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56 lines
1.9 KiB
C++
56 lines
1.9 KiB
C++
/*++
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Copyright (c) 2021 Microsoft Corporation
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Module Name:
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polysat multiplication overflow constraint
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Author:
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Jakob Rath, Nikolaj Bjorner (nbjorner) 2021-12-09
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--*/
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#pragma once
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#include "sat/smt/polysat/constraints.h"
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namespace polysat {
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class umul_ovfl_constraint final : public constraint {
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pdd m_p;
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pdd m_q;
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void simplify();
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static bool is_always_true(bool is_positive, pdd const& p, pdd const& q) { return eval(p, q) == to_lbool(is_positive); }
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static bool is_always_false(bool is_positive, pdd const& p, pdd const& q) { return is_always_true(!is_positive, p, q); }
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static lbool eval(pdd const& p, pdd const& q);
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bool narrow_bound(core& c, bool is_positive, pdd const& p0, pdd const& q0, pdd const& p, pdd const& q, dependency const& d);
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public:
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umul_ovfl_constraint(pdd const& p, pdd const& q);
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~umul_ovfl_constraint() override {}
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pdd const& p() const { return m_p; }
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pdd const& q() const { return m_q; }
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std::ostream& display(std::ostream& out, lbool status) const override;
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std::ostream& display(std::ostream& out) const override;
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lbool eval() const override;
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lbool eval(assignment const& a) const override;
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void activate(core& c, bool sign, dependency const& dep) override;
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void propagate(core& c, lbool value, dependency const& dep) override;
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bool is_linear() const override { return p().is_linear_or_value() && q().is_linear_or_value(); }
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};
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class umul_ovfl {
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constraint_id m_id;
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signed_constraint sc;
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public:
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umul_ovfl(constraint_id id, signed_constraint sc) : m_id(id), sc(sc) {}
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pdd p() const { return sc.to_umul_ovfl().p(); }
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pdd q() const { return sc.to_umul_ovfl().q(); }
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bool sign() const { return sc.sign(); }
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constraint_id id() const { return m_id; }
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};
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}
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