mirrors/z3
3
0
Fork 0
mirror of https://github.com/Z3Prover/z3 synced 2025-04-23 00:55:31 +00:00
Code Activity

add some lemma names

Browse source
This commit is contained in:
Jakob Rath 2023-03-11 10:36:02 +01:00
parent d075759659
commit f2ff1145bd
1 changed files with 10 additions and 4 deletions
Download patch file Download diff file Expand all files Collapse all files

14
src/math/polysat/op_constraint.cpp
View file

@ -540,9 +540,12 @@ namespace polysat {
unsigned parity_pv = pv.val().trailing_zeros();
unsigned parity_rv = rv.val().trailing_zeros();
LOG("p: " << p() << " := " << pv << " parity " << parity_pv);
LOG("r: " << r() << " := " << rv << " parity " << parity_rv);
// p != 0 ==> odd(r)
if (parity_rv != 0)
return s.mk_clause(~invc, ~s.eq(p()), s.odd(r()), true);
return s.mk_clause("r = inv p & p != 0 ==> odd(r)", {~invc, ~s.eq(p()), s.odd(r())}, true);
pdd prod = p() * r();
rational prodv = (pv * rv).val();
@ -558,19 +561,22 @@ namespace polysat {
LOG("Its in [" << lower << "; " << upper << ")");
// parity(p) >= k ==> p * r >= 2^k
if (prodv < rational::power_of_two(middle))
return s.mk_clause(~invc, ~s.parity_at_least(p(), middle), s.uge(prod, rational::power_of_two(middle)), false);
return s.mk_clause("r = inv p & parity(p) >= k ==> p*r >= 2^k",
{~invc, ~s.parity_at_least(p(), middle), s.uge(prod, rational::power_of_two(middle))}, false);
}
else { // parity less than middle
upper = middle;
LOG("Its in [" << lower << "; " << upper << ")");
// parity(p) < k ==> p * r <= 2^k - 1
if (prodv > rational::power_of_two(middle))
return s.mk_clause(~invc, s.parity_at_least(p(), middle), s.ule(prod, rational::power_of_two(middle) - 1), false);
return s.mk_clause("r = inv p & parity(p) < k ==> p*r <= 2^k - 1",
{~invc, s.parity_at_least(p(), middle), s.ule(prod, rational::power_of_two(middle) - 1)}, false);
}
// parity(p) < k ==> r <= 2^(N - k) - 1 (because r is the smallest pseudo-inverse)
rational const max_rv = rational::power_of_two(m.power_of_2() - middle) - 1;
if (rv.val() > max_rv)
return s.mk_clause(~invc, s.parity_at_least(p(), middle), s.ule(r(), max_rv), false);
return s.mk_clause("r = inv p & parity(p) < k ==> r <= 2^(N-k) - 1",
{~invc, s.parity_at_least(p(), middle), s.ule(r(), max_rv)}, false);
}
// Why did it evaluate to false in this case?
UNREACHABLE();