Reduce vias with multiobjective hypergraph routing

lib/MinHeap.ts

@@ -16,6 +16,20 @@ export class MinHeap<T> {
     this.items.length = 0
   }
 
+  removeWhere(predicate: (item: T) => boolean): void {
+    let writeIndex = 0
+    for (const item of this.items) {
+      if (predicate(item)) continue
+      this.items[writeIndex] = item
+      writeIndex += 1
+    }
+    this.items.length = writeIndex
+
+    for (let index = (this.items.length >> 1) - 1; index >= 0; index--) {
+      this.siftDown(index)
+    }
+  }
+
   queue(item: T) {
     this.items.push(item)
     this.siftUp(this.items.length - 1)

lib/compat/convertToSerializedHyperGraph.ts

@@ -184,8 +184,8 @@ const getOrderedRoutePath = (
     throw new Error(`Route ${routeId} has no solved segments`)
   }
 
-  const startPortId = solver.problem.routeStartPort[routeId]
-  const endPortId = solver.problem.routeEndPort[routeId]
+  const startPortId = solver.state.solvedRouteStartPort[routeId]
+  const endPortId = solver.state.solvedRouteEndPort[routeId]
   const segmentsByPort = new Map<
     PortId,
     Array<RouteSegment & { segmentIndex: number }>

lib/compat/loadSerializedHyperGraph.ts

@@ -624,6 +624,8 @@ export const loadSerializedHyperGraph = (
   const solution: TinyHyperGraphSolution = {
     solvedRoutePathSegments,
     solvedRoutePathRegionIds,
+    solvedRouteStartPort: new Int32Array(routeStartPort),
+    solvedRouteEndPort: new Int32Array(routeEndPort),
   }
 
   return { topology, problem, solution }

lib/computeRegionCost.ts

@@ -7,6 +7,15 @@ export const isKnownSingleLayerMask = (regionAvailableZMask: number) =>
   regionAvailableZMask > 0 &&
   (regionAvailableZMask & (regionAvailableZMask - 1)) === 0
 
+export const computeEstimatedViaCount = (
+  numSameLayerIntersections: number,
+  numCrossLayerIntersections: number,
+  numEntryExitChanges: number,
+) =>
+  numSameLayerIntersections * 2 +
+  numCrossLayerIntersections +
+  numEntryExitChanges
+
 export const computeRegionCost = (
   regionWidth: number,
   regionHeight: number,
@@ -39,10 +48,11 @@ export const computeRegionCostForArea = (
   regionAvailableZMask = 0,
   minViaPadDiameter = DEFAULT_MIN_VIA_PAD_DIAMETER,
 ) => {
-  const estViasRequired =
-    numSameLayerIntersections * 2 +
-    numCrossLayerIntersections * 1 +
-    numEntryExitChanges * 1
+  const estViasRequired = computeEstimatedViaCount(
+    numSameLayerIntersections,
+    numCrossLayerIntersections,
+    numEntryExitChanges,
+  )
   const viaSizeWithMargin = minViaPadDiameter + TRACE_VIA_MARGIN
   const viaSizeWithMarginSq = viaSizeWithMargin ** 2