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working on viable explanations

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2024-01-02 16:20:13 -08:00
parent b706434282
commit 21236dc80a
5 changed files with 53 additions and 23 deletions
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17
src/sat/smt/polysat_solver.cpp
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@ -383,25 +383,24 @@ namespace polysat {
expr_ref solver::constraint2expr(signed_constraint const& sc) {
expr_ref result(m);
switch (sc.op()) {
case ckind_t::ule_t: {
case ckind_t::ule_t: {
auto p = sc.to_ule().lhs();
auto q = sc.to_ule().rhs();
pdd x = p, r = p;
if (q.is_zero() && p.has_unit(x, r)) {
pdd x = p;
if (q.is_zero() && p.has_unit(x)) {
auto l = pdd2expr(x);
auto h = pdd2expr(-r);
result = m.mk_eq(l, h);
auto r = pdd2expr(x - p);
result = m.mk_eq(l, r);
}
else {
auto l = pdd2expr(p);
auto h = pdd2expr(q);
auto r = pdd2expr(q);
if (p == q)
result = m.mk_true();
else if (q.is_zero())
result = m.mk_eq(l, h);
result = m.mk_eq(l, r);
else
result = bv.mk_ule(l, h);
result = bv.mk_ule(l, r);
}
if (sc.sign())
result = m.mk_not(result);