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annotate arith_sls

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This commit is contained in:
Nikolaj Bjorner 2023-02-12 20:55:44 -08:00
parent bb81bc5452
commit 7956cf1201
3 changed files with 16 additions and 5 deletions
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13
src/sat/smt/arith_sls.cpp
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@ -90,6 +90,7 @@ namespace arith {
rational new_value_(new_value, rational::i64());
lp::impq val(new_value_, rational::zero());
s.lp().set_value_for_nbasic_column(vj.index(), val);
// TODO - figure out why this leads to unsound (unsat).
}
}
}
@ -147,6 +148,11 @@ namespace arith {
}
}
//
// dtt is high overhead. It walks ineq.m_args
// m_vars[w].m_value can be computed outside and shared among calls
// different data-structures for storing coefficients
//
int64_t sls::dtt(ineq const& ineq, var_t v, int64_t new_value) const {
auto new_args_value = ineq.m_args_value;
for (auto const& [coeff, w] : ineq.m_args) {
@ -302,6 +308,12 @@ namespace arith {
return score;
}
//
// cm_score is costly. It involves several cache misses.
// Note that
// - m_bool_search->get_use_list(lit).size() is "often" 1 or 2
// - dtt_old can be saved
//
int sls::cm_score(var_t v, int64_t new_value) {
int score = 0;
auto& vi = m_vars[v];
@ -309,6 +321,7 @@ namespace arith {
auto const& ineq = *atom(lit);
int64_t dtt_old = dtt(ineq);
int64_t dtt_new = dtt(ineq, v, new_value);
for (auto cl : m_bool_search->get_use_list(lit)) {
auto const& clause = get_clause_info(cl);
if (!clause.is_true()) {