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Added function to select the next variable to split on (User-Propagator) (#6096)

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* Added function to select the next variable to split on

* Fixed typo

* Small fixes

* uint -> int
This commit is contained in:
Clemens Eisenhofer 2022-06-19 19:49:25 +02:00 • committed by GitHub
parent f08e3d70a9
commit 2fa60aa43c
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GPG key ID: 4AEE18F83AFDEB23
17 changed files with 255 additions and 104 deletions
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79
src/sat/sat_solver.cpp
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@ -1661,49 +1661,66 @@ namespace sat {
return null_bool_var;
}
bool solver::decide() {
bool_var next = next_var();
if (next == null_bool_var)
return false;
push();
m_stats.m_decision++;
bool solver::guess(bool_var next) {
lbool lphase = m_ext ? m_ext->get_phase(next) : l_undef;
bool phase = lphase == l_true;
if (lphase == l_undef) {
switch (m_config.m_phase) {
if (lphase != l_undef)
return lphase == l_true;
switch (m_config.m_phase) {
case PS_ALWAYS_TRUE:
phase = true;
break;
return true;
case PS_ALWAYS_FALSE:
phase = false;
break;
return false;
case PS_BASIC_CACHING:
phase = m_phase[next];
break;
return m_phase[next];
case PS_FROZEN:
phase = m_best_phase[next];
break;
return m_best_phase[next];
case PS_SAT_CACHING:
if (m_search_state == s_unsat) {
phase = m_phase[next];
}
else {
phase = m_best_phase[next];
}
break;
if (m_search_state == s_unsat)
return m_phase[next];
return m_best_phase[next];
case PS_RANDOM:
phase = (m_rand() % 2) == 0;
break;
return (m_rand() % 2) == 0;
default:
UNREACHABLE();
phase = false;
break;
}
return false;
}
}
literal next_lit(next, !phase);
bool solver::decide() {
bool_var next;
lbool phase = l_undef;
bool is_pos;
bool used_queue = false;
if (!m_ext || !m_ext->get_case_split(next, phase)) {
used_queue = true;
next = next_var();
if (next == null_bool_var)
return false;
}
push();
m_stats.m_decision++;
if (phase == l_undef)
phase = guess(next) ? l_true: l_false;
literal next_lit(next, false);
if (m_ext && m_ext->decide(next, phase)) {
if (used_queue)
m_case_split_queue.unassign_var_eh(next);
next_lit = literal(next, false);
}
if (phase == l_undef)
is_pos = guess(next);
else
is_pos = phase == l_true;
if (!is_pos)
next_lit.neg();
TRACE("sat_decide", tout << scope_lvl() << ": next-case-split: " << next_lit << "\n";);
assign_scoped(next_lit);
return true;