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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2021-11-26 18:27:44 +01:00
parent fc6e127cca
commit 7b85afbe9c
4 changed files with 20 additions and 5 deletions
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14
src/math/polysat/explain.cpp
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@ -48,7 +48,21 @@ namespace polysat {
// Try to replace it with a new false constraint (derived from superposition with a true constraint)
lbool ex_polynomial_superposition::find_replacement(signed_constraint c2, pvar v, conflict& core) {
vector<signed_constraint> premises;
// TBD: replacement can be obtained from stack not just core.
// see test_l5. Exposes unsoundness bug: a new consequence is derived
// after some variable decision was already processed. Then the
// behavior of evaluating literals "is_currently_true" and bvalue
// uses the full search stack
#if 0
for (auto si : s.m_search) {
if (!si.is_boolean())
continue;
auto c1 = s.lit2cnstr(si.lit());
#else
for (auto c1 : core) {
#endif
if (!is_positive_equality_over(v, c1))
continue;
if (!c1.is_currently_true(s))