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fix #4471

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2020-05-27 14:19:59 -07:00
parent f0178a87f5
commit 56bf4c144b
1 changed files with 14 additions and 4 deletions
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18
src/smt/theory_lra.cpp
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@ -1327,12 +1327,22 @@ public:
expr_ref mod(a.mk_mod(p, q), m);
expr_ref zero(a.mk_int(0), m);
if (a.is_zero(p)) {
// q != 0 => (= (div 0 q) 0)
// q != 0 => (= (mod 0 q) 0)
literal q_ge_0 = mk_literal(a.mk_ge(q, zero));
literal q_le_0 = mk_literal(a.mk_le(q, zero));
mk_axiom(~q_ge_0, ~q_le_0, mk_literal(a.mk_ge(div, zero)));
mk_axiom(~q_ge_0, ~q_le_0, mk_literal(a.mk_le(div, zero)));
mk_axiom(~q_ge_0, ~q_le_0, mk_literal(a.mk_ge(mod, zero)));
mk_axiom(~q_ge_0, ~q_le_0, mk_literal(a.mk_le(mod, zero)));
literal d_ge_0 = mk_literal(a.mk_ge(div, zero));
literal d_le_0 = mk_literal(a.mk_le(div, zero));
literal m_ge_0 = mk_literal(a.mk_ge(mod, zero));
literal m_le_0 = mk_literal(a.mk_le(mod, zero));
mk_axiom(q_ge_0, d_ge_0);
mk_axiom(q_ge_0, d_le_0);
mk_axiom(q_ge_0, m_ge_0);
mk_axiom(q_ge_0, m_le_0);
mk_axiom(q_le_0, d_ge_0);
mk_axiom(q_le_0, d_le_0);
mk_axiom(q_le_0, m_ge_0);
mk_axiom(q_le_0, m_le_0);
return;
}
literal eq = th.mk_eq(a.mk_add(a.mk_mul(q, div), mod), p, false);