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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2020-02-09 08:38:07 -08:00
parent 2512a958b9
commit 5964969f29
5 changed files with 41 additions and 53 deletions
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24
src/math/lp/int_solver.h
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@ -52,6 +52,7 @@ public:
// methods
int_solver(lar_solver& lp);
// main function to check that the solution provided by lar_solver is valid for integral values,
// or provide a way of how it can be adjusted.
lia_move check(explanation *);
@ -69,31 +70,8 @@ public:
bool at_upper(unsigned j) const;
private:
// how to tighten bounds for integer variables.
bool gcd_test_for_row(static_matrix<mpq, numeric_pair<mpq>> & A, unsigned i);
// gcd test
// 5*x + 3*y + 6*z = 5
// suppose x is fixed at 2.
// so we have 10 + 3(y + 2z) = 5
// 5 = -3(y + 2z)
// this is unsolvable because 5/3 is not an integer.
// so we create a lemma that rules out this condition.
//
bool gcd_test(); // returns false in case of failure. Creates a theory lemma in case of failure.
bool branch(const lp_constraint<mpq, mpq> & new_inequality);
bool ext_gcd_test(const row_strip<mpq>& row,
mpq const & least_coeff,
mpq const & lcm_den,
mpq const & consts);
void fill_explanation_from_fixed_columns(const row_strip<mpq> & row);
void add_to_explanation_from_fixed_or_boxed_column(unsigned j);
lia_move patch_nbasic_columns();
bool get_freedom_interval_for_column(unsigned j, bool & inf_l, impq & l, bool & inf_u, impq & u, mpq & m);
private:
bool is_boxed(unsigned j) const;
bool is_fixed(unsigned j) const;
bool is_free(unsigned j) const;