601 lines
19 KiB
C++
601 lines
19 KiB
C++
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/**************************************************************************************************
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Originally From: Solver.C -- (C) Niklas Een, Niklas Sorensson, 2004
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Substantially modified by: Mate Soos (2010)
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**************************************************************************************************/
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#include "Solver.h"
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#include "XorSubsumer.h"
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#include "ClauseCleaner.h"
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#include "time_mem.h"
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#include "assert.h"
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#include <iomanip>
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#include "VarReplacer.h"
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#ifdef _MSC_VER
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#define __builtin_prefetch(a,b,c)
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#endif //_MSC_VER
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//#define VERBOSE_DEBUG
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#ifdef VERBOSE_DEBUG
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#define VERBOSE_DEBUGSUBSUME0
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#define BIT_MORE_VERBOSITY
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#endif
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#ifdef VERBOSE_DEBUG
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using std::cout;
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using std::endl;
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#endif //VERBOSE_DEBUG
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XorSubsumer::XorSubsumer(Solver& s):
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solver(s)
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, totalTime(0.0)
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, numElimed(0)
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, localSubstituteUseful(0)
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{
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};
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// Will put NULL in 'cs' if clause removed.
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void XorSubsumer::subsume0(XorClauseSimp& ps)
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{
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#ifdef VERBOSE_DEBUGSUBSUME0
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cout << "subsume0 orig clause:";
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ps.clause->plainPrint();
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#endif
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vec<Lit> origClause(ps.clause->size());
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std::copy(ps.clause->getData(), ps.clause->getDataEnd(), origClause.getData());
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const bool origClauseInverted = ps.clause->xor_clause_inverted();
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vec<Lit> unmatchedPart;
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bool needUnlinkPS = false;
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vec<XorClauseSimp> subs;
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findSubsumed(*ps.clause, subs);
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for (uint32_t i = 0; i < subs.size(); i++){
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XorClause* tmp = subs[i].clause;
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findUnMatched(origClause, *tmp, unmatchedPart);
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if (unmatchedPart.size() == 0) {
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#ifdef VERBOSE_DEBUGSUBSUME0
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cout << "subsume0 removing:";
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subs[i].clause->plainPrint();
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#endif
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clauses_subsumed++;
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assert(tmp->size() == origClause.size());
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if (origClauseInverted == tmp->xor_clause_inverted()) {
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unlinkClause(subs[i]);
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clauseFree(tmp);
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} else {
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solver.ok = false;
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return;
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}
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} else {
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assert(unmatchedPart.size() > 0);
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clauses_cut++;
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#ifdef VERBOSE_DEBUG
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std::cout << "Cutting xor-clause:";
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subs[i].clause->plainPrint();
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#endif //VERBOSE_DEBUG
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XorClause *c = solver.addXorClauseInt(unmatchedPart, tmp->xor_clause_inverted() ^ !origClauseInverted, tmp->getGroup());
