored as ADD for CUDD.");
nextFreeBlockIndex = options.reuseSignatureResult ? oldPartition.getNextFreeBlockIndex() : 0;
nextFreeBlockIndex = options.reuseBlockNumbers ? oldPartition.getNextFreeBlockIndex() : 0;
// Perform the actual recursive refinement step.
DdNodePtr result = refineReuseSignatureResults(signatureAdd.getInternalAdd().getCuddDdNode(), nondeterminismVariables.getInternalBdd().getCuddDdNode(), nonBlockVariables.getInternalBdd().getCuddDdNode());
DdNodePtr result = refine(oldPartition.asAdd().getInternalAdd().getCuddDdNode(), signatureAdd.getInternalAdd().getCuddDdNode(), nondeterminismVariables.getInternalBdd().getCuddDdNode(), nonBlockVariables.getInternalBdd().getCuddDdNode());
// Construct resulting ADD from the obtained node and the meta information.
storm::dd::InternalAdd<storm::dd::DdType::CUDD, ValueType> internalNewPartitionAdd(&internalDdManager, cudd::ADD(internalDdManager.getCuddManager(), result));
storm::dd::Add<storm::dd::DdType::CUDD, ValueType> newPartitionAdd(oldPartition.asAdd().getDdManager(), internalNewPartitionAdd, oldPartition.asAdd().getContainedMetaVariables());
if (options.reuseSignatureResult) {
oldSignatureCache = signatureCache;
}
clearCaches();
return newPartitionAdd;
}
@ -165,130 +129,39 @@ namespace storm {
return result;
}
DdNodePtr refineReuseSignatureResults(DdNode* signatureNode, DdNode* nondeterminismVariablesNode, DdNode* nonBlockVariablesNode) {
DdNodePtr refine(DdNode* partitionNode, DdNode* signatureNode, DdNode* nondeterminismVariablesNode, DdNode* nonBlockVariablesNode) {
// If we arrived at the constant zero node, then this was an illegal state encoding (we require
// all states to be non-deadlock).
if (signatureNode == Cudd_ReadZero(ddman)) {
return signatureNode;
if (partitionNode == Cudd_ReadZero(ddman)) {
return partitionNode;
}
// Check the cache whether we have seen the same node before.
auto it = signatureCache.find(signatureNode);
auto nodePair = std::make_pair(signatureNode, partitionNode);
auto it = signatureCache.find(nodePair);
if (it != signatureCache.end()) {
// If so, we return the corresponding result.
return it->second;
}
// If we are to reuse signature results, check the old cache.
if (options.reuseSignatureResult) {
it = oldSignatureCache.find(signatureNode);
if (it != oldSignatureCache.end()) {
// If so, we return the corresponding result.
return it->second;
}
}
// If there are no more non-block variables, we hit the signature.
if (Cudd_IsConstant(nonBlockVariablesNode)) {
DdNode* result = encodeBlock(nextFreeBlockIndex++);
signatureCache[signatureNode] = result;
return result;
} else {
// If there are more variables that belong to the non-block part of the encoding, we need to recursively descend.
bool skipped = true;
DdNode* signatureThen;
DdNode* signatureElse;
short offset;
bool isNondeterminismVariable = false;
while (skipped && !Cudd_IsConstant(nonBlockVariablesNode)) {
// Remember an offset that indicates whether the top variable is a nondeterminism variable or not.
offset = options.shiftStateVariables ? 1 : 0;
if (!Cudd_IsConstant(nondeterminismVariablesNode) && Cudd_NodeReadIndex(nondeterminismVariablesNode) == Cudd_NodeReadIndex(nonBlockVariablesNode)) {
offset = 0;
isNondeterminismVariable = true;
}
if (Cudd_NodeReadIndex(signatureNode) == Cudd_NodeReadIndex(nonBlockVariablesNode)) {
signatureThen = Cudd_T(signatureNode);
signatureElse = Cudd_E(signatureNode);
skipped = false;
} else {
signatureThen = signatureElse = signatureNode;
}
// If we skipped the next variable, we fast-forward.
