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better behavior on disequality and branch selection (#4605)

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* better behavior on disequality and branch selection

Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>

* fix loop

Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2020-07-31 01:14:11 -07:00 • committed by GitHub
parent e0d4669116
commit 3f862cb2ee
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5 changed files with 52 additions and 80 deletions
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src/smt/theory_seq.h
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@ -431,7 +431,7 @@ namespace smt {
bool check_length_coherence(expr* e);
bool fixed_length(bool is_zero = false);
bool fixed_length(expr* e, bool is_zero);
void branch_unit_variable(dependency* dep, expr* X, expr_ref_vector const& units);
bool branch_unit_variable(dependency* dep, expr* X, expr_ref_vector const& units);
bool branch_variable_eq(eq const& e);
bool branch_binary_variable(eq const& e);
bool can_align_from_lhs(expr_ref_vector const& ls, expr_ref_vector const& rs);
@ -536,7 +536,7 @@ namespace smt {
bool find_branch_candidate(unsigned& start, dependency* dep, expr_ref_vector const& ls, expr_ref_vector const& rs);
expr_ref_vector expand_strings(expr_ref_vector const& es);
bool can_be_equal(unsigned szl, expr* const* ls, unsigned szr, expr* const* rs) const;
lbool assume_equality(expr* l, expr* r);
bool assume_equality(expr* l, expr* r);
// variable solving utilities
bool occurs(expr* a, expr* b);