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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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5
src/ast/rewriter/bool_rewriter.cpp
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@ -39,7 +39,6 @@ br_status bool_rewriter::mk_app_core(func_decl * f, unsigned num_args, expr * co
SASSERT(f->get_family_id() == m().get_basic_family_id());
switch (f->get_decl_kind()) {
case OP_EQ:
case OP_IFF:
SASSERT(num_args == 2);
return mk_eq_core(args[0], args[1], result);
case OP_DISTINCT:
@ -428,7 +427,7 @@ bool bool_rewriter::simp_nested_eq_ite(expr * t, expr_fast_mark1 & neg_lits, exp
neg = true;
t = to_app(t)->get_arg(0);
}
if (m().is_iff(t) || m().is_eq(t)) {
if (m().is_eq(t)) {
bool modified = false;
expr * new_lhs = simp_arg(to_app(t)->get_arg(0), neg_lits, pos_lits, modified);
expr * new_rhs = simp_arg(to_app(t)->get_arg(1), neg_lits, pos_lits, modified);
@ -708,7 +707,7 @@ br_status bool_rewriter::mk_eq_core(expr * lhs, expr * rhs, expr_ref & result) {
expr *la, *lb, *ra, *rb;
// fold (iff (iff a b) (iff (not a) b)) to false
if (m().is_iff(lhs, la, lb) && m().is_iff(rhs, ra, rb)) {
if (m().is_eq(lhs, la, lb) && m().is_eq(rhs, ra, rb)) {
expr *n;
if ((la == ra && ((m().is_not(rb, n) && n == lb) ||
(m().is_not(lb, n) && n == rb))) ||