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clause_builder should not fail on always-true literals

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Otherwise, e.g. when adding axioms, the caller would have to check each literal before adding it.
This commit is contained in:
Jakob Rath 2022-01-18 10:22:24 +01:00
parent ebc4df1ece
commit e005838129
5 changed files with 21 additions and 4 deletions
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10
src/math/polysat/clause_builder.cpp
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@ -28,10 +28,15 @@ namespace polysat {
void clause_builder::reset() {
m_literals.reset();
m_is_tautology = false;
SASSERT(empty());
}
clause_ref clause_builder::build() {
if (m_is_tautology) {
reset();
return nullptr;
}
std::sort(m_literals.data(), m_literals.data() + m_literals.size());
sat::literal prev = sat::null_literal;
unsigned j = 0;
@ -56,7 +61,10 @@ namespace polysat {
void clause_builder::push(signed_constraint c) {
SASSERT(c);
SASSERT(c->has_bvar());
SASSERT(!c.is_always_true()); // clause would be a tautology
if (c.is_always_true()) {
m_is_tautology = true;
return;
}
#if 0
if (c->unit_clause()) {
return;