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add built-in support for bvor: the rewriter converts bitwise and to bit-wise or so using bvor as a basis makes better sense

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2024-01-10 10:16:31 -08:00
parent e2c5d7d358
commit e7c9c5f7a2
10 changed files with 279 additions and 137 deletions
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12
src/sat/smt/polysat/constraints.cpp
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@ -63,6 +63,12 @@ namespace polysat {
return signed_constraint(ckind_t::op_t, cnstr);
}
signed_constraint constraints::bor(pdd const& a, pdd const& b, pdd const& r) {
auto* cnstr = alloc(op_constraint, op_constraint::code::or_op, a, b, r);
c.trail().push(new_obj_trail(cnstr));
return signed_constraint(ckind_t::op_t, cnstr);
}
// parity p >= k if low order k bits of p are 0
signed_constraint constraints::parity_at_least(pdd const& p, unsigned k) {
if (k == 0)
@ -82,6 +88,12 @@ namespace polysat {
return eq(p * rational::power_of_two(N - k));
}
// 2^{N-i-1}* p >= 2^{N-1}
signed_constraint constraints::bit(pdd const& p, unsigned i) {
unsigned N = p.manager().power_of_2();
return uge(p * rational::power_of_two(N - i - 1), rational::power_of_two(N - 1));
}
bool signed_constraint::is_eq(pvar& v, rational& val) {
if (m_sign)
return false;