417 lines
12 KiB
C++
417 lines
12 KiB
C++
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/***********************************************************************************
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CryptoMiniSat -- Copyright (c) 2009 Mate Soos
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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**************************************************************************************************/
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#include "ClauseCleaner.h"
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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 DEBUG_CLEAN
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//#define VERBOSE_DEBUG
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ClauseCleaner::ClauseCleaner(Solver& _solver) :
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solver(_solver)
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{
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for (uint i = 0; i < 6; i++) {
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lastNumUnitarySat[i] = solver.get_unitary_learnts_num();
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lastNumUnitaryClean[i] = solver.get_unitary_learnts_num();
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}
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}
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void ClauseCleaner::removeSatisfied(vec<XorClause*>& cs, ClauseSetType type, const uint limit)
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{
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#ifdef DEBUG_CLEAN
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assert(solver.decisionLevel() == 0);
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#endif
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if (lastNumUnitarySat[type] + limit >= solver.get_unitary_learnts_num())
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return;
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uint32_t i,j;
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for (i = j = 0; i < cs.size(); i++) {
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if (satisfied(*cs[i]))
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solver.removeClause(*cs[i]);
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else
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cs[j++] = cs[i];
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}
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cs.shrink(i - j);
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lastNumUnitarySat[type] = solver.get_unitary_learnts_num();
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}
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void ClauseCleaner::removeSatisfied(vec<Clause*>& cs, ClauseSetType type, const uint limit)
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{
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#ifdef DEBUG_CLEAN
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assert(solver.decisionLevel() == 0);
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#endif
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if (lastNumUnitarySat[type] + limit >= solver.get_unitary_learnts_num())
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return;
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Clause **i,**j, **end;
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for (i = j = cs.getData(), end = i + cs.size(); i != end; i++) {
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if (i+1 != end)
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__builtin_prefetch(*(i+1), 0, 0);
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if (satisfied(**i))
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solver.removeClause(**i);
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else
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*j++ = *i;
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}
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cs.shrink(i - j);
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lastNumUnitarySat[type] = solver.get_unitary_learnts_num();
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}
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void ClauseCleaner::cleanClauses(vec<Clause*>& cs, ClauseSetType type, const uint limit)
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{
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assert(solver.decisionLevel() == 0);
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assert(solver.qhead == solver.trail.size());
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if (lastNumUnitaryClean[type] + limit >= solver.get_unitary_learnts_num())
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return;
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#ifdef VERBOSE_DEBUG
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std::cout << "Cleaning " << (type==binaryClauses ? "binaryClauses" : "normal clauses" ) << std::endl;
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#endif //VERBOSE_DEBUG
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Clause **s, **ss, **end;
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for (s = ss = cs.getData(), end = s + cs.size(); s != end;) {
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if (s+1 != end)
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__builtin_prefetch(*(s+1), 1, 0);
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if (cleanClause(*s)) {
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clauseFree(*s);
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s++;
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} else if (type != ClauseCleaner::binaryClauses && (*s)->size() == 2) {
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solver.binaryClauses.push(*s);
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solver.becameBinary++;
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s++;
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} else {
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*ss++ = *s++;
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}
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}
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cs.shrink(s-ss);
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lastNumUnitaryClean[type] = solver.get_unitary_learnts_num();
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#ifdef VERBOSE_DEBUG
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cout << "cleanClauses(Clause) useful ?? Removed: " << s-ss << endl;
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#endif
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}
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inline const bool ClauseCleaner::cleanClause(Clause*& cc)
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{
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Clause& c = *cc;
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Lit origLit1 = c[0];
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Lit origLit2 = c[1];
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uint32_t origSize = c.size();
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Lit *i, *j, *end;
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for (i = j = c.getData(), end = i + c.size(); i != end; i++) {
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lbool val = solver.value(*i);
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if (val == l_Undef) {
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*j++ = *i;
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continue;
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}
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if (val == l_True) {
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solver.detachModifiedClause(origLit1, origLit2, origSize, &c);
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return true;
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}
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}
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c.shrink(i-j);
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if (i != j) {
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c.setStrenghtened();
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if (c.size() == 2) {
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solver.detachModifiedClause(origLit1, origLit2, origSize, &c);
