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merge

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Signed-off-by: Miguel Angelo Da Terra Neves <t-mineve@microsoft.com>
This commit is contained in:
Miguel Angelo Da Terra Neves 2017-12-15 09:51:17 -08:00
commit 2bb2ea59e9
29 changed files with 148 additions and 123 deletions
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50
src/sat/sat_lookahead.cpp
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@ -338,7 +338,7 @@ namespace sat {
}
TRACE("sat", display_candidates(tout << "sum: " << sum << "\n"););
if (skip_candidates > 0) {
IF_VERBOSE(0, verbose_stream() << "candidates: " << m_candidates.size() << " skip: " << skip_candidates << "\n";);
IF_VERBOSE(1, verbose_stream() << "(sat-lookahead :candidates " << m_candidates.size() << " :skipped " << skip_candidates << ")\n";);
}
return sum;
}
@ -2050,15 +2050,15 @@ namespace sat {
return h;
}
lbool lookahead::cube(bool_var_vector const& vars, literal_vector& lits, unsigned backtrack_level) {
lbool lookahead::cube(bool_var_vector& vars, literal_vector& lits, unsigned backtrack_level) {
scoped_ext _scoped_ext(*this);
lits.reset();
m_select_lookahead_vars.reset();
for (auto v : vars) {
m_select_lookahead_vars.insert(v);
}
bool is_first = m_cube_state.m_first;
if (is_first) {
m_select_lookahead_vars.reset();
for (auto v : vars) {
m_select_lookahead_vars.insert(v);
}
init_search();
m_model.reset();
m_cube_state.m_first = false;
@ -2111,6 +2111,8 @@ namespace sat {
#else
lits.append(m_cube_state.m_cube);
#endif
vars.reset();
for (auto v : m_freevars) if (in_reduced_clause(v)) vars.push_back(v);
backtrack(m_cube_state.m_cube, m_cube_state.m_is_decision);
return l_undef;
}
@ -2126,6 +2128,8 @@ namespace sat {
continue;
}
if (lit == null_literal) {
vars.reset();
for (auto v : m_freevars) if (in_reduced_clause(v)) vars.push_back(v);
return l_true;
}
TRACE("sat", tout << "choose: " << lit << " cube: " << m_cube_state.m_cube << "\n";);
@ -2248,40 +2252,6 @@ namespace sat {
return l;
}
literal lookahead::select_lookahead(literal_vector const& assumptions, bool_var_vector const& vars) {
IF_VERBOSE(1, verbose_stream() << "(sat-select " << vars.size() << ")\n";);
scoped_ext _sext(*this);
m_search_mode = lookahead_mode::searching;
scoped_level _sl(*this, c_fixed_truth);
init();
if (inconsistent()) return null_literal;
inc_istamp();
for (auto v : vars) {
m_select_lookahead_vars.insert(v);
}
scoped_assumptions _sa(*this, assumptions);
literal l = choose();
m_select_lookahead_vars.reset();
if (inconsistent()) l = null_literal;
#if 0
// assign unit literals that were found during search for lookahead.
if (assumptions.empty()) {
unsigned num_assigned = 0;
for (literal lit : m_trail) {
if (!m_s.was_eliminated(lit.var()) && m_s.value(lit) != l_true) {
m_s.assign(lit, justification());
++num_assigned;
}
}
IF_VERBOSE(1, verbose_stream() << "(sat-lookahead :units " << num_assigned << ")\n";);
}
#endif
return l;
}
/**
\brief simplify set of clauses by extracting units from a lookahead at base level.
*/