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roll back in maximize_term if the integrality is broken

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Signed-off-by: Lev Nachmanson <levnach@hotmail.com>
This commit is contained in:
Lev Nachmanson 2020-03-30 13:19:07 -07:00
parent f21b60a6e1
commit cf0952c232
4 changed files with 27 additions and 4 deletions
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8
src/smt/theory_lra.cpp
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@ -3548,6 +3548,9 @@ public:
lp::impq term_max;
lp::lp_status st;
lpvar vi = 0;
if (has_int()) {
lp().backup_x();
}
if (!can_get_bound(v)) {
TRACE("arith", tout << "cannot get bound for v" << v << "\n";);
st = lp::lp_status::UNBOUNDED;
@ -3558,6 +3561,11 @@ public:
else {
vi = get_lpvar(v);
st = lp().maximize_term(vi, term_max);
if (has_int() && lp().has_inf_int()) {
st = lp::lp_status::FEASIBLE;
lp().restore_x();
}
}
switch (st) {
case lp::lp_status::OPTIMAL: {