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if (c != NULL) {
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linkInClause(*c);
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needUnlinkPS = true;
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}
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if (!solver.ok) return;
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}
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unmatchedPart.clear();
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}
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if (needUnlinkPS) {
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XorClause* tmp = ps.clause;
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unlinkClause(ps);
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clauseFree(tmp);
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}
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}
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void XorSubsumer::findUnMatched(vec<Lit>& A, XorClause& B, vec<Lit>& unmatchedPart)
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{
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for (uint32_t i = 0; i != B.size(); i++)
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seen_tmp[B[i].var()] = 1;
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for (uint32_t i = 0; i != A.size(); i++)
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seen_tmp[A[i].var()] = 0;
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for (uint32_t i = 0; i != B.size(); i++) {
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if (seen_tmp[B[i].var()] == 1) {
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unmatchedPart.push(Lit(B[i].var(), false));
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seen_tmp[B[i].var()] = 0;
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}
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}
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}
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void XorSubsumer::unlinkClause(XorClauseSimp c, const Var elim)
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{
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XorClause& cl = *c.clause;
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for (uint32_t i = 0; i < cl.size(); i++) {
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maybeRemove(occur[cl[i].var()], &cl);
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}
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if (elim != var_Undef)
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elimedOutVar[elim].push_back(c.clause);
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solver.detachClause(cl);
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clauses[c.index].clause = NULL;
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}
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void XorSubsumer::unlinkModifiedClause(vec<Lit>& origClause, XorClauseSimp c)
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{
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for (uint32_t i = 0; i < origClause.size(); i++) {
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maybeRemove(occur[origClause[i].var()], c.clause);
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}
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solver.detachModifiedClause(origClause[0].var(), origClause[1].var(), origClause.size(), c.clause);
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clauses[c.index].clause = NULL;
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}
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void XorSubsumer::unlinkModifiedClauseNoDetachNoNULL(vec<Lit>& origClause, XorClauseSimp c)
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{
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for (uint32_t i = 0; i < origClause.size(); i++) {
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maybeRemove(occur[origClause[i].var()], c.clause);
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}
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}
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XorClauseSimp XorSubsumer::linkInClause(XorClause& cl)
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{
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XorClauseSimp c(&cl, clauseID++);
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clauses.push(c);
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for (uint32_t i = 0; i < cl.size(); i++) {
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occur[cl[i].var()].push(c);
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}
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return c;
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}
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void XorSubsumer::linkInAlreadyClause(XorClauseSimp& c)
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{
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XorClause& cl = *c.clause;
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for (uint32_t i = 0; i < c.clause->size(); i++) {
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occur[cl[i].var()].push(c);
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}
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}
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void XorSubsumer::addFromSolver(vec<XorClause*>& cs)
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{
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clauseID = 0;
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clauses.clear();
