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https://github.com/Z3Prover/z3
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44 lines
1,013 B
C++
44 lines
1,013 B
C++
/*++
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Copyright (c) 2021 Microsoft Corporation
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Module Name:
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Restart
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Author:
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Jakob Rath, Nikolaj Bjorner (nbjorner) 2021-12-12
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--*/
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#include "math/polysat/solver.h"
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#include "math/polysat/restart.h"
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#include "util/luby.h"
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namespace polysat {
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restart::restart(solver& s):
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s(s)
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{}
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/*
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* Basic restart functionality.
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* restarts make more sense when the order of variable
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* assignments and the values assigned to variables can be diversified.
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*/
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bool restart::should_apply() const {
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if (s.m_stats.m_num_conflicts - m_conflicts_at_restart < m_restart_threshold)
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return false;
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if (s.base_level() + 2 > s.m_level)
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return false;
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return true;
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}
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void restart::operator()() {
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++s.m_stats.m_num_restarts;
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s.pop_levels(s.m_level - s.base_level());
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m_conflicts_at_restart = s.m_stats.m_num_conflicts;
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m_restart_threshold = m_restart_init * get_luby(++m_luby_idx);
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}
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}
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