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misc edits of work in progress

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This commit is contained in:
Margus Veanes 2026-06-15 23:00:25 -06:00
parent bcdbc80ab8
commit 61ba424ae6
10 changed files with 507 additions and 13 deletions
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15
src/ast/rewriter/seq_derive.cpp
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@ -1252,21 +1252,18 @@ namespace seq {
// Intersect the active suffix m_intervals[m_intervals_start..end] with [lo, hi]
void derive::intersect_intervals(unsigned lo, unsigned hi) {
// Copy active suffix to end, update start, then filter
unsigned old_start = m_intervals_start;
unsigned old_sz = m_intervals.size();
for (unsigned i = old_start; i < old_sz; ++i)
for (unsigned i = m_intervals_start; i < old_sz; ++i)
m_intervals.push_back(m_intervals[i]);
m_intervals_start = old_sz;
// Filter in-place within new suffix
// Filter in-place within new suffix: drop intervals disjoint from [lo,hi],
// keep the intersection for overlapping ones.
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 || lo > hi1) {
j = old_sz;
break;
}
if (hi1 >= lo)
m_intervals[j++] = {std::max(lo1, lo), std::min(hi1, hi)};
if (hi < lo1 || lo > hi1)
continue; // disjoint with this interval — drop it
m_intervals[j++] = {std::max(lo1, lo), std::min(hi1, hi)};
}
m_intervals.shrink(j);
}