if (skipped) {
// If the current variable is a nondeterminism variable, we need to advance both variable sets otherwise just the non-block variables.
nonBlockVariablesNode = Cudd_T(nonBlockVariablesNode);
if (isNondeterminismVariable) {
nondeterminismVariablesNode = Cudd_T(nondeterminismVariablesNode);
}
}
}
// If there are no more non-block variables remaining, make a recursive call to enter the base case.
if (Cudd_IsConstant(nonBlockVariablesNode)) {
return refineReuseSignatureResults(signatureNode, nondeterminismVariablesNode, nonBlockVariablesNode);
}
DdNode* thenResult = refineReuseSignatureResults(signatureThen, isNondeterminismVariable ? Cudd_T(nondeterminismVariablesNode) : nondeterminismVariablesNode, Cudd_T(nonBlockVariablesNode));
Cudd_Ref(thenResult);
DdNode* elseResult = refineReuseSignatureResults(signatureElse, isNondeterminismVariable ? Cudd_T(nondeterminismVariablesNode) : nondeterminismVariablesNode, Cudd_T(nonBlockVariablesNode));
Cudd_Ref(elseResult);
DdNode* result;
if (thenResult == elseResult) {
Cudd_Deref(thenResult);
Cudd_Deref(elseResult);
result = thenResult;
} else {
// Get the node to connect the subresults.
bool complemented = Cudd_IsComplement(thenResult);
result = cuddUniqueInter(ddman, Cudd_NodeReadIndex(nonBlockVariablesNode) + offset, Cudd_Regular(thenResult), complemented ? Cudd_Not(elseResult) : elseResult);
if (complemented) {
result = Cudd_Not(result);
if (options.reuseBlockNumbers) {
// If this is the first time (in this traversal) that we encounter this signature, we check
// whether we can assign the old block number to it.
auto& reuseEntry = reuseBlocksCache[partitionNode];
if (!reuseEntry.isReused()) {
reuseEntry.setReused();
signatureCache[nodePair] = partitionNode;
return partitionNode;
}
Cudd_Deref(thenResult);
Cudd_Deref(elseResult);
}
// Store the result in the cache.
signatureCache[signatureNode] = result;
DdNode* result = encodeBlock(nextFreeBlockIndex++);
signatureCache[nodePair] = result;
return result;
}
}
DdNodePtr refineReuseBlockNumber(DdNode* partitionNode, DdNode* signatureNode, DdNode* nondeterminismVariablesNode, DdNode* nonBlockVariablesNode) {
// If we arrived at the constant zero node, then this was an illegal state encoding (we require
// all states to be non-deadlock).
if (partitionNode == Cudd_ReadZero(ddman)) {
return partitionNode;
}
// Check the cache whether we have seen the same node before.
auto nodePair = std::make_pair(signatureNode, partitionNode);
auto it = signatureCache2.find(nodePair);
if (it != signatureCache2.end()) {
// If so, we return the corresponding result.
return it->second;
}
// If there are no more non-block variables, we hit the signature.
if (Cudd_IsConstant(nonBlockVariablesNode)) {
// If this is the first time (in this traversal) that we encounter this signature, we check
// whether we can assign the old block number to it.
auto& reuseEntry = reuseBlocksCache[partitionNode];
if (!reuseEntry.isReused()) {
reuseEntry.setReused();
signatureCache2[nodePair] = partitionNode;
return partitionNode;
} else {
DdNode* result = encodeBlock(nextFreeBlockIndex++);
signatureCache2[nodePair] = result;
return result;
}
} else {
// If there are more variables that belong to the non-block part of the encoding, we need to recursively descend.
