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bailout

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This commit is contained in:
Jakob Rath 2021-09-06 15:16:13 +02:00
parent 56b33b1b3e
commit 39d42913cf
4 changed files with 13 additions and 18 deletions
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9
src/math/polysat/conflict_core.h
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@ -35,6 +35,9 @@ namespace polysat {
// The drawback is that we may get weaker lemmas in some cases (but they are still correct).
// For example: if we have 4x+y=2 and y=0, then we have a conflict no matter the value of x, so we should drop x=? from the core.
/** Whether we are in a bailout state. We enter a bailout state when we give up on proper conflict resolution. */
bool m_bailout = false;
solver* m_solver = nullptr;
constraint_manager& cm();
scoped_ptr_vector<variable_elimination_engine> ve_engines;
@ -50,7 +53,8 @@ namespace polysat {
bool needs_model() const { return m_needs_model; }
pvar conflict_var() const { return m_conflict_var; }
bool is_bailout() const { return m_constraints.size() == 1 && !m_constraints[0]; }
bool is_bailout() const { return m_bailout; }
void set_bailout() { m_bailout = true; }
bool empty() const {
return m_constraints.empty() && !m_needs_model && m_conflict_var == null_var;
@ -61,11 +65,10 @@ namespace polysat {
m_needs_model = false;
m_conflict_var = null_var;
m_saturation_premises.reset();
m_bailout = false;
SASSERT(empty());
}
/** for bailing out with a conflict at the base level */
void set(std::nullptr_t);
/** conflict because the constraint c is false under current variable assignment */
void set(signed_constraint c);
/** conflict because there is no viable value for the variable v */