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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2023-12-13 08:17:21 -08:00
parent 9a933e29e3
commit 4de4618f5b
4 changed files with 25 additions and 17 deletions
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34
src/sat/smt/polysat/core.cpp
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@ -74,11 +74,13 @@ namespace polysat {
if (vars.size() > 0) verbose_stream() << "(" << c.m_constraint_index.size() -1 << ": " << c.m_watch[vars[0]] << ") ";
if (vars.size() > 1) verbose_stream() << "(" << c.m_constraint_index.size() -1 << ": " << c.m_watch[vars[1]] << ") ";
verbose_stream() << "\n");
SASSERT(vars.size() <= 0 || c.m_watch[vars[0]].back() == c.m_constraint_index.size() - 1);
SASSERT(vars.size() <= 1 || c.m_watch[vars[1]].back() == c.m_constraint_index.size() - 1);
if (vars.size() > 0)
unsigned n = sc.num_watch();
SASSERT(n <= vars.size());
SASSERT(n <= 0 || c.m_watch[vars[0]].back() == c.m_constraint_index.size() - 1);
SASSERT(n <= 1 || c.m_watch[vars[1]].back() == c.m_constraint_index.size() - 1);
if (n > 0)
c.m_watch[vars[0]].pop_back();
if (vars.size() > 1)
if (n > 1)
c.m_watch[vars[1]].pop_back();
c.m_constraint_index.pop_back();
}
@ -138,9 +140,10 @@ namespace polysat {
for (; i < sz && j < 2; ++i)
if (!is_assigned(vars[i]))
std::swap(vars[i], vars[j++]);
if (vars.size() > 0)
sc.set_num_watch(i);
if (i > 0)
add_watch(idx, vars[0]);
if (vars.size() > 1)
if (i > 1)
add_watch(idx, vars[1]);
IF_VERBOSE(10, verbose_stream() << "add watch " << sc << " " << vars << " ";
if (vars.size() > 0) verbose_stream() << "( " << idx << " : " << m_watch[vars[0]] << ") ";
@ -225,19 +228,12 @@ namespace polysat {
s.trail().push(mk_assign_var(v, *this));
return;
// to debug:
unsigned sz = m_watch[v].size();
for (unsigned i = 0; i < sz; ++i) {
auto idx = m_watch[v][i];
auto [sc, dep, value] = m_constraint_index[idx];
sc.propagate(*this, value, dep);
}
// update the watch lists for pvars
// remove constraints from m_watch[v] that have more than 2 free variables.
// for entries where there is only one free variable left add to viable set
unsigned j = 0;
for (auto idx : m_watch[v]) {
unsigned j = 0, sz = m_watch[v].size();
for (unsigned k = 0; k < sz; ++k) {
auto idx = m_watch[v][k];
auto [sc, dep, value] = m_constraint_index[idx];
auto& vars = sc.vars();
if (vars[0] != v)
@ -253,6 +249,11 @@ namespace polysat {
break;
}
}
// this can create fresh literals and update m_watch, but
// will not update m_watch[v] (other than copy constructor for m_watch)
// because v has been assigned a value.
sc.propagate(*this, value, dep);
SASSERT(!swapped || vars.size() <= 1 || (!is_assigned(vars[0]) && !is_assigned(vars[1])));
if (swapped)
@ -267,6 +268,7 @@ namespace polysat {
// detect unitary, add to viable, detect conflict?
m_viable.add_unitary(v1, idx);
}
SASSERT(m_watch[v].size() == sz && "size of watch list was not changed");
m_watch[v].shrink(j);
verbose_stream() << "new watch " << v << ": " << m_watch[v] << "\n";
}