improve 2

pkg/nip/rule.go

@@ -572,28 +572,49 @@ func (r Rule) ValidateStats() error {
 }
 
 func evaluateClassSkillsSum(it data.Item) int {
-	// Check all class skills stats
-	totalClassSkills := 0
-
-	for layer := 0; layer <= maxClassSkillsLayer; layer++ {
-		if itemStat, found := it.FindStat(stat.AddClassSkills, layer); found && itemStat.Value > 0 {
-			totalClassSkills += itemStat.Value
-		}
+	return evaluatePositiveStatSum(it, stat.AddClassSkills, maxClassSkillsLayer)
 }
 
-	return totalClassSkills
-}
 func evaluateSkillTabSum(it data.Item) int {
-	// Check all skill tab stats
-	totalSkillTabs := 0
-
-	for layer := 0; layer <= maxSkillTabLayer; layer++ {
-		if itemStat, found := it.FindStat(stat.AddSkillTab, layer); found && itemStat.Value > 0 {
-			totalSkillTabs += itemStat.Value
-		}
+	return evaluatePositiveStatSum(it, stat.AddSkillTab, maxSkillTabLayer)
 }
 
-	return totalSkillTabs
+const aggregateLayerFastPathLimit = 64
+
+func evaluatePositiveStatSum(it data.Item, statID stat.ID, maxLayer int) int {
+	// Current aggregate aliases fit in a small stack bitmap; retain the general
+	// lookup path if additional layers later exceed that bound.
+	if maxLayer >= aggregateLayerFastPathLimit {
+		total := 0
+		for layer := 0; layer <= maxLayer; layer++ {
+			if itemStat, found := it.FindStat(statID, layer); found && itemStat.Value > 0 {
+				total += itemStat.Value
+			}
+		}
+		return total
+	}
+
+	var foundLayers [aggregateLayerFastPathLimit]bool
+	total := 0
+	for _, itemStat := range it.Stats {
+		if itemStat.ID != statID || itemStat.Layer < 0 || itemStat.Layer > maxLayer || foundLayers[itemStat.Layer] {
+			continue
+		}
+		foundLayers[itemStat.Layer] = true
+		if itemStat.Value > 0 {
+			total += itemStat.Value
+		}
+	}
+	for _, itemStat := range it.BaseStats {
+		if itemStat.ID != statID || itemStat.Layer < 0 || itemStat.Layer > maxLayer || foundLayers[itemStat.Layer] {
+			continue
+		}
+		foundLayers[itemStat.Layer] = true
+		if itemStat.Value > 0 {
+			total += itemStat.Value
+		}
+	}
+	return total
 }
 
 func maxAliasLayer(statID stat.ID) int {