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add shortcuts in rewriter, eliminate redundancies in dependent_expr tactic

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This commit is contained in:
Nikolaj Bjorner 2022-11-15 09:13:13 -08:00
parent bfae8b2162
commit 9845c33236
5 changed files with 50 additions and 25 deletions
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12
src/ast/rewriter/bool_rewriter.cpp
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@ -686,6 +686,10 @@ br_status bool_rewriter::try_ite_value(app * ite, app * val, expr_ref & result)
app* bool_rewriter::mk_eq(expr* lhs, expr* rhs) {
if (m().are_distinct(lhs, rhs))
return m().mk_false();
if (lhs == rhs)
return m().mk_true();
// degrades simplification
// if (lhs->get_id() > rhs->get_id()) std::swap(lhs, rhs);
return m().mk_eq(lhs, rhs);
@ -785,7 +789,7 @@ br_status bool_rewriter::mk_distinct_core(unsigned num_args, expr * const * args
if (num_args == 2) {
expr_ref tmp(m());
result = m().mk_not(mk_eq(args[0], args[1]));
result = mk_not(mk_eq(args[0], args[1]));
return BR_REWRITE2; // mk_eq may be dispatched to other rewriters.
}
@ -827,7 +831,7 @@ br_status bool_rewriter::mk_distinct_core(unsigned num_args, expr * const * args
ptr_buffer<expr> new_diseqs;
for (unsigned i = 0; i < num_args; i++) {
for (unsigned j = i + 1; j < num_args; j++)
new_diseqs.push_back(m().mk_not(mk_eq(args[i], args[j])));
new_diseqs.push_back(mk_not(mk_eq(args[i], args[j])));
}
result = m().mk_and(new_diseqs);
return BR_REWRITE3;
@ -937,13 +941,13 @@ br_status bool_rewriter::mk_ite_core(expr * c, expr * t, expr * e, expr_ref & re
if (m().is_not(t, t1) && m().is_eq(t1, t1, t2) && e == t1) {
expr_ref a(m());
mk_and(c, t2, a);
result = m().mk_not(m().mk_eq(t1, a));
result = mk_not(mk_eq(t1, a));
return BR_REWRITE3;
}
if (m().is_not(t, t1) && m().is_eq(t1, t2, t1) && e == t1) {
expr_ref a(m());
mk_and(c, t2, a);
result = m().mk_eq(t1, a);
result = mk_eq(t1, a);
return BR_REWRITE3;
}
#endif