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add ovfl constraint

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2021-12-09 09:05:23 -08:00
parent 6ddca4091a
commit 0dcaf9b9f9
5 changed files with 155 additions and 1 deletions
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44
src/math/polysat/mul_ovfl_constraint.h Normal file
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/*++
Copyright (c) 2021 Microsoft Corporation
Module Name:
polysat multiplication overflow constraint
Author:
Jakob Rath, Nikolaj Bjorner (nbjorner) 2021-12-09
--*/
#pragma once
#include "math/polysat/constraint.h"
namespace polysat {
class mul_ovfl_constraint final : public constraint {
friend class constraint_manager;
pdd m_p;
pdd m_q;
mul_ovfl_constraint(constraint_manager& m, pdd const& p, pdd const& q);
void simplify();
bool is_always_false(bool is_positive, pdd const& p, pdd const& q) const;
public:
~mul_ovfl_constraint() override {}
pdd const& p() const { return m_p; }
pdd const& q() const { return m_q; }
std::ostream& display(std::ostream& out, lbool status) const override;
std::ostream& display(std::ostream& out) const override;
bool is_always_false(bool is_positive) const override;
bool is_currently_false(assignment_t const& a, bool is_positive) const override;
bool is_currently_true(assignment_t const& a, bool is_positive) const override;
void narrow(solver& s, bool is_positive) override;
inequality as_inequality(bool is_positive) const override { throw default_exception("is not an inequality"); }
unsigned hash() const override;
bool operator==(constraint const& other) const override;
bool is_eq() const override { return false; }
};
}