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better branching with usage_in_terms()

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Signed-off-by: Lev Nachmanson <levnach@hotmail.com>
This commit is contained in:
Lev Nachmanson 2020-04-27 12:48:30 -07:00
parent 3bbf1474f3
commit ba40a5752f
4 changed files with 28 additions and 34 deletions
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9
src/math/lp/lar_solver.h
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@ -101,6 +101,7 @@ class lar_solver : public column_namer {
std::unordered_map<lar_term, std::pair<mpq, unsigned>, term_hasher, term_comparer>
m_normalized_terms_to_columns;
vector<impq> m_backup_x;
stacked_vector<unsigned> m_usage_in_terms;
// end of fields
////////////////// methods ////////////////////////////////
@ -467,9 +468,13 @@ public:
return -1;
}
}
unsigned usage_in_terms(column_index j) const {
if (j >= m_usage_in_terms.size())
return 0;
return m_usage_in_terms[j];
}
friend int_solver;
friend int_branch;
};
}