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XorClause **i = cs.getData();
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for (XorClause **end = i + cs.size(); i != end; i++) {
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if (i+1 != end)
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__builtin_prefetch(*(i+1), 1, 1);
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linkInClause(**i);
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if ((*i)->getVarChanged() || (*i)->getStrenghtened())
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(*i)->calcXorAbstraction();
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}
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cs.clear();
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cs.push(NULL); //HACK --to force xor-propagation
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}
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void XorSubsumer::addBackToSolver()
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{
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solver.xorclauses.pop(); //HACK --to force xor-propagation
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for (uint32_t i = 0; i < clauses.size(); i++) {
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if (clauses[i].clause != NULL) {
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solver.xorclauses.push(clauses[i].clause);
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clauses[i].clause->unsetStrenghtened();
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clauses[i].clause->unsetVarChanged();
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}
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}
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for (Var var = 0; var < solver.nVars(); var++) {
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occur[var].clear();
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}
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clauses.clear();
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clauseID = 0;
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}
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void XorSubsumer::fillCannotEliminate()
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{
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std::fill(cannot_eliminate.getData(), cannot_eliminate.getDataEnd(), false);
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for (uint32_t i = 0; i < solver.clauses.size(); i++)
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addToCannotEliminate(solver.clauses[i]);
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for (uint32_t i = 0; i < solver.binaryClauses.size(); i++)
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if (!(*solver.binaryClauses[i]).learnt()) addToCannotEliminate(solver.binaryClauses[i]);
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const vec<Clause*>& tmp = solver.varReplacer->getClauses();
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for (uint32_t i = 0; i < tmp.size(); i++)
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addToCannotEliminate(tmp[i]);
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for (uint32_t i = 0; i < solver.assumptions.size(); i++)
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cannot_eliminate[solver.assumptions[i].var()] = true;
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#ifdef VERBOSE_DEBUG
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uint32_t tmpNum = 0;
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for (uint32_t i = 0; i < cannot_eliminate.size(); i++)
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if (cannot_eliminate[i])
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tmpNum++;
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std::cout << "Cannot eliminate num:" << tmpNum << std::endl;
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#endif
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}
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void XorSubsumer::extendModel(Solver& solver2)
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{
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assert(checkElimedUnassigned());
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vec<Lit> tmp;
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typedef map<Var, vector<XorClause*> > elimType;
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for (elimType::iterator it = elimedOutVar.begin(), end = elimedOutVar.end(); it != end; it++) {
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#ifdef VERBOSE_DEBUG
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Var var = it->first;
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std::cout << "Reinserting elimed var: " << var+1 << std::endl;
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#endif
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for (vector<XorClause*>::iterator it2 = it->second.begin(), end2 = it->second.end(); it2 != end2; it2++) {
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XorClause& c = **it2;
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#ifdef VERBOSE_DEBUG
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std::cout << "Reinserting Clause: ";
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c.plainPrint();
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#endif
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tmp.clear();
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tmp.growTo(c.size());
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std::copy(c.getData(), c.getDataEnd(), tmp.getData());
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bool inverted = c.xor_clause_inverted();
