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added rewrite for itos

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This commit is contained in:
Nikolaj Bjorner 2021-03-04 10:47:47 -08:00
parent e398959732
commit 847724fb21
1 changed files with 14 additions and 0 deletions
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14
src/ast/rewriter/seq_rewriter.cpp
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@ -2201,6 +2201,20 @@ br_status seq_rewriter::mk_str_itos(expr* a, expr_ref& result) {
}
return BR_DONE;
}
// itos(stoi(s)) -> if s = '0' or .... or s = '9' then s else ""
// when |s| <= 1
expr* b = nullptr;
if (str().is_stoi(a, b) && max_length(b, r) && r <= 1) {
expr_ref_vector eqs(m());
for (unsigned i = 0; i < 10; ++i) {
zstring s('0' + i);
eqs.push_back(m().mk_eq(b, str().mk_string(s)));
}
result = m().mk_or(eqs);
result = m().mk_ite(result, b, str().mk_string(symbol("")));
return BR_REWRITE2;
}
return BR_FAILED;
}