add benchmark from godotengine/godot#70838

test/benchmark.gd

@@ -16,9 +16,44 @@ func _init() -> void:
 	info("string")
 	start_ms = Time.get_ticks_msec()
 	check(start_ms, string(), 300000)
+	info("pr")
+	start_ms = Time.get_ticks_msec()
+	check(start_ms, pr(), 6553600)
+	self.quit()
+	info("pr_typed")
+	start_ms = Time.get_ticks_msec()
+	check(start_ms, pr_typed(), 6553600)
 	self.quit()
 	return
 
+func pr() -> int:
+	const elems = 6553600
+	var arr = []
+	for x in range(elems):
+		arr.append(randi() % elems)
+	var acc = 0.0
+	for e in arr:
+		var e2 = arr[e]
+		var e3 = arr[e2]
+		acc += e * e2
+		acc *= e3 + e
+		acc = sqrt(acc)
+	return arr.size()
+
+func pr_typed() -> int:
+	const elems: int = 6553600
+	var arr: PackedInt32Array = []
+	for x in range(elems):
+		arr.append(randi() % elems)
+	var acc : float = 0.0
+	for e in arr:
+		var e2 :int = arr[e]
+		var e3 :int = arr[e2]
+		acc += e * e2
+		acc *= e3 + e
+		acc = sqrt(acc)
+	return arr.size()
+
 func arr() -> int:
 	var array: Array = []
 	while array.size() < 1500: