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fix #7446, by adding rewrite simplification

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2024-11-11 19:16:11 -08:00
parent 1cc808c58d
commit c0e748a51a
1 changed files with 4 additions and 0 deletions
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4
src/ast/rewriter/seq_rewriter.cpp
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@ -2471,6 +2471,10 @@ br_status seq_rewriter::mk_str_lt(expr* a, expr* b, expr_ref& result) {
result = m().mk_false(); result = m().mk_false();
return BR_DONE; return BR_DONE;
} }
if (str().is_empty(a)) {
result = m().mk_not(m().mk_eq(a, b));
return BR_DONE;
}
if (str().is_string(a, as) && str().is_string(b, bs)) { if (str().is_string(a, as) && str().is_string(b, bs)) {
unsigned sz = std::min(as.length(), bs.length()); unsigned sz = std::min(as.length(), bs.length());
for (unsigned i = 0; i < sz; ++i) { for (unsigned i = 0; i < sz; ++i) {