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fix bugs exposed in #677. to_int(x) has the semantics that to_int(x) <= x, and to_int(x) is the largest integer satisfying this inequality. The encoding in purify_arith had it the other way x <= to_int(x) contrary to how to_int(x) is handled elsewhere. Another bug in theory_arith for mixed-integer linear case was also exposed. Fractional bounds on expressions of the form to_int(x), and more generally on integer rows were not rounded prior to internalization

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2016-07-13 20:32:18 -07:00
parent 63f89f8c45
commit 3989d238c0
8 changed files with 78 additions and 40 deletions
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4
src/smt/theory_arith_int.h
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@ -1267,11 +1267,11 @@ namespace smt {
final_check_status theory_arith<Ext>::check_int_feasibility() {
TRACE("arith_int_detail", get_context().display(tout););
if (!has_infeasible_int_var()) {
TRACE("arith_int_incomp", tout << "FC_DONE 1...\n"; display(tout););
TRACE("arith", tout << "FC_DONE 1...\n"; display(tout););
return FC_DONE;
}
TRACE("arith_int_fracs",
TRACE("arith",
int num = get_num_vars();
for (theory_var v = 0; v < num; v++) {
if (is_int(v) && !get_value(v).is_int()) {