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working on #5614

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there are some different sources for the performance regression illustrated by the example. The mitigations will be enabled separately:
- m_bv_to_propagate is too expensive
- lp_bound_propagator misses equalities in two different ways:
   - it resets row checks after backtracking even though they could still propagate
   - it misses equalities for fixed rows when the fixed constant value does not correspond to a fixed variable.

FYI @levnach
This commit is contained in:
Nikolaj Bjorner 2021-11-02 14:55:28 -07:00
parent a94e2e62af
commit 87d4ce2659
13 changed files with 422 additions and 385 deletions
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8
src/math/lp/lp_settings.h
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@ -126,7 +126,7 @@ struct statistics {
unsigned m_cross_nested_forms;
unsigned m_grobner_calls;
unsigned m_grobner_conflicts;
unsigned m_cheap_eqs;
unsigned m_offset_eqs;
statistics() { reset(); }
void reset() { memset(this, 0, sizeof(*this)); }
void collect_statistics(::statistics& st) const {
@ -147,7 +147,7 @@ struct statistics {
st.update("arith-horner-cross-nested-forms", m_cross_nested_forms);
st.update("arith-grobner-calls", m_grobner_calls);
st.update("arith-grobner-conflicts", m_grobner_conflicts);
st.update("arith-cheap-eqs", m_cheap_eqs);
st.update("arith-offset-eqs", m_offset_eqs);
}
};
@ -242,10 +242,10 @@ private:
unsigned m_nlsat_delay;
bool m_enable_hnf { true };
bool m_print_external_var_name { false };
bool m_cheap_eqs { false };
bool m_propagate_eqs { false };
public:
bool print_external_var_name() const { return m_print_external_var_name; }
bool cheap_eqs() const { return m_cheap_eqs;}
bool propagate_eqs() const { return m_propagate_eqs;}
unsigned hnf_cut_period() const { return m_hnf_cut_period; }
void set_hnf_cut_period(unsigned period) { m_hnf_cut_period = period; }
unsigned random_next() { return m_rand(); }