@ -335,12 +208,12 @@ namespace storm {
// If there are no more non-block variables remaining, make a recursive call to enter the base case.
if (Cudd_IsConstant(nonBlockVariablesNode)) {
return refineReuseBlockNumber(partitionNode, signatureNode, nondeterminismVariablesNode, nonBlockVariablesNode);
return refine(partitionNode, signatureNode, nondeterminismVariablesNode, nonBlockVariablesNode);
}
DdNode* thenResult = refineReuseBlockNumber(partitionThen, signatureThen, isNondeterminismVariable ? Cudd_T(nondeterminismVariablesNode) : nondeterminismVariablesNode, Cudd_T(nonBlockVariablesNode));
DdNode* thenResult = refine(partitionThen, signatureThen, isNondeterminismVariable ? Cudd_T(nondeterminismVariablesNode) : nondeterminismVariablesNode, Cudd_T(nonBlockVariablesNode));
Cudd_Ref(thenResult);
DdNode* elseResult = refineReuseBlockNumber(partitionElse, signatureElse, isNondeterminismVariable ? Cudd_T(nondeterminismVariablesNode) : nondeterminismVariablesNode, Cudd_T(nonBlockVariablesNode));
DdNode* elseResult = refine(partitionElse, signatureElse, isNondeterminismVariable ? Cudd_T(nondeterminismVariablesNode) : nondeterminismVariablesNode, Cudd_T(nonBlockVariablesNode));
Cudd_Ref(elseResult);
DdNode* result;
@ -360,8 +233,7 @@ namespace storm {
}
// Store the result in the cache.
signatureCache2[nodePair] = result;
signatureCache[nodePair] = result;
return result;
}
}
@ -394,9 +266,7 @@ namespace storm {
uint64_t lastNumberOfVisitedNodes;
// The cache used to identify states with identical signature.
spp::sparse_hash_map<DdNode const*, DdNode*> oldSignatureCache;
spp::sparse_hash_map<DdNode const*, DdNode*> signatureCache;
spp::sparse_hash_map<std::pair<DdNode const*, DdNode const*>, DdNode*, CuddPointerPairHash> signatureCache2;
spp::sparse_hash_map<std::pair<DdNode const*, DdNode const*>, DdNode*, CuddPointerPairHash> signatureCache;
// The cache used to identify which old block numbers have already been reused.
spp::sparse_hash_map<DdNode const*, ReuseWrapper> reuseBlocksCache;
@ -412,71 +282,29 @@ namespace storm {
}
Partition<storm::dd::DdType::Sylvan, ValueType> refine(Partition<storm::dd::DdType::Sylvan, ValueType> const& oldPartition, Signature<storm::dd::DdType::Sylvan, ValueType> const& signature) {
storm::dd::Bdd<storm::dd::DdType::Sylvan> newPartitionBdd;
if (options.reuseBlockNumbers && !options.reuseSignatureResult) {
newPartitionBdd = refineReuseBlockNumber(oldPartition, signature.getSignatureAdd());
} else {
newPartitionBdd = refineReuseSignatureResults(oldPartition, signature.getSignatureAdd());
}
auto start = std::chrono::high_resolution_clock::now();
uint64_t numberOfBlocks = nextFreeBlockIndex;
if (options.reuseSignatureResult) {
std::set<storm::expressions::Variable> blockVariableSet = {blockVariable};
std::set<storm::expressions::Variable> nonBlockExpressionVariables;
std::set_difference(oldPartition.asBdd().getContainedMetaVariables().begin(), oldPartition.asBdd().getContainedMetaVariables().end(), blockVariableSet.begin(), blockVariableSet.end(), std::inserter(nonBlockExpressionVariables, nonBlockExpressionVariables.begin()));
numberOfBlocks = newPartitionBdd.existsAbstract(nonBlockExpressionVariables).getNonZeroCount();
}
auto end = std::chrono::high_resolution_clock::now();
std::cout << "took " << std::chrono::duration_cast<std::chrono::milliseconds>(end - start).count() << std::endl;
return oldPartition.replacePartition(newPartitionBdd, numberOfBlocks, nextFreeBlockIndex);
storm::dd::Bdd<storm::dd::DdType::Sylvan> newPartitionBdd = refine(oldPartition, signature.getSignatureAdd());
++numberOfRefinements;
return oldPartition.replacePartition(newPartitionBdd, nextFreeBlockIndex, nextFreeBlockIndex);
}
private:
void clearCaches() {
signatureCache.clear();
signatureCache2.clear();
reuseBlocksCache.clear();
}
storm::dd::Bdd<storm::dd::DdType::Sylvan> refineReuseBlockNumber(Partition<storm::dd::DdType::Sylvan, ValueType> const& oldPartition, storm::dd::Add<storm::dd::DdType::Sylvan, ValueType> const& signatureAdd) {
STORM_LOG_ASSERT(oldPartition.storedAsBdd(), "Expecting partition to be stored as BDD for Sylvan.");
// Set up next refinement.
