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remove iff

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2018-05-16 18:35:38 -07:00 • committed by Arie Gurfinkel
parent ecf15ab07d
commit ff0f257102
47 changed files with 199 additions and 264 deletions
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18
src/smt/expr_context_simplifier.cpp
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@ -110,13 +110,15 @@ void expr_context_simplifier::reduce_rec(app * a, expr_ref & result) {
case OP_OR:
reduce_or(a->get_num_args(), a->get_args(), result);
return;
case OP_IFF: {
expr_ref tmp1(m_manager), tmp2(m_manager);
reduce_rec(a->get_arg(0), tmp1);
reduce_rec(a->get_arg(1), tmp2);
m_simp.mk_iff(tmp1.get(), tmp2.get(), result);
return;
}
case OP_EQ:
if (m_manager.is_iff(a)) {
expr_ref tmp1(m_manager), tmp2(m_manager);
reduce_rec(a->get_arg(0), tmp1);
reduce_rec(a->get_arg(1), tmp2);
m_simp.mk_iff(tmp1.get(), tmp2.get(), result);
return;
}
break;
case OP_XOR: {
expr_ref tmp1(m_manager), tmp2(m_manager);
reduce_rec(a->get_arg(0), tmp1);
@ -580,7 +582,7 @@ void expr_strong_context_simplifier::simplify_model_based(expr* fml, expr_ref& r
}
assignment_map.insert(a, value);
}
else if (m.is_iff(a, n1, n2) || m.is_eq(a, n1, n2)) {
else if (m.is_eq(a, n1, n2)) {
lbool v1 = assignment_map.find(n1);
lbool v2 = assignment_map.find(n2);
if (v1 == l_undef || v2 == l_undef) {