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enable proof production with difference logic, integrate with PDR engine

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2012-10-20 04:25:58 -07:00
parent 28a4f51ea5
commit 2e73957f97
10 changed files with 500 additions and 385 deletions
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19
lib/static_features.cpp
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@ -130,20 +130,23 @@ bool static_features::is_diff_atom(expr const * e) const {
return false;
SASSERT(to_app(e)->get_num_args() == 2);
expr * lhs = to_app(e)->get_arg(0);
SASSERT(is_numeral(to_app(e)->get_arg(1)));
expr * rhs = to_app(e)->get_arg(1);
if (!is_arith_expr(lhs) && !is_arith_expr(rhs))
return true;
if (!is_numeral(rhs))
return false;
// lhs can be 'x' or '(+ x (* -1 y))'
if (!is_arith_expr(lhs))
return true;
SASSERT(is_app(lhs));
// lhs must be (+ x (* -1 y))
if (to_app(lhs)->get_decl_kind() != OP_ADD || to_app(lhs)->get_num_args() != 2)
return false;
expr* arg1, *arg2;
if (!m_autil.is_add(lhs, arg1, arg2))
return false;
// x
if (is_arith_expr(to_app(lhs)->get_arg(0)))
if (is_arith_expr(arg1))
return false;
expr * arg2 = to_app(lhs)->get_arg(1);
// arg2: (* -1 y)
return m_autil.is_mul(arg2) && to_app(arg2)->get_num_args() == 2 && is_minus_one(to_app(arg2)->get_arg(0)) && !is_arith_expr(to_app(arg2)->get_arg(1));
expr* m1, *m2;
return m_autil.is_mul(arg2, m1, m2) && is_minus_one(m1) && !is_arith_expr(m2);
}
bool static_features::is_gate(expr const * e) const {