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add equality propagation based on partial length information to sequence theory. Fix issue #429

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2016-02-04 08:12:46 -08:00
parent 9b979b6e1e
commit 9c7e5c37d1
8 changed files with 200 additions and 44 deletions
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6
src/smt/theory_seq.h
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@ -335,7 +335,8 @@ namespace smt {
bool propagate_max_length(expr* l, expr* r, dependency* dep);
bool get_length(expr* s, expr_ref& len, literal_vector& lits);
bool reduce_length(expr* l, expr* r);
bool reduce_length(expr* l, expr* r, literal_vector& lits);
bool reduce_length_eq(expr_ref_vector const& ls, expr_ref_vector const& rs, dependency* deps);
expr_ref mk_empty(sort* s) { return expr_ref(m_util.str.mk_empty(s), m); }
expr_ref mk_concat(unsigned n, expr*const* es) { return expr_ref(m_util.str.mk_concat(n, es), m); }
@ -365,7 +366,7 @@ namespace smt {
void propagate_lit(dependency* dep, unsigned n, literal const* lits, literal lit);
void propagate_eq(dependency* dep, enode* n1, enode* n2);
void propagate_eq(literal lit, expr* e1, expr* e2, bool add_to_eqs);
void propagate_eq(literal_vector const& lits, expr* e1, expr* e2, bool add_to_eqs);
void propagate_eq(dependency* dep, literal_vector const& lits, expr* e1, expr* e2, bool add_to_eqs);
void set_conflict(dependency* dep, literal_vector const& lits = literal_vector());
u_map<unsigned> m_branch_start;
@ -384,6 +385,7 @@ namespace smt {
bool is_tail(expr* a, expr*& s, unsigned& idx) const;
bool is_eq(expr* e, expr*& a, expr*& b) const;
bool is_pre(expr* e, expr*& s, expr*& i);
bool is_post(expr* e, expr*& s, expr*& i);
expr_ref mk_nth(expr* s, expr* idx);
expr_ref mk_last(expr* e);
expr_ref mk_first(expr* e);