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add variable minimization

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This commit is contained in:
Nikolaj Bjorner 2021-09-22 14:27:05 -07:00
parent c82bbaad7d
commit e6c413b249
6 changed files with 85 additions and 51 deletions
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22
src/math/polysat/constraint.cpp
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@ -122,11 +122,11 @@ namespace polysat {
}
bool signed_constraint::is_currently_false(solver& s) const {
return get()->is_currently_false(s.assignment(), is_positive());
return is_currently_false(s.assignment());
}
bool signed_constraint::is_currently_true(solver& s) const {
return get()->is_currently_true(s.assignment(), is_positive());
return is_currently_true(s.assignment());
}
/** Look up constraint among stored constraints. */
@ -182,20 +182,20 @@ namespace polysat {
return m_constraints.size() > m_num_external + 100;
}
signed_constraint constraint_manager::eq(pdd const& p) {
pdd z = p.manager().zero();
return {dedup(alloc(ule_constraint, *this, p, z)), true};
}
signed_constraint constraint_manager::ule(pdd const& a, pdd const& b) {
return {dedup(alloc(ule_constraint, *this, a, b)), true};
return { dedup(alloc(ule_constraint, *this, a, b)), true };
}
signed_constraint constraint_manager::ult(pdd const& a, pdd const& b) {
// a < b <=> !(b <= a)
return ~ule(b, a);
signed_constraint constraint_manager::eq(pdd const& p) {
return ule(p, p.manager().zero());
}
signed_constraint constraint_manager::ult(pdd const& a, pdd const& b) {
return ~ule(b, a);
}
// To do signed comparison of bitvectors, flip the msb and do unsigned comparison:
//
// x <=s y <=> x + 2^(w-1) <=u y + 2^(w-1)