mirror of https://github.com/YosysHQ/abc.git
71 lines
1.8 KiB
C++
71 lines
1.8 KiB
C++
#include "global.h"
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#include "internal.hpp"
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ABC_NAMESPACE_IMPL_START
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namespace CaDiCaL {
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void Internal::constrain (int lit) {
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if (lit)
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constraint.push_back (lit);
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else {
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if (level)
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backtrack ();
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LOG (constraint, "shrinking constraint");
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bool satisfied_constraint = false;
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const vector<int>::const_iterator end = constraint.end ();
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vector<int>::iterator i = constraint.begin ();
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for (vector<int>::const_iterator j = i; j != end; j++) {
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int tmp = marked (*j);
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if (tmp > 0) {
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LOG ("removing duplicated literal %d from constraint", *j);
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} else if (tmp < 0) {
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LOG ("tautological since both %d and %d occur in constraint", -*j,
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*j);
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satisfied_constraint = true;
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break;
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} else {
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tmp = val (*j);
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if (tmp < 0) {
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LOG ("removing falsified literal %d from constraint clause", *j);
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} else if (tmp > 0) {
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LOG ("satisfied constraint with literal %d", *j);
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satisfied_constraint = true;
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break;
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} else {
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*i++ = *j;
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mark (*j);
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}
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}
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}
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constraint.resize (i - constraint.begin ());
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for (const auto &lit : constraint)
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unmark (lit);
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if (satisfied_constraint)
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constraint.clear ();
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else if (constraint.empty ()) {
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unsat_constraint = true;
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if (!conflict_id)
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marked_failed = false; // allow to trigger failing ()
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} else
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for (const auto lit : constraint)
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freeze (lit);
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}
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}
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bool Internal::failed_constraint () { return unsat_constraint; }
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void Internal::reset_constraint () {
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for (auto lit : constraint)
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melt (lit);
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LOG ("cleared %zd constraint literals", constraint.size ());
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constraint.clear ();
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unsat_constraint = false;
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marked_failed = true;
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}
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} // namespace CaDiCaL
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ABC_NAMESPACE_IMPL_END
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