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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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11
src/ast/rewriter/der.cpp
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@ -40,11 +40,8 @@ static bool is_neg_var(ast_manager & m, expr * e, unsigned num_decls) {
*/
bool der::is_var_diseq(expr * e, unsigned num_decls, var * & v, expr_ref & t) {
// (not (= VAR t)) and (not (iff VAR t)) cases
if (m_manager.is_not(e) && (m_manager.is_eq(to_app(e)->get_arg(0)) || m_manager.is_iff(to_app(e)->get_arg(0)))) {
app * eq = to_app(to_app(e)->get_arg(0));
SASSERT(m_manager.is_eq(eq) || m_manager.is_iff(eq));
expr * lhs = eq->get_arg(0);
expr * rhs = eq->get_arg(1);
expr *eq, * lhs, *rhs;
if (m_manager.is_not(e, eq) && m_manager.is_eq(eq, lhs, rhs)) {
if (!is_var(lhs, num_decls) && !is_var(rhs, num_decls))
return false;
if (!is_var(lhs, num_decls))
@ -60,9 +57,7 @@ bool der::is_var_diseq(expr * e, unsigned num_decls, var * & v, expr_ref & t) {
return true;
}
// (iff VAR t) and (iff (not VAR) t) cases
else if (m_manager.is_iff(e)) {
expr * lhs = to_app(e)->get_arg(0);
expr * rhs = to_app(e)->get_arg(1);
else if (m_manager.is_eq(e, lhs, rhs) && m_manager.is_bool(lhs)) {
// (iff VAR t) case
if (is_var(lhs, num_decls) || is_var(rhs, num_decls)) {
if (!is_var(lhs, num_decls))