From 22df6e9e8618614e8c33700c55705266912500ae Mon Sep 17 00:00:00 2001 From: Tim King Date: Mon, 25 Nov 2013 18:36:06 -0500 Subject: [PATCH] Substantial Changes: -ITE Simplification -- Moved the utilities in src/theory/ite_simplifier.{h,cpp} to ite_utilities. -- Separated simpWithCare from simpITE. -- Disabled ite simplification on repeat simplification by default. Currently, ite simplification cannot help unless we internally make new constant leaf ites equal to constants. -- simplifyWithCare() is now only run on QF_AUFBV by default. Speeds up nec benchmarks dramatically. -- Added a new compress ites pass that is only run on QF_LIA by default. This targets the perverse structure of ites generated during ite simplification on nec benchmarks. -- After ite simplification, if the ite simplifier was used many times and the NodeManager's node pool is large enough, this garbage collects: zombies from the NodeManager repeatedly, the ite simplification caches, and the theory rewrite caches. - TheoryEngine -- Added TheoryEngine::donePPSimpITE() which orchestrates a number of ite simplifications above. -- Switched UnconstrainedSimplifier to a pointer. - RemoveITEs -- Added a heuristic for checking whether or not a node contains term ites and if not, not bothering to invoke the rest of RemoveITE::run(). This safely changes the type of the cache used on misses of run. This cache can be cleared in the future. Currently disabled pending additional testing. - TypeChecker -- added a neverIsConst() rule to the typechecker. Operators that cannot be used in constructing constant expressions by computeIsConst() can now avoid caching on Node::isConst() calls. - Theory Bool Rewriter -- Added additional simplifications for boolean ites. Minor Changes: - TheoryModel -- Removed vestigial copy of the ITESimplifier. - AttributeManager -- Fixed a garbage collection bug when deleting the node table caused the NodeManager to reclaimZombies() which caused memory corruption by deleting from the attributeManager. - TypeChecker -- added a neverIsConst() rule to the typechecker. Operators that cannot be used in constructing constant expressions by computeIsConst() can now avoid caching on Node::isConst() calls. -NodeManager -- Added additional functions for reclaiming zombies. -- Exposed the size of the node pool for heuristics that worry about memory consumption. - NaryBuilder -- Added convenience classes for constructing associative and commutative n-ary operators. -- Added a pass that turns associative and commutative n-ary operators into binary operators. (Mostly for printing expressions for strict parsers.) --- src/Makefile.am | 4 +- src/expr/attribute.cpp | 14 + src/expr/attribute.h | 28 +- src/expr/mkexpr | 8 + src/expr/node.cpp | 4 + src/expr/node_manager.cpp | 24 + src/expr/node_manager.h | 18 +- src/expr/options | 3 + src/expr/type_checker.h | 3 + src/expr/type_checker_template.cpp | 17 + src/smt/options | 13 + src/smt/smt_engine.cpp | 129 +- src/theory/booleans/theory_bool_rewriter.cpp | 118 +- src/theory/booleans/theory_bool_rewriter.h | 4 +- src/theory/ite_simplifier.cpp | 501 ------ src/theory/ite_simplifier.h | 165 -- src/theory/ite_utilities.cpp | 1613 ++++++++++++++++++ src/theory/ite_utilities.h | 373 ++++ src/theory/model.h | 2 - src/theory/theory_engine.cpp | 62 +- src/theory/theory_engine.h | 23 +- src/theory/unconstrained_simplifier.cpp | 1 + src/theory/unconstrained_simplifier.h | 5 +- src/util/Makefile.am | 2 + src/util/ite_removal.cpp | 57 +- src/util/ite_removal.h | 29 +- src/util/nary_builder.cpp | 183 ++ src/util/nary_builder.h | 38 + test/regress/regress0/arith/Makefile.am | 3 +- test/regress/regress0/arith/prp-13-24.smt2 | 47 + 30 files changed, 2746 insertions(+), 745 deletions(-) delete mode 100644 src/theory/ite_simplifier.cpp delete mode 100644 src/theory/ite_simplifier.h create mode 100644 src/theory/ite_utilities.cpp create mode 100644 src/theory/ite_utilities.h create mode 100644 src/util/nary_builder.cpp create mode 100644 src/util/nary_builder.h create mode 100644 test/regress/regress0/arith/prp-13-24.smt2 diff --git a/src/Makefile.am b/src/Makefile.am index 1858d4d32..d6a0ffe0a 100644 --- a/src/Makefile.am +++ b/src/Makefile.am @@ -142,8 +142,8 @@ libcvc4_la_SOURCES = \ theory/shared_terms_database.cpp \ theory/term_registration_visitor.h \ theory/term_registration_visitor.cpp \ - theory/ite_simplifier.h \ - theory/ite_simplifier.cpp \ + theory/ite_utilities.h \ + theory/ite_utilities.cpp \ theory/unconstrained_simplifier.h \ theory/unconstrained_simplifier.cpp \ theory/quantifiers_engine.h \ diff --git a/src/expr/attribute.cpp b/src/expr/attribute.cpp index 92a21546c..056e68c69 100644 --- a/src/expr/attribute.cpp +++ b/src/expr/attribute.cpp @@ -26,6 +26,19 @@ namespace CVC4 { namespace expr { namespace attr { +AttributeManager::AttributeManager(context::Context* ctxt) : + d_cdbools(ctxt), + d_cdints(ctxt), + d_cdtnodes(ctxt), + d_cdnodes(ctxt), + d_cdstrings(ctxt), + d_cdptrs(ctxt), + d_inGarbageCollection(false) +{} + +bool AttributeManager::inGarbageCollection() const { + return d_inGarbageCollection; +} void AttributeManager::debugHook(int debugFlag) { /* DO NOT CHECK IN ANY CODE INTO THE DEBUG HOOKS! @@ -36,6 +49,7 @@ void AttributeManager::debugHook(int debugFlag) { } void AttributeManager::deleteAllAttributes(NodeValue* nv) { + Assert(!inGarbageCollection()); d_bools.erase(nv); deleteFromTable(d_ints, nv); deleteFromTable(d_tnodes, nv); diff --git a/src/expr/attribute.h b/src/expr/attribute.h index 605427190..1e3f25461 100644 --- a/src/expr/attribute.h +++ b/src/expr/attribute.h @@ -101,17 +101,14 @@ class AttributeManager { template friend struct getTable; + bool d_inGarbageCollection; + + void clearDeleteAllAttributesBuffer(); + public: /** Construct an attribute manager. */ - AttributeManager(context::Context* ctxt) : - d_cdbools(ctxt), - d_cdints(ctxt), - d_cdtnodes(ctxt), - d_cdnodes(ctxt), - d_cdstrings(ctxt), - d_cdptrs(ctxt) { - } + AttributeManager(context::Context* ctxt); /** * Get a particular attribute on a particular node. @@ -177,6 +174,10 @@ public: */ void deleteAllAttributes(); + /** + * Returns true if a table is currently being deleted. + */ + bool inGarbageCollection() const ; /** * Determines the AttrTableId of an attribute. @@ -563,6 +564,8 @@ AttributeManager::setAttribute(NodeValue* nv, /** * Search for the NodeValue in all attribute tables and remove it, * calling the cleanup function if one is defined. + * + * This cannot use nv as anything other than a pointer! */ template inline void AttributeManager::deleteFromTable(AttrHash& table, @@ -600,6 +603,9 @@ inline void AttributeManager::deleteFromTable(CDAttrHash& table, */ template inline void AttributeManager::deleteAllFromTable(AttrHash& table) { + Assert(!d_inGarbageCollection); + d_inGarbageCollection = true; + bool anyRequireClearing = false; typedef AttributeTraits traits_t; typedef AttrHash hash_t; @@ -627,6 +633,8 @@ inline void AttributeManager::deleteAllFromTable(AttrHash& table) { } } table.clear(); + d_inGarbageCollection = false; + Assert(!d_inGarbageCollection); } template @@ -639,6 +647,7 @@ AttributeUniqueId AttributeManager::getAttributeId(const AttrKind& attr){ template void AttributeManager::deleteAttributesFromTable(AttrHash& table, const std::vector& ids){ + d_inGarbageCollection = true; typedef AttributeTraits traits_t; typedef AttrHash hash_t; @@ -664,6 +673,7 @@ void AttributeManager::deleteAttributesFromTable(AttrHash& table, const std:: ++it; } } + d_inGarbageCollection = false; static const size_t ReconstructShrinkRatio = 8; if(initialSize/ReconstructShrinkRatio > table.size()){ reconstructTable(table); @@ -672,10 +682,12 @@ void AttributeManager::deleteAttributesFromTable(AttrHash& table, const std:: template void AttributeManager::reconstructTable(AttrHash& table){ + d_inGarbageCollection = true; typedef AttrHash hash_t; hash_t cpy; cpy.insert(table.begin(), table.end()); cpy.swap(table); + d_inGarbageCollection = false; } diff --git a/src/expr/mkexpr b/src/expr/mkexpr index 8c94db3cc..9e7a2596f 100755 --- a/src/expr/mkexpr +++ b/src/expr/mkexpr @@ -65,6 +65,7 @@ exportConstant_cases= typerules= construles= +neverconstrules= seen_theory=false seen_theory_builtin=false @@ -167,6 +168,12 @@ function construle { case kind::$1: #line $lineno \"$kf\" return $2::computeIsConst(nodeManager, n); +" + neverconstrules="${neverconstrules} +#line $lineno \"$kf\" + case kind::$1: +#line $lineno \"$kf\" + return false; " } @@ -294,6 +301,7 @@ for var in \ typechecker_includes \ typerules \ construles \ + neverconstrules \ ; do eval text="\${text//\\\$\\{$var\\}/\${$var}}" done diff --git a/src/expr/node.cpp b/src/expr/node.cpp index b1614f31b..39bbfbc2e 100644 --- a/src/expr/node.cpp +++ b/src/expr/node.cpp @@ -73,6 +73,10 @@ bool NodeTemplate::isConst() const { Debug("isConst") << "Node::isConst() returning false, it's a VARIABLE" << std::endl; return false; default: + if(expr::TypeChecker::neverIsConst(NodeManager::currentNM(), *this)){ + Debug("isConst") << "Node::isConst() returning false, the kind is never const" << std::endl; + return false; + } if(getAttribute(IsConstComputedAttr())) { bool bval = getAttribute(IsConstAttr()); Debug("isConst") << "Node::isConst() returning cached value " << (bval ? "true" : "false") << " for: " << *this << std::endl; diff --git a/src/expr/node_manager.cpp b/src/expr/node_manager.cpp index cede6ff1f..9c76a41f3 100644 --- a/src/expr/node_manager.cpp +++ b/src/expr/node_manager.cpp @@ -134,6 +134,7 @@ NodeManager::~NodeManager() { d_operators[i] = Node::null(); } + Assert(!d_attrManager->inGarbageCollection() ); while(!d_zombies.empty()) { reclaimZombies(); } @@ -161,6 +162,7 @@ NodeManager::~NodeManager() { void NodeManager::reclaimZombies() { // FIXME multithreading + Assert(!d_attrManager->inGarbageCollection()); Debug("gc") << "reclaiming " << d_zombies.size() << " zombie(s)!\n"; @@ -435,6 +437,23 @@ TypeNode NodeManager::getDatatypeForTupleRecord(TypeNode t) { return dtt; } +void NodeManager::reclaimAllZombies(){ + reclaimZombiesUntil(0u); +} + +/** Reclaim zombies while there are more than k nodes in the pool (if possible).*/ +void NodeManager::reclaimZombiesUntil(uint32_t k){ + if(safeToReclaimZombies()){ + while(poolSize() >= k && !d_zombies.empty()){ + reclaimZombies(); + } + } +} + +size_t NodeManager::poolSize() const{ + return d_nodeValuePool.size(); +} + TypeNode NodeManager::mkSort(uint32_t flags) { NodeBuilder<1> nb(this, kind::SORT_TYPE); Node sortTag = NodeBuilder<0>(this, kind::SORT_TAG); @@ -586,6 +605,11 @@ Node NodeManager::mkAbstractValue(const TypeNode& type) { return n; } +bool NodeManager::safeToReclaimZombies() const{ + // FIXME multithreading + return !d_inReclaimZombies && !d_attrManager->inGarbageCollection(); +} + void NodeManager::deleteAttributes(const std::vector& ids){ d_attrManager->deleteAttributes(ids); } diff --git a/src/expr/node_manager.h b/src/expr/node_manager.h index 32c492003..af771bd89 100644 --- a/src/expr/node_manager.h +++ b/src/expr/node_manager.h @@ -229,8 +229,7 @@ class NodeManager { } d_zombies.insert(nv);// FIXME multithreading - if(!d_inReclaimZombies) {// FIXME multithreading - // for now, collect eagerly. can add heuristic here later.. + if(safeToReclaimZombies()) { if(d_zombies.size() > 5000) { reclaimZombies(); } @@ -242,6 +241,11 @@ class NodeManager { */ void reclaimZombies(); + /** + * It is safe to collect zombies. + */ + bool safeToReclaimZombies() const; + /** * This template gives a mechanism to stack-allocate a NodeValue * with enough space for N children (where N is a compile-time @@ -860,6 +864,15 @@ public: */ static inline TypeNode fromType(Type t); + /** Reclaim zombies while there are more than k nodes in the pool (if possible).*/ + void reclaimZombiesUntil(uint32_t k); + + /** Reclaims all zombies (if possible).*/ + void reclaimAllZombies(); + + /** Size of the node pool. */ + size_t poolSize() const; + /** Deletes a list of attributes from the NM's AttributeManager.*/ void deleteAttributes(const std::vector< const expr::attr::AttributeUniqueId* >& ids); @@ -871,7 +884,6 @@ public: * any published code! */ void debugHook(int debugFlag); - };/* class NodeManager */ /** diff --git a/src/expr/options b/src/expr/options index 223189d1b..cf893a7a5 100644 --- a/src/expr/options +++ b/src/expr/options @@ -21,5 +21,8 @@ option earlyTypeChecking --eager-type-checking/--lazy-type-checking bool :defaul option typeChecking /--no-type-checking bool :default DO_SEMANTIC_CHECKS_BY_DEFAULT :link /--lazy-type-checking never type check expressions +option biasedITERemoval --biased-ites bool :default false + try the new remove ite pass that is biased against term ites appearing + endmodule diff --git a/src/expr/type_checker.h b/src/expr/type_checker.h index ac461bb7b..d34a7c7d6 100644 --- a/src/expr/type_checker.h +++ b/src/expr/type_checker.h @@ -34,6 +34,9 @@ public: static bool computeIsConst(NodeManager* nodeManager, TNode n) throw (AssertionException); + static bool neverIsConst(NodeManager* nodeManager, TNode n) + throw (AssertionException); + };/* class TypeChecker */ }/* CVC4::expr namespace */ diff --git a/src/expr/type_checker_template.cpp b/src/expr/type_checker_template.cpp index b2138c9a1..4e476f4d9 100644 --- a/src/expr/type_checker_template.cpp +++ b/src/expr/type_checker_template.cpp @@ -78,5 +78,22 @@ ${construles} }/* TypeChecker::computeIsConst */ +bool TypeChecker::neverIsConst(NodeManager* nodeManager, TNode n) + throw (AssertionException) { + + Assert(n.getMetaKind() == kind::metakind::OPERATOR || n.getMetaKind() == kind::metakind::PARAMETERIZED); + + switch(n.getKind()) { +${neverconstrules} + +#line 90 "${template}" + + default:; + } + + return true; + +}/* TypeChecker::neverIsConst */ + }/* CVC4::expr namespace */ }/* CVC4 namespace */ diff --git a/src/smt/options b/src/smt/options index d2455b520..6b9944cdd 100644 --- a/src/smt/options +++ b/src/smt/options @@ -42,18 +42,31 @@ common-option interactive interactive-mode --interactive bool :read-write option doITESimp --ite-simp bool :read-write turn on ite simplification (Kim (and Somenzi) et al., SAT 2009) +option doITESimpOnRepeat --on-repeat-ite-simp bool :read-write :default false + do the ite simplification pass again if repeating simplification + +option simplifyWithCareEnabled --simp-with-care bool :default false :read-write + enables simplifyWithCare in ite simplificiation + +option compressItes --simp-ite-compress bool :default false :read-write + enables compressing ites after ite simplification + option unconstrainedSimp --unconstrained-simp bool :default false :read-write turn on unconstrained simplification (see Bruttomesso/Brummayer PhD thesis) option repeatSimp --repeat-simp bool :read-write make multiple passes with nonclausal simplifier +option zombieHuntThreshold --simp-ite-hunt-zombies uint32_t :default 524288 + post ite compression enables zombie removal while the number of nodes is above this threshold + option sortInference --sort-inference bool :read-write :default false calculate sort inference of input problem, convert the input based on monotonic sorts common-option incrementalSolving incremental -i --incremental bool enable incremental solving + option abstractValues abstract-values --abstract-values bool :default false in models, output arrays (and in future, maybe others) using abstract values, as required by the SMT-LIB standard option modelUninterpDtEnum --model-u-dt-enum bool :default false diff --git a/src/smt/smt_engine.cpp b/src/smt/smt_engine.cpp index 21f2d9209..2cc606fa9 100644 --- a/src/smt/smt_engine.cpp +++ b/src/smt/smt_engine.cpp @@ -52,6 +52,7 @@ #include "util/node_visitor.h" #include "util/configuration.h" #include "util/exception.h" +#include "util/nary_builder.h" #include "smt/command_list.h" #include "smt/boolean_terms.h" #include "smt/options.h" @@ -90,6 +91,19 @@ namespace CVC4 { namespace smt { +/** Useful for counting the number of recursive calls. */ +class ScopeCounter { +private: + unsigned& d_depth; +public: + ScopeCounter(unsigned& d) : d_depth(d) { + ++d_depth; + } + ~ScopeCounter(){ + --d_depth; + } +}; + /** * Representation of a defined function. We keep these around in * SmtEngine to permit expanding definitions late (and lazily), to @@ -150,6 +164,9 @@ struct SmtEngineStatistics { /** time spent in processAssertions() */ TimerStat d_processAssertionsTime; + /** Has something simplified to false? */ + IntStat d_simplifiedToFalse; + SmtEngineStatistics() : d_definitionExpansionTime("smt::SmtEngine::definitionExpansionTime"), d_rewriteBooleanTermsTime("smt::SmtEngine::rewriteBooleanTermsTime"), @@ -168,7 +185,10 @@ struct SmtEngineStatistics { d_checkModelTime("smt::SmtEngine::checkModelTime"), d_solveTime("smt::SmtEngine::solveTime"), d_pushPopTime("smt::SmtEngine::pushPopTime"), - d_processAssertionsTime("smt::SmtEngine::processAssertionsTime") { + d_processAssertionsTime("smt::SmtEngine::processAssertionsTime"), + d_simplifiedToFalse("smt::SmtEngine::simplifiedToFalse", 0) + + { StatisticsRegistry::registerStat(&d_definitionExpansionTime); StatisticsRegistry::registerStat(&d_rewriteBooleanTermsTime); @@ -188,6 +208,7 @@ struct SmtEngineStatistics { StatisticsRegistry::registerStat(&d_solveTime); StatisticsRegistry::registerStat(&d_pushPopTime); StatisticsRegistry::registerStat(&d_processAssertionsTime); + StatisticsRegistry::registerStat(&d_simplifiedToFalse); } ~SmtEngineStatistics() { @@ -209,6 +230,7 @@ struct SmtEngineStatistics { StatisticsRegistry::unregisterStat(&d_solveTime); StatisticsRegistry::unregisterStat(&d_pushPopTime); StatisticsRegistry::unregisterStat(&d_processAssertionsTime); + StatisticsRegistry::unregisterStat(&d_simplifiedToFalse); } };/* struct SmtEngineStatistics */ @@ -305,6 +327,10 @@ class SmtEnginePrivate : public NodeManagerListener { */ Node d_modZero; + /** Number of calls of simplify assertions active. + */ + unsigned d_simplifyAssertionsDepth; + public: /** * Map from skolem variables to index in d_assertionsToCheck containing @@ -353,11 +379,15 @@ private: void bvToBool(); // Simplify ITE structure - void simpITE(); + bool simpITE(); // Simplify based on unconstrained values void unconstrainedSimp(); + // Ensures the assertions asserted after before now + // effectively come before d_realAssertionsEnd + void compressBeforeRealAssertions(size_t before); + /** * Any variable in an assertion that is declared as a subtype type * (predicate subtype or integer subrange type) must be constrained @@ -402,6 +432,7 @@ public: d_divByZero(), d_intDivByZero(), d_modZero(), + d_simplifyAssertionsDepth(0), d_iteSkolemMap(), d_iteRemover(smt.d_userContext), d_topLevelSubstitutions(smt.d_userContext) @@ -869,12 +900,41 @@ void SmtEngine::setLogicInternal() throw() { } // Turn on ite simplification for QF_LIA and QF_AUFBV if(! options::doITESimp.wasSetByUser()) { - bool iteSimp = !d_logic.isQuantified() && - ((d_logic.isPure(THEORY_ARITH) && d_logic.isLinear() && !d_logic.isDifferenceLogic() && !d_logic.areRealsUsed()) || - (d_logic.isTheoryEnabled(THEORY_ARRAY) && d_logic.isTheoryEnabled(THEORY_UF) && d_logic.isTheoryEnabled(THEORY_BV))); + bool qf_aufbv = !d_logic.isQuantified() && + d_logic.isTheoryEnabled(THEORY_ARRAY) && + d_logic.isTheoryEnabled(THEORY_UF) && + d_logic.isTheoryEnabled(THEORY_BV); + bool qf_lia = !d_logic.isQuantified() && + d_logic.isPure(THEORY_ARITH) && + d_logic.isLinear() && + !d_logic.isDifferenceLogic() && + !d_logic.areRealsUsed(); + + bool iteSimp = (qf_aufbv || qf_lia); Trace("smt") << "setting ite simplification to " << iteSimp << endl; options::doITESimp.set(iteSimp); } + if(! options::compressItes.wasSetByUser() ){ + bool qf_lia = !d_logic.isQuantified() && + d_logic.isPure(THEORY_ARITH) && + d_logic.isLinear() && + !d_logic.isDifferenceLogic() && + !d_logic.areRealsUsed(); + + bool compressIte = qf_lia; + Trace("smt") << "setting ite compression to " << compressIte << endl; + options::compressItes.set(compressIte); + } + if(! options::simplifyWithCareEnabled.wasSetByUser() ){ + bool qf_aufbv = !d_logic.isQuantified() && + d_logic.isTheoryEnabled(THEORY_ARRAY) && + d_logic.isTheoryEnabled(THEORY_UF) && + d_logic.isTheoryEnabled(THEORY_BV); + + bool withCare = qf_aufbv; + Trace("smt") << "setting ite simplify with care to " << withCare << endl; + options::simplifyWithCareEnabled.set(withCare); + } // Turn off array eager index splitting for QF_AUFLIA if(! options::arraysEagerIndexSplitting.wasSetByUser()) { if (not d_logic.isQuantified() && @@ -2031,16 +2091,56 @@ void SmtEnginePrivate::bvToBool() { } } -void SmtEnginePrivate::simpITE() { +bool SmtEnginePrivate::simpITE() { TimerStat::CodeTimer simpITETimer(d_smt.d_stats->d_simpITETime); Trace("simplify") << "SmtEnginePrivate::simpITE()" << endl; + unsigned numAssertionOnEntry = d_assertionsToCheck.size(); for (unsigned i = 0; i < d_assertionsToCheck.size(); ++i) { - d_assertionsToCheck[i] = d_smt.d_theoryEngine->ppSimpITE(d_assertionsToCheck[i]); + Node result = d_smt.d_theoryEngine->ppSimpITE(d_assertionsToCheck[i]); + d_assertionsToCheck[i] = result; + if(result.isConst() && !result.getConst()){ + return false; + } } + bool result = d_smt.d_theoryEngine->donePPSimpITE(d_assertionsToCheck); + if(numAssertionOnEntry < d_assertionsToCheck.size()){ + compressBeforeRealAssertions(numAssertionOnEntry); + } + return result; } +void SmtEnginePrivate::compressBeforeRealAssertions(size_t before){ + size_t curr = d_assertionsToCheck.size(); + if(before >= curr || + d_realAssertionsEnd <= 0 || + d_realAssertionsEnd >= curr){ + return; + } + + // assertions + // original: [0 ... d_realAssertionsEnd) + // can be modified + // ites skolems [d_realAssertionsEnd, before) + // cannot be moved + // added [before, curr) + // can be modified + Assert(0 < d_realAssertionsEnd); + Assert(d_realAssertionsEnd <= before); + Assert(before < curr); + + std::vector intoConjunction; + for(size_t i = before; id_unconstrainedSimpTime); @@ -2490,11 +2590,13 @@ void SmtEnginePrivate::doMiplibTrick() { d_realAssertionsEnd = d_assertionsToCheck.size(); } + // returns false if simplification led to "false" bool SmtEnginePrivate::simplifyAssertions() throw(TypeCheckingException, LogicException) { Assert(d_smt.d_pendingPops == 0); try { + ScopeCounter depth(d_simplifyAssertionsDepth); Trace("simplify") << "SmtEnginePrivate::simplify()" << endl; @@ -2560,9 +2662,14 @@ bool SmtEnginePrivate::simplifyAssertions() Debug("smt") << " d_assertionsToCheck : " << d_assertionsToCheck.size() << endl; // ITE simplification - if(options::doITESimp()) { + if(options::doITESimp() && + (d_simplifyAssertionsDepth <= 1 || options::doITESimpOnRepeat())) { Chat() << "...doing ITE simplification..." << endl; - simpITE(); + bool noConflict = simpITE(); + if(!noConflict){ + Chat() << "...ITE simplification found unsat..." << endl; + return false; + } } dumpAssertions("post-itesimp", d_assertionsToCheck); @@ -2916,6 +3023,9 @@ void SmtEnginePrivate::processAssertions() { dumpAssertions("pre-simplify", d_assertionsToPreprocess); Chat() << "simplifying assertions..." << endl; bool noConflict = simplifyAssertions(); + if(!noConflict){ + ++(d_smt.d_stats->d_simplifiedToFalse); + } dumpAssertions("post-simplify", d_assertionsToCheck); dumpAssertions("pre-static-learning", d_assertionsToCheck); @@ -2954,6 +3064,7 @@ void SmtEnginePrivate::processAssertions() { if(options::repeatSimp()) { d_assertionsToCheck.swap(d_assertionsToPreprocess); Chat() << "re-simplifying assertions..." << endl; + ScopeCounter depth(d_simplifyAssertionsDepth); noConflict &= simplifyAssertions(); if (noConflict) { // Need to fix up assertion list to maintain invariants: diff --git a/src/theory/booleans/theory_bool_rewriter.cpp b/src/theory/booleans/theory_bool_rewriter.cpp index 9867ccd4e..1caa4b429 100644 --- a/src/theory/booleans/theory_bool_rewriter.cpp +++ b/src/theory/booleans/theory_bool_rewriter.cpp @@ -22,6 +22,10 @@ namespace CVC4 { namespace theory { namespace booleans { +RewriteResponse TheoryBoolRewriter::postRewrite(TNode node) { + return preRewrite(node); +} + /** * flattenNode looks for children of same kind, and if found merges * them into the parent. @@ -88,6 +92,40 @@ RewriteResponse flattenNode(TNode n, TNode trivialNode, TNode skipNode) } } +// Equality parity returns +// * 0 if no relation between a and b is found +// * 1 if a == b +// * 2 if a == not(b) +// * 3 or b == not(a) +inline int equalityParity(TNode a, TNode b){ + if(a == b){ + return 1; + }else if(a.getKind() == kind::NOT && a[0] == b){ + return 2; + }else if(b.getKind() == kind::NOT && b[0] == a){ + return 3; + }else{ + return 0; + } +} + +inline Node makeNegation(TNode n){ + bool even = false; + while(n.getKind() == kind::NOT){ + n = n[0]; + even = !even; + } + if(even){ + return n; + } else { + if(n.isConst()){ + return NodeManager::currentNM()->mkConst(!n.getConst()); + }else{ + return n.notNode(); + } + } +} + RewriteResponse TheoryBoolRewriter::preRewrite(TNode n) { NodeManager* nodeManager = NodeManager::currentNM(); Node tt = nodeManager->mkConst(true); @@ -132,7 +170,7 @@ RewriteResponse TheoryBoolRewriter::preRewrite(TNode n) { if (n[0] == ff || n[1] == tt) return RewriteResponse(REWRITE_DONE, tt); if (n[0] == tt && n[0] == ff) return RewriteResponse(REWRITE_DONE, ff); if (n[0] == tt) return RewriteResponse(REWRITE_AGAIN, n[1]); - if (n[1] == ff) return RewriteResponse(REWRITE_AGAIN, n[0].notNode()); + if (n[1] == ff) return RewriteResponse(REWRITE_AGAIN, makeNegation(n[0])); break; } case kind::IFF: @@ -146,10 +184,10 @@ RewriteResponse TheoryBoolRewriter::preRewrite(TNode n) { return RewriteResponse(REWRITE_AGAIN, n[0]); } else if(n[0] == ff) { // IFF false x - return RewriteResponse(REWRITE_AGAIN, n[1].notNode()); + return RewriteResponse(REWRITE_AGAIN, makeNegation(n[1])); } else if(n[1] == ff) { // IFF x false - return RewriteResponse(REWRITE_AGAIN, n[0].notNode()); + return RewriteResponse(REWRITE_AGAIN, makeNegation(n[0])); } else if(n[0] == n[1]) { // IFF x x return RewriteResponse(REWRITE_DONE, tt); @@ -207,7 +245,7 @@ RewriteResponse TheoryBoolRewriter::preRewrite(TNode n) { if(kappa.knownLessThanOrEqual(two)){ return RewriteResponse(REWRITE_DONE, ff); }else{ - Node neitherEquality = (n[0].notNode()).andNode(n[1].notNode()); + Node neitherEquality = (makeNegation(n[0])).andNode(makeNegation(n[1])); return RewriteResponse(REWRITE_AGAIN, neitherEquality); } } @@ -219,10 +257,10 @@ RewriteResponse TheoryBoolRewriter::preRewrite(TNode n) { // rewrite simple cases of XOR if(n[0] == tt) { // XOR true x - return RewriteResponse(REWRITE_AGAIN, n[1].notNode()); + return RewriteResponse(REWRITE_AGAIN, makeNegation(n[1])); } else if(n[1] == tt) { // XCR x true - return RewriteResponse(REWRITE_AGAIN, n[0].notNode()); + return RewriteResponse(REWRITE_AGAIN, makeNegation(n[0])); } else if(n[0] == ff) { // XOR false x return RewriteResponse(REWRITE_AGAIN, n[1]); @@ -248,33 +286,79 @@ RewriteResponse TheoryBoolRewriter::preRewrite(TNode n) { if (n[0].isConst()) { if (n[0] == tt) { // ITE true x y + + Debug("bool-ite") << "n[0] ==tt " << n << ": " << n[1] << std::endl; return RewriteResponse(REWRITE_AGAIN, n[1]); } else { Assert(n[0] == ff); // ITE false x y + Debug("bool-ite") << "n[0] ==ff " << n << ": " << n[1] << std::endl; return RewriteResponse(REWRITE_AGAIN, n[2]); } } else if (n[1].isConst()) { if (n[1] == tt && n[2] == ff) { + Debug("bool-ite") << "n[1] ==tt && n[2] == ff " << n << ": " << n[0] << std::endl; return RewriteResponse(REWRITE_AGAIN, n[0]); } else if (n[1] == ff && n[2] == tt) { - return RewriteResponse(REWRITE_AGAIN, n[0].notNode()); + Debug("bool-ite") << "n[1] ==ff && n[2] == tt " << n << ": " << n[0].notNode() << std::endl; + return RewriteResponse(REWRITE_AGAIN, makeNegation(n[0])); } + // else if(n[1] == ff){ + // Node resp = (n[0].notNode()).andNode(n[2]); + // return RewriteResponse(REWRITE_AGAIN, resp); + // } } - if (n[1] == n[2]) { - return RewriteResponse(REWRITE_AGAIN, n[1]); + // else if (n[2].isConst()) { + // if(n[2] == ff){ + // Node resp = (n[0]).andNode(n[1]); + // return RewriteResponse(REWRITE_AGAIN, resp); + // } + // } + + int parityTmp; + if ((parityTmp = equalityParity(n[1], n[2])) != 0) { + Node resp = (parityTmp == 1) ? (Node)n[1] : n[0].iffNode(n[1]); + Debug("bool-ite") << "equalityParity n[1], n[2] " << parityTmp + << " " << n << ": " << resp << std::endl; + return RewriteResponse(REWRITE_AGAIN, resp); // Curiously, this rewrite affects several benchmarks dramatically, including copy_array and some simple_startup - disable for now // } else if (n[0].getKind() == kind::NOT) { // return RewriteResponse(REWRITE_AGAIN, n[0][0].iteNode(n[2], n[1])); - } else if (n[0] == n[1]) { - return RewriteResponse(REWRITE_AGAIN, n[0].iteNode(tt, n[2])); - } else if (n[0] == n[2]) { - return RewriteResponse(REWRITE_AGAIN, n[0].iteNode(n[1], ff)); - } else if (n[1].getKind() == kind::NOT && n[1][0] == n[0]) { - return RewriteResponse(REWRITE_AGAIN, n[0].iteNode(ff, n[2])); - } else if (n[2].getKind() == kind::NOT && n[2][0] == n[0]) { - return RewriteResponse(REWRITE_AGAIN, n[0].iteNode(n[1], tt)); + } else if(!n[1].isConst() && (parityTmp = equalityParity(n[0], n[1])) != 0){ + // (parityTmp == 1) if n[0] == n[1] + // otherwise, n[0] == not(n[1]) or not(n[0]) == n[1] + + // if n[1] is constant this can loop, this is possible in prewrite + Node resp = n[0].iteNode( (parityTmp == 1) ? tt : ff, n[2]); + Debug("bool-ite") << "equalityParity n[0], n[1] " << parityTmp + << " " << n << ": " << resp << std::endl; + return RewriteResponse(REWRITE_AGAIN, resp); + } else if(!n[2].isConst() && (parityTmp = equalityParity(n[0], n[2])) != 0){ + // (parityTmp == 1) if n[0] == n[2] + // otherwise, n[0] == not(n[2]) or not(n[0]) == n[2] + Node resp = n[0].iteNode(n[1], (parityTmp == 1) ? ff : tt); + Debug("bool-ite") << "equalityParity n[0], n[2] " << parityTmp + << " " << n << ": " << resp << std::endl; + return RewriteResponse(REWRITE_AGAIN, resp); + } else if(n[1].getKind() == kind::ITE && + (parityTmp = equalityParity(n[0], n[1][0])) != 0){ + // (parityTmp == 1) then n : (ite c (ite c x y) z) + // (parityTmp > 1) then n : (ite c (ite (not c) x y) z) or + // n: (ite (not c) (ite c x y) z) + Node resp = n[0].iteNode((parityTmp == 1) ? n[1][1] : n[1][2], n[2]); + Debug("bool-ite") << "equalityParity n[0], n[1][0] " << parityTmp + << " " << n << ": " << resp << std::endl; + return RewriteResponse(REWRITE_AGAIN, resp); + } else if(n[2].getKind() == kind::ITE && + (parityTmp = equalityParity(n[0], n[2][0])) != 0){ + // (parityTmp == 1) then n : (ite c x (ite c y z)) + // (parityTmp > 1) then n : (ite c x (ite (not c) y z)) or + // n: (ite (not c) x (ite c y z)) + Node resp = n[0].iteNode(n[1], (parityTmp == 1) ? n[2][2] : n[2][1]); + Debug("bool-ite") << "equalityParity n[0], n[2][0] " << parityTmp + << " " << n << ": " << resp << std::endl; + return RewriteResponse(REWRITE_AGAIN, resp); } break; } diff --git a/src/theory/booleans/theory_bool_rewriter.h b/src/theory/booleans/theory_bool_rewriter.h index 96bd2ae29..ac9469980 100644 --- a/src/theory/booleans/theory_bool_rewriter.h +++ b/src/theory/booleans/theory_bool_rewriter.h @@ -31,9 +31,7 @@ class TheoryBoolRewriter { public: static RewriteResponse preRewrite(TNode node); - static RewriteResponse postRewrite(TNode node) { - return preRewrite(node); - } + static RewriteResponse postRewrite(TNode node); static void init() {} static void shutdown() {} diff --git a/src/theory/ite_simplifier.cpp b/src/theory/ite_simplifier.cpp deleted file mode 100644 index 463a9c41a..000000000 --- a/src/theory/ite_simplifier.cpp +++ /dev/null @@ -1,501 +0,0 @@ -/********************* */ -/*! \file ite_simplifier.cpp - ** \verbatim - ** Original author: Clark Barrett - ** Major contributors: none - ** Minor contributors (to current version): Morgan Deters - ** This file is part of the CVC4 project. - ** Copyright (c) 2009-2013 New York University and The University of Iowa - ** See the file COPYING in the top-level source directory for licensing - ** information.\endverbatim - ** - ** \brief Simplifications for ITE expressions - ** - ** This module implements preprocessing phases designed to simplify ITE - ** expressions. Based on: - ** Kim, Somenzi, Jin. Efficient Term-ITE Conversion for SMT. FMCAD 2009. - ** Burch, Jerry. Techniques for Verifying Superscalar Microprocessors. DAC '96 - **/ - - -#include "theory/ite_simplifier.h" - - -using namespace std; -using namespace CVC4; -using namespace theory; - - -bool ITESimplifier::containsTermITE(TNode e) -{ - if (e.getKind() == kind::ITE && !e.getType().isBoolean()) { - return true; - } - - hash_map::iterator it; - it = d_containsTermITECache.find(e); - if (it != d_containsTermITECache.end()) { - return (*it).second; - } - - size_t k = 0, sz = e.getNumChildren(); - for (; k < sz; ++k) { - if (containsTermITE(e[k])) { - d_containsTermITECache[e] = true; - return true; - } - } - - d_containsTermITECache[e] = false; - return false; -} - - -bool ITESimplifier::leavesAreConst(TNode e, TheoryId tid) -{ - Assert((e.getKind() == kind::ITE && !e.getType().isBoolean()) || - Theory::theoryOf(e) != THEORY_BOOL); - if (e.isConst()) { - return true; - } - - hash_map::iterator it; - it = d_leavesConstCache.find(e); - if (it != d_leavesConstCache.end()) { - return (*it).second; - } - - if (!containsTermITE(e) && Theory::isLeafOf(e, tid)) { - d_leavesConstCache[e] = false; - return false; - } - - Assert(e.getNumChildren() > 0); - size_t k = 0, sz = e.getNumChildren(); - - if (e.getKind() == kind::ITE) { - k = 1; - } - - for (; k < sz; ++k) { - if (!leavesAreConst(e[k], tid)) { - d_leavesConstCache[e] = false; - return false; - } - } - d_leavesConstCache[e] = true; - return true; -} - - -Node ITESimplifier::simpConstants(TNode simpContext, TNode iteNode, TNode simpVar) -{ - NodePairMap::iterator it; - it = d_simpConstCache.find(pair(simpContext,iteNode)); - if (it != d_simpConstCache.end()) { - return (*it).second; - } - - if (iteNode.getKind() == kind::ITE) { - NodeBuilder<> builder(kind::ITE); - builder << iteNode[0]; - unsigned i = 1; - for (; i < iteNode.getNumChildren(); ++ i) { - Node n = simpConstants(simpContext, iteNode[i], simpVar); - if (n.isNull()) { - return n; - } - builder << n; - } - // Mark the substitution and continue - Node result = builder; - result = Rewriter::rewrite(result); - d_simpConstCache[pair(simpContext, iteNode)] = result; - return result; - } - - if (!containsTermITE(iteNode)) { - Node n = Rewriter::rewrite(simpContext.substitute(simpVar, iteNode)); - d_simpConstCache[pair(simpContext, iteNode)] = n; - return n; - } - - Node iteNode2; - Node simpVar2; - d_simpContextCache.clear(); - Node simpContext2 = createSimpContext(iteNode, iteNode2, simpVar2); - if (!simpContext2.isNull()) { - Assert(!iteNode2.isNull()); - simpContext2 = simpContext.substitute(simpVar, simpContext2); - Node n = simpConstants(simpContext2, iteNode2, simpVar2); - if (n.isNull()) { - return n; - } - d_simpConstCache[pair(simpContext, iteNode)] = n; - return n; - } - return Node(); -} - - -Node ITESimplifier::getSimpVar(TypeNode t) -{ - std::hash_map::iterator it; - it = d_simpVars.find(t); - if (it != d_simpVars.end()) { - return (*it).second; - } - else { - Node var = NodeManager::currentNM()->mkSkolem("iteSimp_$$", t, "is a variable resulting from ITE simplification"); - d_simpVars[t] = var; - return var; - } -} - - -Node ITESimplifier::createSimpContext(TNode c, Node& iteNode, Node& simpVar) -{ - NodeMap::iterator it; - it = d_simpContextCache.find(c); - if (it != d_simpContextCache.end()) { - return (*it).second; - } - - if (!containsTermITE(c)) { - d_simpContextCache[c] = c; - return c; - } - - if (c.getKind() == kind::ITE && !c.getType().isBoolean()) { - // Currently only support one ite node in a simp context - // Return Null if more than one is found - if (!iteNode.isNull()) { - return Node(); - } - simpVar = getSimpVar(c.getType()); - if (simpVar.isNull()) { - return Node(); - } - d_simpContextCache[c] = simpVar; - iteNode = c; - return simpVar; - } - - NodeBuilder<> builder(c.getKind()); - if (c.getMetaKind() == kind::metakind::PARAMETERIZED) { - builder << c.getOperator(); - } - unsigned i = 0; - for (; i < c.getNumChildren(); ++ i) { - Node newChild = createSimpContext(c[i], iteNode, simpVar); - if (newChild.isNull()) { - return newChild; - } - builder << newChild; - } - // Mark the substitution and continue - Node result = builder; - d_simpContextCache[c] = result; - return result; -} - - -Node ITESimplifier::simpITEAtom(TNode atom) -{ - if (leavesAreConst(atom)) { - Node iteNode; - Node simpVar; - d_simpContextCache.clear(); - Node simpContext = createSimpContext(atom, iteNode, simpVar); - if (!simpContext.isNull()) { - if (iteNode.isNull()) { - Assert(leavesAreConst(simpContext) && !containsTermITE(simpContext)); - return Rewriter::rewrite(simpContext); - } - Node n = simpConstants(simpContext, iteNode, simpVar); - if (!n.isNull()) { - return n; - } - } - } - return atom; -} - - -struct preprocess_stack_element { - TNode node; - bool children_added; - preprocess_stack_element(TNode node) - : node(node), children_added(false) {} -};/* struct preprocess_stack_element */ - - -Node ITESimplifier::simpITE(TNode assertion) -{ - // Do a topological sort of the subexpressions and substitute them - vector toVisit; - toVisit.push_back(assertion); - - while (!toVisit.empty()) - { - // The current node we are processing - preprocess_stack_element& stackHead = toVisit.back(); - TNode current = stackHead.node; - - // If node has no ITE's or already in the cache we're done, pop from the stack - if (current.getNumChildren() == 0 || - (Theory::theoryOf(current) != THEORY_BOOL && !containsTermITE(current))) { - d_simpITECache[current] = current; - toVisit.pop_back(); - continue; - } - - NodeMap::iterator find = d_simpITECache.find(current); - if (find != d_simpITECache.end()) { - toVisit.pop_back(); - continue; - } - - // Not yet substituted, so process - if (stackHead.children_added) { - // Children have been processed, so substitute - NodeBuilder<> builder(current.getKind()); - if (current.getMetaKind() == kind::metakind::PARAMETERIZED) { - builder << current.getOperator(); - } - for (unsigned i = 0; i < current.getNumChildren(); ++ i) { - Assert(d_simpITECache.find(current[i]) != d_simpITECache.end()); - builder << d_simpITECache[current[i]]; - } - // Mark the substitution and continue - Node result = builder; - - // If this is an atom, we process it - if (Theory::theoryOf(result) != THEORY_BOOL && - result.getType().isBoolean()) { - result = simpITEAtom(result); - } - - result = Rewriter::rewrite(result); - d_simpITECache[current] = result; - toVisit.pop_back(); - } else { - // Mark that we have added the children if any - if (current.getNumChildren() > 0) { - stackHead.children_added = true; - // We need to add the children - for(TNode::iterator child_it = current.begin(); child_it != current.end(); ++ child_it) { - TNode childNode = *child_it; - NodeMap::iterator childFind = d_simpITECache.find(childNode); - if (childFind == d_simpITECache.end()) { - toVisit.push_back(childNode); - } - } - } else { - // No children, so we're done - d_simpITECache[current] = current; - toVisit.pop_back(); - } - } - } - return d_simpITECache[assertion]; -} - - -ITESimplifier::CareSetPtr ITESimplifier::getNewSet() -{ - if (d_usedSets.empty()) { - return ITESimplifier::CareSetPtr::mkNew(*this); - } - else { - ITESimplifier::CareSetPtr cs = ITESimplifier::CareSetPtr::recycle(d_usedSets.back()); - cs.getCareSet().clear(); - d_usedSets.pop_back(); - return cs; - } -} - - -void ITESimplifier::updateQueue(CareMap& queue, - TNode e, - ITESimplifier::CareSetPtr& careSet) -{ - CareMap::iterator it = queue.find(e), iend = queue.end(); - if (it != iend) { - set& cs2 = (*it).second.getCareSet(); - ITESimplifier::CareSetPtr csNew = getNewSet(); - set_intersection(careSet.getCareSet().begin(), - careSet.getCareSet().end(), - cs2.begin(), cs2.end(), - inserter(csNew.getCareSet(), csNew.getCareSet().begin())); - (*it).second = csNew; - } - else { - queue[e] = careSet; - } -} - - -Node ITESimplifier::substitute(TNode e, TNodeMap& substTable, TNodeMap& cache) -{ - TNodeMap::iterator it = cache.find(e), iend = cache.end(); - if (it != iend) { - return it->second; - } - - // do substitution? - it = substTable.find(e); - iend = substTable.end(); - if (it != iend) { - Node result = substitute(it->second, substTable, cache); - cache[e] = result; - return result; - } - - size_t sz = e.getNumChildren(); - if (sz == 0) { - cache[e] = e; - return e; - } - - NodeBuilder<> builder(e.getKind()); - if (e.getMetaKind() == kind::metakind::PARAMETERIZED) { - builder << e.getOperator(); - } - for (unsigned i = 0; i < e.getNumChildren(); ++ i) { - builder << substitute(e[i], substTable, cache); - } - - Node result = builder; - // it = substTable.find(result); - // if (it != iend) { - // result = substitute(it->second, substTable, cache); - // } - cache[e] = result; - return result; -} - - -Node ITESimplifier::simplifyWithCare(TNode e) -{ - TNodeMap substTable; - CareMap queue; - CareMap::iterator it; - ITESimplifier::CareSetPtr cs = getNewSet(); - ITESimplifier::CareSetPtr cs2; - queue[e] = cs; - - TNode v; - bool done; - unsigned i; - - while (!queue.empty()) { - it = queue.end(); - --it; - v = it->first; - cs = it->second; - set& css = cs.getCareSet(); - queue.erase(v); - - done = false; - set::iterator iCare, iCareEnd = css.end(); - - switch (v.getKind()) { - case kind::ITE: { - iCare = css.find(v[0]); - if (iCare != iCareEnd) { - Assert(substTable.find(v) == substTable.end()); - substTable[v] = v[1]; - updateQueue(queue, v[1], cs); - done = true; - break; - } - else { - iCare = css.find(v[0].negate()); - if (iCare != iCareEnd) { - Assert(substTable.find(v) == substTable.end()); - substTable[v] = v[2]; - updateQueue(queue, v[2], cs); - done = true; - break; - } - } - updateQueue(queue, v[0], cs); - cs2 = getNewSet(); - cs2.getCareSet() = css; - cs2.getCareSet().insert(v[0]); - updateQueue(queue, v[1], cs2); - cs2 = getNewSet(); - cs2.getCareSet() = css; - cs2.getCareSet().insert(v[0].negate()); - updateQueue(queue, v[2], cs2); - done = true; - break; - } - case kind::AND: { - for (i = 0; i < v.getNumChildren(); ++i) { - iCare = css.find(v[i].negate()); - if (iCare != iCareEnd) { - Assert(substTable.find(v) == substTable.end()); - substTable[v] = d_false; - done = true; - break; - } - } - if (done) break; - - Assert(v.getNumChildren() > 1); - updateQueue(queue, v[0], cs); - cs2 = getNewSet(); - cs2.getCareSet() = css; - cs2.getCareSet().insert(v[0]); - for (i = 1; i < v.getNumChildren(); ++i) { - updateQueue(queue, v[i], cs2); - } - done = true; - break; - } - case kind::OR: { - for (i = 0; i < v.getNumChildren(); ++i) { - iCare = css.find(v[i]); - if (iCare != iCareEnd) { - Assert(substTable.find(v) == substTable.end()); - substTable[v] = d_true; - done = true; - break; - } - } - if (done) break; - - Assert(v.getNumChildren() > 1); - updateQueue(queue, v[0], cs); - cs2 = getNewSet(); - cs2.getCareSet() = css; - cs2.getCareSet().insert(v[0].negate()); - for (i = 1; i < v.getNumChildren(); ++i) { - updateQueue(queue, v[i], cs2); - } - done = true; - break; - } - default: - break; - } - - if (done) { - continue; - } - - for (unsigned i = 0; i < v.getNumChildren(); ++i) { - updateQueue(queue, v[i], cs); - } - } - while (!d_usedSets.empty()) { - delete d_usedSets.back(); - d_usedSets.pop_back(); - } - - TNodeMap cache; - return substitute(e, substTable, cache); -} - diff --git a/src/theory/ite_simplifier.h b/src/theory/ite_simplifier.h deleted file mode 100644 index 07fa0dedb..000000000 --- a/src/theory/ite_simplifier.h +++ /dev/null @@ -1,165 +0,0 @@ -/********************* */ -/*! \file ite_simplifier.h - ** \verbatim - ** Original author: Clark Barrett - ** Major contributors: none - ** Minor contributors (to current version): Morgan Deters - ** This file is part of the CVC4 project. - ** Copyright (c) 2009-2013 New York University and The University of Iowa - ** See the file COPYING in the top-level source directory for licensing - ** information.\endverbatim - ** - ** \brief Simplifications for ITE expressions - ** - ** This module implements preprocessing phases designed to simplify ITE - ** expressions. Based on: - ** Kim, Somenzi, Jin. Efficient Term-ITE Conversion for SMT. FMCAD 2009. - ** Burch, Jerry. Techniques for Verifying Superscalar Microprocessors. DAC '96 - **/ - -#include "cvc4_private.h" - -#ifndef __CVC4__ITE_SIMPLIFIER_H -#define __CVC4__ITE_SIMPLIFIER_H - -#include -#include -#include - -#include "expr/node.h" -#include "expr/command.h" -#include "prop/prop_engine.h" -#include "context/cdhashset.h" -#include "theory/theory.h" -#include "theory/rewriter.h" -#include "theory/shared_terms_database.h" -#include "theory/term_registration_visitor.h" -#include "theory/valuation.h" -#include "util/statistics_registry.h" -#include "util/hash.h" -#include "util/cache.h" -#include "util/ite_removal.h" - -namespace CVC4 { -namespace theory { - -class ITESimplifier { - Node d_true; - Node d_false; - - std::hash_map d_containsTermITECache; - bool containsTermITE(TNode e); - - std::hash_map d_leavesConstCache; - bool leavesAreConst(TNode e, theory::TheoryId tid); - bool leavesAreConst(TNode e) - { return leavesAreConst(e, theory::Theory::theoryOf(e)); } - - typedef std::hash_map NodeMap; - typedef std::hash_map TNodeMap; - - typedef std::pair NodePair; - struct NodePairHashFunction { - size_t operator () (const NodePair& pair) const { - size_t hash = 0; - hash = 0x9e3779b9 + NodeHashFunction().operator()(pair.first); - hash ^= 0x9e3779b9 + NodeHashFunction().operator()(pair.second) + (hash << 6) + (hash >> 2); - return hash; - } - };/* struct ITESimplifier::NodePairHashFunction */ - - typedef std::hash_map NodePairMap; - - - NodePairMap d_simpConstCache; - Node simpConstants(TNode simpContext, TNode iteNode, TNode simpVar); - std::hash_map d_simpVars; - Node getSimpVar(TypeNode t); - - NodeMap d_simpContextCache; - Node createSimpContext(TNode c, Node& iteNode, Node& simpVar); - - Node simpITEAtom(TNode atom); - - NodeMap d_simpITECache; - -public: - Node simpITE(TNode assertion); - -private: - - class CareSetPtr; - class CareSetPtrVal { - friend class ITESimplifier::CareSetPtr; - ITESimplifier& d_iteSimplifier; - unsigned d_refCount; - std::set d_careSet; - CareSetPtrVal(ITESimplifier& simp) : d_iteSimplifier(simp), d_refCount(1) {} - }; - - std::vector d_usedSets; - void careSetPtrGC(CareSetPtrVal* val) { - d_usedSets.push_back(val); - } - - class CareSetPtr { - CareSetPtrVal* d_val; - CareSetPtr(CareSetPtrVal* val) : d_val(val) {} - public: - CareSetPtr() : d_val(NULL) {} - CareSetPtr(const CareSetPtr& cs) { - d_val = cs.d_val; - if (d_val != NULL) { - ++(d_val->d_refCount); - } - } - ~CareSetPtr() { - if (d_val != NULL && (--(d_val->d_refCount) == 0)) { - d_val->d_iteSimplifier.careSetPtrGC(d_val); - } - } - CareSetPtr& operator=(const CareSetPtr& cs) { - if (d_val != cs.d_val) { - if (d_val != NULL && (--(d_val->d_refCount) == 0)) { - d_val->d_iteSimplifier.careSetPtrGC(d_val); - } - d_val = cs.d_val; - if (d_val != NULL) { - ++(d_val->d_refCount); - } - } - return *this; - } - std::set& getCareSet() { return d_val->d_careSet; } - static CareSetPtr mkNew(ITESimplifier& simp) { - CareSetPtrVal* val = new CareSetPtrVal(simp); - return CareSetPtr(val); - } - static CareSetPtr recycle(CareSetPtrVal* val) { - Assert(val != NULL && val->d_refCount == 0); - val->d_refCount = 1; - return CareSetPtr(val); - } - }; - - CareSetPtr getNewSet(); - - typedef std::map CareMap; - void updateQueue(CareMap& queue, TNode e, CareSetPtr& careSet); - Node substitute(TNode e, TNodeMap& substTable, TNodeMap& cache); - -public: - Node simplifyWithCare(TNode e); - - ITESimplifier() { - d_true = NodeManager::currentNM()->mkConst(true); - d_false = NodeManager::currentNM()->mkConst(false); - } - ~ITESimplifier() {} - -}; - -}/* CVC4::theory namespace */ -}/* CVC4 namespace */ - -#endif diff --git a/src/theory/ite_utilities.cpp b/src/theory/ite_utilities.cpp new file mode 100644 index 000000000..facd5f4f0 --- /dev/null +++ b/src/theory/ite_utilities.cpp @@ -0,0 +1,1613 @@ +/********************* */ +/*! \file ite_simplifier.cpp + ** \verbatim + ** Original author: Clark Barrett + ** Major contributors: none + ** Minor contributors (to current version): Morgan Deters + ** This file is part of the CVC4 project. + ** Copyright (c) 2009-2013 New York University and The University of Iowa + ** See the file COPYING in the top-level source directory for licensing + ** information.\endverbatim + ** + ** \brief Simplifications for ITE expressions + ** + ** This module implements preprocessing phases designed to simplify ITE + ** expressions. Based on: + ** Kim, Somenzi, Jin. Efficient Term-ITE Conversion for SMT. FMCAD 2009. + ** Burch, Jerry. Techniques for Verifying Superscalar Microprocessors. DAC '96 + **/ + + +#include "theory/ite_utilities.h" +#include +#include "theory/rewriter.h" +#include "theory/theory.h" + +using namespace std; +namespace CVC4 { +namespace theory { + +namespace ite { +inline static bool isTermITE(TNode e) { + return (e.getKind() == kind::ITE && !e.getType().isBoolean()); +} + +inline static bool triviallyContainsNoTermITEs(TNode e) { + return e.isConst() || e.isVar(); +} + +static bool isTheoryAtom(TNode a){ + using namespace kind; + switch(a.getKind()){ + case EQUAL: + case DISTINCT: + return !(a[0].getType().isBoolean()); + + /* from uf */ + case APPLY_UF: + return a.getType().isBoolean(); + case CARDINALITY_CONSTRAINT: + case DIVISIBLE: + case LT: + case LEQ: + case GT: + case GEQ: + case IS_INTEGER: + case BITVECTOR_COMP: + case BITVECTOR_ULT: + case BITVECTOR_ULE: + case BITVECTOR_UGT: + case BITVECTOR_UGE: + case BITVECTOR_SLT: + case BITVECTOR_SLE: + case BITVECTOR_SGT: + case BITVECTOR_SGE: + return true; + default: + return false; + } +} + +struct CTIVStackElement { + TNode curr; + unsigned pos; + CTIVStackElement(){} + CTIVStackElement(TNode c) : curr(c), pos(0){ } +};/* CTIVStackElement */ + +} /* CVC4::theory::ite */ + + + +ITEUtilities::ITEUtilities(ContainsTermITEVistor* containsVisitor) + : d_containsVisitor(containsVisitor) + , d_compressor(NULL) + , d_simplifier(NULL) + , d_careSimp(NULL) +{ + Assert(d_containsVisitor != NULL); +} + +ITEUtilities::~ITEUtilities(){ + + if(d_simplifier != NULL){ + delete d_simplifier; + } + if(d_compressor != NULL){ + delete d_compressor; + } + if(d_careSimp != NULL){ + delete d_careSimp; + } +} + +Node ITEUtilities::simpITE(TNode assertion){ + if(d_simplifier == NULL){ + d_simplifier = new ITESimplifier(d_containsVisitor); + } + return d_simplifier->simpITE(assertion); +} + +bool ITEUtilities::simpIteDidALotOfWorkHeuristic() const{ + if(d_simplifier == NULL){ + return false; + }else{ + return d_simplifier->doneALotOfWorkHeuristic(); + } +} + +/* returns false if an assertion is discovered to be equal to false. */ +bool ITEUtilities::compress(std::vector& assertions){ + if(d_compressor == NULL){ + d_compressor = new ITECompressor(d_containsVisitor); + } + return d_compressor->compress(assertions); +} + +Node ITEUtilities::simplifyWithCare(TNode e){ + if(d_careSimp == NULL){ + d_careSimp = new ITECareSimplifier(); + } + return d_careSimp->simplifyWithCare(e); +} + +void ITEUtilities::clear(){ + if(d_simplifier != NULL){ + d_simplifier->clearSimpITECaches(); + } + if(d_compressor != NULL){ + d_compressor->garbageCollect(); + } + if(d_careSimp != NULL){ + d_careSimp->clear(); + } +} + +/********************* */ +/* ContainsTermITEVistor + */ +ContainsTermITEVistor::ContainsTermITEVistor(): d_cache() {} +ContainsTermITEVistor::~ContainsTermITEVistor(){} +bool ContainsTermITEVistor::containsTermITE(TNode e){ + /* throughout execution skip through NOT nodes. */ + e = (e.getKind() == kind::NOT) ? e[0] : e; + if(ite::triviallyContainsNoTermITEs(e)){ return false; } + + NodeBoolMap::const_iterator end = d_cache.end(); + NodeBoolMap::const_iterator tmp_it = d_cache.find(e); + if(tmp_it != end){ + return (*tmp_it).second; + } + + bool foundTermIte = false; + std::vector stack; + stack.push_back(ite::CTIVStackElement(e)); + while(!foundTermIte && !stack.empty()){ + ite::CTIVStackElement& top = stack.back(); + TNode curr = top.curr; + if(top.pos >= curr.getNumChildren()){ + // all of the children have been visited + // no term ites were found + d_cache[curr] = false; + stack.pop_back(); + }else{ + // this is someone's child + TNode child = curr[top.pos]; + child = (child.getKind() == kind::NOT) ? child[0] : child; + ++top.pos; + if(ite::triviallyContainsNoTermITEs(child)){ + // skip + }else{ + tmp_it = d_cache.find(child); + if(tmp_it != end){ + foundTermIte = (*tmp_it).second; + }else{ + stack.push_back(ite::CTIVStackElement(child)); + foundTermIte = ite::isTermITE(child); + } + } + } + } + if(foundTermIte){ + while(!stack.empty()){ + TNode curr = stack.back().curr; + stack.pop_back(); + d_cache[curr] = true; + } + } + return foundTermIte; +} +void ContainsTermITEVistor::garbageCollect() { + d_cache.clear(); +} + +/********************* */ +/* IncomingArcCounter + */ +IncomingArcCounter::IncomingArcCounter(bool skipVars, bool skipConstants) + : d_reachCount() + , d_skipVariables(skipVars) + , d_skipConstants(skipConstants) +{} +IncomingArcCounter::~IncomingArcCounter(){} + +void IncomingArcCounter::computeReachability(const std::vector& assertions){ + std::vector tovisit(assertions.begin(), assertions.end()); + + while(!tovisit.empty()){ + TNode back = tovisit.back(); + tovisit.pop_back(); + + bool skip = false; + switch(back.getMetaKind()){ + case kind::metakind::CONSTANT: + skip = d_skipConstants; + break; + case kind::metakind::VARIABLE: + skip = d_skipVariables; + break; + default: + break; + } + + if(skip) { continue; } + if(d_reachCount.find(back) != d_reachCount.end()){ + d_reachCount[back] = 1 + d_reachCount[back]; + }else{ + d_reachCount[back] = 1; + for(TNode::iterator cit=back.begin(), end = back.end(); cit != end; ++cit){ + tovisit.push_back(*cit); + } + } + } +} + +void IncomingArcCounter::clear() { + d_reachCount.clear(); +} + +/********************* */ +/* ITECompressor + */ +ITECompressor::ITECompressor(ContainsTermITEVistor* contains) + : d_contains(contains) + , d_assertions(NULL) + , d_incoming(true, true) +{ + Assert(d_contains != NULL); + + d_true = NodeManager::currentNM()->mkConst(true); + d_false = NodeManager::currentNM()->mkConst(false); +} + +ITECompressor::~ITECompressor() { + reset(); +} + +void ITECompressor::reset(){ + d_incoming.clear(); + d_compressed.clear(); +} + +void ITECompressor::garbageCollect(){ + reset(); +} + +ITECompressor::Statistics::Statistics(): + d_compressCalls("ite-simp::compressCalls", 0), + d_skolemsAdded("ite-simp::skolems", 0) +{ + StatisticsRegistry::registerStat(&d_compressCalls); + StatisticsRegistry::registerStat(&d_skolemsAdded); + +} +ITECompressor::Statistics::~Statistics(){ + StatisticsRegistry::unregisterStat(&d_compressCalls); + StatisticsRegistry::unregisterStat(&d_skolemsAdded); +} + +Node ITECompressor::push_back_boolean(Node original, Node compressed){ + Node rewritten = Rewriter::rewrite(compressed); + // There is a bug if the rewritter takes a pure boolean expression + // and changes its theory + if(rewritten.isConst()){ + d_compressed[compressed] = rewritten; + d_compressed[original] = rewritten; + d_compressed[rewritten] = rewritten; + return rewritten; + }else if(d_compressed.find(rewritten) != d_compressed.end()){ + Node res = d_compressed[rewritten]; + d_compressed[original] = res; + d_compressed[compressed] = res; + return res; + }else if(rewritten.isVar() || + (rewritten.getKind() == kind::NOT && rewritten[0].isVar())){ + d_compressed[original] = rewritten; + d_compressed[compressed] = rewritten; + d_compressed[rewritten] = rewritten; + return rewritten; + }else{ + NodeManager* nm = NodeManager::currentNM(); + Node skolem = nm->mkSkolem("compress_$$", nm->booleanType()); + d_compressed[rewritten] = skolem; + d_compressed[original] = skolem; + d_compressed[compressed] = skolem; + + Node iff = skolem.iffNode(rewritten); + d_assertions->push_back(iff); + ++(d_statistics.d_skolemsAdded); + return skolem; + } +} + +bool ITECompressor::multipleParents(TNode c){ + return d_incoming.lookupIncoming(c) >= 2; +} + +Node ITECompressor::compressBooleanITEs(Node toCompress){ + Assert(toCompress.getKind() == kind::ITE); + Assert(toCompress.getType().isBoolean()); + + if(!(toCompress[1] == d_false || toCompress[2] == d_false)){ + Node cmpCnd = compressBoolean(toCompress[0]); + if(cmpCnd.isConst()){ + Node branch = (cmpCnd == d_true) ? toCompress[1] : toCompress[2]; + Node res = compressBoolean(branch); + d_compressed[toCompress] = res; + return res; + }else{ + Node cmpThen = compressBoolean(toCompress[1]); + Node cmpElse = compressBoolean(toCompress[2]); + Node newIte = cmpCnd.iteNode(cmpThen, cmpElse); + if(multipleParents(toCompress)){ + return push_back_boolean(toCompress, newIte); + }else{ + return newIte; + } + } + } + + NodeBuilder<> nb(kind::AND); + Node curr = toCompress; + while(curr.getKind() == kind::ITE && + (curr[1] == d_false || curr[2] == d_false) && + (!multipleParents(curr) || curr == toCompress)){ + + bool negateCnd = (curr[1] == d_false); + Node compressCnd = compressBoolean(curr[0]); + if(compressCnd.isConst()){ + if(compressCnd.getConst() == negateCnd){ + return push_back_boolean(toCompress, d_false); + }else{ + // equivalent to true don't push back + } + }else{ + Node pb = negateCnd ? compressCnd.notNode() : compressCnd; + nb << pb; + } + curr = negateCnd ? curr[2] : curr[1]; + } + Assert(toCompress != curr); + + nb << compressBoolean(curr); + Node res = nb.getNumChildren() == 1 ? nb[0] : (Node)nb; + return push_back_boolean(toCompress, res); +} + +Node ITECompressor::compressTerm(Node toCompress){ + if(toCompress.isConst() || toCompress.isVar()){ + return toCompress; + } + + if(d_compressed.find(toCompress) != d_compressed.end()){ + return d_compressed[toCompress]; + } + if(toCompress.getKind() == kind::ITE){ + Node cmpCnd = compressBoolean(toCompress[0]); + if(cmpCnd.isConst()){ + Node branch = (cmpCnd == d_true) ? toCompress[1] : toCompress[2]; + Node res = compressTerm(toCompress); + d_compressed[toCompress] = res; + return res; + }else{ + Node cmpThen = compressTerm(toCompress[1]); + Node cmpElse = compressTerm(toCompress[2]); + Node newIte = cmpCnd.iteNode(cmpThen, cmpElse); + d_compressed[toCompress] = newIte; + return newIte; + } + } + + NodeBuilder<> nb(toCompress.getKind()); + + if(toCompress.getMetaKind() == kind::metakind::PARAMETERIZED) { + nb << (toCompress.getOperator()); + } + for(Node::iterator it = toCompress.begin(), end = toCompress.end(); it != end; ++it){ + nb << compressTerm(*it); + } + Node compressed = (Node)nb; + if(multipleParents(toCompress)){ + d_compressed[toCompress] = compressed; + } + return compressed; +} + +Node ITECompressor::compressBoolean(Node toCompress){ + static int instance = 0; + ++instance; + if(toCompress.isConst() || toCompress.isVar()){ + return toCompress; + } + if(d_compressed.find(toCompress) != d_compressed.end()){ + return d_compressed[toCompress]; + }else if(toCompress.getKind() == kind::ITE){ + return compressBooleanITEs(toCompress); + }else{ + bool ta = ite::isTheoryAtom(toCompress); + NodeBuilder<> nb(toCompress.getKind()); + if(toCompress.getMetaKind() == kind::metakind::PARAMETERIZED) { + nb << (toCompress.getOperator()); + } + for(Node::iterator it = toCompress.begin(), end = toCompress.end(); it != end; ++it){ + Node pb = (ta) ? compressTerm(*it) : compressBoolean(*it); + nb << pb; + } + Node compressed = nb; + if(ta || multipleParents(toCompress)){ + return push_back_boolean(toCompress, compressed); + }else{ + return compressed; + } + } +} + + + +bool ITECompressor::compress(std::vector& assertions){ + reset(); + + d_assertions = &assertions; + d_incoming.computeReachability(assertions); + + ++(d_statistics.d_compressCalls); + Chat() << "Computed reachability" << endl; + + bool nofalses = true; + size_t original_size = assertions.size(); + Chat () << "compressing " << original_size << endl; + for(size_t i = 0; i < original_size && nofalses; ++i){ + Node assertion = assertions[i]; + Node compressed = compressBoolean(assertion); + Node rewritten = Rewriter::rewrite(compressed); + assertions[i] = rewritten; + Assert(!d_contains->containsTermITE(rewritten)); + + nofalses = (rewritten != d_false); + } + + d_assertions = NULL; + + return nofalses; +} + +TermITEHeightCounter::TermITEHeightCounter() + :d_termITEHeight() +{} + +TermITEHeightCounter::~TermITEHeightCounter(){} + +void TermITEHeightCounter::clear(){ + d_termITEHeight.clear(); +} + +size_t TermITEHeightCounter::cache_size() const{ + return d_termITEHeight.size(); +} + +namespace ite { +struct TITEHStackElement { + TNode curr; + unsigned pos; + uint32_t maxChildHeight; + TITEHStackElement(){} + TITEHStackElement(TNode c) : curr(c), pos(0), maxChildHeight(0){ } +}; +} /* namespace ite */ + +uint32_t TermITEHeightCounter::termITEHeight(TNode e){ + + if(ite::triviallyContainsNoTermITEs(e)){ return 0; } + + NodeCountMap::const_iterator end = d_termITEHeight.end(); + NodeCountMap::const_iterator tmp_it = d_termITEHeight.find(e); + if(tmp_it != end){ + return (*tmp_it).second; + } + + + uint32_t returnValue = 0; + // This is initially 0 as the very first call this is included in the max, + // but this has no effect. + std::vector stack; + stack.push_back(ite::TITEHStackElement(e)); + while(!stack.empty()){ + ite::TITEHStackElement& top = stack.back(); + top.maxChildHeight = std::max(top.maxChildHeight, returnValue); + TNode curr = top.curr; + if(top.pos >= curr.getNumChildren()){ + // done with the current node + returnValue = top.maxChildHeight + (ite::isTermITE(curr) ? 