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mb-skolem for arithmetic with model repair

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The contract is that users of mb-skolem ensure that
interface equalities are preserved (by adding a
sufficient set of disequalities, such as a chain
x1 < x2 < x3 .., to force that solutions for
x_i does not clash).

Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2018-06-14 17:13:10 -07:00 • committed by Arie Gurfinkel
parent a0af3383db
commit baa96909cc
5 changed files with 34 additions and 13 deletions
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4
src/qe/qe_mbi.cpp
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@ -259,7 +259,7 @@ namespace qe {
app_ref_vector& m_vars;
arith_util arith;
obj_hashtable<func_decl> m_exclude;
is_arith_var_proc(app_ref_vector& vars, func_decl_ref_vector const& shared):
is_arith_var_proc(app_ref_vector& vars, func_decl_ref_vector const& shared):
m(vars.m()), m_vars(vars), arith(m) {
for (func_decl* f : shared) m_exclude.insert(f);
}
@ -484,7 +484,7 @@ namespace qe {
return l_true, mbp of local, mdl of local & blocked
else if !is_sat(local & lits) then
return l_false, mbp of local, nullptr
else // is_sat(local & lits) && !is_sat(local & lits & blocked)
else if is_sat(local & lits) && !is_sat(local & lits & blocked)
MISSING CASE
MUST PRODUCE AN IMPLICANT OF LOCAL that is inconsistent with lits & blocked
in this case !is_sat(local & lits & mdl) and is_sat(mdl, blocked)