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solver2.addXorClause(tmp, inverted);
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assert(solver2.ok);
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}
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}
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}
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const bool XorSubsumer::localSubstitute()
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{
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vec<Lit> tmp;
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for (Var var = 0; var < occur.size(); var++) {
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vec<XorClauseSimp>& occ = occur[var];
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if (occ.size() <= 1) continue;
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for (uint32_t i = 0; i < occ.size(); i++) {
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XorClause& c1 = *occ[i].clause;
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for (uint32_t i2 = i+1; i2 < occ.size(); i2++) {
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XorClause& c2 = *occ[i2].clause;
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tmp.clear();
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tmp.growTo(c1.size() + c2.size());
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std::copy(c1.getData(), c1.getDataEnd(), tmp.getData());
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std::copy(c2.getData(), c2.getDataEnd(), tmp.getData() + c1.size());
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clearDouble(tmp);
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if (tmp.size() <= 2) {
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#ifdef VERBOSE_DEBUG
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std::cout << "Local substiuting. Clause1:"; c1.plainPrint();
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std::cout << "Clause 2:"; c2.plainPrint();
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#endif //VERBOSE_DEBUG
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localSubstituteUseful++;
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uint32_t lastSize = solver.varReplacer->getClauses().size();
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solver.addXorClauseInt(tmp, c1.xor_clause_inverted() ^ !c2.xor_clause_inverted(), c1.getGroup());
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for (uint32_t i = lastSize; i < solver.varReplacer->getClauses().size(); i++)
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addToCannotEliminate(solver.varReplacer->getClauses()[i]);
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if (!solver.ok) {
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#ifdef VERBOSE_DEBUG
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std::cout << "solver.ok is false after local substitution" << std::endl;
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#endif //VERBOSE_DEBUG
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return false;
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}
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}
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}
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}
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}
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return true;
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}
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void XorSubsumer::clearDouble(vec<Lit>& ps) const
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{
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std::sort(ps.getData(), ps.getDataEnd());
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Lit p;
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uint32_t i, j;
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for (i = j = 0, p = lit_Undef; i != ps.size(); i++) {
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if (ps[i].var() == p.var()) {
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//added, but easily removed
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j--;
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p = lit_Undef;
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} else
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ps[j++] = p = ps[i];
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}
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ps.shrink(i - j);
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}
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void XorSubsumer::removeWrong(vec<Clause*>& cs)
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{
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Clause **i = cs.getData();
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Clause **j = i;
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for (Clause **end = i + cs.size(); i != end; i++) {
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Clause& c = **i;
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if (!c.learnt()) {
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*j++ = *i;
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continue;
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}
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bool remove = false;
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for (Lit *l = c.getData(), *end2 = l+c.size(); l != end2; l++) {
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if (var_elimed[l->var()]) {
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remove = true;
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solver.detachClause(c);