++numberOfRefinements;
nextFreeBlockIndex = oldPartition.getNextFreeBlockIndex();
// Perform the actual recursive refinement step.
BDD result = refineReuseBlockNumber(oldPartition.asBdd().getInternalBdd().getSylvanBdd().GetBDD(), signatureAdd.getInternalAdd().getSylvanMtbdd().GetMTBDD(), nondeterminismVariables.getInternalBdd().getSylvanBdd().GetBDD(), nonBlockVariables.getInternalBdd().getSylvanBdd().GetBDD());
// Construct resulting BDD from the obtained node and the meta information.
storm::dd::InternalBdd<storm::dd::DdType::Sylvan> internalNewPartitionBdd(&internalDdManager, sylvan::Bdd(result));
storm::dd::Bdd<storm::dd::DdType::Sylvan> newPartitionBdd(oldPartition.asBdd().getDdManager(), internalNewPartitionBdd, oldPartition.asBdd().getContainedMetaVariables());
clearCaches();
return newPartitionBdd;
}
storm::dd::Bdd<storm::dd::DdType::Sylvan> refineReuseSignatureResults(Partition<storm::dd::DdType::Sylvan, ValueType> const& oldPartition, storm::dd::Add<storm::dd::DdType::Sylvan, ValueType> const& signatureAdd) {
storm::dd::Bdd<storm::dd::DdType::Sylvan> refine(Partition<storm::dd::DdType::Sylvan, ValueType> const& oldPartition, storm::dd::Add<storm::dd::DdType::Sylvan, ValueType> const& signatureAdd) {
STORM_LOG_ASSERT(oldPartition.storedAsBdd(), "Expecting partition to be stored as BDD for Sylvan.");
// Set up next refinement.
++numberOfRefinements;
nextFreeBlockIndex = options.reuseSignatureResult ? oldPartition.getNextFreeBlockIndex() : 0;
nextFreeBlockIndex = options.reuseBlockNumbers ? oldPartition.getNextFreeBlockIndex() : 0;
// Perform the actual recursive refinement step.
BDD result = refineReuseSignatureResults(signatureAdd.getInternalAdd().getSylvanMtbdd().GetMTBDD(), nondeterminismVariables.getInternalBdd().getSylvanBdd().GetBDD(), nonBlockVariables.getInternalBdd().getSylvanBdd().GetBDD());
BDD result = refine(oldPartition.asBdd().getInternalBdd().getSylvanBdd().GetBDD(), signatureAdd.getInternalAdd().getSylvanMtbdd().GetMTBDD(), nondeterminismVariables.getInternalBdd().getSylvanBdd().GetBDD(), nonBlockVariables.getInternalBdd().getSylvanBdd().GetBDD());
// Construct resulting BDD from the obtained node and the meta information.
storm::dd::InternalBdd<storm::dd::DdType::Sylvan> internalNewPartitionBdd(&internalDdManager, sylvan::Bdd(result));
storm::dd::Bdd<storm::dd::DdType::Sylvan> newPartitionBdd(oldPartition.asBdd().getDdManager(), internalNewPartitionBdd, oldPartition.asBdd().getContainedMetaVariables());
if (options.reuseSignatureResult) {
oldSignatureCache = signatureCache;
}
clearCaches();
return newPartitionBdd;
}
@ -490,101 +318,7 @@ namespace storm {
return sylvan_cube(blockCube.getInternalBdd().getSylvanBdd().GetBDD(), e.data());
}
BDD refineReuseSignatureResults(MTBDD signatureNode, BDD nondeterminismVariablesNode, BDD nonBlockVariablesNode) {
LACE_ME;
// If we arrived at the constant zero node, then this was an illegal state encoding (we require
// all states to be non-deadlock).
