rsz: Use current slack in TNS endpoint repair

Use current endpoint slack when starting TNS endpoint repair now that borrowed-latch effective slack is no longer used.

Remove the unused original endpoint slack snapshot from RepairTargetCollector and update the TNS regression golden for the resulting iteration count.

Signed-off-by: Jaehyun Kim <jhkim@precisioninno.com>

Author: jhkim-pii

src/rsz/src/RepairTargetCollector.cc

@@ -2269,7 +2269,6 @@ void RepairTargetCollector::setToEndpoint(int index)
   current_endpoint_index_ = index;
   const auto& end_slack_pair = violating_endpoints_[current_endpoint_index_];
   current_endpoint_ = graph_->pinLoadVertex(end_slack_pair.first);
-  current_end_original_slack_ = end_slack_pair.second;
 }
 
 void RepairTargetCollector::setToStartpoint(int index)
@@ -2278,7 +2277,6 @@ void RepairTargetCollector::setToStartpoint(int index)
   const auto& start_slack_pair
       = violating_startpoints_[current_startpoint_index_];
   current_startpoint_ = graph_->pinLoadVertex(start_slack_pair.first);
-  // Note: For startpoints, we don't use current_end_original_slack_
 }
 
 void RepairTargetCollector::advanceToNextEndpoint()

src/rsz/src/RepairTargetCollector.hh

@@ -98,10 +98,6 @@ class RepairTargetCollector
   void setToEndpoint(int index);
   sta::Vertex* getCurrentEndpoint() const { return current_endpoint_; }
   sta::Slack getCurrentEndpointSlack() const;
-  sta::Slack getCurrentEndpointOriginalSlack() const
-  {
-    return current_end_original_slack_;
-  }
   int getCurrentEndpointIndex() const { return current_endpoint_index_; }
   int getMaxEndpointCount() const { return violating_endpoints_.size(); }
   int getCurrentPass() const;
@@ -344,7 +340,6 @@ class RepairTargetCollector
   // Current endpoint iteration state
   bool iteration_began_;
   sta::Vertex* current_endpoint_;
-  sta::Slack current_end_original_slack_;
   int current_endpoint_index_;
 
   // === Startpoint iteration state ==========================================

src/rsz/src/policy/SetupTnsPolicy.cc

@@ -129,8 +129,7 @@ void SetupTnsPolicy::repairSetupTns(const float setup_slack_margin,
     }
 
     const sta::Pin* endpoint_pin = endpoint->pin();
-    sta::Slack endpoint_slack
-        = target_collector_->getCurrentEndpointOriginalSlack();
+    sta::Slack endpoint_slack = target_collector_->getCurrentEndpointSlack();
     if (sta::fuzzyGreaterEqual(endpoint_slack, setup_slack_margin)) {
       continue;
     }

src/rsz/test/repair_setup_phase_tns.ok

@@ -49,7 +49,7 @@ Path Type: max
           | Buffers |  Gates  | Buffers  |  Gates | Swaps |          |          |            |            | Endpts | St/EnPt 
 ------------------------------------------------------------------------------------------------------------------------------
        0* |       0 |       0 |        0 |      0 |     0 |    +0.0% |   -0.333 |       -0.3 |       -0.4 |      4 | r2/D
-       3* |       0 |       1 |        0 |      0 |     0 |    +0.9% |   -0.268 |       -0.3 |       -0.3 |      4 | r2/D
+       1* |       0 |       1 |        0 |      0 |     0 |    +0.9% |   -0.268 |       -0.3 |       -0.3 |      4 | r2/D
     final |       0 |       1 |        0 |      0 |     0 |    +0.9% |   -0.268 |       -0.3 |       -0.3 |      1 | r2/D
 ------------------------------------------------------------------------------------------------------------------------------
 [INFO RSZ-0051] Resized 1 instances: 1 up, 0 up match, 0 down, 0 VT