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param eval

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Lev Nachmanson 2025-10-07 09:04:24 -07:00 • committed by Nikolaj Bjorner
parent e113d39aa8
commit b22f4d8802
1 changed files with 26 additions and 8 deletions
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34
src/ast/rewriter/seq_rewriter.cpp
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@ -1384,9 +1384,16 @@ br_status seq_rewriter::mk_seq_nth(expr* a, expr* b, expr_ref& result) {
}
expr* la = str().mk_length(a);
result = m().mk_ite(m().mk_and(m_autil.mk_ge(b, zero()), m().mk_not(m_autil.mk_le(la, b))),
str().mk_nth_i(a, b),
str().mk_nth_u(a, b));
{
// deterministic evaluation order for guard components
auto ge0 = m_autil.mk_ge(b, zero());
auto le_la = m_autil.mk_le(la, b);
auto not_le = m().mk_not(le_la);
auto guard = m().mk_and(ge0, not_le);
auto t1 = str().mk_nth_i(a, b);
auto e1 = str().mk_nth_u(a, b);
result = m().mk_ite(guard, t1, e1);
}
return BR_REWRITE_FULL;
}
@ -2716,7 +2723,10 @@ br_status seq_rewriter::mk_re_reverse(expr* r, expr_ref& result) {
zstring zs;
unsigned lo = 0, hi = 0;
if (re().is_concat(r, r1, r2)) {
result = re().mk_concat(re().mk_reverse(r2), re().mk_reverse(r1));
// deterministic evaluation order for reverse operands
auto a_rev = re().mk_reverse(r2);
auto b_rev = re().mk_reverse(r1);
result = re().mk_concat(a_rev, b_rev);
return BR_REWRITE2;
}
else if (re().is_star(r, r1)) {
@ -2787,8 +2797,9 @@ br_status seq_rewriter::mk_re_reverse(expr* r, expr_ref& result) {
return BR_DONE;
}
else if (re().is_to_re(r, s) && str().is_concat(s, s1, s2)) {
result = re().mk_concat(re().mk_reverse(re().mk_to_re(s2)),
re().mk_reverse(re().mk_to_re(s1)));
auto a_rev = re().mk_reverse(re().mk_to_re(s2));
auto b_rev = re().mk_reverse(re().mk_to_re(s1));
result = re().mk_concat(a_rev, b_rev);
return BR_REWRITE3;
}
else {
@ -3022,8 +3033,15 @@ void seq_rewriter::mk_antimirov_deriv_rec(expr* e, expr* r, expr* path, expr_ref
result = mk_antimirov_deriv_union(c1, re().mk_ite_simplify(r1nullable, mk_antimirov_deriv(e, r2, path), nothing()));
}
else if (m().is_ite(r, c, r1, r2)) {
c1 = simplify_path(e, m().mk_and(c, path));
c2 = simplify_path(e, m().mk_and(m().mk_not(c), path));
{
auto cp = m().mk_and(c, path);
c1 = simplify_path(e, cp);
}
{
auto notc = m().mk_not(c);
auto np = m().mk_and(notc, path);
c2 = simplify_path(e, np);
}
if (m().is_false(c1))
result = mk_antimirov_deriv(e, r2, c2);
else if (m().is_false(c2))