1 : 0); + d_termITEHeight[curr] = returnValue; + stack.pop_back(); + continue; + }else{ + if(top.pos == 0 && curr.getKind() == kind::ITE){ + ++top.pos; + returnValue = 0; + continue; + } + // this is someone's child + TNode child = curr[top.pos]; + ++top.pos; + if(ite::triviallyContainsNoTermITEs(child)){ + returnValue = 0; + }else{ + tmp_it = d_termITEHeight.find(child); + if(tmp_it != end){ + returnValue = (*tmp_it).second; + }else{ + stack.push_back(ite::TITEHStackElement(child)); + } + } + } + } + return returnValue; +} + + + +ITESimplifier::ITESimplifier(ContainsTermITEVistor* contains) + : d_containsVisitor(contains) + , d_termITEHeight() + , d_constantLeaves() + , d_allocatedConstantLeaves() + , d_citeEqConstApplications(0) + , d_constantIteEqualsConstantCache() + , d_replaceOverCache() + , d_replaceOverTermIteCache() + , d_leavesConstCache() + , d_simpConstCache() + , d_simpContextCache() + , d_simpITECache() +{ + Assert(d_containsVisitor != NULL); + d_true = NodeManager::currentNM()->mkConst(true); + d_false = NodeManager::currentNM()->mkConst(false); +} + +ITESimplifier::~ITESimplifier() { + clearSimpITECaches(); + Assert(d_constantLeaves.empty()); + Assert(d_allocatedConstantLeaves.empty()); +} + +bool ITESimplifier::leavesAreConst(TNode e){ + return leavesAreConst(e, theory::Theory::theoryOf(e)); +} + +void ITESimplifier::clearSimpITECaches(){ + Chat() << "clear ite caches " << endl; + for(size_t i = 0, N = d_allocatedConstantLeaves.size(); i < N; ++i){ + NodeVec* curr = d_allocatedConstantLeaves[i]; + delete curr; + } + d_citeEqConstApplications = 0; + d_constantLeaves.clear(); + d_allocatedConstantLeaves.clear(); + d_termITEHeight.clear(); + d_constantIteEqualsConstantCache.clear(); + d_replaceOverCache.clear(); + d_replaceOverTermIteCache.clear(); + d_simpITECache.clear(); + d_simpVars.clear(); + d_simpConstCache.clear(); + d_leavesConstCache.clear(); + d_simpContextCache.clear(); +} + +bool ITESimplifier::doneALotOfWorkHeuristic() const { + static const size_t SIZE_BOUND = 1000; + Chat() << "d_citeEqConstApplications size " << d_citeEqConstApplications << endl; + return (d_citeEqConstApplications > SIZE_BOUND); +} + +ITESimplifier::Statistics::Statistics(): + d_maxNonConstantsFolded("ite-simp::maxNonConstantsFolded", 0), + d_unexpected("ite-simp::unexpected", 0), + d_unsimplified("ite-simp::unsimplified", 0), + d_exactMatchFold("ite-simp::exactMatchFold", 0), + d_binaryPredFold("ite-simp::binaryPredFold", 0), + d_specialEqualityFolds("ite-simp::specialEqualityFolds", 0), + d_simpITEVisits("ite-simp::simpITE.visits", 0), + d_inSmaller("ite-simp::inSmaller") +{ + StatisticsRegistry::registerStat(&d_maxNonConstantsFolded); + StatisticsRegistry::registerStat(&d_unexpected); + StatisticsRegistry::registerStat(&d_unsimplified); + StatisticsRegistry::registerStat(&d_exactMatchFold); + StatisticsRegistry::registerStat(&d_binaryPredFold); + StatisticsRegistry::registerStat(&d_specialEqualityFolds); + StatisticsRegistry::registerStat(&d_simpITEVisits); + StatisticsRegistry::registerStat(&d_inSmaller); +} + +ITESimplifier::Statistics::~Statistics(){ + StatisticsRegistry::unregisterStat(&d_maxNonConstantsFolded); + StatisticsRegistry::unregisterStat(&d_unexpected); + StatisticsRegistry::unregisterStat(&d_unsimplified); + StatisticsRegistry::unregisterStat(&d_exactMatchFold); + StatisticsRegistry::unregisterStat(&d_binaryPredFold); + StatisticsRegistry::unregisterStat(&d_specialEqualityFolds); + StatisticsRegistry::unregisterStat(&d_simpITEVisits); + StatisticsRegistry::unregisterStat(&d_inSmaller); +} + +bool ITESimplifier::isConstantIte(TNode e){ + if(e.isConst()){ + return true; + }else if(ite::isTermITE(e)){ + NodeVec* constants = computeConstantLeaves(e); + return constants != NULL; + }else{ + return false; + } +} + +ITESimplifier::NodeVec* ITESimplifier::computeConstantLeaves(TNode ite){ + Assert(ite::isTermITE(ite)); + ConstantLeavesMap::const_iterator it = d_constantLeaves.find(ite); + ConstantLeavesMap::const_iterator end = d_constantLeaves.end(); + if(it != end){ + return (*it).second; + } + TNode thenB = ite[1]; + TNode elseB = ite[2]; + + // special case 2 constant children + if(thenB.isConst() && elseB.isConst()){ + NodeVec* pair = new NodeVec(2); + (*pair)[0] = std::min(thenB, elseB); + (*pair)[1] = std::max(thenB, elseB); + d_constantLeaves[ite] = pair; + return pair; + } + // At least 1 is an ITE + if(!(thenB.isConst() || thenB.getKind() == kind::ITE) || + !(elseB.isConst() || elseB.getKind() == kind::ITE)){ + // Cannot be a termITE tree + d_constantLeaves[ite] = NULL; + return NULL; + } + + // At least 1 is not a constant + TNode definitelyITE = thenB.isConst() ? elseB : thenB; + TNode maybeITE = thenB.isConst() ? thenB : elseB; + + NodeVec* defChildren = computeConstantLeaves(definitelyITE); + if(defChildren == NULL){ + d_constantLeaves[ite] = NULL; + return NULL; + } + + NodeVec scratch; + NodeVec* maybeChildren = NULL; + if(maybeITE.getKind() == kind::ITE){ + maybeChildren = computeConstantLeaves(maybeITE); + }else{ + scratch.push_back(maybeITE); + maybeChildren = &scratch; + } + if(maybeChildren == NULL){ + d_constantLeaves[ite] = NULL; + return NULL; + } + + NodeVec* both = new NodeVec(defChildren->size()+maybeChildren->size()); + NodeVec::iterator newEnd; + newEnd = std::set_union(defChildren->begin(), defChildren->end(), + maybeChildren->begin(), maybeChildren->end(), + both->begin()); + both->resize(newEnd - both->begin()); + d_constantLeaves[ite] = both; + return both; +} + +// This is uncached! Better for protoyping or getting limited size examples +struct IteTreeSearchData{ + set visited; + set constants; + set nonConstants; + int maxConstants; + int maxNonconstants; + int maxDepth; + bool failure; + IteTreeSearchData() + : maxConstants(-1), maxNonconstants(-1), maxDepth(-1), failure(false) + {} +}; +void iteTreeSearch(Node e, int depth, IteTreeSearchData& search){ + if(search.maxDepth >= 0 && depth > search.maxDepth){ + search.failure = true; + } + if(search.failure){ + return; + } + if(search.visited.find(e) != search.visited.end()){ + return; + }else{ + search.visited.insert(e); + } + + if(e.isConst()){ + search.constants.insert(e); + if(search.maxConstants >= 0 && + search.constants.size() > (unsigned)search.maxConstants){ + search.failure = true; + } + }else if(e.getKind() == kind::ITE){ + iteTreeSearch(e[1], depth+1, search); + iteTreeSearch(e[2], depth+1, search); + }else{ + search.nonConstants.insert(e); + if(search.maxNonconstants >= 0 && + search.nonConstants.size() > (unsigned)search.maxNonconstants){ + search.failure = true; + } + } +} + +Node ITESimplifier::replaceOver(Node n, Node replaceWith, Node simpVar){ + if(n == simpVar){ + return replaceWith; + }else if(n.getNumChildren() == 0){ + return n; + } + Assert(n.getNumChildren() > 0); + Assert(!n.isVar()); + + pair p = make_pair(n, replaceWith); + if(d_replaceOverCache.find(p) != d_replaceOverCache.end()){ + return d_replaceOverCache[p]; + } + + NodeBuilder<> builder(n.getKind()); + if (n.getMetaKind() == kind::metakind::PARAMETERIZED) { + builder << n.getOperator(); + } + unsigned i = 0; + for (; i < n.getNumChildren(); ++ i) { + Node newChild = replaceOver(n[i], replaceWith, simpVar); + builder << newChild; + } + // Mark the substitution and continue + Node result = builder; + d_replaceOverCache[p] = result; + return result; +} + +Node ITESimplifier::replaceOverTermIte(Node e, Node simpAtom, Node simpVar){ + if(e.getKind() == kind::ITE){ + pair p = make_pair(e, simpAtom); + if(d_replaceOverTermIteCache.find(p) != d_replaceOverTermIteCache.end()){ + return d_replaceOverTermIteCache[p]; + } + Assert(!e.getType().isBoolean()); + Node cnd = e[0]; + Node newThen = replaceOverTermIte(e[1], simpAtom, simpVar); + Node newElse = replaceOverTermIte(e[2], simpAtom, simpVar); + Node newIte = cnd.iteNode(newThen, newElse); + d_replaceOverTermIteCache[p] = newIte; + return newIte; + }else{ + return replaceOver(simpAtom, e, simpVar); + } +} + +Node ITESimplifier::attemptLiftEquality(TNode atom){ + if(atom.getKind() == kind::EQUAL){ + TNode left = atom[0]; + TNode right = atom[1]; + if((left.getKind() == kind::ITE || right.getKind() == kind::ITE)&& + !(left.getKind() == kind::ITE && right.getKind() == kind::ITE)){ + + // exactly 1 is an ite + TNode ite = left.getKind() == kind::ITE ? left :right; + TNode notIte = left.getKind() == kind::ITE ? right : left; + + if(notIte == ite[1]){ + ++(d_statistics.d_exactMatchFold); + return ite[0].iteNode(d_true, notIte.eqNode(ite[2])); + }else if(notIte == ite[2]){ + ++(d_statistics.d_exactMatchFold); + return ite[0].iteNode(notIte.eqNode(ite[1]), d_true); + } + if(notIte.isConst() && + (ite[1].isConst() || ite[2].isConst())){ + ++(d_statistics.d_exactMatchFold); + return ite[0].iteNode(notIte.eqNode(ite[1]), notIte.eqNode(ite[2])); + } + } + } + + // try a similar more relaxed version for non-equality operators + if(atom.getMetaKind() == kind::metakind::OPERATOR && + atom.getNumChildren() == 2 && + !atom[1].getType().isBoolean()){ + + TNode left = atom[0]; + TNode right = atom[1]; + if( (left.getKind() == kind::ITE || right.getKind() == kind::ITE)&& + !(left.getKind() == kind::ITE && right.getKind() == kind::ITE)){ + // exactly 1 is an ite + bool leftIsIte = left.getKind() == kind::ITE; + Node ite = leftIsIte ? left :right; + Node notIte = leftIsIte ? right : left; + + if(notIte.isConst()){ + IteTreeSearchData search; + search.maxNonconstants = 2; + iteTreeSearch(ite, 0, search); + if(!search.failure){ + d_statistics.d_maxNonConstantsFolded.maxAssign(search.nonConstants.size()); + Debug("ite::simpite") << "used " << search.nonConstants.size() << " nonconstants" << endl; + NodeManager* nm = NodeManager::currentNM(); + Node simpVar = getSimpVar(notIte.getType()); + TNode newLeft = leftIsIte ? simpVar : notIte; + TNode newRight = leftIsIte ? notIte : simpVar; + Node newAtom = nm->mkNode(atom.getKind(), newLeft, newRight); + + ++(d_statistics.d_binaryPredFold); + return replaceOverTermIte(ite, newAtom, simpVar); + } + } + } + } + + // TODO "This is way too tailored. Must generalize!" + if(atom.getKind() == kind::EQUAL && + atom.getNumChildren() == 2 && + ite::isTermITE(atom[0]) && + atom[1].getKind() == kind::MULT && + atom[1].getNumChildren() == 2 && + atom[1][0].isConst() && + atom[1][0].getConst().isNegativeOne() && + ite::isTermITE(atom[1][1]) && + d_termITEHeight.termITEHeight(atom[0]) == 1 && + d_termITEHeight.termITEHeight(atom[1][1]) == 1 && + (atom[0][1].isConst() || atom[0][2].isConst()) && + (atom[1][1][1].isConst() || atom[1][1][2].isConst()) ){ + // expand all 4 cases + + Node negOne = atom[1][0]; + + Node lite = atom[0]; + Node lC = lite[0]; + Node lT = lite[1]; + Node lE = lite[2]; + + NodeManager* nm = NodeManager::currentNM(); + Node negRite = atom[1][1]; + Node rC = negRite[0]; + Node rT = nm->mkNode(kind::MULT, negOne, negRite[1]); + Node rE = nm->mkNode(kind::MULT, negOne, negRite[2]); + + // (ite lC lT lE) = (ite rC rT rE) + // (ite lc (= lT (ite rC rT rE) (= lE (ite rC rT rE)))) + // (ite lc (ite rC (= lT rT) (= lT rE)) + // (ite rC (= lE rT) (= lE rE))) + + Node eqTT = lT.eqNode(rT); + Node eqTE = lT.eqNode(rE); + Node eqET = lE.eqNode(rT); + Node eqEE = lE.eqNode(rE); + Node thenLC = rC.iteNode(eqTT, eqTE); + Node elseLC = rC.iteNode(eqET, eqEE); + Node newIte = lC.iteNode(thenLC, elseLC); + + ++(d_statistics.d_specialEqualityFolds); + return newIte; + } + return Node::null(); +} + +// Interesting classes of atoms: +// 2. Contains constants and 1 constant term ite +// 3. Contains 2 constant term ites +Node ITESimplifier::transformAtom(TNode atom){ + if(! d_containsVisitor->containsTermITE(atom)){ + if(atom.getKind() == kind::EQUAL && + atom[0].isConst() && atom[1].isConst()){ + // constant equality + return NodeManager::currentNM()->mkConst(atom[0] == atom[1]); + } + return Node::null(); + }else{ + Node acr = attemptConstantRemoval(atom); + if(!acr.isNull()){ + return acr; + } + // Node ale = attemptLiftEquality(atom); + // if(!ale.isNull()){ + // //return ale; + // } + return Node::null(); + } +} + +static unsigned numBranches = 0; +static unsigned numFalseBranches = 0; +static unsigned itesMade = 0; + +Node ITESimplifier::constantIteEqualsConstant(TNode cite, TNode constant){ + static int instance = 0; + ++instance; + Debug("ite::constantIteEqualsConstant") << instance << "constantIteEqualsConstant("<" << res << endl; + return res; + } + std::pair pair = make_pair(cite, constant); + + NodePairMap::const_iterator eq_pos = d_constantIteEqualsConstantCache.find(pair); + if(eq_pos != d_constantIteEqualsConstantCache.end()){ + Debug("ite::constantIteEqualsConstant") << instance << "->" << (*eq_pos).second << endl; + return (*eq_pos).second; + } + + ++d_citeEqConstApplications; + + NodeVec* leaves = computeConstantLeaves(cite); + Assert(leaves != NULL); + if(std::binary_search(leaves->begin(), leaves->end(), constant)){ + if(leaves->size() == 1){ + // probably unreachable + d_constantIteEqualsConstantCache[pair] = d_true; + Debug("ite::constantIteEqualsConstant") << instance << "->" << d_true << endl; + return d_true; + }else{ + Assert(cite.getKind() == kind::ITE); + TNode cnd = cite[0]; + TNode tB = cite[1]; + TNode fB = cite[2]; + Node tEqs = constantIteEqualsConstant(tB, constant); + Node fEqs = constantIteEqualsConstant(fB, constant); + Node boolIte = cnd.iteNode(tEqs, fEqs); + if(!(tEqs.isConst() || fEqs.isConst())){ + ++numBranches; + } + if(!(tEqs == d_false || fEqs == d_false)){ + ++numFalseBranches; + } + ++itesMade; + d_constantIteEqualsConstantCache[pair] = boolIte; + //Debug("ite::constantIteEqualsConstant") << instance << "->" << boolIte << endl; + return boolIte; + } + }else{ + d_constantIteEqualsConstantCache[pair] = d_false; + Debug("ite::constantIteEqualsConstant") << instance << "->" << d_false << endl; + return d_false; + } +} + + +Node ITESimplifier::intersectConstantIte(TNode lcite, TNode rcite){ + // intersect the constant ite trees lcite and rcite + + if(lcite.isConst() || rcite.isConst()){ + bool lIsConst = lcite.isConst(); + TNode constant = lIsConst ? lcite : rcite; + TNode cite = lIsConst ? rcite : lcite; + + (d_statistics.d_inSmaller)<< 1; + unsigned preItesMade = itesMade; + unsigned preNumBranches = numBranches; + unsigned preNumFalseBranches = numFalseBranches; + Node bterm = constantIteEqualsConstant(cite, constant); + Debug("intersectConstantIte") + << (numBranches - preNumBranches) + << " " << (numFalseBranches - preNumFalseBranches) + << " " << (itesMade - preItesMade) << endl; + return bterm; + } + Assert(lcite.getKind() == kind::ITE); + Assert(rcite.getKind() == kind::ITE); + + NodeVec* leftValues = computeConstantLeaves(lcite); + NodeVec* rightValues = computeConstantLeaves(rcite); + + uint32_t smaller = std::min(leftValues->size(), rightValues->size()); + + (d_statistics.d_inSmaller)<< smaller; + NodeVec intersection(smaller, Node::null()); + NodeVec::iterator newEnd; + newEnd = std::set_intersection(leftValues->begin(), leftValues->end(), + rightValues->begin(), rightValues->end(), + intersection.begin()); + intersection.resize(newEnd - intersection.begin()); + if(intersection.empty()){ + return d_false; + }else{ + NodeBuilder<> nb(kind::OR); + NodeVec::const_iterator it = intersection.begin(), end=intersection.end(); + for(; it != end; ++it){ + Node inBoth = *it; + Node lefteq = constantIteEqualsConstant(lcite, inBoth); + Node righteq = constantIteEqualsConstant(rcite, inBoth); + Node bothHold = lefteq.andNode(righteq); + nb << bothHold; + } + Node result = (nb.getNumChildren() >= 1) ? (Node)nb : nb[0]; + return result; + } +} + + +Node ITESimplifier::attemptEagerRemoval(TNode atom){ + if(atom.getKind() == kind::EQUAL){ + TNode left = atom[0]; + TNode right = atom[1]; + if((left.isConst() && + right.getKind() == kind::ITE && isConstantIte(right)) || + (right.isConst() && + left.getKind() == kind::ITE && isConstantIte(left))){ + TNode constant = left.isConst() ? left : right; + TNode cite = left.isConst() ? right : left; + + std::pair pair = make_pair(cite, constant); + NodePairMap::const_iterator eq_pos = d_constantIteEqualsConstantCache.find(pair); + if(eq_pos != d_constantIteEqualsConstantCache.end()){ + Node ret = (*eq_pos).second; + if(ret.isConst()){ + return ret; + }else{ + return Node::null(); + } + } + + NodeVec* leaves = computeConstantLeaves(cite); + Assert(leaves != NULL); + if(!std::binary_search(leaves->begin(), leaves->end(), constant)){ + std::pair pair = make_pair(cite, constant); + d_constantIteEqualsConstantCache[pair] = d_false; + return d_false; + } + } + } + return Node::null(); +} + +Node ITESimplifier::attemptConstantRemoval(TNode atom){ + if(atom.getKind() == kind::EQUAL){ + TNode left = atom[0]; + TNode right = atom[1]; + if(isConstantIte(left) && isConstantIte(right)){ + return intersectConstantIte(left, right); + } + } + return Node::null(); +} + + +bool ITESimplifier::leavesAreConst(TNode e, TheoryId tid) +{ + Assert((e.getKind() == kind::ITE && !e.getType().isBoolean()) || + Theory::theoryOf(e) != THEORY_BOOL); + if (e.isConst()) { + return true; + } + + hash_map::iterator it; + it = d_leavesConstCache.find(e); + if (it != d_leavesConstCache.end()) { + return (*it).second; + } + + if (!containsTermITE(e) && Theory::isLeafOf(e, tid)) { + d_leavesConstCache[e] = false; + return false; + } + + Assert(e.getNumChildren() > 0); + size_t k = 0, sz = e.getNumChildren(); + + if (e.getKind() == kind::ITE) { + k = 1; + } + + for (; k < sz; ++k) { + if (!leavesAreConst(e[k], tid)) { + d_leavesConstCache[e] = false; + return false; + } + } + d_leavesConstCache[e] = true; + return true; +} + + +Node ITESimplifier::simpConstants(TNode simpContext, TNode iteNode, TNode simpVar) +{ + NodePairMap::iterator it; + it = d_simpConstCache.find(pair(simpContext,iteNode)); + if (it != d_simpConstCache.end()) { + return (*it).second; + } + + if (iteNode.getKind() == kind::ITE) { + NodeBuilder<> builder(kind::ITE); + builder << iteNode[0]; + unsigned i = 1; + for (; i < iteNode.getNumChildren(); ++ i) { + Node n = simpConstants(simpContext, iteNode[i], simpVar); + if (n.isNull()) { + return n; + } + builder << n; + } + // Mark the substitution and continue + Node result = builder; + result = Rewriter::rewrite(result); + d_simpConstCache[pair(simpContext, iteNode)] = result; + return result; + } + + if (!containsTermITE(iteNode)) { + Node n = Rewriter::rewrite(simpContext.substitute(simpVar, iteNode)); + d_simpConstCache[pair(simpContext, iteNode)] = n; + return n; + } + + Node iteNode2; + Node simpVar2; + d_simpContextCache.clear(); + Node simpContext2 = createSimpContext(iteNode, iteNode2, simpVar2); + if (!simpContext2.isNull()) { + Assert(!iteNode2.isNull()); + simpContext2 = simpContext.substitute(simpVar, simpContext2); + Node n = simpConstants(simpContext2, iteNode2, simpVar2); + if (n.isNull()) { + return n; + } + d_simpConstCache[pair(simpContext, iteNode)] = n; + return n; + } + return Node(); +} + + +Node ITESimplifier::getSimpVar(TypeNode t) +{ + std::hash_map::iterator it; + it = d_simpVars.find(t); + if (it != d_simpVars.end()) { + return (*it).second; + } + else { + Node var = NodeManager::currentNM()->mkSkolem("iteSimp_$$", t, "is a variable resulting from ITE simplification"); + d_simpVars[t] = var; + return var; + } +} + + +Node ITESimplifier::createSimpContext(TNode c, Node& iteNode, Node& simpVar) +{ + NodeMap::iterator it; + it = d_simpContextCache.find(c); + if (it != d_simpContextCache.end()) { + return (*it).second; + } + + if (!containsTermITE(c)) { + d_simpContextCache[c] = c; + return c; + } + + if (c.getKind() == kind::ITE && !c.getType().isBoolean()) { + // Currently only support one ite node in a simp context + // Return Null if more than one is found + if (!iteNode.isNull()) { + return Node(); + } + simpVar = getSimpVar(c.getType()); + if (simpVar.isNull()) { + return Node(); + } + d_simpContextCache[c] = simpVar; + iteNode = c; + return simpVar; + } + + NodeBuilder<> builder(c.getKind()); + if (c.getMetaKind() == kind::metakind::PARAMETERIZED) { + builder << c.getOperator(); + } + unsigned i = 0; + for (; i < c.getNumChildren(); ++ i) { + Node newChild = createSimpContext(c[i], iteNode, simpVar); + if (newChild.isNull()) { + return newChild; + } + builder << newChild; + } + // Mark the substitution and continue + Node result = builder; + d_simpContextCache[c] = result; + return result; +} +typedef std::hash_set NodeSet; +void countReachable_(Node x, Kind k, NodeSet& visited, uint32_t& reached){ + if(visited.find(x) != visited.end()){ + return; + } + visited.insert(x); + if(x.getKind() == k){ + ++reached; + } + for(unsigned i =0, N=x.getNumChildren(); i < N; ++i){ + countReachable_(x[i], k, visited, reached); + } +} + +uint32_t countReachable(TNode x, Kind k){ + NodeSet visited; + uint32_t reached = 0; + countReachable_(x, k, visited, reached); + return reached; +} + +Node ITESimplifier::simpITEAtom(TNode atom) +{ + static int CVC4_UNUSED instance = 0; + Debug("ite::atom") << "still simplifying " << (++instance) << endl; + Node attempt = transformAtom(atom); + Debug("ite::atom") << " finished " << instance << endl; + if(!attempt.isNull()){ + Node rewritten = Rewriter::rewrite(attempt); + Debug("ite::print-success") + << instance << " " + << "rewriting " << countReachable(rewritten, kind::ITE) + << " from " << countReachable(atom, kind::ITE) << endl + << "\t rewritten " << rewritten << endl + << "\t input " << atom << endl; + return rewritten; + } + + if (leavesAreConst(atom)) { + Node iteNode; + Node simpVar; + d_simpContextCache.clear(); + Node simpContext = createSimpContext(atom, iteNode, simpVar); + if (!simpContext.isNull()) { + if (iteNode.isNull()) { + Assert(leavesAreConst(simpContext) && !containsTermITE(simpContext)); + ++(d_statistics.d_unexpected); + Debug("ite::simpite") << instance << " " + << "how about?" << atom << endl; + Debug("ite::simpite") << instance << " " + << "\t" << simpContext << endl; + return Rewriter::rewrite(simpContext); + } + Node n = simpConstants(simpContext, iteNode, simpVar); + if (!n.isNull()) { + ++(d_statistics.d_unexpected); + Debug("ite::simpite") << instance << " " + << "here?" << atom << endl; + Debug("ite::simpite") << instance << " " + << "\t" << n << endl; + return n; + } + } + } + if(Debug.isOn("ite::simpite")){ + if(countReachable(atom, kind::ITE) > 0){ + Debug("ite::simpite") << instance << " " + << "remaining " << atom << endl; + } + } + ++(d_statistics.d_unsimplified); + return atom; +} + + +struct preprocess_stack_element { + TNode node; + bool children_added; + preprocess_stack_element(TNode node) + : node(node), children_added(false) {} +};/* struct preprocess_stack_element */ + + +Node ITESimplifier::simpITE(TNode assertion) +{ + // Do a topological sort of the subexpressions and substitute them + vector toVisit; + toVisit.push_back(assertion); + + static int call = 0; + ++call; + int iteration = 0; + + while (!toVisit.empty()) + { + iteration ++; + //cout << "call " << call << " : " << iteration << endl; + // The current node we are processing + preprocess_stack_element& stackHead = toVisit.back(); + TNode current = stackHead.node; + + // If node has no ITE's or already in the cache we're done, pop from the stack + if (current.getNumChildren() == 0 || + (Theory::theoryOf(current) != THEORY_BOOL && !containsTermITE(current))) { + d_simpITECache[current] = current; + ++(d_statistics.d_simpITEVisits); + toVisit.pop_back(); + continue; + } + + NodeMap::iterator find = d_simpITECache.find(current); + if (find != d_simpITECache.end()) { + toVisit.pop_back(); + continue; + } + + // Not yet substituted, so process + if (stackHead.children_added) { + // Children have been processed, so substitute + NodeBuilder<> builder(current.getKind()); + if (current.getMetaKind() == kind::metakind::PARAMETERIZED) { + builder << current.getOperator(); + } + for (unsigned i = 0; i < current.getNumChildren(); ++ i) { + Assert(d_simpITECache.find(current[i]) != d_simpITECache.end()); + Node child = current[i]; + Node childRes = d_simpITECache[current[i]]; + builder << childRes; + } + // Mark the substitution and continue + Node result = builder; + + // If this is an atom, we process it + if (Theory::theoryOf(result) != THEORY_BOOL && + result.getType().isBoolean()) { + result = simpITEAtom(result); + } + + // if(current != result && result.isConst()){ + // static int instance = 0; + // //cout << instance << " " << result << current << endl; + // } + + result = Rewriter::rewrite(result); + d_simpITECache[current] = result; + ++(d_statistics.d_simpITEVisits); + toVisit.pop_back(); + } else { + // Mark that we have added the children if any + if (current.getNumChildren() > 0) { + stackHead.children_added = true; + // We need to add the children + for(TNode::iterator child_it = current.begin(); child_it != current.end(); ++ child_it) { + TNode childNode = *child_it; + NodeMap::iterator childFind = d_simpITECache.find(childNode); + if (childFind == d_simpITECache.end()) { + toVisit.push_back(childNode); + } + } + } else { + // No children, so we're done + d_simpITECache[current] = current; + ++(d_statistics.d_simpITEVisits); + toVisit.pop_back(); + } + } + } + return d_simpITECache[assertion]; +} + +ITECareSimplifier::ITECareSimplifier() + : d_usedSets() +{ + d_true = NodeManager::currentNM()->mkConst(true); + d_false = NodeManager::currentNM()->mkConst(false); +} + +ITECareSimplifier::~ITECareSimplifier(){} + +void ITECareSimplifier::clear(){ + d_usedSets.clear(); +} + +ITECareSimplifier::CareSetPtr ITECareSimplifier::getNewSet() +{ + if (d_usedSets.empty()) { + return ITECareSimplifier::CareSetPtr::mkNew(*this); + } + else { + ITECareSimplifier::CareSetPtr cs = ITECareSimplifier::CareSetPtr::recycle(d_usedSets.back()); + cs.getCareSet().clear(); + d_usedSets.pop_back(); + return cs; + } +} + + +void ITECareSimplifier::updateQueue(CareMap& queue, + TNode e, + ITECareSimplifier::CareSetPtr& careSet) +{ + CareMap::iterator it = queue.find(e), iend = queue.end(); + if (it != iend) { + set& cs2 = (*it).second.getCareSet(); + ITECareSimplifier::CareSetPtr csNew = getNewSet(); + set_intersection(careSet.getCareSet().begin(), + careSet.getCareSet().end(), + cs2.begin(), cs2.end(), + inserter(csNew.getCareSet(), csNew.getCareSet().begin())); + (*it).second = csNew; + } + else { + queue[e] = careSet; + } +} + + +Node ITECareSimplifier::substitute(TNode e, TNodeMap& substTable, TNodeMap& cache) +{ + TNodeMap::iterator it = cache.find(e), iend = cache.end(); + if (it != iend) { + return it->second; + } + + // do substitution? + it = substTable.find(e); + iend = substTable.end(); + if (it != iend) { + Node result = substitute(it->second, substTable, cache); + cache[e] = result; + return result; + } + + size_t sz = e.getNumChildren(); + if (sz == 0) { + cache[e] = e; + return e; + } + + NodeBuilder<> builder(e.getKind()); + if (e.getMetaKind() == kind::metakind::PARAMETERIZED) { + builder << e.getOperator(); + } + for (unsigned i = 0; i < e.getNumChildren(); ++ i) { + builder << substitute(e[i], substTable, cache); + } + + Node result = builder; + // it = substTable.find(result); + // if (it != iend) { + // result = substitute(it->second, substTable, cache); + // } + cache[e] = result; + return result; +} + + +Node ITECareSimplifier::simplifyWithCare(TNode e) +{ + TNodeMap substTable; + CareMap queue; + CareMap::iterator it; + ITECareSimplifier::CareSetPtr cs = getNewSet(); + ITECareSimplifier::CareSetPtr cs2; + queue[e] = cs; + + TNode v; + bool done; + unsigned i; + + while (!queue.empty()) { + it = queue.end(); + --it; + v = it->first; + cs = it->second; + set& css = cs.getCareSet(); + queue.erase(v); + + done = false; + set::iterator iCare, iCareEnd = css.end(); + + switch (v.getKind()) { + case kind::ITE: { + iCare = css.find(v[0]); + if (iCare != iCareEnd) { + Assert(substTable.find(v) == substTable.end()); + substTable[v] = v[1]; + updateQueue(queue, v[1], cs); + done = true; + break; + } + else { + iCare = css.find(v[0].negate()); + if (iCare != iCareEnd) { + Assert(substTable.find(v) == substTable.end()); + substTable[v] = v[2]; + updateQueue(queue, v[2], cs); + done = true; + break; + } + } + updateQueue(queue, v[0], cs); + cs2 = getNewSet(); + cs2.getCareSet() = css; + cs2.getCareSet().insert(v[0]); + updateQueue(queue, v[1], cs2); + cs2 = getNewSet(); + cs2.getCareSet() = css; + cs2.getCareSet().insert(v[0].negate()); + updateQueue(queue, v[2], cs2); + done = true; + break; + } + case kind::AND: { + for (i = 0; i < v.getNumChildren(); ++i) { + iCare = css.find(v[i].negate()); + if (iCare != iCareEnd) { + Assert(substTable.find(v) == substTable.end()); + substTable[v] = d_false; + done = true; + break; + } + } + if (done) break; + + Assert(v.getNumChildren() > 1); + updateQueue(queue, v[0], cs); + cs2 = getNewSet(); + cs2.getCareSet() = css; + cs2.getCareSet().insert(v[0]); + for (i = 1; i < v.getNumChildren(); ++i) { + updateQueue(queue, v[i], cs2); + } + done = true; + break; + } + case kind::OR: { + for (i = 0; i < v.getNumChildren(); ++i) { + iCare = css.find(v[i]); + if (iCare != iCareEnd) { + Assert(substTable.find(v) == substTable.end()); + substTable[v] = d_true; + done = true; + break; + } + } + if (done) break; + + Assert(v.getNumChildren() > 1); + updateQueue(queue, v[0], cs); + cs2 = getNewSet(); + cs2.getCareSet() = css; + cs2.getCareSet().insert(v[0].negate()); + for (i = 1; i < v.getNumChildren(); ++i) { + updateQueue(queue, v[i], cs2); + } + done = true; + break; + } + default: + break; + } + + if (done) { + continue; + } + + for (unsigned i = 0; i < v.getNumChildren(); ++i) { + updateQueue(queue, v[i], cs); + } + } + while (!d_usedSets.empty()) { + delete d_usedSets.back(); + d_usedSets.pop_back(); + } + + TNodeMap cache; + return substitute(e, substTable, cache); +} + + +} /* namespace theory */ +} /* namespace CVC4 */ diff --git a/src/theory/ite_utilities.h b/src/theory/ite_utilities.h new file mode 100644 index 000000000..73f0386d2 --- /dev/null +++ b/src/theory/ite_utilities.h @@ -0,0 +1,373 @@ +/********************* */ +/*! \file ite_simplifier.h + ** \verbatim + ** Original author: Clark Barrett + ** Major contributors: none + ** Minor contributors (to current version): Morgan Deters + ** This file is part of the CVC4 project. + ** Copyright (c) 2009-2013 New York University and The University of Iowa + ** See the file COPYING in the top-level source directory for licensing + ** information.\endverbatim + ** + ** \brief Simplifications for ITE expressions + ** + ** This module implements preprocessing phases designed to simplify ITE + ** expressions. Based on: + ** Kim, Somenzi, Jin. Efficient Term-ITE Conversion for SMT. FMCAD 2009. + ** Burch, Jerry. Techniques for Verifying Superscalar Microprocessors. DAC '96 + **/ + +#include "cvc4_private.h" + +#ifndef __CVC4__ITE_UTILITIES_H +#define __CVC4__ITE_UTILITIES_H + +#include +#include +#include +#include "expr/node.h" +#include "util/statistics_registry.h" + +namespace CVC4 { +namespace theory { + +class ContainsTermITEVistor; +class IncomingArcCounter; +class TermITEHeightCounter; +class ITECompressor; +class ITESimplifier; +class ITECareSimplifier; + +class ITEUtilities { +public: + ITEUtilities(ContainsTermITEVistor* containsVisitor); + ~ITEUtilities(); + + Node simpITE(TNode assertion); + + bool simpIteDidALotOfWorkHeuristic() const; + + /* returns false if an assertion is discovered to be equal to false. */ + bool compress(std::vector& assertions); + + Node simplifyWithCare(TNode e); + + void clear(); + +private: + ContainsTermITEVistor* d_containsVisitor; + ITECompressor* d_compressor; + ITESimplifier* d_simplifier; + ITECareSimplifier* d_careSimp; +}; + +/** + * A caching visitor that computes whether a node contains a term ite. + */ +class ContainsTermITEVistor { +public: + ContainsTermITEVistor(); + ~ContainsTermITEVistor(); + + /** returns true if a node contains a term ite. */ + bool containsTermITE(TNode n); + + /** Garbage collects the cache. */ + void garbageCollect(); + + /** returns the size of the cache. */ + size_t cache_size() const { return d_cache.size(); } + +private: + typedef std::hash_map NodeBoolMap; + NodeBoolMap d_cache; +}; + +class IncomingArcCounter { +public: + IncomingArcCounter(bool skipVars = false, bool skipConstants = false); + ~IncomingArcCounter(); + void computeReachability(const std::vector& assertions); + + inline uint32_t lookupIncoming(Node n) const { + NodeCountMap::const_iterator it = d_reachCount.find(n); + if(it == d_reachCount.end()){ + return 0; + }else{ + return (*it).second; + } + } + void clear(); +private: + typedef std::hash_map NodeCountMap; + NodeCountMap d_reachCount; + + bool d_skipVariables; + bool d_skipConstants; +}; + +class TermITEHeightCounter { +public: + TermITEHeightCounter(); + ~TermITEHeightCounter(); + + /** + * Compute and [potentially] cache the termITEHeight() of e. + * The term ite height equals the maximum number of term ites + * encountered on any path from e to a leaf. + * Inductively: + * - termITEHeight(leaves) = 0 + * - termITEHeight(e: term-ite(c, t, e) ) = + * 1 + max(termITEHeight(t), termITEHeight(e)) ; Don't include c + * - termITEHeight(e not term ite) = max_{c in children(e)) (termITEHeight(c)) + */ + uint32_t termITEHeight(TNode e); + + /** Clear the cache. */ + void clear(); + + /** Size of the cache. */ + size_t cache_size() const; + +private: + typedef std::hash_map NodeCountMap; + NodeCountMap d_termITEHeight; +}; + +/** + * A routine designed to undo the potentially large blow up + * due to expansion caused by the ite simplifier. + */ +class ITECompressor { +public: + ITECompressor(ContainsTermITEVistor* contains); + ~ITECompressor(); + + /* returns false if an assertion is discovered to be equal to false. */ + bool compress(std::vector& assertions); + + /* garbage Collects the compressor. */ + void garbageCollect(); + +private: + + Node d_true; /* Copy of true. */ + Node d_false; /* Copy of false. */ + ContainsTermITEVistor* d_contains; + std::vector* d_assertions; + IncomingArcCounter d_incoming; + + typedef std::hash_map NodeMap; + NodeMap d_compressed; + + void reset(); + + Node push_back_boolean(Node original, Node compressed); + bool multipleParents(TNode c); + Node compressBooleanITEs(Node toCompress); + Node compressTerm(Node toCompress); + Node compressBoolean(Node toCompress); + + class Statistics { + public: + IntStat d_compressCalls; + IntStat d_skolemsAdded; + Statistics(); + ~Statistics(); + }; + Statistics d_statistics; +}; + +class ITESimplifier { +public: + ITESimplifier(ContainsTermITEVistor* d_containsVisitor); + ~ITESimplifier(); + + Node simpITE(TNode assertion); + + bool doneALotOfWorkHeuristic() const; + void clearSimpITECaches(); + +private: + Node d_true; + Node d_false; + + ContainsTermITEVistor* d_containsVisitor; + inline bool containsTermITE(TNode n) { + return d_containsVisitor->containsTermITE(n); + } + TermITEHeightCounter d_termITEHeight; + inline uint32_t termITEHeight(TNode e) { + return d_termITEHeight.termITEHeight(e); + } + + // ConstantIte is a small inductive sublanguage: + // constant + // or termITE(cnd, ConstantIte, ConstantIte) + typedef std::vector NodeVec; + typedef std::hash_map ConstantLeavesMap; + ConstantLeavesMap d_constantLeaves; + + // d_constantLeaves satisfies the following invariants: + // not containsTermITE(x) then !isKey(x) + // containsTermITE(x): + // - not isKey(x) then this value is uncomputed + // - d_constantLeaves[x] == NULL, then this contains a non-constant leaf + // - d_constantLeaves[x] != NULL, then this contains a sorted list of constant leaf + bool isConstantIte(TNode e); + + /** If its not a constant and containsTermITE(ite), + * returns a sorted NodeVec of the leaves. */ + NodeVec* computeConstantLeaves(TNode ite); + + // Lists all of the vectors in d_constantLeaves for fast deletion. + std::vector d_allocatedConstantLeaves; + + + /* transforms */ + Node transformAtom(TNode atom); + Node attemptConstantRemoval(TNode atom); + Node attemptLiftEquality(TNode atom); + Node attemptEagerRemoval(TNode atom); + + // Given ConstantIte trees lcite and rcite, + // return a boolean expression equivalent to (= lcite rcite) + Node intersectConstantIte(TNode lcite, TNode rcite); + + // Given ConstantIte tree cite and a constant c, + // return a boolean expression equivalent to (= lcite c) + Node constantIteEqualsConstant(TNode cite, TNode c); + uint32_t d_citeEqConstApplications; + + typedef std::pair NodePair; + struct NodePairHashFunction { + size_t operator () (const NodePair& pair) const { + size_t hash = 0; + hash = 0x9e3779b9 + NodeHashFunction().operator()(pair.first); + hash ^= 0x9e3779b9 + NodeHashFunction().operator()(pair.second) + (hash << 6) + (hash >> 2); + return hash; + } + };/* struct ITESimplifier::NodePairHashFunction */ + typedef std::hash_map NodePairMap; + NodePairMap d_constantIteEqualsConstantCache; + NodePairMap d_replaceOverCache; + NodePairMap d_replaceOverTermIteCache; + Node replaceOver(Node n, Node replaceWith, Node simpVar); + Node replaceOverTermIte(Node term, Node simpAtom, Node simpVar); + + std::hash_map d_leavesConstCache; + bool leavesAreConst(TNode e, theory::TheoryId tid); + bool leavesAreConst(TNode e); + + NodePairMap d_simpConstCache; + Node simpConstants(TNode simpContext, TNode iteNode, TNode simpVar); + std::hash_map d_simpVars; + Node getSimpVar(TypeNode t); + + typedef std::hash_map NodeMap; + NodeMap d_simpContextCache; + Node createSimpContext(TNode c, Node& iteNode, Node& simpVar); + + NodeMap d_simpITECache; + Node simpITEAtom(TNode atom); + + +private: + class Statistics { + public: + IntStat d_maxNonConstantsFolded; + IntStat d_unexpected; + IntStat d_unsimplified; + IntStat d_exactMatchFold; + IntStat d_binaryPredFold; + IntStat d_specialEqualityFolds; + IntStat d_simpITEVisits; + + HistogramStat d_inSmaller; + + Statistics(); + ~Statistics(); + }; + + Statistics d_statistics; +}; + +class ITECareSimplifier { +public: + ITECareSimplifier(); + ~ITECareSimplifier(); + + Node simplifyWithCare(TNode e); + + void clear(); +private: + Node d_true; + Node d_false; + + typedef std::hash_map TNodeMap; + + class CareSetPtr; + class CareSetPtrVal { + friend class ITECareSimplifier::CareSetPtr; + ITECareSimplifier& d_iteSimplifier; + unsigned d_refCount; + std::set d_careSet; + CareSetPtrVal(ITECareSimplifier& simp) : d_iteSimplifier(simp), d_refCount(1) {} + }; + + std::vector d_usedSets; + void careSetPtrGC(CareSetPtrVal* val) { + d_usedSets.push_back(val); + } + + class CareSetPtr { + CareSetPtrVal* d_val; + CareSetPtr(CareSetPtrVal* val) : d_val(val) {} + public: + CareSetPtr() : d_val(NULL) {} + CareSetPtr(const CareSetPtr& cs) { + d_val = cs.d_val; + if (d_val != NULL) { + ++(d_val->d_refCount); + } + } + ~CareSetPtr() { + if (d_val != NULL && (--(d_val->d_refCount) == 0)) { + d_val->d_iteSimplifier.careSetPtrGC(d_val); + } + } + CareSetPtr& operator=(const CareSetPtr& cs) { + if (d_val != cs.d_val) { + if (d_val != NULL && (--(d_val->d_refCount) == 0)) { + d_val->d_iteSimplifier.careSetPtrGC(d_val); + } + d_val = cs.d_val; + if (d_val != NULL) { + ++(d_val->d_refCount); + } + } + return *this; + } + std::set& getCareSet() { return d_val->d_careSet; } + static CareSetPtr mkNew(ITECareSimplifier& simp) { + CareSetPtrVal* val = new CareSetPtrVal(simp); + return CareSetPtr(val); + } + static CareSetPtr recycle(CareSetPtrVal* val) { + Assert(val != NULL && val->d_refCount == 0); + val->d_refCount = 1; + return CareSetPtr(val); + } + }; + + CareSetPtr getNewSet(); + + typedef std::map CareMap; + void updateQueue(CareMap& queue, TNode e, CareSetPtr& careSet); + Node substitute(TNode e, TNodeMap& substTable, TNodeMap& cache); +}; + +}/* CVC4::theory namespace */ +}/* CVC4 namespace */ + +#endif diff --git a/src/theory/model.h b/src/theory/model.h index a18d66ab0..8192274b5 100644 --- a/src/theory/model.h +++ b/src/theory/model.h @@ -22,7 +22,6 @@ #include "theory/rep_set.h" #include "theory/substitutions.h" #include "theory/type_enumerator.h" -#include "theory/ite_simplifier.h" namespace CVC4 { @@ -38,7 +37,6 @@ class TheoryModel : public Model protected: /** substitution map for this model */ SubstitutionMap d_substitutions; - ITESimplifier d_iteSimp; public: TheoryModel(context::Context* c, std::string name, bool enableFuncModels); virtual ~TheoryModel(){} diff --git a/src/theory/theory_engine.cpp b/src/theory/theory_engine.cpp index 84bbbc179..93b3f0d7e 100644 --- a/src/theory/theory_engine.cpp +++ b/src/theory/theory_engine.cpp @@ -35,6 +35,11 @@ #include "util/node_visitor.h" #include "util/ite_removal.h" +//#include "theory/ite_simplifier.h" +//#include "theory/ite_compressor.h" +#include "theory/ite_utilities.h" +#include "theory/unconstrained_simplifier.h" + #include "theory/model.h" #include "theory/quantifiers_engine.h" #include "theory/quantifiers/theory_quantifiers.h" @@ -122,7 +127,7 @@ TheoryEngine::TheoryEngine(context::Context* context, d_factsAsserted(context, false), d_preRegistrationVisitor(this, context), d_sharedTermsVisitor(d_sharedTerms), - d_unconstrainedSimp(context, logicInfo), + d_unconstrainedSimp(new UnconstrainedSimplifier(context, logicInfo)), d_bvToBoolPreprocessor() { for(TheoryId theoryId = theory::THEORY_FIRST; theoryId != theory::THEORY_LAST; ++ theoryId) { @@ -140,7 +145,9 @@ TheoryEngine::TheoryEngine(context::Context* context, StatisticsRegistry::registerStat(&d_combineTheoriesTime); d_true = NodeManager::currentNM()->mkConst(true); d_false = NodeManager::currentNM()->mkConst(false); - PROOF (ProofManager::currentPM()->initTheoryProof(); ); + PROOF (ProofManager::currentPM()->initTheoryProof(); ); + + d_iteUtilities = new ITEUtilities(d_iteRemover.getContainsVisitor()); } TheoryEngine::~TheoryEngine() { @@ -161,6 +168,10 @@ TheoryEngine::~TheoryEngine() { delete d_masterEqualityEngine; StatisticsRegistry::unregisterStat(&d_combineTheoriesTime); + + delete d_unconstrainedSimp; + + delete d_iteUtilities; } void TheoryEngine::interrupt() throw(ModalException) { @@ -1401,9 +1412,48 @@ void TheoryEngine::ppBvToBool(const std::vector& assertions, std::vectorsimpITE(assertion); + Node res_rewritten = Rewriter::rewrite(result); + + if(options::simplifyWithCareEnabled()){ + Chat() << "starting simplifyWithCare()" << endl; + Node postSimpWithCare = d_iteUtilities->simplifyWithCare(res_rewritten); + Chat() << "ending simplifyWithCare()" + << " post simplifyWithCare()" << postSimpWithCare.getId() << endl; + result = Rewriter::rewrite(postSimpWithCare); + }else{ + result = res_rewritten; + } + + return result; + } +} + +bool TheoryEngine::donePPSimpITE(std::vector& assertions){ + bool result = true; + if(d_iteUtilities->simpIteDidALotOfWorkHeuristic()){ + if(options::compressItes()){ + result = d_iteUtilities->compress(assertions); + } + + if(result){ + // if false, don't bother to reclaim memory here. + NodeManager* nm = NodeManager::currentNM(); + if(nm->poolSize() >= options::zombieHuntThreshold()){ + Chat() << "..ite simplifier did quite a bit of work.. " << nm->poolSize() << endl; + Chat() << "....node manager contains " << nm->poolSize() << " nodes before cleanup" << endl; + d_iteUtilities->clear(); + Rewriter::garbageCollect(); + d_iteRemover.garbageCollect(); + nm->reclaimZombiesUntil(options::zombieHuntThreshold()); + Chat() << "....node manager contains " << nm->poolSize() << " nodes after cleanup" << endl; + } + } + } return result; } @@ -1481,7 +1531,7 @@ void TheoryEngine::getExplanation(std::vector& explanationVector void TheoryEngine::ppUnconstrainedSimp(vector& assertions) { - d_unconstrainedSimp.processAssertions(assertions); + d_unconstrainedSimp->processAssertions(assertions); } diff --git a/src/theory/theory_engine.h b/src/theory/theory_engine.h index 53ff4d167..e5b2ad8d2 100644 --- a/src/theory/theory_engine.h +++ b/src/theory/theory_engine.h @@ -37,12 +37,8 @@ #include "options/options.h" #include "smt/options.h" #include "util/statistics_registry.h" -#include "util/hash.h" -#include "util/cache.h" #include "util/cvc4_assert.h" #include "util/sort_inference.h" -#include "theory/ite_simplifier.h" -#include "theory/unconstrained_simplifier.h" #include "theory/uf/equality_engine.h" #include "theory/bv/bv_to_bool.h" #include "theory/atom_requests.h" @@ -77,18 +73,19 @@ struct NodeTheoryPairHashFunction { - +/* Forward Declarations Block */ namespace theory { class TheoryModel; class TheoryEngineModelBuilder; + class ITEUtilities; namespace eq { class EqualityEngine; } }/* CVC4::theory namespace */ - - class DecisionEngine; +class RemoveITE; +class UnconstrainedSimplifier; /** * This is essentially an abstraction for a collection of theories. A @@ -771,11 +768,14 @@ private: /** Dump the assertions to the dump */ void dumpAssertions(const char* tag); - /** For preprocessing pass simplifying ITEs */ - theory::ITESimplifier d_iteSimplifier; + /** + * A collection of ite preprocessing passes. + */ + theory::ITEUtilities* d_iteUtilities; + /** For preprocessing pass simplifying unconstrained expressions */ - UnconstrainedSimplifier d_unconstrainedSimp; + UnconstrainedSimplifier* d_unconstrainedSimp; /** For preprocessing pass lifting bit-vectors of size 1 to booleans */ theory::bv::BvToBoolPreprocessor d_bvToBoolPreprocessor; @@ -783,6 +783,9 @@ public: void ppBvToBool(const std::vector& assertions, std::vector& new_assertions); Node ppSimpITE(TNode assertion); + /** Returns false if an assertion simplified to false. */ + bool donePPSimpITE(std::vector& assertions); + void ppUnconstrainedSimp(std::vector& assertions); SharedTermsDatabase* getSharedTermsDatabase() { return &d_sharedTerms; } diff --git a/src/theory/unconstrained_simplifier.cpp b/src/theory/unconstrained_simplifier.cpp index 9b172a561..8bbdded3e 100644 --- a/src/theory/unconstrained_simplifier.cpp +++ b/src/theory/unconstrained_simplifier.cpp @@ -18,6 +18,7 @@ #include "theory/unconstrained_simplifier.h" #include "theory/rewriter.h" +#include "theory/logic_info.h" using namespace std; using namespace CVC4; diff --git a/src/theory/unconstrained_simplifier.h b/src/theory/unconstrained_simplifier.h index 7d8e85036..0ee754256 100644 --- a/src/theory/unconstrained_simplifier.h +++ b/src/theory/unconstrained_simplifier.h @@ -24,11 +24,14 @@ #include #include "expr/node.h" -#include "theory/theory.h" #include "theory/substitutions.h" +#include "util/statistics_registry.h" namespace CVC4 { +/* Forward Declarations */ +class LogicInfo; + class UnconstrainedSimplifier { /** number of expressions eliminated due to unconstrained simplification */ diff --git a/src/util/Makefile.am b/src/util/Makefile.am index 156288600..5647a2057 100644 --- a/src/util/Makefile.am +++ b/src/util/Makefile.am @@ -76,6 +76,8 @@ libutil_la_SOURCES = \ boolean_simplification.cpp \ ite_removal.h \ ite_removal.cpp \ + nary_builder.h \ + nary_builder.cpp \ node_visitor.h \ chain.h \ index.h \ diff --git a/src/util/ite_removal.cpp b/src/util/ite_removal.cpp index 7d4948251..5231e05c2 100644 --- a/src/util/ite_removal.cpp +++ b/src/util/ite_removal.cpp @@ -17,15 +17,37 @@ #include #include "util/ite_removal.h" -#include "theory/rewriter.h" #include "expr/command.h" #include "theory/quantifiers/options.h" +#include "theory/ite_utilities.h" using namespace CVC4; using namespace std; namespace CVC4 { +RemoveITE::RemoveITE(context::UserContext* u) + : d_iteCache(u) +{ + d_containsVisitor = new theory::ContainsTermITEVistor(); +} + +RemoveITE::~RemoveITE(){ + delete d_containsVisitor; +} + +void RemoveITE::garbageCollect(){ + d_containsVisitor->garbageCollect(); +} + +theory::ContainsTermITEVistor* RemoveITE::getContainsVisitor(){ + return d_containsVisitor; +} + +size_t RemoveITE::collectedCacheSizes() const{ + return d_containsVisitor->cache_size() + d_iteCache.size(); +} + void RemoveITE::run(std::vector& output, IteSkolemMap& iteSkolemMap) { for (unsigned i = 0, i_end = output.size(); i < i_end; ++ i) { @@ -38,18 +60,28 @@ void RemoveITE::run(std::vector& output, IteSkolemMap& iteSkolemMap) } } +bool RemoveITE::containsTermITE(TNode e){ + return d_containsVisitor->containsTermITE(e); +} + Node RemoveITE::run(TNode node, std::vector& output, - IteSkolemMap& iteSkolemMap, std::vector& quantVar) { + IteSkolemMap& iteSkolemMap, + std::vector& quantVar) { // Current node Debug("ite") << "removeITEs(" << node << ")" << endl; + if(node.isVar() || node.isConst() || + (options::biasedITERemoval() && !containsTermITE(node))){ + return Node(node); + } + // The result may be cached already NodeManager *nodeManager = NodeManager::currentNM(); - ITECache::iterator i = d_iteCache.find(node); + ITECache::const_iterator i = d_iteCache.find(node); if(i != d_iteCache.end()) { - Node cachedRewrite = (*i).second; - Debug("ite") << "removeITEs: in-cache: " << cachedRewrite << endl; - return cachedRewrite.isNull() ? Node(node) : cachedRewrite; + Node cached = (*i).second; + Debug("ite") << "removeITEs: in-cache: " << cached << endl; + return cached.isNull() ? Node(node) : cached; } // If an ITE replace it @@ -81,7 +113,7 @@ Node RemoveITE::run(TNode node, std::vector& output, Debug("ite") << "removeITEs(" << node << ") => " << newAssertion << endl; // Attach the skolem - d_iteCache[node] = skolem; + d_iteCache.insert(node, skolem); // Remove ITEs from the new assertion, rewrite it and push it to the output newAssertion = run(newAssertion, output, iteSkolemMap, quantVar); @@ -127,17 +159,18 @@ Node RemoveITE::run(TNode node, std::vector& output, // If changes, we rewrite if(somethingChanged) { - Node cachedRewrite = nodeManager->mkNode(node.getKind(), newChildren); - d_iteCache[node] = cachedRewrite; - return cachedRewrite; + Node cached = nodeManager->mkNode(node.getKind(), newChildren); + d_iteCache.insert(node, cached); + return cached; } else { - d_iteCache[node] = Node::null(); + d_iteCache.insert(node, Node::null()); return node; } } else { - d_iteCache[node] = Node::null(); + d_iteCache.insert(node, Node::null()); return node; } } + }/* CVC4 namespace */ diff --git a/src/util/ite_removal.h b/src/util/ite_removal.h index 03197be89..9d79687f4 100644 --- a/src/util/ite_removal.h +++ b/src/util/ite_removal.h @@ -22,21 +22,25 @@ #include "expr/node.h" #include "util/dump.h" #include "context/context.h" -#include "context/cdhashmap.h" +#include "context/cdinsert_hashmap.h" namespace CVC4 { +namespace theory { +class ContainsTermITEVistor; +} + typedef std::hash_map IteSkolemMap; class RemoveITE { - typedef context::CDHashMap ITECache; + typedef context::CDInsertHashMap ITECache; ITECache d_iteCache; + public: - RemoveITE(context::UserContext* u) : - d_iteCache(u) { - } + RemoveITE(context::UserContext* u); + ~RemoveITE(); /** * Removes the ITE nodes by introducing skolem variables. All @@ -57,6 +61,21 @@ public: Node run(TNode node, std::vector& additionalAssertions, IteSkolemMap& iteSkolemMap, std::vector& quantVar); + /** Returns true if e contains a term ite.*/ + bool containsTermITE(TNode e); + + /** Returns the collected size of the caches.*/ + size_t collectedCacheSizes() const; + + /** Garbage collects non-context dependent data-structures.*/ + void garbageCollect(); + + /** Return the RemoveITE's containsVisitor.*/ + theory::ContainsTermITEVistor* getContainsVisitor(); + +private: + theory::ContainsTermITEVistor* d_containsVisitor; + };/* class RemoveTTE */ }/* CVC4 namespace */ diff --git a/src/util/nary_builder.cpp b/src/util/nary_builder.cpp new file mode 100644 index 000000000..004dd3382 --- /dev/null +++ b/src/util/nary_builder.cpp @@ -0,0 +1,183 @@ + +#include "util/nary_builder.h" +#include "expr/metakind.h" +using namespace std; + +namespace CVC4 { +namespace util { + +Node NaryBuilder::mkAssoc(Kind kind, const std::vector& children){ + if(children.size() == 0){ + return zeroArity(kind); + }else if(children.size() == 1){ + return children[0]; + }else{ + const unsigned int max = kind::metakind::getUpperBoundForKind(kind); + const unsigned int min = kind::metakind::getLowerBoundForKind(kind); + + Assert(min <= children.size()); + + unsigned int numChildren = children.size(); + NodeManager* nm = NodeManager::currentNM(); + if( numChildren <= max ) { + return nm->mkNode(kind,children); + } + + typedef std::vector::const_iterator const_iterator; + const_iterator it = children.begin() ; + const_iterator end = children.end() ; + + /* The new top-level children and the children of each sub node */ + std::vector newChildren; + std::vector subChildren; + + while( it != end && numChildren > max ) { + /* Grab the next max children and make a node for them. */ + for(const_iterator next = it + max; it != next; ++it, --numChildren ) { + subChildren.push_back(*it); + } + Node subNode = nm->mkNode(kind,subChildren); + newChildren.push_back(subNode); + subChildren.clear(); + } + + /* If there's children left, "top off" the Expr. */ + if(numChildren > 0) { + /* If the leftovers are too few, just copy them into newChildren; + * otherwise make a new sub-node */ + if(numChildren < min) { + for(; it != end; ++it) { + newChildren.push_back(*it); + } + } else { + for(; it != end; ++it) { + subChildren.push_back(*it); + } + Node subNode = nm->mkNode(kind, subChildren); + newChildren.push_back(subNode); + } + } + + /* It's inconceivable we could have enough children for this to fail + * (more than 2^32, in most cases?). */ + AlwaysAssert( newChildren.size() <= max, + "Too many new children in mkAssociative" ); + + /* It would be really weird if this happened (it would require + * min > 2, for one thing), but let's make sure. */ + AlwaysAssert( newChildren.size() >= min, + "Too few new children in mkAssociative" ); + + return nm->mkNode(kind,newChildren); + } +} + +Node NaryBuilder::zeroArity(Kind k){ + using namespace kind; + NodeManager* nm = NodeManager::currentNM(); + switch(k){ + case AND: + return nm->mkConst(true); + case OR: + return nm->mkConst(false); + case PLUS: + return nm->mkConst(Rational(0)); + case MULT: + return nm->mkConst(Rational(1)); + default: + return Node::null(); + } +} + + +RePairAssocCommutativeOperators::RePairAssocCommutativeOperators() + : d_cache() +{} +RePairAssocCommutativeOperators::~RePairAssocCommutativeOperators(){} +size_t RePairAssocCommutativeOperators::size() const{ return d_cache.size(); } +void RePairAssocCommutativeOperators::clear(){ d_cache.clear(); } + +bool RePairAssocCommutativeOperators::isAssociateCommutative(Kind k){ + using namespace kind; + switch(k){ + case BITVECTOR_CONCAT: + case BITVECTOR_AND: + case BITVECTOR_OR: + case BITVECTOR_XOR: + case BITVECTOR_MULT: + case BITVECTOR_PLUS: + case DISTINCT: + case PLUS: + case MULT: + case AND: + case OR: + return true; + default: + return false; + } +} + +Node RePairAssocCommutativeOperators::rePairAssocCommutativeOperators(TNode n){ + if(d_cache.find(n) != d_cache.end()){ + return d_cache[n]; + } + Node result = + isAssociateCommutative(n.getKind()) ? + case_assoccomm(n) : case_other(n); + + d_cache[n] = result; + return result; +} + +Node RePairAssocCommutativeOperators::case_assoccomm(TNode n){ + Kind k = n.getKind(); + Assert(isAssociateCommutative(k)); + Assert(n.getMetaKind() != kind::metakind::PARAMETERIZED); + unsigned N = n.getNumChildren(); + Assert(N >= 2); + + + Node last = rePairAssocCommutativeOperators( n[N-1]); + Node nextToLast = rePairAssocCommutativeOperators(n[N-2]); + + NodeManager* nm = NodeManager::currentNM(); + Node last2 = nm->mkNode(k, nextToLast, last); + + if(N <= 2){ + return last2; + } else{ + Assert(N > 2); + Node prevRound = last2; + for(unsigned prevPos = N-2; prevPos > 0; --prevPos){ + unsigned currPos = prevPos-1; + Node curr = rePairAssocCommutativeOperators(n[currPos]); + Node round = nm->mkNode(k, curr, prevRound); + prevRound = round; + } + return prevRound; + } +} + +Node RePairAssocCommutativeOperators::case_other(TNode n){ + if(n.isConst() || n.isVar()){ + return n; + } + + NodeBuilder<> nb(n.getKind()); + + if(n.getMetaKind() == kind::metakind::PARAMETERIZED) { + nb << n.getOperator(); + } + + // Remove the ITEs from the children + for(TNode::const_iterator i = n.begin(), end = n.end(); i != end; ++i) { + Node newChild = rePairAssocCommutativeOperators(*i); + nb << newChild; + } + + Node result = (Node)nb; + return result; +} + +}/* util namespace */ +}/* CVC4 namespace */ diff --git a/src/util/nary_builder.h b/src/util/nary_builder.h new file mode 100644 index 000000000..ceaa44e77 --- /dev/null +++ b/src/util/nary_builder.h @@ -0,0 +1,38 @@ + +#include "cvc4_private.h" + +#pragma once + +#include +#include "expr/node.h" + +namespace CVC4{ +namespace util { + +class NaryBuilder { +public: + static Node mkAssoc(Kind k, const std::vector& children); + static Node zeroArity(Kind k); +};/* class NaryBuilder */ + +class RePairAssocCommutativeOperators { +public: + RePairAssocCommutativeOperators(); + ~RePairAssocCommutativeOperators(); + + Node rePairAssocCommutativeOperators(TNode n); + + static bool isAssociateCommutative(Kind k); + + size_t size() const; + void clear(); +private: + Node case_assoccomm(TNode n); + Node case_other(TNode n); + + typedef std::hash_map NodeMap; + NodeMap d_cache; +};/* class RePairAssocCommutativeOperators */ + +}/* util namespace */ +}/* CVC4 namespace */ diff --git a/test/regress/regress0/arith/Makefile.am b/test/regress/regress0/arith/Makefile.am index 6897ee3c4..ce6083363 100644 --- a/test/regress/regress0/arith/Makefile.am +++ b/test/regress/regress0/arith/Makefile.am @@ -45,7 +45,8 @@ TESTS = \ miplib2.cvc \ miplib3.cvc \ miplib4.cvc \ - miplibtrick.smt + miplibtrick.smt \ + prp-13-24.smt2 # problem__003.smt2 EXTRA_DIST = $(TESTS) \ diff --git a/test/regress/regress0/arith/prp-13-24.smt2 b/test/regress/regress0/arith/prp-13-24.smt2 new file mode 100644 index 000000000..b3b8e69b1 --- /dev/null +++ b/test/regress/regress0/arith/prp-13-24.smt2 @@ -0,0 +1,47 @@ +(set-logic QF_LIA) +(set-info :source |http://www.nec-labs.com/~fsoft/bench.html + The following changes have been made: + The logic is changed to QF_LIA. + The category is set as industrial. + The status (except 'large' cases) is assigned according to the 'outfile' on http://www.nec-labs.com/~fsoft/bench.html. |) +(set-info :smt-lib-version 2.0) +(set-info :category "industrial") +(set-info :status unsat) +(declare-fun i1430 () Int) +(declare-fun i1446 () Int) +(declare-fun i1474 () Int) +(declare-fun i1531 () Int) +(declare-fun i1589 () Int) +(declare-fun i1651 () Int) +(declare-fun i1727 () Int) +(declare-fun i1495 () Int) +(declare-fun i1874 () Int) +(declare-fun i2029 () Int) +(declare-fun i2201 () Int) +(declare-fun i2370 () Int) +(declare-fun i2560 () Int) +(declare-fun i1652 () Int) +(declare-fun i1875 () Int) +(declare-fun i1140 () Int) +(declare-fun i2747 () Int) +(declare-fun i2954 () Int) +(declare-fun i2030 () Int) +(declare-fun i2371 () Int) +(declare-fun i1728 () Int) +(declare-fun i2202 () Int) +(declare-fun i2561 () Int) +(declare-fun i2748 () Int) +(declare-fun i2955 () Int) +(declare-fun i3166 () Int) +(declare-fun i3389 () Int) +(declare-fun i3390 () Int) +(declare-fun i3642 () Int) +(declare-fun i3643 () Int) +(declare-fun i3915 () Int) +(declare-fun i3167 () Int) +(declare-fun i3916 () Int) +(declare-fun i4203 () Int) +(declare-fun i4204 () Int) +(assert (let ((?v_3 (+ 0 0))) (let ((?v_260 (= i1651 ?v_3)) (?v_261 (= i1874 ?v_3)) (?v_262 (= i2029 ?v_3)) (?v_263 (= i2201 ?v_3)) (?v_264 (= i2370 ?v_3)) (?v_265 (= i2560 ?v_3)) (?v_349 (= i2747 ?v_3)) (?v_413 (= i3166 ?v_3)) (?v_469 (= i3389 ?v_3)) (?v_561 (= i3642 ?v_3)) (?v_655 (= i3915 ?v_3)) (?v_751 (= i4203 ?v_3)) (?v_0 (not (= i1430 ?v_3)))) (let ((?v_1 (ite ?v_0 5 (ite ?v_0 3 41))) (?v_8 (+ 41 0))) (let ((?v_6 (= ?v_1 ?v_8)) (?v_2 (= ?v_1 (+ 5 0)))) (let ((?v_12 (ite (not ?v_6) 0 i1446)) (?v_4 (= (ite (not ?v_2) 0 i1446) ?v_3))) (let ((?v_7 (= ?v_12 ?v_3)) (?v_5 (ite ?v_2 7 (ite ?v_6 43 ?v_1))) (?v_10 (+ 43 0))) (let ((?v_9 (ite (= ?v_5 (+ 7 0)) (ite (not ?v_4) 8 (ite ?v_4 41 ?v_5)) (ite (not (= ?v_5 ?v_10)) ?v_5 (ite (not ?v_7) 46 (ite ?v_7 122 ?v_5))))) (?v_22 (+ 122 0))) (let ((?v_18 (= ?v_9 ?v_22)) (?v_20 (+ 46 0))) (let ((?v_16 (= ?v_9 ?v_20)) (?v_15 (= ?v_9 (+ 8 0))) (?v_11 (= ?v_9 ?v_8))) (let ((?v_59 (ite (not ?v_11) ?v_12 i1474)) (?v_31 (ite (not ?v_18) 0 i1474))) (let ((?v_13 (= ?v_59 ?v_3)) (?v_26 (ite ?v_15 i1474 (ite (not ?v_16) 0 i1474))) (?v_19 (= ?v_31 ?v_3))) (let ((?v_17 (<= 4 (+ ?v_26 0))) (?v_14 (ite ?v_11 43 (ite ?v_15 10 (ite ?v_16 48 (ite ?v_18 124 ?v_9))))) (?v_29 (+ 124 0)) (?v_24 (+ 48 0))) (let ((?v_75 (= ?v_14 (+ 10 0))) (?v_23 (not ?v_17))) (let ((?v_21 (ite (= ?v_14 ?v_10) (ite (not ?v_13) 46 (ite ?v_13 122 ?v_14)) (ite ?v_75 16 (ite (= ?v_14 ?v_24) (ite ?v_23 50 (ite ?v_17 122 ?v_14)) (ite (not (= ?v_14 ?v_29)) ?v_14 (ite (not ?v_19) 125 (ite ?v_19 205 ?v_14))))))) (?v_39 (+ 205 0))) (let ((?v_35 (= ?v_21 ?v_39)) (?v_38 (+ 125 0))) (let ((?v_40 (= ?v_21 ?v_38)) (?v_37 (+ 50 0))) (let ((?v_33 (= ?v_21 ?v_37)) (?v_30 (= ?v_21 ?v_22)) (?v_25 (= ?v_21 ?v_20))) (let ((?v_96 (ite (not ?v_25) ?v_26 i1531)) (?v_45 (ite (not ?v_30) ?v_31 i1531)) (?v_49 (ite (not ?v_33) 0 i1531)) (?v_54 (ite (not ?v_35) 0 i1531)) (?v_307 (not ?v_40))) (let ((?v_27 (<= 4 (+ ?v_96 0))) (?v_32 (= ?v_45 ?v_3)) (?v_34 (= ?v_49 ?v_3)) (?v_28 (ite ?v_25 48 (ite ?v_30 124 (ite (= ?v_21 (+ 16 0)) (ite ?v_17 18 (ite ?v_23 27 ?v_21)) (ite ?v_33 52 (ite ?v_40 126 (ite ?v_35 207 ?v_21))))))) (?v_52 (+ 207 0)) (?v_51 (+ 126 0))) (let ((?v_41 (= ?v_28 ?v_51)) (?v_47 (+ 52 0)) (?v_55 (= ?v_28 (+ 18 0)))) (let ((?v_300 (not ?v_41))) (let ((?v_71 (ite ?v_300 0 i1589)) (?v_36 (ite (= ?v_28 ?v_24) (ite (not ?v_27) 50 (ite ?v_27 122 ?v_28)) (ite (= ?v_28 ?v_29) (ite (not ?v_32) 125 (ite ?v_32 205 ?v_28)) (ite ?v_55 19 (ite (= ?v_28 (+ 27 0)) 29 (ite (= ?v_28 ?v_47) (ite (not ?v_34) 53 (ite ?v_34 89 ?v_28)) (ite ?v_41 128 (ite (not (= ?v_28 ?v_52)) ?v_28 (ite (not (= ?v_54 ?v_3)) 208 ?v_28))))))))) (?v_73 (+ 208 0))) (let ((?v_82 (= ?v_36 ?v_73)) (?v_67 (+ 128 0)) (?v_66 (+ 89 0))) (let ((?v_209 (= ?v_36 ?v_66)) (?v_65 (+ 53 0))) (let ((?v_77 (= ?v_36 ?v_65)) (?v_86 (+ 29 0)) (?v_56 (= ?v_36 (+ 19 0))) (?v_53 (= ?v_36 ?v_39)) (?v_68 (= ?v_36 ?v_38)) (?v_48 (= ?v_36 ?v_37)) (?v_44 (= ?v_36 ?v_22))) (let ((?v_99 (ite (not ?v_44) ?v_45 i1651)) (?v_155 (ite (not ?v_48) ?v_49 i1651)) (?v_64 (ite (not ?v_53) ?v_54 i1651)) (?v_306 (not ?v_68)) (?v_537 (not ?v_77)) (?v_221 (not ?v_82))) (let ((?v_129 (ite ?v_221 0 i1651)) (?v_289 (not ?v_209))) (let ((?v_291 (ite ?v_289 0 i1652)) (?v_46 (= ?v_99 ?v_3)) (?v_50 (= ?v_155 ?v_3)) (?v_93 (+ 210 0)) (?v_92 (+ 203 0)) (?v_91 (+ 130 0)) (?v_90 (+ 90 0)) (?v_89 (+ 54 0)) (?v_113 (+ 35 0)) (?v_126 (+ 219 0)) (?v_122 (+ 132 0)) (?v_121 (+ 91 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(?v_79 (= ?v_43 ?v_89)) (?v_208 (= ?v_43 ?v_90)) (?v_74 (= ?v_43 ?v_91)) (?v_63 (= ?v_43 ?v_92)) (?v_371 (= ?v_43 ?v_93))) (let ((?v_61 (ite ?v_58 43 (ite (= ?v_43 ?v_29) (ite (not ?v_46) 125 (ite ?v_46 205 ?v_43)) (ite (= ?v_43 ?v_47) (ite (not ?v_50) 53 (ite ?v_50 89 ?v_43)) (ite ?v_70 128 (ite (= ?v_43 ?v_52) (ite (not (= ?v_64 ?v_3)) 208 ?v_43) (ite (= ?v_43 (+ 21 0)) (ite ?v_57 23 (ite (not ?v_57) 26 ?v_43)) (ite ?v_62 207 (ite ?v_79 56 (ite ?v_208 91 (ite ?v_74 132 (ite ?v_63 207 (ite ?v_371 219 ?v_43))))))))))))) (?v_136 (ite (not ?v_58) ?v_59 i1727))) (let ((?v_60 (= ?v_136 ?v_3)) (?v_108 (= ?v_61 ?v_38)) (?v_84 (= ?v_61 ?v_39)) (?v_85 (ite ?v_62 i1727 (ite (not ?v_63) ?v_64 i1727))) (?v_115 (= ?v_61 ?v_65)) (?v_210 (= ?v_61 ?v_66)) (?v_78 (* (- 1) i1651))) (let ((?v_109 (ite ?v_306 ?v_69 ?v_78)) (?v_299 (not ?v_70))) (let ((?v_111 (ite ?v_299 ?v_71 i1727))) (let ((?v_72 (= (- 1) (+ (+ 0 (+ 0 (- 1) ?v_109) ?v_111) 0))) (?v_128 (= ?v_61 ?v_73)) (?v_124 (ite (not ?v_74) (ite (not ?v_75) 0 i1495) i1727))) (let ((?v_76 (<= 4 (+ ?v_124 0)))) (let ((?v_81 (not ?v_76)) (?v_87 (= ?v_61 (+ 26 0))) (?v_116 (ite ?v_537 0 ?v_78)) (?v_528 (not ?v_79))) (let ((?v_119 (ite ?v_528 0 i1727))) (let ((?v_80 (= (- 1) (+ (+ 0 (+ 0 (- 1) ?v_116) ?v_119) 0))) (?v_213 (= ?v_61 ?v_121))) (let ((?v_83 (ite (= ?v_61 ?v_10) (ite (not ?v_60) 46 (ite ?v_60 122 ?v_61)) (ite ?v_108 126 (ite ?v_84 207 (ite (= ?v_61 ?v_52) (ite (not (= ?v_85 ?v_3)) 208 ?v_61) (ite ?v_115 54 (ite ?v_210 90 (ite (= ?v_61 ?v_67) (ite ?v_72 130 (ite (not ?v_72) 203 ?v_61)) (ite ?v_128 210 (ite (= ?v_61 (+ 23 0)) (ite ?v_76 24 (ite ?v_81 25 ?v_61)) (ite ?v_87 29 (ite (= ?v_61 ?v_114) (ite ?v_80 57 (ite (not ?v_80) 89 ?v_61)) (ite ?v_213 473 (ite (= ?v_61 ?v_122) (ite ?v_81 133 (ite ?v_76 201 ?v_61)) (ite (not (= ?v_61 ?v_126)) ?v_61 (ite (not (<= ?v_129 ?v_3)) 223 ?v_61))))))))))))))))) (let ((?v_95 (= ?v_83 ?v_20)) (?v_98 (= ?v_83 ?v_22)) (?v_110 (= ?v_83 ?v_51)) (?v_103 (ite (not ?v_84) ?v_85 i1874)) (?v_106 (ite (not ?v_87) 0 1))) (let ((?v_88 (= ?v_106 ?v_3)) (?v_294 (= ?v_83 ?v_66)) (?v_127 (= ?v_83 ?v_73)) (?v_118 (= ?v_83 ?v_89)) (?v_207 (= ?v_83 ?v_90)) (?v_123 (= ?v_83 ?v_91)) (?v_101 (= ?v_83 ?v_92)) (?v_370 (= ?v_83 ?v_93)) (?v_104 (= ?v_83 (+ 24 0))) (?v_105 (= ?v_83 (+ 25 0))) (?v_359 (= ?v_83 ?v_142)) (?v_130 (= ?v_83 ?v_144)) (?v_102 (= ?v_83 ?v_145)) (?v_132 (= ?v_83 ?v_146))) (let ((?v_94 (ite ?v_95 48 (ite ?v_98 124 (ite ?v_110 128 (ite (= ?v_83 ?v_52) (ite (not (= ?v_103 ?v_3)) 208 ?v_83) (ite (= ?v_83 ?v_86) (ite (not ?v_88) 35 (ite ?v_88 41 ?v_83)) (ite ?v_294 90 (ite ?v_127 210 (ite ?v_118 56 (ite ?v_207 91 (ite ?v_123 132 (ite ?v_101 207 (ite ?v_370 219 (ite ?v_104 29 (ite ?v_105 29 (ite ?v_359 58 (ite (= ?v_83 ?v_143) 92 (ite ?v_130 135 (ite ?v_102 207 (ite ?v_132 225 ?v_83))))))))))))))))))))) (let ((?v_135 (= ?v_94 ?v_8)) (?v_177 (ite (not ?v_95) ?v_96 i2029))) (let ((?v_97 (<= 4 (+ ?v_177 0))) (?v_152 (ite (not ?v_98) ?v_99 i2029))) (let ((?v_100 (= ?v_152 ?v_3)) (?v_139 (ite ?v_101 i2029 (ite (not ?v_102) ?v_103 i2029))) (?v_107 (= (ite ?v_104 1 (ite ?v_105 0 ?v_106)) ?v_3)) (?v_305 (not ?v_108)) (?v_117 (* (- 1) i1874))) (let ((?v_190 (ite ?v_305 ?v_109 ?v_117)) (?v_298 (not ?v_110))) (let ((?v_192 (ite ?v_298 ?v_111 i2029))) (let ((?v_112 (= (- 1) (+ (+ 0 (+ 0 (- 1) ?v_190) ?v_192) 0))) (?v_140 (= ?v_94 ?v_73)) (?v_138 (= ?v_94 ?v_113)) (?v_292 (= ?v_94 ?v_90)) (?v_369 (= ?v_94 ?v_93)) (?v_536 (not ?v_115))) (let ((?v_310 (ite ?v_536 ?v_116 ?v_117)) (?v_527 (not ?v_118))) (let ((?v_312 (ite ?v_527 ?v_119 i2029))) (let ((?v_120 (= (- 1) (+ (+ 0 (+ 0 (- 1) ?v_310) ?v_312) 0))) (?v_212 (= ?v_94 ?v_121)) (?v_163 (ite (not ?v_123) ?v_124 i2029))) (let ((?v_125 (<= 4 (+ ?v_163 0))) (?v_219 (not ?v_127)) (?v_220 (not ?v_128))) (let ((?v_141 (ite ?v_219 (ite ?v_220 ?v_129 i1874) i2029)) (?v_363 (= ?v_94 ?v_167)) (?v_206 (= ?v_94 ?v_168)) (?v_171 (ite (not ?v_130) 0 i2029))) (let ((?v_131 (= ?v_171 ?v_3)) (?v_175 (ite (not ?v_132) 0 i2029))) (let ((?v_133 (= ?v_175 ?v_3))) (let ((?v_134 (ite ?v_135 43 (ite (= ?v_94 ?v_24) (ite (not ?v_97) 50 (ite ?v_97 122 ?v_94)) (ite (= ?v_94 ?v_29) (ite (not ?v_100) 125 (ite ?v_100 205 ?v_94)) (ite (= ?v_94 ?v_52) (ite (not (= ?v_139 ?v_3)) 208 ?v_94) (ite (= ?v_94 ?v_86) (ite (not ?v_107) 35 (ite ?v_107 41 ?v_94)) (ite (= ?v_94 ?v_67) (ite ?v_112 130 (ite (not ?v_112) 203 ?v_94)) (ite ?v_140 210 (ite ?v_138 207 (ite ?v_292 91 (ite ?v_369 219 (ite (= ?v_94 ?v_114) (ite ?v_120 57 (ite (not ?v_120) 89 ?v_94)) (ite ?v_212 473 (ite (= ?v_94 ?v_122) (ite (not ?v_125) 133 (ite ?v_125 201 ?v_94)) (ite (= ?v_94 ?v_126) (ite (not (<= ?v_141 ?v_3)) 223 ?v_94) (ite ?v_363 449 (ite ?v_206 93 (ite (= ?v_94 ?v_169) (ite (not ?v_131) 138 (ite ?v_131 170 ?v_94)) (ite (not (= ?v_94 ?v_173)) ?v_94 (ite (not ?v_133) 227 (ite ?v_133 263 ?v_94)))))))))))))))))))))) (let ((?v_147 (= ?v_134 ?v_8)) (?v_148 (ite (not ?v_135) ?v_136 i2201))) (let ((?v_137 (= ?v_148 ?v_3)) (?v_151 (= ?v_134 ?v_22)) (?v_154 (= ?v_134 ?v_37)) (?v_189 (= ?v_134 ?v_38)) (?v_157 (= ?v_134 ?v_39)) (?v_161 (ite (not ?v_138) ?v_139 i2201)) (?v_340 (= ?v_134 ?v_66)) (?v_165 (= ?v_134 ?v_73)) (?v_158 (= ?v_134 ?v_113)) (?v_162 (= ?v_134 ?v_91)) (?v_159 (= ?v_134 ?v_92)) (?v_368 (= ?v_134 ?v_93)) (?v_282 (= ?v_134 ?v_121)) (?v_218 (not ?v_140))) (let ((?v_166 (ite ?v_218 ?v_141 i2201)) (?v_358 (= ?v_134 ?v_142)) (?v_170 (= ?v_134 ?v_144)) (?v_160 (= ?v_134 ?v_145)) (?v_174 (= ?v_134 ?v_146)) (?v_205 (= ?v_134 ?v_200)) (?v_491 (= ?v_134 ?v_201)) (?v_588 (= ?v_134 ?v_202)) (?v_179 (= ?v_134 ?v_203)) (?v_181 (= ?v_134 ?v_204))) (let ((?v_150 (ite ?v_147 43 (ite (= ?v_134 ?v_10) (ite (not ?v_137) 46 (ite ?v_137 122 ?v_134)) (ite ?v_151 124 (ite ?v_154 52 (ite ?v_189 126 (ite ?v_157 207 (ite (= ?v_134 ?v_52) (ite (not (= ?v_161 ?v_3)) 208 ?v_134) (ite ?v_340 90 (ite ?v_165 210 (ite ?v_158 207 (ite ?v_162 132 (ite ?v_159 207 (ite ?v_368 219 (ite ?v_282 473 (ite (= ?v_134 ?v_126) (ite (not (<= ?v_166 ?v_3)) 223 ?v_134) (ite ?v_358 58 (ite (= ?v_134 ?v_143) 92 (ite ?v_170 135 (ite ?v_160 207 (ite ?v_174 225 (ite (= ?v_134 ?v_199) 59 (ite ?v_205 95 (ite ?v_491 139 (ite ?v_588 171 (ite ?v_179 229 (ite ?v_181 265 ?v_134))))))))))))))))))))))))))) (?v_149 (= (ite (not ?v_147) ?v_148 i2370) ?v_3))) (let ((?v_184 (= ?v_150 ?v_20)) (?v_186 (= ?v_150 ?v_22)) (?v_187 (ite (not ?v_151) ?v_152 i2370))) (let ((?v_153 (= ?v_187 ?v_3)) (?v_275 (ite (not ?v_154) ?v_155 i2370))) (let ((?v_156 (= ?v_275 ?v_3)) (?v_191 (= ?v_150 ?v_51)) (?v_234 (ite ?v_157 i2370 (ite ?v_158 i2370 (ite ?v_159 i2370 (ite (not ?v_160) ?v_161 i2370))))) (?v_194 (= ?v_150 ?v_73)) (?v_338 (= ?v_150 ?v_90)) (?v_367 (= ?v_150 ?v_93)) (?v_315 (ite (not ?v_162) ?v_163 i2370))) (let ((?v_164 (<= 4 (+ ?v_315 0))) (?v_217 (not ?v_165))) (let ((?v_195 (ite ?v_217 ?v_166 i2370)) (?v_196 (= ?v_150 ?v_146)) (?v_362 (= ?v_150 ?v_167)) (?v_285 (= ?v_150 ?v_168)) (?v_238 (ite (not ?v_170) ?v_171 i2370))) (let ((?v_172 (= ?v_238 ?v_3)) (?v_197 (ite (not ?v_174) ?v_175 i2370))) (let ((?v_176 (= ?v_197 ?v_3)) (?v_357 (= ?v_150 ?v_243)) (?v_178 (<= ?v_177 ?v_3)) (?v_488 (= ?v_150 ?v_247)) (?v_593 (= ?v_150 ?v_248)) (?v_251 (ite (not ?v_179) 0 i2370))) (let ((?v_180 (= ?v_251 ?v_3)) (?v_255 (ite (not ?v_181) 0 i2370))) (let ((?v_182 (= ?v_255 ?v_3))) (let ((?v_183 (ite (= ?v_150 ?v_10) (ite (not ?v_149) 46 (ite ?v_149 122 ?v_150)) (ite ?v_184 48 (ite ?v_186 124 (ite (= ?v_150 ?v_29) (ite (not ?v_153) 125 (ite ?v_153 205 ?v_150)) (ite (= ?v_150 ?v_47) (ite (not ?v_156) 53 (ite ?v_156 89 ?v_150)) (ite ?v_191 128 (ite (= ?v_150 ?v_52) (ite (not (= ?v_234 ?v_3)) 208 ?v_150) (ite ?v_194 210 (ite ?v_338 91 (ite ?v_367 219 (ite (= ?v_150 ?v_122) (ite (not ?v_164) 133 (ite ?v_164 201 ?v_150)) (ite (= ?v_150 ?v_126) (ite (not (<= ?v_195 ?v_3)) 223 ?v_150) (ite (= ?v_150 ?v_143) 92 (ite ?v_196 225 (ite ?v_362 449 (ite ?v_285 93 (ite (= ?v_150 ?v_169) (ite (not ?v_172) 138 (ite ?v_172 170 ?v_150)) (ite (= ?v_150 ?v_173) (ite (not ?v_176) 227 (ite ?v_176 263 ?v_150)) (ite ?v_357 60 (ite (= ?v_150 ?v_244) (ite (not ?v_178) 97 (ite ?v_178 115 ?v_150)) (ite ?v_488 629 (ite ?v_593 172 (ite (= ?v_150 ?v_249) (ite (not ?v_180) 584 (ite ?v_180 263 ?v_150)) (ite (not (= ?v_150 ?v_253)) ?v_150 (ite (not ?v_182) 500 (ite ?v_182 344 ?v_150)))))))))))))))))))))))))))) (let ((?v_225 (= ?v_183 ?v_20)) (?v_228 (= ?v_183 ?v_22)) (?v_226 (ite (not ?v_184) ?v_177 i2560))) (let ((?v_185 (<= 4 (+ ?v_226 0))) (?v_229 (ite (not ?v_186) ?v_187 i2560))) (let ((?v_188 (= ?v_229 ?v_3)) (?v_303 (= ?v_183 ?v_38)) (?v_231 (= ?v_183 ?v_39)) (?v_309 (= ?v_183 ?v_65)) (?v_512 (= ?v_183 ?v_66)) (?v_304 (not ?v_189))) (let ((?v_618 (ite ?v_304 ?v_190 (* (- 1) i2370))) (?v_297 (not ?v_191))) (let ((?v_625 (ite ?v_297 ?v_192 i2560))) (let ((?v_193 (= (- 1) (+ (+ 0 (+ 0 (- 1) ?v_618) ?v_625) 0))) (?v_236 (= ?v_183 ?v_73)) (?v_366 (= ?v_183 ?v_93)) (?v_342 (= ?v_183 ?v_121)) (?v_216 (not ?v_194))) (let ((?v_215 (ite ?v_216 ?v_195 i2560)) (?v_237 (= ?v_183 ?v_144)) (?v_232 (= ?v_183 ?v_145)) (?v_240 (= ?v_183 ?v_146)) (?v_331 (= ?v_183 ?v_168)) (?v_241 (ite (not ?v_196) ?v_197 i2560))) (let ((?v_198 (= ?v_241 ?v_3)) (?v_281 (= ?v_183 ?v_200)) (?v_490 (= ?v_183 ?v_201)) (?v_587 (= ?v_183 ?v_202)) (?v_250 (= ?v_183 ?v_203)) (?v_254 (= ?v_183 ?v_204)) (?v_356 (= ?v_183 ?v_327)) (?v_286 (not ?v_206)) (?v_287 (not ?v_207)) (?v_288 (not ?v_208)) (?v_290 (not ?v_210))) (let ((?v_295 (ite ?v_290 ?v_291 i1875))) (let ((?v_293 (ite ?v_287 (ite ?v_288 0 ?v_291) ?v_295)) (?v_211 (ite ?v_289 0 (* (- 1) i1652)))) (let ((?v_337 (ite ?v_290 ?v_211 (* (- 1) i1875)))) (let ((?v_335 (ite ?v_287 (ite ?v_288 0 ?v_211) ?v_337))) (let ((?v_333 (ite ?v_286 0 ?v_335)) (?v_284 (not ?v_213))) (let ((?v_343 (ite ?v_212 i1140 (ite ?v_284 0 i1140)))) (let ((?v_235 (ite (not ?v_205) 0 (+ 0 ?v_333 ?v_343)))) (let ((?v_214 (= ?v_235 ?v_3)) (?v_233 (= ?v_183 ?v_257)) (?v_589 (= ?v_183 ?v_346)) (?v_348 (ite ?v_216 (ite ?v_217 (ite ?v_218 (ite ?v_219 (ite ?v_220 (ite ?v_221 0 (ite ?v_260 0 (- 2147483647))) (ite ?v_261 0 (- 2147483647))) (ite ?v_262 0 (- 2147483647))) (ite ?v_263 0 (- 2147483647))) (ite ?v_264 0 (- 2147483647))) (ite ?v_265 0 (- 2147483647))))) (let ((?v_222 (<= ?v_215 (+ ?v_348 0)))) (let ((?v_223 (not ?v_222)) (?v_269 (= ?v_183 ?v_353))) (let ((?v_224 (ite ?v_225 48 (ite ?v_228 124 (ite (= ?v_183 ?v_24) (ite (not ?v_185) 50 (ite ?v_185 122 ?v_183)) (ite (= ?v_183 ?v_29) (ite (not ?v_188) 125 (ite ?v_188 205 ?v_183)) (ite ?v_303 126 (ite ?v_231 207 (ite ?v_309 54 (ite ?v_512 90 (ite (= ?v_183 ?v_67) (ite ?v_193 130 (ite (not ?v_193) 203 ?v_183)) (ite ?v_236 210 (ite ?v_366 219 (ite ?v_342 473 (ite (= ?v_183 ?v_126) (ite (not (<= ?v_215 ?v_3)) 223 ?v_183) (ite ?v_237 135 (ite ?v_232 207 (ite ?v_240 225 (ite ?v_331 93 (ite (= ?v_183 ?v_173) (ite (not ?v_198) 227 (ite ?v_198 263 ?v_183)) (ite (= ?v_183 ?v_199) 59 (ite ?v_281 95 (ite ?v_490 139 (ite ?v_587 171 (ite ?v_250 229 (ite ?v_254 265 (ite ?v_356 62 (ite (= ?v_183 ?v_328) (ite ?v_214 98 (ite (not ?v_214) 115 ?v_183)) (ite ?v_233 207 (ite (= ?v_183 ?v_345) 140 (ite ?v_589 453 (ite (= ?v_183 ?v_347) (ite ?v_223 585 (ite ?v_222 582 ?v_183)) (ite (= ?v_183 ?v_351) (ite ?v_223 501 (ite ?v_222 498 ?v_183)) (ite ?v_269 346 ?v_183)))))))))))))))))))))))))))))))))) (let ((?v_271 (= ?v_224 ?v_22)) (?v_245 (ite (not ?v_225) ?v_226 i2747))) (let ((?v_227 (<= 4 (+ ?v_245 0))) (?v_272 (ite (not ?v_228) ?v_229 i2747))) (let ((?v_230 (= ?v_272 ?v_3)) (?v_274 (= ?v_224 ?v_37)) (?v_302 (= ?v_224 ?v_38)) (?v_277 (= ?v_224 ?v_39)) (?v_296 (= ?v_224 ?v_51)) (?v_280 (ite ?v_231 i2747 (ite ?v_232 i2747 (ite (not ?v_233) ?v_234 ?v_235)))) (?v_311 (= ?v_224 ?v_89)) (?v_510 (= ?v_224 ?v_90)) (?v_314 (= ?v_224 ?v_91)) (?v_278 (= ?v_224 ?v_92)) (?v_365 (= ?v_224 ?v_93)) (?v_259 (not ?v_236))) (let ((?v_266 (ite ?v_259 ?v_215 i2747))) (let ((?v_317 (not (<= ?v_266 ?v_3))) (?v_318 (= ?v_224 ?v_146)) (?v_452 (ite (not ?v_237) ?v_238 i2747))) (let ((?v_239 (= ?v_452 ?v_3)) (?v_319 (ite (not ?v_240) ?v_241 i2747))) (let ((?v_242 (= ?v_319 ?v_3)) (?v_329 (= ?v_224 ?v_200)) (?v_321 (= ?v_224 ?v_203)) (?v_324 (= ?v_224 ?v_204)) (?v_438 (= ?v_224 ?v_243)) (?v_246 (<= ?v_245 ?v_3))) (let ((?v_258 (not ?v_246)) (?v_487 (= ?v_224 ?v_247)) (?v_592 (= ?v_224 ?v_248)) (?v_322 (ite (not ?v_250) ?v_251 i2747))) (let ((?v_252 (= ?v_322 ?v_3)) (?v_325 (ite (not ?v_254) ?v_255 i2747))) (let ((?v_256 (= ?v_325 ?v_3)) (?v_279 (= ?v_224 ?v_257)) (?v_553 (= ?v_224 ?v_408)) (?v_489 (= ?v_224 ?v_409)) (?v_412 (ite ?v_259 (ite ?v_216 (ite ?v_217 (ite ?v_218 (ite ?v_219 (ite ?v_220 (ite ?v_221 0 (ite ?v_260 1 2147483647)) (ite ?v_261 1 2147483647)) (ite ?v_262 1 2147483647)) (ite ?v_263 1 2147483647)) (ite ?v_264 1 2147483647)) (ite ?v_265 1 2147483647)) (ite ?v_349 1 2147483647)))) (let ((?v_267 (<= ?v_412 (+ ?v_266 0)))) (let ((?v_268 (not ?v_267)) (?v_420 (ite (not ?v_269) 0 i2747))) (let ((?v_270 (ite ?v_271 124 (ite (= ?v_224 ?v_24) (ite (not ?v_227) 50 (ite ?v_227 122 ?v_224)) (ite (= ?v_224 ?v_29) (ite (not ?v_230) 125 (ite ?v_230 205 ?v_224)) (ite ?v_274 52 (ite ?v_302 126 (ite ?v_277 207 (ite ?v_296 128 (ite (= ?v_224 ?v_52) (ite (not (= ?v_280 ?v_3)) 208 ?v_224) (ite ?v_311 56 (ite ?v_510 91 (ite ?v_314 132 (ite ?v_278 207 (ite ?v_365 219 (ite (= ?v_224 ?v_126) (ite ?v_317 223 ?v_224) (ite (= ?v_224 ?v_143) 92 (ite ?v_318 225 (ite (= ?v_224 ?v_169) (ite (not ?v_239) 138 (ite ?v_239 170 ?v_224)) (ite (= ?v_224 ?v_173) (ite (not ?v_242) 227 (ite ?v_242 263 ?v_224)) (ite ?v_329 95 (ite ?v_321 229 (ite ?v_324 265 (ite ?v_438 60 (ite (= ?v_224 ?v_244) (ite ?v_258 97 (ite ?v_246 115 ?v_224)) (ite ?v_487 629 (ite ?v_592 172 (ite (= ?v_224 ?v_249) (ite (not ?v_252) 584 (ite ?v_252 263 ?v_224)) (ite (= ?v_224 ?v_253) (ite (not ?v_256) 500 (ite ?v_256 344 ?v_224)) (ite ?v_279 207 (ite (= ?v_224 ?v_407) (ite ?v_258 64 (ite ?v_246 85 ?v_224)) (ite ?v_553 545 (ite ?v_489 141 (ite (= ?v_224 ?v_410) 173 (ite (= ?v_224 ?v_411) 582 (ite (= ?v_224 ?v_354) (ite ?v_268 583 (ite ?v_267 230 ?v_224)) (ite (= ?v_224 ?v_416) 498 (ite (= ?v_224 ?v_355) (ite ?v_268 499 (ite ?v_267 267 ?v_224)) (ite (not (= ?v_224 ?v_418)) ?v_224 (ite (not (= ?v_420 ?v_3)) 347 ?v_224)))))))))))))))))))))))))))))))))))))))) (let ((?v_373 (= ?v_270 ?v_22)) (?v_374 (ite (not ?v_271) ?v_272 i2954))) (let ((?v_273 (= ?v_374 ?v_3)) (?v_377 (= ?v_270 ?v_37)) (?v_388 (= ?v_270 ?v_38)) (?v_380 (= ?v_270 ?v_39)) (?v_378 (ite (not ?v_274) ?v_275 i2954))) (let ((?v_276 (= ?v_378 ?v_3)) (?v_386 (= ?v_270 ?v_51)) (?v_283 (* (- 1) i1140))) (let ((?v_688 (ite ?v_282 ?v_283 (ite ?v_212 ?v_283 (ite ?v_284 0 ?v_283)))) (?v_332 (not ?v_285)) (?v_334 (not ?v_292)) (?v_336 (not ?v_294))) (let ((?v_694 (ite ?v_336 ?v_295 i2030))) (let ((?v_692 (ite ?v_334 ?v_293 ?v_694))) (let ((?v_699 (ite ?v_332 (ite ?v_286 0 ?v_293) ?v_692))) (let ((?v_330 (ite (not ?v_281) ?v_235 (- (+ 0 ?v_688 ?v_699))))) (let ((?v_385 (ite ?v_277 i2954 (ite ?v_278 i2954 (ite (not ?v_279) ?v_280 ?v_330)))) (?v_624 (not ?v_296)) (?v_531 (* (- 1) i2954)) (?v_530 (* (- 1) i2029)) (?v_529 (* (- 1) i1727))) (let ((?v_387 (ite ?v_624 (ite ?v_297 (ite ?v_298 (ite ?v_299 (ite ?v_300 0 ?v_301) ?v_529) ?v_530) (* (- 1) i2560)) ?v_531)) (?v_616 (not ?v_302)) (?v_617 (not ?v_303))) (let ((?v_389 (ite ?v_616 (ite ?v_617 (ite ?v_304 (ite ?v_305 (ite ?v_306 (ite ?v_307 0 i1531) i1651) i1874) i2370) i2747) i2954))) (let ((?v_308 (= (+ 0 ?v_387 (+ 0 1 ?v_389)) ?v_390)) (?v_402 (= ?v_270 ?v_73)) (?v_535 (not ?v_309)) (?v_619 (* (- 1) i2747))) (let ((?v_629 (ite ?v_535 ?v_310 ?v_619)) (?v_526 (not ?v_311))) (let ((?v_632 (ite ?v_526 ?v_312 i2954))) (let ((?v_313 (= (- 1) (+ (+ 0 (+ 0 (- 1) ?v_629) ?v_632) 0))) (?v_514 (= ?v_270 ?v_121)) (?v_427 (ite (not ?v_314) ?v_315 i2954))) (let ((?v_316 (<= 4 (+ ?v_427 0))) (?v_392 (= ?v_270 ?v_146)) (?v_508 (= ?v_270 ?v_168)) (?v_393 (ite (not ?v_318) ?v_319 i2954))) (let ((?v_320 (= ?v_393 ?v_3)) (?v_607 (= ?v_270 ?v_201)) (?v_718 (= ?v_270 ?v_202)) (?v_395 (= ?v_270 ?v_203)) (?v_398 (= ?v_270 ?v_204)) (?v_396 (ite (not ?v_321) ?v_322 i2954))) (let ((?v_323 (= ?v_396 ?v_3)) (?v_399 (ite (not ?v_324) ?v_325 i2954))) (let ((?v_326 (= ?v_399 ?v_3)) (?v_436 (= ?v_270 ?v_327)) (?v_698 (not ?v_331)) (?v_691 (not ?v_338)) (?v_693 (not ?v_340))) (let ((?v_696 (ite ?v_693 ?v_694 i2371))) (let ((?v_700 (ite ?v_691 ?v_692 ?v_696)) (?v_360 (* (- 1) i2030))) (let ((?v_341 (ite ?v_336 ?v_337 ?v_360))) (let ((?v_339 (ite ?v_334 ?v_335 ?v_341)) (?v_361 (* (- 1) i2371))) (let ((?v_513 (ite ?v_693 ?v_341 ?v_361))) (let ((?v_511 (ite ?v_691 ?v_339 ?v_513))) (let ((?v_509 (ite ?v_698 (ite ?v_332 ?v_333 ?v_339) ?v_511)) (?v_515 (ite ?v_342 i1140 (ite ?v_282 i1140 ?v_343)))) (let ((?v_382 (ite (not ?v_329) ?v_330 (+ 0 ?v_509 ?v_515)))) (let ((?v_344 (= ?v_382 ?v_3))) (let ((?v_401 (not ?v_344)) (?v_381 (= ?v_270 ?v_257)) (?v_586 (= ?v_270 ?v_346)) (?v_404 (ite ?v_259 ?v_348 (ite ?v_349 0 (- 2147483647))))) (let ((?v_350 (<= ?v_266 (+ ?v_404 0)))) (let ((?v_352 (not ?v_350)) (?v_419 (= ?v_270 ?v_353)) (?v_441 (not ?v_357)) (?v_439 (not ?v_358)) (?v_440 (not ?v_359))) (let ((?v_442 (ite ?v_439 (ite ?v_440 0 i2030) i2371)) (?v_437 (not ?v_363))) (let ((?v_384 (ite (not ?v_356) 0 (+ 0 (ite ?v_441 0 (ite ?v_439 (ite ?v_440 0 ?v_360) ?v_361)) (ite ?v_362 i1140 (ite ?v_437 0 i1140)))))) (let ((?v_364 (= ?v_384 ?v_3)) (?v_383 (= ?v_270 ?v_421)) (?v_486 (= ?v_270 ?v_478)) (?v_591 (= ?v_270 ?v_479)) (?v_498 (= ?v_270 ?v_423)) (?v_481 (ite (not ?v_365) (ite (not ?v_366) (ite (not ?v_367) (ite (not ?v_368) (ite (not ?v_369) (ite (not ?v_370) (ite (not ?v_371) 0 i1728) i2030) i2202) i2371) i2561) i2748) i2955))) (let ((?v_372 (= (- 1) (+ ?v_481 0)))) (let ((?v_426 (not ?v_372)) (?v_500 (= ?v_270 ?v_483))) (let ((?v_376 (ite ?v_373 124 (ite (= ?v_270 ?v_29) (ite (not ?v_273) 125 (ite ?v_273 205 ?v_270)) (ite ?v_377 52 (ite ?v_388 126 (ite ?v_380 207 (ite (= ?v_270 ?v_47) (ite (not ?v_276) 53 (ite ?v_276 89 ?v_270)) (ite ?v_386 128 (ite (= ?v_270 ?v_52) (ite (not (= ?v_385 ?v_3)) 208 ?v_270) (ite (= ?v_270 ?v_67) (ite ?v_308 130 (ite (not ?v_308) 203 ?v_270)) (ite ?v_402 210 (ite (= ?v_270 ?v_114) (ite ?v_313 57 (ite (not ?v_313) 89 ?v_270)) (ite ?v_514 473 (ite (= ?v_270 ?v_122) (ite (not ?v_316) 133 (ite ?v_316 201 ?v_270)) (ite (= ?v_270 ?v_126) (ite ?v_317 223 ?v_270) (ite ?v_392 225 (ite ?v_508 93 (ite (= ?v_270 ?v_173) (ite (not ?v_320) 227 (ite ?v_320 263 ?v_270)) (ite ?v_607 139 (ite ?v_718 171 (ite ?v_395 229 (ite ?v_398 265 (ite (= ?v_270 ?v_244) (ite ?v_258 97 (ite ?v_246 115 ?v_270)) (ite (= ?v_270 ?v_249) (ite (not ?v_323) 584 (ite ?v_323 263 ?v_270)) (ite (= ?v_270 ?v_253) (ite (not ?v_326) 500 (ite ?v_326 344 ?v_270)) (ite ?v_436 62 (ite (= ?v_270 ?v_328) (ite ?v_344 98 (ite ?v_401 115 ?v_270)) (ite ?v_381 207 (ite (= ?v_270 ?v_345) 140 (ite ?v_586 453 (ite (= ?v_270 ?v_347) (ite ?v_352 585 (ite ?v_350 582 ?v_270)) (ite (= ?v_270 ?v_351) (ite ?v_352 501 (ite ?v_350 498 ?v_270)) (ite ?v_419 346 (ite (= ?v_270 ?v_354) (ite ?v_268 583 (ite ?v_267 230 ?v_270)) (ite (= ?v_270 ?v_355) (ite ?v_268 499 (ite ?v_267 267 ?v_270)) (ite (= ?v_270 ?v_474) (ite ?v_364 66 (ite (not ?v_364) 85 ?v_270)) (ite ?v_383 207 (ite (= ?v_270 ?v_477) 99 (ite ?v_486 143 (ite ?v_591 174 (ite (= ?v_270 ?v_422) 230 (ite ?v_498 232 (ite (= ?v_270 ?v_424) 267 (ite (= ?v_270 ?v_425) (ite ?v_372 268 (ite ?v_426 344 ?v_270)) (ite ?v_500 348 ?v_270))))))))))))))))))))))))))))))))))))))))))))) (?v_375 (= (ite (not ?v_373) ?v_374 i3166) ?v_3))) (let ((?v_445 (= ?v_376 ?v_38)) (?v_430 (= ?v_376 ?v_39)) (?v_379 (= (ite (not ?v_377) ?v_378 i3166) ?v_3)) (?v_443 (= ?v_376 ?v_51)) (?v_435 (ite ?v_380 i3166 (ite ?v_381 ?v_382 (ite ?v_383 ?v_384 ?v_385)))) (?v_534 (= ?v_376 ?v_65)) (?v_623 (not ?v_386)) (?v_501 (* (- 1) i3166))) (let ((?v_444 (ite ?v_623 ?v_387 ?v_501)) (?v_615 (not ?v_388))) (let ((?v_446 (ite ?v_615 ?v_389 i3166))) (let ((?v_391 (= (+ 0 ?v_444 (+ 0 1 ?v_446)) ?v_390)) (?v_450 (= ?v_376 ?v_73)) (?v_448 (= ?v_376 ?v_91)) (?v_431 (= ?v_376 ?v_92)) (?v_480 (= ?v_376 ?v_93)) (?v_451 (= ?v_376 ?v_144)) (?v_432 (= ?v_376 ?v_145)) (?v_454 (= ?v_376 ?v_146)) (?v_455 (ite (not ?v_392) ?v_393 i3166))) (let ((?v_394 (= ?v_455 ?v_3)) (?v_507 (= ?v_376 ?v_200)) (?v_457 (= ?v_376 ?v_203)) (?v_460 (= ?v_376 ?v_204)) (?v_603 (= ?v_376 ?v_247)) (?v_723 (= ?v_376 ?v_248)) (?v_458 (ite (not ?v_395) ?v_396 i3166))) (let ((?v_397 (= ?v_458 ?v_3)) (?v_461 (ite (not ?v_398) ?v_399 i3166))) (let ((?v_400 (= ?v_461 ?v_3)) (?v_433 (= ?v_376 ?v_257)) (?v_403 (not ?v_402))) (let ((?v_414 (ite ?v_403 ?v_266 i3166)) (?v_465 (ite ?v_403 ?v_404 (ite ?v_413 0 (- 2147483647))))) (let ((?v_405 (<= ?v_414 (+ ?v_465 0)))) (let ((?v_406 (not ?v_405)) (?v_472 (= ?v_376 ?v_353)) (?v_552 (= ?v_376 ?v_408)) (?v_605 (= ?v_376 ?v_409)) (?v_468 (ite ?v_403 ?v_412 (ite ?v_413 1 2147483647)))) (let ((?v_415 (<= ?v_468 (+ ?v_414 0)))) (let ((?v_417 (not ?v_415)) (?v_473 (ite (not ?v_419) ?v_420 i3166)) (?v_434 (= ?v_376 ?v_421)) (?v_496 (= ?v_376 ?v_423)) (?v_550 (= ?v_376 ?v_570)) (?v_428 (<= ?v_427 ?v_3)) (?v_585 (= ?v_376 ?v_574)) (?v_708 (= ?v_376 ?v_484)) (?v_497 (= ?v_376 ?v_485)) (?v_502 (= ?v_376 ?v_575))) (let ((?v_429 (ite (= ?v_376 ?v_29) (ite (not ?v_375) 125 (ite ?v_375 205 ?v_376)) (ite ?v_445 126 (ite ?v_430 207 (ite (= ?v_376 ?v_47) (ite (not ?v_379) 53 (ite ?v_379 89 ?v_376)) (ite ?v_443 128 (ite (= ?v_376 ?v_52) (ite (not (= ?v_435 ?v_3)) 208 ?v_376) (ite ?v_534 54 (ite (= ?v_376 ?v_66) 90 (ite (= ?v_376 ?v_67) (ite ?v_391 130 (ite (not ?v_391) 203 ?v_376)) (ite ?v_450 210 (ite ?v_448 132 (ite ?v_431 207 (ite ?v_480 219 (ite (= ?v_376 ?v_142) 58 (ite (= ?v_376 ?v_143) 92 (ite ?v_451 135 (ite ?v_432 207 (ite ?v_454 225 (ite (= ?v_376 ?v_173) (ite (not ?v_394) 227 (ite ?v_394 263 ?v_376)) (ite ?v_507 95 (ite ?v_457 229 (ite ?v_460 265 (ite ?v_603 629 (ite ?v_723 172 (ite (= ?v_376 ?v_249) (ite (not ?v_397) 584 (ite ?v_397 263 ?v_376)) (ite (= ?v_376 ?v_253) (ite (not ?v_400) 500 (ite ?v_400 344 ?v_376)) (ite (= ?v_376 ?v_328) (ite ?v_344 98 (ite ?v_401 115 ?v_376)) (ite ?v_433 207 (ite (= ?v_376 ?v_347) (ite ?v_406 585 (ite ?v_405 582 ?v_376)) (ite (= ?v_376 ?v_351) (ite ?v_406 501 (ite ?v_405 498 ?v_376)) (ite ?v_472 346 (ite (= ?v_376 ?v_407) (ite ?v_258 64 (ite ?v_246 85 ?v_376)) (ite ?v_552 545 (ite ?v_605 141 (ite (= ?v_376 ?v_410) 173 (ite (= ?v_376 ?v_411) 582 (ite (= ?v_376 ?v_354) (ite ?v_417 583 (ite ?v_415 230 ?v_376)) (ite (= ?v_376 ?v_416) 498 (ite (= ?v_376 ?v_355) (ite ?v_417 499 (ite ?v_415 267 ?v_376)) (ite (= ?v_376 ?v_418) (ite (not (= ?v_473 ?v_3)) 347 ?v_376) (ite ?v_434 207 (ite (= ?v_376 ?v_422) 230 (ite ?v_496 232 (ite (= ?v_376 ?v_424) 267 (ite (= ?v_376 ?v_425) (ite ?v_372 268 (ite ?v_426 344 ?v_376)) (ite (= ?v_376 ?v_569) 605 (ite ?v_550 100 (ite (= ?v_376 ?v_571) (ite (not ?v_428) 145 (ite ?v_428 166 ?v_376)) (ite ?v_585 176 (ite ?v_708 234 (ite ?v_497 270 (ite ?v_502 350 ?v_376)))))))))))))))))))))))))))))))))))))))))))))))))))))) (let ((?v_522 (= ?v_429 ?v_38)) (?v_504 (= ?v_429 ?v_39)) (?v_520 (= ?v_429 ?v_51)) (?v_475 (ite (not ?v_436) ?v_384 (- (+ 0 (ite ?v_362 ?v_283 (ite ?v_437 0 ?v_283)) (ite ?v_438 ?v_442 (ite ?v_441 0 ?v_442))))))) (let ((?v_519 (ite ?v_430 i3389 (ite ?v_431 i3389 (ite ?v_432 i3389 (ite ?v_433 ?v_382 (ite (not ?v_434) ?v_435 ?v_475)))))) (?v_533 (= ?v_429 ?v_65)) (?v_622 (not ?v_443)) (?v_551 (* (- 1) i3389))) (let ((?v_521 (ite ?v_622 ?v_444 ?v_551)) (?v_614 (not ?v_445))) (let ((?v_523 (ite ?v_614 ?v_446 i3389))) (let ((?v_447 (= (+ 0 ?v_521 (+ 0 1 ?v_523)) ?v_390)) (?v_541 (= ?v_429 ?v_73)) (?v_525 (= ?v_429 ?v_89)) (?v_539 (= ?v_429 ?v_91)) (?v_505 (= ?v_429 ?v_92)) (?v_566 (= ?v_429 ?v_93)) (?v_493 (ite (not ?v_448) ?v_427 i3389))) (let ((?v_449 (<= 4 (+ ?v_493 0))) (?v_464 (not ?v_450))) (let ((?v_463 (ite ?v_464 ?v_414 i3389)) (?v_689 (= ?v_429 ?v_168)) (?v_638 (ite (not ?v_451) ?v_452 i3389))) (let ((?v_453 (= ?v_638 ?v_3)) (?v_641 (ite (not ?v_454) ?v_455 i3389))) (let ((?v_456 (= ?v_641 ?v_3)) (?v_542 (= ?v_429 ?v_203)) (?v_545 (= ?v_429 ?v_204)) (?v_543 (ite (not ?v_457) ?v_458 i3389))) (let ((?v_459 (= ?v_543 ?v_3)) (?v_546 (ite (not ?v_460) ?v_461 i3389))) (let ((?v_462 (= ?v_546 ?v_3)) (?v_506 (= ?v_429 ?v_257)) (?v_717 (= ?v_429 ?v_346)) (?v_557 (ite ?v_464 ?v_465 (ite ?v_469 0 (- 2147483647))))) (let ((?v_466 (<= ?v_463 (+ ?v_557 0)))) (let ((?v_467 (not ?v_466)) (?v_564 (= ?v_429 ?v_353)) (?v_739 (= ?v_429 ?v_408)) (?v_560 (ite ?v_464 ?v_468 (ite ?v_469 1 2147483647)))) (let ((?v_470 (<= ?v_560 (+ ?v_463 0)))) (let ((?v_471 (not ?v_470)) (?v_565 (ite (not ?v_472) ?v_473 i3389)) (?v_476 (= ?v_475 ?v_3)) (?v_516 (= ?v_429 ?v_421)) (?v_602 (= ?v_429 ?v_478)) (?v_721 (= ?v_429 ?v_479)) (?v_580 (= ?v_429 ?v_423)) (?v_567 (ite (not ?v_480) ?v_481 i3390))) (let ((?v_482 (= (- 1) (+ ?v_567 0)))) (let ((?v_495 (not ?v_482)) (?v_680 (= ?v_429 ?v_483)) (?v_707 (= ?v_429 ?v_484)) (?v_581 (= ?v_429 ?v_485)) (?v_548 (= ?v_429 ?v_664)) (?v_604 (ite ?v_487 ?v_283 (ite (not ?v_488) 0 ?v_283))) (?v_608 (ite (not ?v_490) (ite (not ?v_491) 0 i2371) i2748))) (let ((?v_606 (ite (not ?v_489) 0 ?v_608))) (let ((?v_518 (ite (not ?v_486) 0 (- (+ 0 ?v_604 ?v_606))))) (let ((?v_492 (= ?v_518 ?v_3)) (?v_517 (= ?v_429 ?v_576)) (?v_494 (<= ?v_493 ?v_3)) (?v_582 (ite ?v_496 i3389 (ite (not ?v_497) (ite (not ?v_498) 0 i3166) i3389)))) (let ((?v_499 (<= 4 (+ ?v_582 0))) (?v_681 (not ?v_500)) (?v_678 (not ?v_502))) (let ((?v_503 (ite ?v_522 126 (ite ?v_504 207 (ite ?v_520 128 (ite (= ?v_429 ?v_52) (ite (not (= ?v_519 ?v_3)) 208 ?v_429) (ite ?v_533 54 (ite (= ?v_429 ?v_66) 90 (ite (= ?v_429 ?v_67) (ite ?v_447 130 (ite (not ?v_447) 203 ?v_429)) (ite ?v_541 210 (ite ?v_525 56 (ite (= ?v_429 ?v_90) 91 (ite ?v_539 132 (ite ?v_505 207 (ite ?v_566 219 (ite (= ?v_429 ?v_122) (ite (not ?v_449) 133 (ite ?v_449 201 ?v_429)) (ite (= ?v_429 ?v_126) (ite (not (<= ?v_463 ?v_3)) 223 ?v_429) (ite (= ?v_429 ?v_167) 449 (ite ?v_689 93 (ite (= ?v_429 ?v_169) (ite (not ?v_453) 138 (ite ?v_453 170 ?v_429)) (ite (= ?v_429 ?v_173) (ite (not ?v_456) 227 (ite ?v_456 263 ?v_429)) (ite ?v_542 229 (ite ?v_545 265 (ite (= ?v_429 ?v_244) (ite ?v_258 97 (ite ?v_246 115 ?v_429)) (ite (= ?v_429 ?v_249) (ite (not ?v_459) 584 (ite ?v_459 263 ?v_429)) (ite (= ?v_429 ?v_253) (ite (not ?v_462) 500 (ite ?v_462 344 ?v_429)) (ite ?v_506 207 (ite (= ?v_429 ?v_345) 140 (ite ?v_717 453 (ite (= ?v_429 ?v_347) (ite ?v_467 585 (ite ?v_466 582 ?v_429)) (ite (= ?v_429 ?v_351) (ite ?v_467 501 (ite ?v_466 498 ?v_429)) (ite ?v_564 346 (ite ?v_739 545 (ite (= ?v_429 ?v_411) 582 (ite (= ?v_429 ?v_354) (ite ?v_471 583 (ite ?v_470 230 ?v_429)) (ite (= ?v_429 ?v_416) 498 (ite (= ?v_429 ?v_355) (ite ?v_471 499 (ite ?v_470 267 ?v_429)) (ite (= ?v_429 ?v_418) (ite (not (= ?v_565 ?v_3)) 347 ?v_429) (ite (= ?v_429 ?v_474) (ite ?v_476 66 (ite (not ?v_476) 85 ?v_429)) (ite ?v_516 207 (ite (= ?v_429 ?v_477) 99 (ite ?v_602 143 (ite ?v_721 174 (ite (= ?v_429 ?v_422) 230 (ite ?v_580 232 (ite (= ?v_429 ?v_424) 267 (ite (= ?v_429 ?v_425) (ite ?v_482 268 (ite ?v_495 344 ?v_429)) (ite ?v_680 348 (ite ?v_707 234 (ite ?v_581 270 (ite (= ?v_429 ?v_663) 67 (ite ?v_548 102 (ite (= ?v_429 ?v_665) (ite ?v_492 147 (ite (not ?v_492) 166 ?v_429)) (ite ?v_517 207 (ite (= ?v_429 ?v_668) (ite (not ?v_494) 178 (ite ?v_494 199 ?v_429)) (ite (= ?v_429 ?v_577) (ite ?v_495 240 (ite ?v_482 238 ?v_429)) (ite (= ?v_429 ?v_579) (ite (not ?v_499) 272 (ite ?v_499 344 ?v_429)) (ite (not (= ?v_429 ?v_676)) ?v_429 (ite (= (- 1) (+ (+ 0 (+ 0 (- 1) (ite ?v_681 0 ?v_501)) (ite ?v_678 0 i3389)) 0)) 352 ?v_429))))))))))))))))))))))))))))))))))))))))))))))))))))))))))) (let ((?v_620 (= ?v_503 ?v_51)) (?v_697 (not ?v_508)) (?v_690 (not ?v_510)) (?v_695 (not ?v_512))) (let ((?v_701 (ite ?v_690 ?v_700 (ite ?v_695 ?v_696 i2748))) (?v_549 (ite (not ?v_507) ?v_382 (+ 0 (ite ?v_697 ?v_509 (ite ?v_690 ?v_511 (ite ?v_695 ?v_513 (* (- 1) i2748)))) (ite ?v_514 i1140 ?v_515))))) (let ((?v_611 (ite ?v_504 i3642 (ite ?v_505 i3642 (ite ?v_506 ?v_549 (ite ?v_516 ?v_475 (ite ?v_517 ?v_518 ?v_519)))))) (?v_621 (not ?v_520)) (?v_532 (* (- 1) i3642)) (?v_613 (not ?v_522))) (let ((?v_524 (= (+ 0 (ite ?v_621 ?v_521 ?v_532) (+ 0 1 (ite ?v_613 ?v_523 i3642))) ?v_390)) (?v_636 (= ?v_503 ?v_73)) (?v_630 (= ?v_503 ?v_89)) (?v_634 (= ?v_503 ?v_91)) (?v_596 (= ?v_503 ?v_92)) (?v_660 (= ?v_503 ?v_93)) (?v_631 (not ?v_525)) (?v_627 (not ?v_533)) (?v_628 (not ?v_534))) (let ((?v_538 (= (+ 0 (ite ?v_631 (ite ?v_526 (ite ?v_527 (ite ?v_528 0 ?v_529) ?v_530) ?v_531) ?v_532) (+ 0 1 (ite ?v_627 (ite ?v_628 (ite ?v_535 (ite ?v_536 (ite ?v_537 0 i1651) i1874) i2747) i3389) i3642))) ?v_390)) (?v_572 (ite (not ?v_539) ?v_493 i3642))) (let ((?v_540 (<= 4 (+ ?v_572 0))) (?v_556 (not ?v_541))) (let ((?v_555 (ite ?v_556 ?v_463 i3642)) (?v_637 (= ?v_503 ?v_144)) (?v_597 (= ?v_503 ?v_145)) (?v_640 (= ?v_503 ?v_146)) (?v_687 (= ?v_503 ?v_200)) (?v_643 (= ?v_503 ?v_203)) (?v_646 (= ?v_503 ?v_204)) (?v_644 (ite (not ?v_542) ?v_543 i3642))) (let ((?v_544 (= ?v_644 ?v_3)) (?v_647 (ite (not ?v_545) ?v_546 i3642))) (let ((?v_547 (= ?v_647 ?v_3)) (?v_743 (not ?v_550)) (?v_740 (not ?v_552)) (?v_741 (not ?v_553))) (let ((?v_599 (ite (not ?v_548) ?v_549 (+ 0 (ite ?v_743 0 ?v_551) (ite ?v_740 (ite ?v_741 0 i2954) i3389))))) (let ((?v_554 (= ?v_599 ?v_3)) (?v_598 (= ?v_503 ?v_257)) (?v_651 (ite ?v_556 ?v_557 (ite ?v_561 0 (- 2147483647))))) (let ((?v_558 (<= ?v_555 (+ ?v_651 0)))) (let ((?v_559 (not ?v_558)) (?v_658 (= ?v_503 ?v_353)) (?v_654 (ite ?v_556 ?v_560 (ite ?v_561 1 2147483647)))) (let ((?v_562 (<= ?v_654 (+ ?v_555 0)))) (let ((?v_563 (not ?v_562)) (?v_659 (ite (not ?v_564) ?v_565 i3642)) (?v_600 (= ?v_503 ?v_421)) (?v_672 (= ?v_503 ?v_423)) (?v_661 (ite (not ?v_566) ?v_567 i3643))) (let ((?v_568 (= (- 1) (+ ?v_661 0)))) (let ((?v_578 (not ?v_568)) (?v_679 (= ?v_503 ?v_483)) (?v_742 (= ?v_503 ?v_570)) (?v_573 (<= ?v_572 ?v_3)) (?v_716 (= ?v_503 ?v_574)) (?v_705 (= ?v_503 ?v_484)) (?v_673 (= ?v_503 ?v_485)) (?v_677 (= ?v_503 ?v_575)) (?v_601 (= ?v_503 ?v_576)) (?v_674 (ite ?v_580 i3642 (ite (not ?v_581) ?v_582 i3642)))) (let ((?v_583 (<= 4 (+ ?v_674 0)))) (let ((?v_595 (not ?v_583)) (?v_584 (<= ?v_245 ?v_390))) (let ((?v_772 (not ?v_584)) (?v_590 (ite (not ?v_588) 0 ?v_283))) (let ((?v_719 (ite ?v_587 ?v_283 ?v_590))) (let ((?v_720 (ite ?v_586 ?v_719 (ite (not ?v_589) 0 ?v_590))) (?v_724 (ite (not ?v_592) (ite (not ?v_593) 0 i2561) i2955))) (let ((?v_722 (ite (not ?v_591) 0 ?v_724))) (let ((?v_610 (ite (not ?v_585) 0 (- (+ 0 ?v_720 ?v_722))))) (let ((?v_594 (= ?v_610 ?v_3)) (?v_609 (= ?v_503 ?v_682)) (?v_788 (= ?v_503 ?v_683)) (?v_703 (= ?v_503 ?v_686)) (?v_706 (= ?v_503 ?v_778))) (let ((?v_612 (ite ?v_620 128 (ite (= ?v_503 ?v_52) (ite (not (= ?v_611 ?v_3)) 208 ?v_503) (ite (= ?v_503 ?v_67) (ite ?v_524 130 (ite (not ?v_524) 203 ?v_503)) (ite ?v_636 210 (ite ?v_630 56 (ite (= ?v_503 ?v_90) 91 (ite ?v_634 132 (ite ?v_596 207 (ite ?v_660 219 (ite (= ?v_503 ?v_114) (ite ?v_538 57 (ite (not ?v_538) 89 ?v_503)) (ite (= ?v_503 ?v_121) 473 (ite (= ?v_503 ?v_122) (ite (not ?v_540) 133 (ite ?v_540 201 ?v_503)) (ite (= ?v_503 ?v_126) (ite (not (<= ?v_555 ?v_3)) 223 ?v_503) (ite ?v_637 135 (ite ?v_597 207 (ite ?v_640 225 (ite (= ?v_503 ?v_199) 59 (ite ?v_687 95 (ite (= ?v_503 ?v_201) 139 (ite (= ?v_503 ?v_202) 171 (ite ?v_643 229 (ite ?v_646 265 (ite (= ?v_503 ?v_249) (ite (not ?v_544) 584 (ite ?v_544 263 ?v_503)) (ite (= ?v_503 ?v_253) (ite (not ?v_547) 500 (ite ?v_547 344 ?v_503)) (ite (= ?v_503 ?v_328) (ite ?v_554 98 (ite (not ?v_554) 115 ?v_503)) (ite ?v_598 207 (ite (= ?v_503 ?v_347) (ite ?v_559 585 (ite ?v_558 582 ?v_503)) (ite (= ?v_503 ?v_351) (ite ?v_559 501 (ite ?v_558 498 ?v_503)) (ite ?v_658 346 (ite (= ?v_503 ?v_409) 141 (ite (= ?v_503 ?v_410) 173 (ite (= ?v_503 ?v_411) 582 (ite (= ?v_503 ?v_354) (ite ?v_563 583 (ite ?v_562 230 ?v_503)) (ite (= ?v_503 ?v_416) 498 (ite (= ?v_503 ?v_355) (ite ?v_563 499 (ite ?v_562 267 ?v_503)) (ite (= ?v_503 ?v_418) (ite (not (= ?v_659 ?v_3)) 347 ?v_503) (ite ?v_600 207 (ite (= ?v_503 ?v_477) 99 (ite (= ?v_503 ?v_422) 230 (ite ?v_672 232 (ite (= ?v_503 ?v_424) 267 (ite (= ?v_503 ?v_425) (ite ?v_568 268 (ite ?v_578 344 ?v_503)) (ite ?v_679 348 (ite (= ?v_503 ?v_569) 605 (ite ?v_742 100 (ite (= ?v_503 ?v_571) (ite (not ?v_573) 145 (ite ?v_573 166 ?v_503)) (ite ?v_716 176 (ite ?v_705 234 (ite ?v_673 270 (ite ?v_677 350 (ite ?v_601 207 (ite (= ?v_503 ?v_577) (ite ?v_578 240 (ite ?v_568 238 ?v_503)) (ite (= ?v_503 ?v_579) (ite ?v_595 272 (ite ?v_583 344 ?v_503)) (ite (= ?v_503 ?v_770) 68 (ite (= ?v_503 ?v_771) (ite ?v_772 104 (ite ?v_584 115 ?v_503)) (ite (= ?v_503 ?v_773) 577 (ite (= ?v_503 ?v_774) (ite ?v_594 180 (ite (not ?v_594) 199 ?v_503)) (ite ?v_609 207 (ite ?v_788 241 (ite (= ?v_503 ?v_684) (ite ?v_583 240 (ite ?v_595 249 ?v_503)) (ite ?v_703 274 (ite ?v_706 354 ?v_503))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))) (?v_666 (ite (not ?v_602) ?v_518 (- (+ 0 (ite ?v_603 ?v_283 ?v_604) (ite (not ?v_605) ?v_606 (ite (not ?v_607) ?v_608 i3167))))))) (let ((?v_715 (ite ?v_596 i3915 (ite ?v_597 i3915 (ite ?v_598 ?v_599 (ite ?v_600 ?v_475 (ite ?v_601 ?v_666 (ite ?v_609 ?v_610 ?v_611))))))) (?v_626 (= (- 1) (+ (+ 0 (+ 0 (- 1) (ite ?v_613 (ite ?v_614 (ite ?v_615 (ite ?v_616 (ite ?v_617 ?v_618 ?v_619) ?v_531) ?v_501) ?v_551) ?v_532)) (ite (not ?v_620) (ite ?v_621 (ite ?v_622 (ite ?v_623 (ite ?v_624 ?v_625 i2954) i3166) i3389) i3642) i3915)) 0))) (?v_728 (= ?v_612 ?v_73)) (?v_726 (= ?v_612 ?v_91)) (?v_709 (= ?v_612 ?v_92)) (?v_756 (= ?v_612 ?v_93)) (?v_633 (= (- 1) (+ (+ 0 (+ 0 (- 1) (ite ?v_627 (ite ?v_628 ?v_629 ?v_551) ?v_532)) (ite (not ?v_630) (ite ?v_631 ?v_632 i3642) i3915)) 0))) (?v_669 (ite (not ?v_634) ?v_572 i3915))) (let ((?v_635 (<= 4 (+ ?v_669 0))) (?v_650 (not ?v_636))) (let ((?v_649 (ite ?v_650 ?v_555 i3915)) (?v_729 (= ?v_612 ?v_144)) (?v_710 (= ?v_612 ?v_145)) (?v_732 (= ?v_612 ?v_146)) (?v_730 (ite (not ?v_637) ?v_638 i3915))) (let ((?v_639 (= ?v_730 ?v_3)) (?v_733 (ite (not ?v_640) ?v_641 i3915))) (let ((?v_642 (= ?v_733 ?v_3)) (?v_735 (= ?v_612 ?v_204)) (?v_645 (= (ite (not ?v_643) ?v_644 i3915) ?v_3)) (?v_736 (ite (not ?v_646) ?v_647 i3915))) (let ((?v_648 (= ?v_736 ?v_3)) (?v_711 (= ?v_612 ?v_257)) (?v_747 (ite ?v_650 ?v_651 (ite ?v_655 0 (- 2147483647))))) (let ((?v_652 (<= ?v_649 (+ ?v_747 0)))) (let ((?v_653 (not ?v_652)) (?v_754 (= ?v_612 ?v_353)) (?v_750 (ite ?v_650 ?v_654 (ite ?v_655 1 2147483647)))) (let ((?v_656 (<= ?v_750 (+ ?v_649 0)))) (let ((?v_657 (not ?v_656)) (?v_755 (ite (not ?v_658) ?v_659 i3915)) (?v_762 (= ?v_612 ?v_423)) (?v_757 (ite (not ?v_660) ?v_661 i3916))) (let ((?v_662 (= (- 1) (+ ?v_757 0)))) (let ((?v_671 (not ?v_662)) (?v_768 (= ?v_612 ?v_483)) (?v_763 (= ?v_612 ?v_485)) (?v_766 (= ?v_612 ?v_575)) (?v_738 (= ?v_612 ?v_664)) (?v_667 (= ?v_666 ?v_3)) (?v_713 (= ?v_612 ?v_576)) (?v_670 (<= ?v_669 ?v_3)) (?v_764 (ite ?v_672 i3915 (ite (not ?v_673) ?v_674 i3915)))) (let ((?v_675 (<= 4 (+ ?v_764 0)))) (let ((?v_685 (not ?v_675)) (?v_767 (ite (not ?v_677) (ite ?v_678 0 ?v_551) (* (- 1) i3915))) (?v_769 (ite (not ?v_679) (ite (not ?v_680) (ite ?v_681 0 i3166) i3642) i3915)) (?v_714 (= ?v_612 ?v_682)) (?v_787 (= ?v_612 ?v_683)) (?v_782 (= ?v_612 ?v_686)) (?v_712 (ite (not ?v_687) ?v_599 (- (+ 0 (ite ?v_514 ?v_283 (ite ?v_342 ?v_283 ?v_688)) (ite ?v_689 ?v_701 (ite ?v_697 (ite ?v_698 ?v_699 ?v_700) ?v_701))))))) (let ((?v_702 (= ?v_712 ?v_3)) (?v_785 (= ?v_612 ?v_779)) (?v_783 (ite (not ?v_703) 0 i3915))) (let ((?v_704 (= ?v_783 ?v_3))) (let ((?v_725 (ite (= ?v_612 ?v_52) (ite (not (= ?v_715 ?v_3)) 208 ?v_612) (ite (= ?v_612 ?v_66) 90 (ite (= ?v_612 ?v_67) (ite ?v_626 130 (ite (not ?v_626) 203 ?v_612)) (ite ?v_728 210 (ite ?v_726 132 (ite ?v_709 207 (ite ?v_756 219 (ite (= ?v_612 ?v_114) (ite ?v_633 57 (ite (not ?v_633) 89 ?v_612)) (ite (= ?v_612 ?v_121) 473 (ite (= ?v_612 ?v_122) (ite (not ?v_635) 133 (ite ?v_635 201 ?v_612)) (ite (= ?v_612 ?v_126) (ite (not (<= ?v_649 ?v_3)) 223 ?v_612) (ite (= ?v_612 ?v_142) 58 (ite (= ?v_612 ?v_143) 92 (ite ?v_729 135 (ite ?v_710 207 (ite ?v_732 225 (ite (= ?v_612 ?v_169) (ite (not ?v_639) 138 (ite ?v_639 170 ?v_612)) (ite (= ?v_612 ?v_173) (ite (not ?v_642) 227 (ite ?v_642 263 ?v_612)) (ite ?v_735 265 (ite (= ?v_612 ?v_243) 60 (ite (= ?v_612 ?v_244) (ite ?v_258 97 (ite ?v_246 115 ?v_612)) (ite (= ?v_612 ?v_247) 629 (ite (= ?v_612 ?v_248) 172 (ite (= ?v_612 ?v_249) (ite (not ?v_645) 584 (ite ?v_645 263 ?v_612)) (ite (= ?v_612 ?v_253) (ite (not ?v_648) 500 (ite ?v_648 344 ?v_612)) (ite ?v_711 207 (ite (= ?v_612 ?v_347) (ite ?v_653 585 (ite ?v_652 582 ?v_612)) (ite (= ?v_612 ?v_351) (ite ?v_653 501 (ite ?v_652 498 ?v_612)) (ite ?v_754 346 (ite (= ?v_612 ?v_408) 545 (ite (= ?v_612 ?v_411) 582 (ite (= ?v_612 ?v_354) (ite ?v_657 583 (ite ?v_656 230 ?v_612)) (ite (= ?v_612 ?v_416) 498 (ite (= ?v_612 ?v_355) (ite ?v_657 499 (ite ?v_656 267 ?v_612)) (ite (= ?v_612 ?v_418) (ite (not (= ?v_755 ?v_3)) 347 ?v_612) (ite (= ?v_612 ?v_478) 143 (ite (= ?v_612 ?v_479) 174 (ite (= ?v_612 ?v_422) 230 (ite ?v_762 232 (ite (= ?v_612 ?v_424) 267 (ite (= ?v_612 ?v_425) (ite ?v_662 268 (ite ?v_671 344 ?v_612)) (ite ?v_768 348 (ite (= ?v_612 ?v_570) 100 (ite (= ?v_612 ?v_484) 234 (ite ?v_763 270 (ite ?v_766 350 (ite (= ?v_612 ?v_663) 67 (ite ?v_738 102 (ite (= ?v_612 ?v_665) (ite ?v_667 147 (ite (not ?v_667) 166 ?v_612)) (ite ?v_713 207 (ite (= ?v_612 ?v_668) (ite (not ?v_670) 178 (ite ?v_670 199 ?v_612)) (ite (= ?v_612 ?v_577) (ite ?v_671 240 (ite ?v_662 238 ?v_612)) (ite (= ?v_612 ?v_579) (ite ?v_685 272 (ite ?v_675 344 ?v_612)) (ite (= ?v_612 ?v_676) (ite (= (+ 0 ?v_767 (+ 0 1 ?v_769)) ?v_390) 352 ?v_612) (ite ?v_714 207 (ite ?v_787 241 (ite (= ?v_612 ?v_684) (ite ?v_675 240 (ite ?v_685 249 ?v_612)) (ite ?v_782 274 (ite (= ?v_612 (+ 68 0)) 70 (ite (= ?v_612 (+ 104 0)) (ite ?v_702 105 (ite (not ?v_702) 115 ?v_612)) (ite (= ?v_612 (+ 577 0)) 148 (ite (= ?v_612 (+ 180 0)) 601 (ite ?v_785 243 (ite (= ?v_612 ?v_780) 251 (ite (= ?v_612 ?v_781) (ite (not ?v_704) 275 (ite ?v_704 468 ?v_612)) (ite (not (= ?v_612 (+ 354 0))) ?v_612 (ite (not (<= 4 (+ (ite ?v_705 i3915 (ite (not ?v_706) (ite (not ?v_707) (ite (not ?v_708) 0 i3389) i3642) i3915)) 0))) 355 ?v_612)))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))) (?v_775 (ite (not ?v_716) ?v_610 (- (+ 0 (ite ?v_717 (ite ?v_718 ?v_283 ?v_719) ?v_720) (ite (not ?v_721) ?v_722 (ite (not ?v_723) ?v_724 i3390)))))) (?v_759 (ite (not ?v_726) ?v_669 i4203))) (let ((?v_727 (<= 4 (+ ?v_759 0))) (?v_746 (not ?v_728))) (let ((?v_745 (ite ?v_746 ?v_649 i4203)) (?v_731 (= (ite (not ?v_729) ?v_730 i4203) ?v_3)) (?v_734 (= (ite (not ?v_732) ?v_733 i4203) ?v_3)) (?v_737 (= (ite (not ?v_735) ?v_736 i4203) ?v_3)) (?v_744 (= (ite (not ?v_738) ?v_712 (- (+ 0 (ite (not ?v_739) (ite ?v_740 (ite ?v_741 0 ?v_531) ?v_551) ?v_532) (ite (not ?v_742) (ite ?v_743 0 i3389) i3915)))) ?v_3))) (let ((?v_748 (<= ?v_745 (+ (ite ?v_746 ?v_747 (ite ?v_751 0 (- 2147483647))) 0)))) (let ((?v_749 (not ?v_748)) (?v_752 (<= (ite ?v_746 ?v_750 (ite ?v_751 1 2147483647)) (+ ?v_745 0)))) (let ((?v_753 (not ?v_752)) (?v_758 (= (- 1) (+ (ite (not ?v_756) ?v_757 i4204) 0)))) (let ((?v_761 (not ?v_758)) (?v_760 (<= ?v_759 ?v_3)) (?v_765 (<= 4 (+ (ite ?v_762 i4203 (ite (not ?v_763) ?v_764 i4203)) 0)))) (let ((?v_777 (not ?v_765)) (?v_786 (* (- 1) i4203)) (?v_776 (= ?v_775 ?v_3)) (?v_784 (= (ite (not ?v_782) ?v_783 i4203) ?v_3))) (let ((?v_789 (= (+ 0 (ite (not ?v_785) 0 ?v_786) (+ 0 1 (ite (not ?v_787) (ite (not ?v_788) 0 i3915) i4203))) ?v_390))) (and true (= (ite (= ?v_725 ?v_52) (ite (not (= (ite ?v_709 i4203 (ite ?v_710 i4203 (ite ?v_711 ?v_712 (ite ?v_713 ?v_666 (ite (not ?v_714) ?v_715 ?v_775))))) ?v_3)) 208 ?v_725) (ite (= ?v_725 ?v_66) 90 (ite (= ?v_725 ?v_73) 210 (ite (= ?v_725 ?v_90) 91 (ite (= ?v_725 ?v_91) 132 (ite (= ?v_725 ?v_92) 207 (ite (= ?v_725 ?v_93) 219 (ite (= ?v_725 ?v_122) (ite (not ?v_727) 133 (ite ?v_727 201 ?v_725)) (ite (= ?v_725 ?v_126) (ite (not (<= ?v_745 ?v_3)) 223 ?v_725) (ite (= ?v_725 ?v_142) 58 (ite (= ?v_725 ?v_143) 92 (ite (= ?v_725 ?v_144) 135 (ite (= ?v_725 ?v_145) 207 (ite (= ?v_725 ?v_146) 225 (ite (= ?v_725 ?v_167) 449 (ite (= ?v_725 ?v_168) 93 (ite (= ?v_725 ?v_169) (ite (not ?v_731) 138 (ite ?v_731 170 ?v_725)) (ite (= ?v_725 ?v_173) (ite (not ?v_734) 227 (ite ?v_734 263 ?v_725)) (ite (= ?v_725 ?v_201) 139 (ite (= ?v_725 ?v_202) 171 (ite (= ?v_725 ?v_203) 229 (ite (= ?v_725 ?v_204) 265 (ite (= ?v_725 ?v_253) (ite (not ?v_737) 500 (ite ?v_737 344 ?v_725)) (ite (= ?v_725 ?v_327) 62 (ite (= ?v_725 ?v_328) (ite ?v_744 98 (ite (not ?v_744) 115 ?v_725)) (ite (= ?v_725 ?v_257) 207 (ite (= ?v_725 ?v_345) 140 (ite (= ?v_725 ?v_346) 453 (ite (= ?v_725 ?v_347) (ite ?v_749 585 (ite ?v_748 582 ?v_725)) (ite (= ?v_725 ?v_351) (ite ?v_749 501 (ite ?v_748 498 ?v_725)) (ite (= ?v_725 ?v_353) 346 (ite (= ?v_725 ?v_411) 582 (ite (= ?v_725 ?v_354) (ite ?v_753 583 (ite ?v_752 230 ?v_725)) (ite (= ?v_725 ?v_416) 498 (ite (= ?v_725 ?v_355) (ite ?v_753 499 (ite ?v_752 267 ?v_725)) (ite (= ?v_725 ?v_418) (ite (not (= (ite (not ?v_754) ?v_755 i4203) ?v_3)) 347 ?v_725) (ite (= ?v_725 ?v_477) 99 (ite (= ?v_725 ?v_422) 230 (ite (= ?v_725 ?v_423) 232 (ite (= ?v_725 ?v_424) 267 (ite (= ?v_725 ?v_425) (ite ?v_758 268 (ite ?v_761 344 ?v_725)) (ite (= ?v_725 ?v_483) 348 (ite (= ?v_725 ?v_571) (ite (not ?v_760) 145 (ite ?v_760 166 ?v_725)) (ite (= ?v_725 ?v_574) 176 (ite (= ?v_725 ?v_484) 234 (ite (= ?v_725 ?v_485) 270 (ite (= ?v_725 ?v_575) 350 (ite (= ?v_725 ?v_664) 102 (ite (= ?v_725 ?v_576) 207 (ite (= ?v_725 ?v_577) (ite ?v_761 240 (ite ?v_758 238 ?v_725)) (ite (= ?v_725 ?v_579) (ite ?v_777 272 (ite ?v_765 344 ?v_725)) (ite (= ?v_725 ?v_676) (ite (= (+ 0 (ite (not ?v_766) ?v_767 ?v_786) (+ 0 1 (ite (not ?v_768) ?v_769 i4203))) ?v_390) 352 ?v_725) (ite (= ?v_725 ?v_770) 68 (ite (= ?v_725 ?v_771) (ite ?v_772 104 (ite ?v_584 115 ?v_725)) (ite (= ?v_725 ?v_773) 577 (ite (= ?v_725 ?v_774) (ite ?v_776 180 (ite (not ?v_776) 199 ?v_725)) (ite (= ?v_725 ?v_682) 207 (ite (= ?v_725 ?v_683) 241 (ite (= ?v_725 ?v_684) (ite ?v_765 240 (ite ?v_777 249 ?v_725)) (ite (= ?v_725 ?v_686) 274 (ite (= ?v_725 ?v_778) 354 (ite (= ?v_725 ?v_779) 243 (ite (= ?v_725 ?v_780) 251 (ite (= ?v_725 ?v_781) (ite (not ?v_784) 275 (ite ?v_784 468 ?v_725)) (ite (= ?v_725 (+ 70 0)) (ite ?v_772 72 (ite ?v_584 85 ?v_725)) (ite (= ?v_725 (+ 105 0)) 613 (ite (= ?v_725 (+ 148 0)) 149 (ite (= ?v_725 (+ 601 0)) 181 (ite (= ?v_725 (+ 243 0)) (ite ?v_789 245 (ite (not ?v_789) 248 ?v_725)) (ite (= ?v_725 (+ 251 0)) 263 (ite (= ?v_725 (+ 275 0)) 276 (ite (= ?v_725 (+ 468 0)) (ite ?v_749 469 (ite ?v_748 466 ?v_725)) (ite (= ?v_725 (+ 355 0)) 357 ?v_725))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))) (+ 469 0)))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))) +(check-sat) +(exit) -- 2.30.2