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hoist co-factors eagerly without adding axioms

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2020-05-25 15:10:45 -07:00
parent e938ee33bb
commit a97bc65af4
6 changed files with 94 additions and 68 deletions
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7
src/ast/rewriter/seq_rewriter.cpp
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@ -2278,6 +2278,13 @@ expr_ref seq_rewriter::derivative(expr* elem, expr* r) {
result = array.mk_select(2, args);
result = kleene_predicate(result, seq_sort);
}
else if (m().is_ite(r, p, r1, r2)) {
dr1 = derivative(elem, r1);
dr2 = derivative(elem, r2);
if (dr1 && dr2) {
result = m().mk_ite(p, dr1, dr2);
}
}
return result;
}