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path enum filter calls to tag mutation 

Signed-off-by: James Cherry <cherry@parallaxsw.com>
This commit is contained in:
James Cherry 2025-04-24 10:47:03 -07:00
parent 60fadc2771
commit eb8d39a7dd
2 changed files with 64 additions and 11 deletions
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6
liberty/TimingArc.cc
View File

@ -309,9 +309,9 @@ TimingArcSet::arcsFrom(const RiseFall *from_rf,
TimingArc *&arc1,
TimingArc *&arc2) const
{
int tr_index = from_rf->index();
arc1 = from_arc1_[tr_index];
arc2 = from_arc2_[tr_index];
int rf_index = from_rf->index();
arc1 = from_arc1_[rf_index];
arc2 = from_arc2_[rf_index];
}
TimingArc *

69
search/PathEnum.cc
View File

@ -236,8 +236,7 @@ public:
Path *before_div,
bool unique_pins,
PathEnum *path_enum);
virtual VertexVisitor *copy() const;
virtual void visit(Vertex *) {} // Not used.
virtual VertexVisitor *copy() const override;
void visitFaninPathsThru(Path *before_div,
Vertex *prev_vertex,
TimingArc *prev_arc);
@ -255,7 +254,7 @@ public:
Tag *to_tag,
Arrival &to_arrival,
const MinMax *min_max,
const PathAnalysisPt *path_ap);
const PathAnalysisPt *path_ap) override;
private:
void makeDivertedPathEnd(Path *after_div,
@ -264,19 +263,28 @@ private:
// Return values.
PathEnd *&div_end,
Path *&after_div_copy);
bool visitEdge(const Pin *from_pin,
Vertex *from_vertex,
Edge *edge,
const Pin *to_pin,
Vertex *to_vertex) override;
virtual void visit(Vertex *) override {} // Not used.
void reportDiversion(const Edge *edge,
const TimingArc *div_arc,
Path *after_div);
PathEnd *path_end_;
Slack path_end_slack_;
Path *before_div_;
bool unique_pins_;
PathEnum *path_enum_;
Slack path_end_slack_;
Tag *before_div_tag_;
int before_div_rf_index_;
PathAPIndex before_div_ap_index_;
Arrival before_div_arrival_;
TimingArc *prev_arc_;
Vertex *prev_vertex_;
PathEnum *path_enum_;
bool crpr_active_;
VisitedFanins visited_fanins_;
};
@ -287,12 +295,15 @@ PathEnumFaninVisitor::PathEnumFaninVisitor(PathEnd *path_end,
PathEnum *path_enum) :
PathVisitor(path_enum),
path_end_(path_end),
path_end_slack_(path_end->slack(this)),
before_div_(before_div),
unique_pins_(unique_pins),
before_div_tag_(before_div_->tag(this)),
before_div_arrival_(before_div_->arrival()),
path_enum_(path_enum),
path_end_slack_(path_end->slack(this)),
before_div_tag_(before_div_->tag(this)),
before_div_rf_index_(before_div_tag_->rfIndex()),
before_div_ap_index_(before_div_tag_->pathAPIndex()),
before_div_arrival_(before_div_->arrival()),
crpr_active_(crprActive())
{
}
@ -305,12 +316,54 @@ PathEnumFaninVisitor::visitFaninPathsThru(Path *before_div,
before_div_ = before_div;
before_div_tag_ = before_div_->tag(this);
before_div_arrival_ = before_div_->arrival();
before_div_rf_index_ = before_div_tag_->rfIndex();
before_div_ap_index_ = before_div_tag_->pathAPIndex();
prev_arc_ = prev_arc;
prev_vertex_ = prev_vertex;
visited_fanins_.clear();
visitFaninPaths(before_div_->vertex(this));
}
// Specialize PathVisitor::visitEdge to filter paths/arcs to
// reduce tag mutations.
bool
PathEnumFaninVisitor::visitEdge(const Pin *from_pin,
Vertex *from_vertex,
Edge *edge,
const Pin *to_pin,
Vertex *to_vertex)
{
TagGroup *from_tag_group = search_->tagGroup(from_vertex);
if (from_tag_group) {
TimingArcSet *arc_set = edge->timingArcSet();
VertexPathIterator from_iter(from_vertex, search_);
while (from_iter.hasNext()) {
Path *from_path = from_iter.next();
PathAnalysisPt *path_ap = from_path->pathAnalysisPt(this);
if (path_ap->index() == before_div_ap_index_) {
const MinMax *min_max = path_ap->pathMinMax();
const RiseFall *from_rf = from_path->transition(this);
TimingArc *arc1, *arc2;
arc_set->arcsFrom(from_rf, arc1, arc2);
if (arc1 && arc1->toEdge()->asRiseFall()->index() == before_div_rf_index_) {
if (!visitArc(from_pin, from_vertex, from_rf, from_path,
edge, arc1, to_pin, to_vertex,
min_max, path_ap))
return false;
}
if (arc2 && arc2->toEdge()->asRiseFall()->index() == before_div_rf_index_) {
if (!visitArc(from_pin, from_vertex, from_rf, from_path,
edge, arc2, to_pin, to_vertex,
min_max, path_ap))
return false;
}
}
}
}
return true;
}
VertexVisitor *
PathEnumFaninVisitor::copy() const
{