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update Bool rewriter to pull negations up

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Nikolaj Bjorner 2021-08-25 17:50:49 -07:00
parent e6264a80ff
commit 2daf569da6
1 changed files with 10 additions and 1 deletions
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11
src/ast/rewriter/bool_rewriter.cpp
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@ -721,9 +721,18 @@ br_status bool_rewriter::mk_eq_core(expr * lhs, expr * rhs, expr_ref & result) {
result = m().mk_false(); result = m().mk_false();
return BR_DONE; return BR_DONE;
} }
if (m().is_not(rhs))
std::swap(lhs, rhs);
if (m().is_not(lhs, lhs)) {
result = m().mk_not(m().mk_eq(lhs, rhs));
return BR_REWRITE2;
}
if (unfolded) { if (unfolded) {
result = mk_eq(lhs, rhs); result = mk_eq(lhs, rhs);
return BR_DONE; return BR_REWRITE1;
} }
expr *la, *lb, *ra, *rb; expr *la, *lb, *ra, *rb;