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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2026-06-11 14:10:25 -07:00
parent e21d154778
commit cf0e43ab38
1 changed files with 8 additions and 5 deletions
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13
src/ast/rewriter/seq_derive.cpp
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@ -85,7 +85,7 @@ namespace seq {
// Initialize path state for inline pruning
m_path.reset();
m_intervals.reset();
m_intervals.push_back(std::make_pair(0u, u().max_char()));
m_intervals.push_back({0u, u().max_char()});
m_intervals_start = 0;
m_path_expr = m.mk_true();
result = derive_rec(r);
@ -1052,6 +1052,7 @@ namespace seq {
if (c == cond)
return csign == sign ? l_true : l_false;
expr* lhs1 = nullptr, * rhs1 = nullptr, * lhs2 = nullptr, * rhs2 = nullptr;
// x = v, v != w |-> x != w
if (!csign && m.is_eq(cond, lhs1, rhs1) && m.is_eq(c, lhs2, rhs2)) {
if (m.is_value(lhs1)) std::swap(lhs1, rhs1);
if (m.is_value(lhs2)) std::swap(lhs2, rhs2);
@ -1254,10 +1255,12 @@ namespace seq {
unsigned j = m_intervals_start;
for (unsigned i = m_intervals_start; i < m_intervals.size(); ++i) {
auto [lo1, hi1] = m_intervals[i];
if (hi < lo1)
if (hi < lo1 || lo > hi1) {
j = old_sz;
break;
}
if (hi1 >= lo)
m_intervals[j++] = std::make_pair(std::max(lo1, lo), std::min(hi1, hi));
m_intervals[j++] = {std::max(lo1, lo), std::min(hi1, hi)};
}
m_intervals.shrink(j);
}
@ -1278,9 +1281,9 @@ namespace seq {
m_intervals.push_back(m_intervals[i]);
} else {
if (ilo < lo)
m_intervals.push_back(std::make_pair(ilo, lo - 1));
m_intervals.push_back({ilo, lo - 1});
if (ihi > hi)
m_intervals.push_back(std::make_pair(hi + 1, ihi));
m_intervals.push_back({hi + 1, ihi});
}
}
m_intervals_start = old_sz;