Merge pull request #8635 from eder-matheus/grt_aps

grt: use all APs for non-core cells

Author: eder-matheus

src/grt/src/GlobalRouter.cpp

@@ -934,8 +934,14 @@ bool GlobalRouter::findPinAccessPointPositions(
       access_points.insert(
           access_points.begin(), bpin_pas.begin(), bpin_pas.end());
     }
-  } else {
+  } else if (pin.isCorePin()) {
     access_points = pin.getITerm()->getPrefAccessPoints();
+  } else {
+    // For non-core cells, DRT does not assign preferred APs.
+    // Use all APs to ensure the guides covering at least one AP.
+    for (const auto& [pin, aps] : pin.getITerm()->getAccessPoints()) {
+      access_points.insert(access_points.end(), aps.begin(), aps.end());
+    }
   }
 
   if (access_points.empty()) {

src/grt/src/Pin.cpp

@@ -185,4 +185,15 @@ odb::Point Pin::getPositionNearInstEdge(const odb::Rect& pin_box,
   return pin_pos;
 }
 
+bool Pin::isCorePin() const
+{
+  if (iterm == nullptr) {
+    return false;
+  }
+
+  odb::dbInst* inst = iterm->getInst();
+  return inst->isCore();
+  ;
+}
+
 }  // namespace grt

src/grt/src/Pin.h

@@ -66,6 +66,7 @@ class Pin
   bool isDriver();
   odb::Point getPositionNearInstEdge(const odb::Rect& pin_box,
                                      const odb::Point& rect_middle) const;
+  bool isCorePin() const;
 
  private:
   void determineEdge(const odb::Rect& bounds,