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clauseFree(&c);
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break;
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}
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}
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if (!remove)
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*j++ = *i;
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}
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cs.shrink(i-j);
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}
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const bool XorSubsumer::removeDependent()
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{
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for (Var var = 0; var < occur.size(); var++) {
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if (cannot_eliminate[var] || !solver.decision_var[var] || solver.assigns[var] != l_Undef) continue;
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vec<XorClauseSimp>& occ = occur[var];
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if (occ.size() == 1) {
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#ifdef VERBOSE_DEBUG
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std::cout << "Eliminating dependent var " << var + 1 << std::endl;
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std::cout << "-> Removing dependent clause "; occ[0].clause->plainPrint();
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#endif //VERBOSE_DEBUG
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unlinkClause(occ[0], var);
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solver.setDecisionVar(var, false);
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var_elimed[var] = true;
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numElimed++;
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} else if (occ.size() == 2) {
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vec<Lit> lits;
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XorClause& c1 = *(occ[0].clause);
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lits.growTo(c1.size());
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std::copy(c1.getData(), c1.getDataEnd(), lits.getData());
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bool inverted = c1.xor_clause_inverted();
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XorClause& c2 = *(occ[1].clause);
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lits.growTo(lits.size() + c2.size());
|
||
|
|
std::copy(c2.getData(), c2.getDataEnd(), lits.getData() + c1.size());
|
||
|
|
inverted ^= !c2.xor_clause_inverted();
|
||
|
|
uint32_t group = c2.getGroup();
|
||
|
|
|
||
|
|
#ifdef VERBOSE_DEBUG
|
||
|
|
std::cout << "Eliminating var " << var + 1 << " present in 2 xor-clauses" << std::endl;
|
||
|
|
std::cout << "-> Removing xor clause "; occ[0].clause->plainPrint();
|
||
|
|
std::cout << "-> Removing xor clause "; occ[1].clause->plainPrint();
|
||
|
|
#endif //VERBOSE_DEBUG
|
||
|
|
XorClauseSimp toUnlink0 = occ[0];
|
||
|
|
XorClauseSimp toUnlink1 = occ[1];
|
||
|
|
unlinkClause(toUnlink0);
|
||
|
|
clauseFree(toUnlink0.clause);
|
||
|
|
unlinkClause(toUnlink1, var);
|
||
|
|
solver.setDecisionVar(var, false);
|
||
|
|
var_elimed[var] = true;
|
||
|
|
numElimed++;
|
||
|
|
|
||
|
|
uint32_t lastSize = solver.varReplacer->getClauses().size();
|
||
|
|
XorClause* c = solver.addXorClauseInt(lits, inverted, group);
|
||
|
|
#ifdef VERBOSE_DEBUG
|
||
|
|
if (c != NULL) {
|
||
|
|
std::cout << "-> Added combined xor clause:"; c->plainPrint();
|
||
|
|
} else
|
||
|
|
std::cout << "-> Combined xor clause is NULL" << std::endl;
|
||
|
|
#endif
|
||
|
|
if (c != NULL) linkInClause(*c);
|
||
|
|
for (uint32_t i = lastSize; i < solver.varReplacer->getClauses().size(); i++)
|
||
|
|
addToCannotEliminate(solver.varReplacer->getClauses()[i]);
|
||
|
|
if (!solver.ok) {
|
||
|
|
#ifdef VERBOSE_DEBUG
|
||
|
|
std::cout << "solver.ok is false after var-elim through xor" << std::endl;
|
||
|
|
#endif //VERBOSE_DEBUG
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
|
||
|
|
inline void XorSubsumer::addToCannotEliminate(Clause* it)
|
||
|
|
{
|
||
|
|
const Clause& c = *it;
|
||
|
|
for (uint32_t i2 = 0; i2 < c.size(); i2++)
|
||
|
|
cannot_eliminate[c[i2].var()] = true;
|
||
|
|
}
|
||
|
|
|
||
|
|
const bool XorSubsumer::unEliminate(const Var var)
|
||
|
|
{
|
||
|
|
assert(var_elimed[var]);
|
||
|
|
typedef map<Var, vector<XorClause*> > elimType;
|
||
|
|
elimType::iterator it = elimedOutVar.find(var);
|
||
|
|
|
||
|
|
//MUST set to decision, since it would never have been eliminated
|
||
|
|
//had it not been decision var
|
||
|
|
solver.setDecisionVar(var, true);
|
||
|
|
var_elimed[var] = false;
|
||
|
|
numElimed--;
|
||
|
|
assert(it != elimedOutVar.end());
|
||
|
|
|
||
|
|
FILE* backup_libraryCNFfile = solver.libraryCNFFile;
|
||
|
|
solver.libraryCNFFile = NULL;
|
||
|
|
for (vector<XorClause*>::iterator it2 = it->second.begin(), end2 = it->second.end(); it2 != end2; it2++) {
|
||
|
|
XorClause& c = **it2;
|
||
|
|
solver.addXorClause(c, c.xor_clause_inverted());
|
||
|
|
clauseFree(&c);
|
||
|
|
}
|
||
|
|
solver.libraryCNFFile = backup_libraryCNFfile;
|
||
|
|
elimedOutVar.erase(it);
|
||
|
|
|
||
|
|
return solver.ok;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
const bool XorSubsumer::simplifyBySubsumption(const bool doFullSubsume)
|
||
|
|
{
|
||
|
|
double myTime = cpuTime();
|
||
|
|
uint32_t origTrailSize = solver.trail.size();
|
||
|
|
clauses_subsumed = 0;
|
||
|
|
clauses_cut = 0;
|
||
|
|
clauseID = 0;
|
||
|
|
uint32_t lastNumElimed = numElimed;
|
||
|
|
