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simplify models

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2014-09-06 20:54:16 -07:00
parent 36816e3b2f
commit dd62ca5eb3
1 changed files with 24 additions and 5 deletions
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29
src/muz/pdr/pdr_context.cpp
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@ -47,6 +47,7 @@ Notes:
#include "dl_boogie_proof.h"
#include "qe_util.h"
#include "scoped_proof.h"
#include "expr_safe_replace.h"
namespace pdr {
@ -1062,10 +1063,7 @@ namespace pdr {
predicates.pop_back();
for (unsigned i = rule->get_uninterpreted_tail_size(); i < rule->get_tail_size(); ++i) {
subst.apply(2, deltas, expr_offset(rule->get_tail(i), 1), tmp);
dctx.get_rewriter()(tmp);
if (!m.is_true(tmp)) {
constraints.push_back(tmp);
}
constraints.push_back(tmp);
}
for (unsigned i = 0; i < constraints.size(); ++i) {
max_var = std::max(vc.get_max_var(constraints[i].get()), max_var);
@ -1088,7 +1086,28 @@ namespace pdr {
children.append(n->children());
}
return pm.mk_and(constraints);
expr_safe_replace repl(m);
for (unsigned i = 0; i < constraints.size(); ++i) {
expr* e = constraints[i].get(), *e1, *e2;
if (m.is_eq(e, e1, e2) && is_var(e1) && is_ground(e2)) {
repl.insert(e1, e2);
}
else if (m.is_eq(e, e1, e2) && is_var(e2) && is_ground(e1)) {
repl.insert(e2, e1);
}
}
expr_ref_vector result(m);
for (unsigned i = 0; i < constraints.size(); ++i) {
expr_ref tmp(m);
tmp = constraints[i].get();
repl(tmp);
dctx.get_rewriter()(tmp);
if (!m.is_true(tmp)) {
result.push_back(tmp);
}
}
return pm.mk_and(result);
}
proof_ref model_search::get_proof_trace(context const& ctx) {