From f8fc314a03ab14643ae36fe655309b2c82c64d0a Mon Sep 17 00:00:00 2001
From: James Cherry <cherry@parallaxsw.com>
Date: Wed, 4 Oct 2023 15:39:42 -0700
Subject: [PATCH] LibertyPort::clockTreePathDelays()

Signed-off-by: James Cherry <cherry@parallaxsw.com>
---
 include/sta/Liberty.hh |  1 +
 liberty/Liberty.cc     | 27 +++++++++++++++++++++++++++
 2 files changed, 28 insertions(+)

diff --git a/include/sta/Liberty.hh b/include/sta/Liberty.hh
index d1ede379..0924ebd9 100644
--- a/include/sta/Liberty.hh
+++ b/include/sta/Liberty.hh
@@ -794,6 +794,7 @@ public:
   DriverWaveform *driverWaveform(const RiseFall *rf) const;
   void setDriverWaveform(DriverWaveform *driver_waveform,
                          const RiseFall *rf);
+  RiseFallMinMax clockTreePathDelays();
 
   static bool equiv(const LibertyPort *port1,
 		    const LibertyPort *port2);
diff --git a/liberty/Liberty.cc b/liberty/Liberty.cc
index bf90baa1..aedcb5b6 100644
--- a/liberty/Liberty.cc
+++ b/liberty/Liberty.cc
@@ -2566,6 +2566,33 @@ LibertyPort::setDriverWaveform(DriverWaveform *driver_waveform,
   driver_waveform_[rf->index()] = driver_waveform;
 }
 
+RiseFallMinMax
+LibertyPort::clockTreePathDelays()
+{
+  RiseFallMinMax delays;
+  const TimingArcSetSeq &arc_sets = liberty_cell_->timingArcSets(nullptr, this);
+  for (TimingArcSet *arc_set : arc_sets) {
+    TimingRole *role = arc_set->role();
+    if (role == TimingRole::clockTreePathMin()
+        || role == TimingRole::clockTreePathMax()) {
+      for (TimingArc *arc : arc_set->arcs()) {
+        TimingModel *model = arc->model();
+        GateTimingModel *gate_model = dynamic_cast<GateTimingModel*>(model);
+        ArcDelay delay;
+        Slew slew;
+        gate_model->gateDelay(liberty_cell_, nullptr, 0.0, 0.0, 0.0, false,
+                              delay, slew);
+        const RiseFall *rf = arc->toEdge()->asRiseFall();
+        const MinMax *min_max = (role == TimingRole::clockTreePathMin())
+          ? MinMax::min()
+          : MinMax::max();
+        delays.setValue(rf, min_max, delay);
+      }
+    }
+  }
+  return delays;
+}
+
 ////////////////////////////////////////////////////////////////
 
 LibertyPortSeq