if (mtbdd_iszero(signatureNode)) {
return sylvan_false;
}
// Check the cache whether we have seen the same node before.
auto it = signatureCache.find(signatureNode);
if (it != signatureCache.end()) {
// If so, we return the corresponding result.
return it->second;
}
// If we are to reuse signature results, check the old cache.
if (options.reuseSignatureResult) {
it = oldSignatureCache.find(signatureNode);
if (it != oldSignatureCache.end()) {
// If so, we return the corresponding result.
return it->second;
}
}
sylvan_gc_test();
// If there are no more non-block variables, we hit the signature.
if (sylvan_isconst(nonBlockVariablesNode)) {
BDD result = encodeBlock(nextFreeBlockIndex++);
signatureCache[signatureNode] = result;
return result;
} else {
// If there are more variables that belong to the non-block part of the encoding, we need to recursively descend.
bool skipped = true;
MTBDD signatureThen;
MTBDD signatureElse;
short offset;
bool isNondeterminismVariable = false;
while (skipped && !sylvan_isconst(nonBlockVariablesNode)) {
// Remember an offset that indicates whether the top variable is a nondeterminism variable or not.
offset = options.shiftStateVariables ? 1 : 0;
if (!sylvan_isconst(nondeterminismVariablesNode) && sylvan_var(nondeterminismVariablesNode) == sylvan_var(nonBlockVariablesNode)) {
offset = 0;
isNondeterminismVariable = true;
}
if (storm::dd::InternalAdd<storm::dd::DdType::Sylvan, ValueType>::matchesVariableIndex(signatureNode, sylvan_var(nonBlockVariablesNode))) {
signatureThen = sylvan_high(signatureNode);
signatureElse = sylvan_low(signatureNode);
skipped = false;
} else {
signatureThen = signatureElse = signatureNode;
}
// If we skipped the next variable, we fast-forward.
if (skipped) {
// If the current variable is a nondeterminism variable, we need to advance both variable sets otherwise just the non-block variables.
nonBlockVariablesNode = sylvan_high(nonBlockVariablesNode);
if (isNondeterminismVariable) {
nondeterminismVariablesNode = sylvan_high(nondeterminismVariablesNode);
}
}
}
// If there are no more non-block variables remaining, make a recursive call to enter the base case.
if (sylvan_isconst(nonBlockVariablesNode)) {
return refineReuseSignatureResults(signatureNode, nondeterminismVariablesNode, nonBlockVariablesNode);
}
BDD thenResult = refineReuseSignatureResults(signatureThen, isNondeterminismVariable ? sylvan_high(nondeterminismVariablesNode) : nondeterminismVariablesNode, sylvan_high(nonBlockVariablesNode));
bdd_refs_push(thenResult);
BDD elseResult = refineReuseSignatureResults(signatureElse, isNondeterminismVariable ? sylvan_high(nondeterminismVariablesNode) : nondeterminismVariablesNode, sylvan_high(nonBlockVariablesNode));
bdd_refs_push(elseResult);
BDD result;
if (thenResult == elseResult) {
result = thenResult;
} else {
// Get the node to connect the subresults.
result = sylvan_makenode(sylvan_var(nonBlockVariablesNode) + offset, elseResult, thenResult);
}
// Dispose of the intermediate results.
bdd_refs_pop(2);
// Store the result in the cache.
signatureCache[signatureNode] = result;
return result;
}
}
BDD refineReuseBlockNumber(BDD partitionNode, MTBDD signatureNode, BDD nondeterminismVariablesNode, BDD nonBlockVariablesNode) {
BDD refine(BDD partitionNode, MTBDD signatureNode, BDD nondeterminismVariablesNode, BDD nonBlockVariablesNode) {
LACE_ME;
// If we arrived at the constant zero node, then this was an illegal state encoding (we require
@ -597,8 +331,8 @@ namespace storm {
// Check the cache whether we have seen the same node before.
