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81 lines
2 KiB
C++
81 lines
2 KiB
C++
/*++
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Copyright (c) 2011 Microsoft Corporation
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Module Name:
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sat_scc.h
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Abstract:
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Use binary clauses to compute strongly connected components.
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Author:
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Leonardo de Moura (leonardo) 2011-05-26.
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Revision History:
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--*/
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#ifndef SAT_SCC_H_
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#define SAT_SCC_H_
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#include "sat/sat_types.h"
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#include "util/statistics.h"
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#include "util/params.h"
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namespace sat {
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class solver;
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class scc {
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struct report;
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solver & m_solver;
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// config
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bool m_scc;
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bool m_scc_tr;
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// stats
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unsigned m_num_elim;
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unsigned m_num_elim_bin;
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random_gen m_rand;
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// BIG state:
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vector<literal_vector> m_dag;
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svector<bool> m_roots;
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svector<int> m_left, m_right;
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literal_vector m_root, m_parent;
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void reduce_tr();
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unsigned reduce_tr(bool learned);
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void init_dfs_num(bool learned);
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struct pframe;
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bool reaches_aux(literal u, literal v) const { return m_left[u.index()] < m_left[v.index()] && m_right[v.index()] < m_right[u.index()]; }
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public:
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scc(solver & s, params_ref const & p);
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unsigned operator()();
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void updt_params(params_ref const & p);
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static void collect_param_descrs(param_descrs & d);
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void collect_statistics(statistics & st) const;
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void reset_statistics();
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/*
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\brief create binary implication graph and associated data-structures to check transitivity.
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*/
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void init_big(bool learned);
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void ensure_big(bool learned) { if (m_left.empty()) init_big(learned); }
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int get_left(literal l) const { return m_left[l.index()]; }
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int get_right(literal l) const { return m_right[l.index()]; }
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literal get_parent(literal l) const { return m_parent[l.index()]; }
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literal get_root(literal l) const { return m_root[l.index()]; }
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bool reaches(literal u, literal v) const { return reaches_aux(u, v) || reaches_aux(~v, ~u); }
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};
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};
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#endif
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