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Clause *c2 = Clause_new(c);
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clauseFree(&c);
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cc = c2;
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solver.attachClause(*c2);
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/*} else if (c.size() == 3) {
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solver.detachModifiedClause(origLit1, origLit2, origSize, &c);
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Clause *c2 = Clause_new(c);
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clauseFree(&c);
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cc = c2;
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solver.attachClause(*c2);*/
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} else {
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if (c.learnt())
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solver.learnts_literals -= i-j;
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else
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solver.clauses_literals -= i-j;
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}
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}
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return false;
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}
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void ClauseCleaner::cleanClauses(vec<XorClause*>& cs, ClauseSetType type, const uint limit)
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{
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assert(solver.decisionLevel() == 0);
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assert(solver.qhead == solver.trail.size());
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if (lastNumUnitaryClean[type] + limit >= solver.get_unitary_learnts_num())
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return;
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XorClause **s, **ss, **end;
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for (s = ss = cs.getData(), end = s + cs.size(); s != end; s++) {
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if (s+1 != end)
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__builtin_prefetch(*(s+1), 1, 0);
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#ifdef DEBUG_ATTACH
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assert(find(solver.xorwatches[(**s)[0].var()], *s));
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assert(find(solver.xorwatches[(**s)[1].var()], *s));
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if (solver.assigns[(**s)[0].var()]!=l_Undef || solver.assigns[(**s)[1].var()]!=l_Undef) {
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satisfied(**s);
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}
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#endif //DEBUG_ATTACH
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if (cleanClause(**s)) {
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solver.freeLater.push(*s);
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(*s)->setRemoved();
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} else {
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#ifdef DEBUG_ATTACH
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assert(find(solver.xorwatches[(**s)[0].var()], *s));
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assert(find(solver.xorwatches[(**s)[1].var()], *s));
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#endif //DEBUG_ATTACH
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*ss++ = *s;
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}
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}
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cs.shrink(s-ss);
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lastNumUnitaryClean[type] = solver.get_unitary_learnts_num();
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#ifdef VERBOSE_DEBUG
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cout << "cleanClauses(XorClause) useful: ?? Removed: " << s-ss << endl;
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#endif
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}
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inline const bool ClauseCleaner::cleanClause(XorClause& c)
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{
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Lit *i, *j, *end;
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Var origVar1 = c[0].var();
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Var origVar2 = c[1].var();
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uint32_t origSize = c.size();
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for (i = j = c.getData(), end = i + c.size(); i != end; i++) {
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const lbool& val = solver.assigns[i->var()];
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if (val.isUndef()) {
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*j = *i;
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j++;
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} else c.invert(val.getBool());
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}
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c.shrink(i-j);
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assert(c.size() != 1);
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switch (c.size()) {
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case 0: {
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solver.detachModifiedClause(origVar1, origVar2, origSize, &c);
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return true;
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}
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case 2: {
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c[0] = c[0].unsign();
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c[1] = c[1].unsign();
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solver.varReplacer->replace(c, c.xor_clause_inverted(), c.getGroup());
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solver.detachModifiedClause(origVar1, origVar2, origSize, &c);
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return true;
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}
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default: {
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if (i-j > 0) {
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c.setStrenghtened();
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solver.clauses_literals -= i-j;
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}
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return false;
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}
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}
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assert(false);
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return false;
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}
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void ClauseCleaner::cleanClausesBewareNULL(vec<ClauseSimp>& cs, ClauseCleaner::ClauseSetType type, Subsumer& subs, const uint limit)
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{
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assert(solver.decisionLevel() == 0);
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assert(solver.qhead == solver.trail.size());
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if (lastNumUnitaryClean[type] + limit >= solver.get_unitary_learnts_num())
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return;
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ClauseSimp *s, *end;
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for (s = cs.getData(), end = s + cs.size(); s != end; s++) {
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if (s+1 != end)
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__builtin_prefetch((s+1)->clause, 1, 0);
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if (s->clause == NULL)
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continue;
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if (cleanClauseBewareNULL(*s, subs)) {
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continue;
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} else if (s->clause->size() == 2)