auto nodePair = std::make_pair(signatureNode, partitionNode);
auto it = signatureCache2.find(nodePair);
if (it != signatureCache2.end()) {
auto it = signatureCache.find(nodePair);
if (it != signatureCache.end()) {
// If so, we return the corresponding result.
return it->second;
}
@ -607,20 +341,22 @@ namespace storm {
// If there are no more non-block variables, we hit the signature.
if (sylvan_isconst(nonBlockVariablesNode)) {
// If this is the first time (in this traversal) that we encounter this signature, we check
// whether we can assign the old block number to it.
auto& reuseBlockEntry = reuseBlocksCache[partitionNode];
if (!reuseBlockEntry.isReused()) {
reuseBlockEntry.setReused();
reuseBlocksCache.emplace(partitionNode, true);
signatureCache2[nodePair] = partitionNode;
return partitionNode;
} else {
BDD result = encodeBlock(nextFreeBlockIndex++);
signatureCache2[nodePair] = result;
return result;
if (options.reuseBlockNumbers) {
// If this is the first time (in this traversal) that we encounter this signature, we check
// whether we can assign the old block number to it.
auto& reuseBlockEntry = reuseBlocksCache[partitionNode];
if (!reuseBlockEntry.isReused()) {
reuseBlockEntry.setReused();
reuseBlocksCache.emplace(partitionNode, true);
signatureCache[nodePair] = partitionNode;
return partitionNode;
}
}
BDD result = encodeBlock(nextFreeBlockIndex++);
signatureCache[nodePair] = result;
return result;
} else {
// If there are more variables that belong to the non-block part of the encoding, we need to recursively descend.
@ -667,12 +403,12 @@ namespace storm {
// If there are no more non-block variables remaining, make a recursive call to enter the base case.
if (sylvan_isconst(nonBlockVariablesNode)) {
return refineReuseBlockNumber(partitionNode, signatureNode, nondeterminismVariablesNode, nonBlockVariablesNode);
return refine(partitionNode, signatureNode, nondeterminismVariablesNode, nonBlockVariablesNode);
}
BDD thenResult = refineReuseBlockNumber(partitionThen, signatureThen, isNondeterminismVariable ? sylvan_high(nondeterminismVariablesNode) : nondeterminismVariablesNode, sylvan_high(nonBlockVariablesNode));
BDD thenResult = refine(partitionThen, signatureThen, isNondeterminismVariable ? sylvan_high(nondeterminismVariablesNode) : nondeterminismVariablesNode, sylvan_high(nonBlockVariablesNode));
bdd_refs_push(thenResult);
BDD elseResult = refineReuseBlockNumber(partitionElse, signatureElse, isNondeterminismVariable ? sylvan_high(nondeterminismVariablesNode) : nondeterminismVariablesNode, sylvan_high(nonBlockVariablesNode));
BDD elseResult = refine(partitionElse, signatureElse, isNondeterminismVariable ? sylvan_high(nondeterminismVariablesNode) : nondeterminismVariablesNode, sylvan_high(nonBlockVariablesNode));
bdd_refs_push(elseResult);
BDD result;
@ -687,7 +423,7 @@ namespace storm {
bdd_refs_pop(2);
// Store the result in the cache.
signatureCache2[nodePair] = result;
signatureCache[nodePair] = result;
return result;
}
@ -714,9 +450,7 @@ namespace storm {
uint64_t numberOfRefinements;
// The cache used to identify states with identical signature.
spp::sparse_hash_map<MTBDD, MTBDD> oldSignatureCache;
spp::sparse_hash_map<MTBDD, MTBDD> signatureCache;
spp::sparse_hash_map<std::pair<MTBDD, MTBDD>, MTBDD, SylvanMTBDDPairHash> signatureCache2;
spp::sparse_hash_map<std::pair<MTBDD, MTBDD>, MTBDD, SylvanMTBDDPairHash> signatureCache;
// The cache used to identify which old block numbers have already been reused.
spp::sparse_hash_map<MTBDD, ReuseWrapper> reuseBlocksCache;

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