最適化Ｔｉｐｓ配列の走査にlengthプロパティの使用を避ける。

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modified : 2009-01-29 12:21:34

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<?xml version="1.0" encoding="UTF-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" applicationComplete="appCompleteHandler(event)">
	<mx:Script>
	<![CDATA[
	import flash.events.MouseEvent;
	import mx.events.FlexEvent;
	import mx.controls.Alert;
	import flash.system.Capabilities;
	import flash.utils.getTimer;
	
	private const LENGTH:int = 1000000;
	private var vector:Vector.<Number>;
	public function appCompleteHandler(event:FlexEvent):void{
		if(Capabilities.isDebugger){
			var msg:String = "デバッグ版のプレーヤを使用しています。正しいベンチマークの結果を得るにはリリース版を使用することをお勧めします。";
			Alert.show(msg, "インフォメーション");
		}
		console.text += "OS : " + Capabilities.os + "\n";
		console.text += "Vesion : " + Capabilities.version + "\n";
		console.text += "Type : " + Capabilities.playerType + "\n";
		Capabilities.isDebugger ? console.text += "Debug version\n" : null;
	}
	public function clickHandler(event:MouseEvent):void{
		startBenchmark();
	}
	public function clear(event:MouseEvent):void {
		console.text = "";
	}
	public function startBenchmark():void{
		var i:int;
		var tmp:Number;
		
		vector = new Vector.<Number>(LENGTH);
		console.text += "start benchimarking\n";

var time:int = getTimer();
		for (i = 0; i < vector.length; i++) {
			vector[i] = i;
		}
		var dt:int
		dt = getTimer() - time;
		
		console.text += "プロパティと比較" + dt + "ms\n"; 
		
		time = getTimer();
		var len:int = vector.length;
		for(i = 0; i < len; i++){
			vector[i] = i;
		}
		dt = getTimer() - time;
		console.text += "ローカル変数と比較" + dt + "ms\n"; 
		
		time = getTimer();
		for(i = 0; i < LENGTH; i++){
			vector[i] = i;
		}
		dt = getTimer() - time;
		console.text += "定数と比較" + dt + "ms\n";

time = getTimer();
		
		for(i = vector.length - 1; i >= 0; i--){
			vector[i] = i;
		}
		dt = getTimer() - time;
		console.text += "０と比較" + dt + "ms\n"; 
		
		console.text += "\n"; 
	}

]]>
	</mx:Script>
	<mx:VBox width="100%" height="100%">
		<mx:TextArea id="console" width="100%" height="100%"></mx:TextArea>
		<mx:HBox width="100%">
			<mx:Button label="Start" click="clickHandler(event)" />
			<mx:Button label="Clear" click="clear(event)" />
		</mx:HBox>
	</mx:VBox>
</mx:Application>

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