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parameter eval order

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Signed-off-by: Lev Nachmanson <levnach@hotmail.com>
This commit is contained in:
Lev Nachmanson 2025-10-07 10:14:02 -07:00
parent a41549eee6
commit 40b980079b
1 changed files with 4 additions and 1 deletions
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5
src/ast/rewriter/seq_rewriter.cpp
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@ -4082,7 +4082,10 @@ expr_ref seq_rewriter::mk_derivative_rec(expr* ele, expr* r) {
// tl = rest of reverse(r2) i.e. butlast of r2
//hd = str().mk_nth_i(r2, m_autil.mk_sub(str().mk_length(r2), one()));
hd = mk_seq_last(r2);
m_br.mk_and(m().mk_not(m().mk_eq(r2, str().mk_empty(seq_sort))), m().mk_eq(hd, ele), result);
// factor nested constructor calls to enforce deterministic argument evaluation order
auto a_non_empty = m().mk_not(m().mk_eq(r2, str().mk_empty(seq_sort)));
auto a_eq = m().mk_eq(hd, ele);
m_br.mk_and(a_non_empty, a_eq, result);
tl = re().mk_to_re(mk_seq_butlast(r2));
return re_and(result, re().mk_reverse(tl));
}