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one more special case

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This commit is contained in:
Jakob Rath 2022-03-10 10:32:23 +01:00
parent 1faccffd0d
commit 22411f8b43
2 changed files with 19 additions and 0 deletions
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1
src/math/polysat/clause_builder.cpp
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@ -61,6 +61,7 @@ namespace polysat {
void clause_builder::push(signed_constraint c) { void clause_builder::push(signed_constraint c) {
SASSERT(c); SASSERT(c);
SASSERT(c->has_bvar()); SASSERT(c->has_bvar());
SASSERT(!c.is_always_false()); // if this case occurs legitimately, we should skip the constraint.
if (c.is_always_true()) { if (c.is_always_true()) {
m_is_tautology = true; m_is_tautology = true;
return; return;

18
src/math/polysat/viable.cpp
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@ -240,6 +240,7 @@ namespace polysat {
* and division with coeff are valid. Is there a more relaxed scheme? * and division with coeff are valid. Is there a more relaxed scheme?
*/ */
bool viable::refine_equal_lin(pvar v, rational const& val) { bool viable::refine_equal_lin(pvar v, rational const& val) {
// LOG_H2("refine-equal-lin with v" << v << ", val = " << val);
auto* e = m_equal_lin[v]; auto* e = m_equal_lin[v];
if (!e) if (!e)
return true; return true;
@ -283,8 +284,25 @@ namespace polysat {
} }
}; };
do { do {
LOG("refine-equal-lin for src: " << e->src);
rational coeff_val = mod(e->coeff * val, mod_value); rational coeff_val = mod(e->coeff * val, mod_value);
if (e->interval.currently_contains(coeff_val)) { if (e->interval.currently_contains(coeff_val)) {
if (e->interval.lo_val().is_one() && e->interval.hi_val().is_zero() && e->coeff.is_odd()) {
rational lo(1);
rational hi(0);
LOG("refine-equal-lin: " << " [" << lo << ", " << hi << "[");
pdd lop = s.var2pdd(v).mk_val(lo);
pdd hip = s.var2pdd(v).mk_val(hi);
entry* ne = alloc_entry();
ne->src = e->src;
ne->side_cond = e->side_cond;
ne->coeff = 1;
ne->interval = eval_interval::proper(lop, lo, hip, hi);
intersect(v, ne);
return false;
}
rational lo = val - delta_l(coeff_val); rational lo = val - delta_l(coeff_val);
rational hi = val + delta_u(coeff_val) + 1; rational hi = val + delta_u(coeff_val) + 1;