localSubstituteUseful = 0;
|
||
|
|
while (solver.performReplace && solver.varReplacer->needsReplace()) {
|
||
|
|
if (!solver.varReplacer->performReplace())
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
for (Var var = 0; var < solver.nVars(); var++) {
|
||
|
|
occur[var].clear();
|
||
|
|
}
|
||
|
|
solver.findAllAttach();
|
||
|
|
|
||
|
|
solver.clauseCleaner->cleanClauses(solver.xorclauses, ClauseCleaner::xorclauses);
|
||
|
|
if (!solver.ok) return false;
|
||
|
|
solver.testAllClauseAttach();
|
||
|
|
|
||
|
|
clauses.clear();
|
||
|
|
clauses.reserve(solver.xorclauses.size());
|
||
|
|
addFromSolver(solver.xorclauses);
|
||
|
|
#ifdef BIT_MORE_VERBOSITY
|
||
|
|
std::cout << "c time to link in:" << cpuTime()-myTime << std::endl;
|
||
|
|
#endif
|
||
|
|
|
||
|
|
origNClauses = clauses.size();
|
||
|
|
|
||
|
|
if (!solver.ok) return false;
|
||
|
|
#ifdef VERBOSE_DEBUG
|
||
|
|
std::cout << "c clauses:" << clauses.size() << std::endl;
|
||
|
|
#endif
|
||
|
|
|
||
|
|
bool replaced = true;
|
||
|
|
bool propagated = false;
|
||
|
|
while (replaced || propagated) {
|
||
|
|
replaced = propagated = false;
|
||
|
|
for (uint32_t i = 0; i < clauses.size(); i++) {
|
||
|
|
if (clauses[i].clause != NULL) {
|
||
|
|
subsume0(clauses[i]);
|
||
|
|
if (!solver.ok) {
|
||
|
|
addBackToSolver();
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
propagated = (solver.qhead != solver.trail.size());
|
||
|
|
solver.ok = (solver.propagate() == NULL);
|
||
|
|
if (!solver.ok) {
|
||
|
|
std::cout << "c (contradiction during subsumption)" << std::endl;
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
solver.clauseCleaner->cleanXorClausesBewareNULL(clauses, ClauseCleaner::xorSimpClauses, *this);
|
||
|
|
if (!solver.ok) return false;
|
||
|
|
testAllClauseAttach();
|
||
|
|
|
||
|
|
fillCannotEliminate();
|
||
|
|
if (solver.conglomerateXors && !removeDependent()) {
|
||
|
|
addBackToSolver();
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
testAllClauseAttach();
|
||
|
|
|
||
|
|
if (solver.heuleProcess && !localSubstitute()) {
|
||
|
|
addBackToSolver();
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
testAllClauseAttach();
|
||
|
|
|
||
|
|
/*if (solver.performReplace && solver.varReplacer->needsReplace()) {
|
||
|
|
addBackToSolver();
|
||
|
|
while (solver.performReplace && solver.varReplacer->needsReplace()) {
|
||
|
|
replaced = true;
|
||
|
|
if (!solver.varReplacer->performReplace())
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
addFromSolver(solver.xorclauses);
|
||
|
|
}*/
|
||
|
|
}
|
||
|
|
|
||
|
|
solver.order_heap.filter(Solver::VarFilter(solver));
|
||
|
|
|
||
|
|
removeWrong(solver.learnts);
|
||
|
|
removeWrong(solver.binaryClauses);
|
||
|
|
addBackToSolver();
|
||
|
|
|
||
|
|
if (solver.verbosity >= 1) {
|
||
|
|
std::cout << "c | x-sub: " << std::setw(5) << clauses_subsumed
|
||
|
|
<< " x-cut: " << std::setw(6) << clauses_cut
|
||
|
|
<< " vfix: " << std::setw(6) <<solver.trail.size() - origTrailSize
|
||
|
|
<< " v-elim: " <<std::setw(6) << numElimed - lastNumElimed
|
||
|
|
<< " locsubst:" << std::setw(6) << localSubstituteUseful
|
||
|
|
<< " time: " << std::setw(6) << std::setprecision(2) << (cpuTime() - myTime)
|
||
|
|
<< std::setw(3) << " |" << std::endl;
|
||
|
|
}
|
||
|
|
totalTime += cpuTime() - myTime;
|
||
|
|
|
||
|
|
solver.testAllClauseAttach();
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
|
||
|
|
#ifdef DEBUG_ATTACH
|
||
|
|
void XorSubsumer::testAllClauseAttach() const
|
||
|
|
{
|
||
|
|
for (const XorClauseSimp *it = clauses.getData(), *end = clauses.getDataEnd(); it != end; it++) {
|
||
|
|
if (it->clause == NULL) continue;
|
||
|
|
const XorClause& c = *it->clause;
|
||
|
|
assert(find(solver.xorwatches[c[0].var()], &c));
|
||
|
|
assert(find(solver.xorwatches[c[1].var()], &c));
|
||
|
|
if (solver.assigns[c[0].var()]!=l_Undef || solver.assigns[c[1].var()]!=l_Undef) {
|
||
|
|
for (uint i = 0; i < c.size();i++) {
|
||
|
|
assert(solver.assigns[c[i].var()] != l_Undef);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
#else
|
||
|
|
inline void XorSubsumer::testAllClauseAttach() const
|
||
|
|
{
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
#endif //DEBUG_ATTACH
|
||
|
|
|
||
|
|
void XorSubsumer::findSubsumed(XorClause& ps, vec<XorClauseSimp>& out_subsumed)
|
||
|
|
{
|
||
|
|
#ifdef VERBOSE_DEBUGSUBSUME0
|
||
|
|
cout << "findSubsumed: ";
|
||
|
|
for (uint32_t i = 0; i < ps.size(); i++) {
|
||
|
|
if (ps[i].sign()) printf("-");
|
||
|
|
printf("%d ", ps[i].var() + 1);
|
||
|
|
}
|
||
|
|
printf("0\n");
|
||
|
|
#endif
|
||
|
|
|
||
|
|
uint32_t min_i = 0;
|
||
|
|
for (uint32_t i = 1; i < ps.size(); i++){
|
||
|
|
if (occur[ps[i].var()].size() < occur[ps[min_i].var()].size())
|
||
|
|
min_i = i;
|
||
|
|
}
|
||
|
|
|
||
|
|
vec<XorClauseSimp>& cs = occur[ps[min_i].var()];
|
||
|
|
for (XorClauseSimp *it = cs.getData(), *end = it + cs.size(); it != end; it++){
|
||
|
|
if (it+1 != end)
|
||
|
|
__builtin_prefetch((it+1)->clause, 1, 1);
|
||
|
|
|
||
|
|
if (it->clause != &ps && subsetAbst(ps.getAbst(), it->clause->getAbst()) && ps.size() <= it->clause->size() && subset(ps, *it->clause)) {
|
||
|
|
out_subsumed.push(*it);
|
||
|
|
#ifdef VERBOSE_DEBUGSUBSUME0
|
||
|
|
cout << "subsumed: ";
|
||
|
|
it->clause->plainPrint();
|
||
|
|
#endif
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
const bool XorSubsumer::checkElimedUnassigned() const
|
||
|
|
{
|
||
|
|
for (uint32_t i = 0; i < var_elimed.size(); i++) {
|
||
|
|
if (var_elimed[i]) {
|
||
|
|
assert(solver.assigns[i] == l_Undef);
|
||
|
|
if (solver.assigns[i] != l_Undef) return false;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return true;
|
||
|
|
}
|