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viable propagation reason part 2 (explain equivalent pvars)

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This commit is contained in:
Jakob Rath 2023-12-21 14:58:10 +01:00
parent 2ae91beb83
commit bb49c71ba9
1 changed files with 10 additions and 0 deletions
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10
src/math/polysat/viable.cpp
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@ -211,6 +211,8 @@ namespace polysat {
m_propagation_reason_storage.push_back(c.blit());
};
uint_set vars_to_explain;
// NOTE: all propagations must be justified by a prefix of \Gamma,
// otherwise dependencies may be missed during conflict resolution.
// The propagation reason for v := val consists of the following constraints:
@ -227,6 +229,14 @@ namespace polysat {
// NOTE: use s.eval(i.lo()) instead of i.lo_val() because when reducing interval bit-width, we adapt the values but not the PDDs
add_reason(s.eq(i.lo(), s.eval(i.lo())));
add_reason(s.eq(i.hi(), s.eval(i.hi())));
if (e->var != v)
vars_to_explain.insert(e->var);
}
for (pvar x : vars_to_explain) {
s.m_slicing.explain_simple_overlap(v, x, [this, &add_reason](sat::literal l) {
add_reason(s.lit2cnstr(l));
});
}
unsigned const len = m_propagation_reason_storage.size() - begin;