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A small, but sometimes effective optimization of DRC check functions: if a feature is entirely covered (with interaction distance) by a box, it is enough to check against the box

This commit is contained in:
Matthias Koefferlein 2026-02-15 19:17:21 +01:00
parent 199cf1edfa
commit 3df88ae279
1 changed files with 34 additions and 6 deletions
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40
src/db/db/dbRegionLocalOperations.cc
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@ -232,6 +232,8 @@ check_local_operation_base<TS, TI>::compute_results (db::Layout *layout, db::Cel
bool take_all = edge_check.has_negative_edge_output () || intruders.empty ();
db::Box common_box;
bool subjects_are_fully_covered = false;
if (! take_all) {
db::Vector e (edge_check.distance (), edge_check.distance ());
@ -241,14 +243,24 @@ check_local_operation_base<TS, TI>::compute_results (db::Layout *layout, db::Cel
subject_box += db::box_convert<TS> () (**i);
}
if (edge_check.requires_different_layers ()) {
db::Box intruder_box;
common_box = subject_box.enlarged (e);
if (edge_check.requires_different_layers () && ! common_box.empty ()) {
subjects_are_fully_covered = false;
db::Box all_intruders_box;
for (auto i = intruders.begin (); i != intruders.end (); ++i) {
intruder_box += db::box_convert<TI> () (**i);
db::Box intruder_box = db::box_convert<TI> () (**i);
if (! subjects_are_fully_covered && (*i)->is_box () && common_box.inside (intruder_box)) {
subjects_are_fully_covered = true;
}
all_intruders_box += intruder_box.enlarged (e);
}
common_box = subject_box.enlarged (e) & intruder_box.enlarged (e);
} else {
common_box = subject_box.enlarged (e);
common_box &= all_intruders_box;
}
}
@ -306,6 +318,22 @@ check_local_operation_base<TS, TI>::compute_results (db::Layout *layout, db::Cel
// empty intruders
} else if (subjects_are_fully_covered) {
// optimization: can use a single box for the intruders
n = 1;
db::Point ul = common_box.upper_left ();
db::Point lr = common_box.lower_right ();
poly_check.enter (db::Edge (common_box.p1 (), ul), n);
poly_check.enter (db::Edge (ul, common_box.p2 ()), n);
poly_check.enter (db::Edge (common_box.p2 (), lr), n);
poly_check.enter (db::Edge (lr, common_box.p1 ()), n);
n += 2;
} else if (! m_other_is_merged && (intruders.size () > 1 || ! (*intruders.begin ())->is_box ())) {
// NOTE: this local merge is not necessarily giving the same results than a global merge before running