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solver.becameBinary++;
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}
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lastNumUnitaryClean[type] = solver.get_unitary_learnts_num();
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}
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inline const bool ClauseCleaner::cleanClauseBewareNULL(ClauseSimp cc, Subsumer& subs)
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{
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Clause& c = *cc.clause;
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vec<Lit> origClause(c.size());
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memcpy(origClause.getData(), c.getData(), sizeof(Lit)*c.size());
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Lit *i, *j, *end;
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for (i = j = c.getData(), end = i + c.size(); i != end; i++) {
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lbool val = solver.value(*i);
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if (val == l_Undef) {
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*j++ = *i;
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continue;
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}
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if (val == l_True) {
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subs.unlinkModifiedClause(origClause, cc);
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clauseFree(cc.clause);
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return true;
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}
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}
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if (i != j) {
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c.setStrenghtened();
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if (origClause.size() > 2 && origClause.size()-(i-j) == 2) {
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subs.unlinkModifiedClause(origClause, cc);
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subs.clauses[cc.index] = cc;
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c.shrink(i-j);
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solver.attachClause(c);
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subs.linkInAlreadyClause(cc);
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} else {
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c.shrink(i-j);
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subs.unlinkModifiedClauseNoDetachNoNULL(origClause, cc);
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subs.linkInAlreadyClause(cc);
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if (c.learnt())
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solver.learnts_literals -= i-j;
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else
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solver.clauses_literals -= i-j;
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}
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c.calcAbstraction();
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subs.updateClause(cc);
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}
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return false;
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}
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void ClauseCleaner::cleanXorClausesBewareNULL(vec<XorClauseSimp>& cs, ClauseCleaner::ClauseSetType type, XorSubsumer& subs, const uint limit)
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{
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assert(solver.decisionLevel() == 0);
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assert(solver.qhead == solver.trail.size());
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if (lastNumUnitaryClean[type] + limit >= solver.get_unitary_learnts_num())
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return;
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XorClauseSimp *s, *end;
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for (s = cs.getData(), end = s + cs.size(); s != end; s++) {
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if (s+1 != end)
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__builtin_prefetch((s+1)->clause, 1, 0);
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if (s->clause == NULL)
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continue;
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cleanXorClauseBewareNULL(*s, subs);
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}
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lastNumUnitaryClean[type] = solver.get_unitary_learnts_num();
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}
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inline const bool ClauseCleaner::cleanXorClauseBewareNULL(XorClauseSimp cc, XorSubsumer& subs)
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{
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XorClause& c = *cc.clause;
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vec<Lit> origClause(c.size());
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memcpy(origClause.getData(), c.getData(), sizeof(Lit)*c.size());
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Lit *i, *j, *end;
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for (i = j = c.getData(), end = i + c.size(); i != end; i++) {
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const lbool& val = solver.assigns[i->var()];
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if (val.isUndef()) {
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*j = *i;
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j++;
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} else c.invert(val.getBool());
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}
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c.shrink(i-j);
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switch(c.size()) {
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case 0: {
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subs.unlinkModifiedClause(origClause, cc);
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clauseFree(cc.clause);
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return true;
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}
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case 2: {
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vec<Lit> ps(2);
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ps[0] = c[0].unsign();
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ps[1] = c[1].unsign();
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solver.varReplacer->replace(ps, c.xor_clause_inverted(), c.getGroup());
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subs.unlinkModifiedClause(origClause, cc);
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clauseFree(cc.clause);
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||
|
|
return true;
|
||
|
|
}
|
||
|
|
default:
|
||
|
|
if (i-j > 0) {
|
||
|
|
subs.unlinkModifiedClauseNoDetachNoNULL(origClause, cc);
|
||
|
|
subs.linkInAlreadyClause(cc);
|
||
|
|
c.calcXorAbstraction();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
bool ClauseCleaner::satisfied(const Clause& c) const
|
||
|
|
{
|
||
|
|
for (uint i = 0; i != c.size(); i++)
|
||
|
|
if (solver.value(c[i]) == l_True)
|
||
|
|
return true;
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
bool ClauseCleaner::satisfied(const XorClause& c) const
|
||
|
|
{
|
||
|
|
bool final = c.xor_clause_inverted();
|
||
|
|
for (uint k = 0; k != c.size(); k++ ) {
|
||
|
|
const lbool& val = solver.assigns[c[k].var()];
|
||
|
|
if (val.isUndef()) return false;
|
||
|
|
final ^= val.getBool();
|
||
|
|
}
|
||
|
|
return final;
|
||
|
|
}
|
||
|
|
|
||
|
|
void ClauseCleaner::moveBinClausesToBinClauses()
|
||
|
|
{
|
||
|
|
assert(solver.decisionLevel() == 0);
|
||
|
|
assert(solver.qhead == solver.trail.size());
|
||
|
|
|
||
|
|
vec<Clause*>& cs = solver.clauses;
|
||
|
|
Clause **s, **ss, **end;
|
||
|
|
for (s = ss = cs.getData(), end = s + cs.size(); s != end; s++) {
|
||
|
|
if (s+1 != end)
|
||
|
|
__builtin_prefetch(*(s+1), 1, 0);
|
||
|
|
|
||
|
|
if ((**s).size() == 2) {
|
||
|
|
(**s).setUnsorted();
|
||
|
|
solver.binaryClauses.push(*s);
|
||
|
|
} else
|
||
|
|
*ss++ = *s;
|
||
|
|
}
|
||
|
|
cs.shrink(s-ss);
|
||
|
|
}
|