配列に循環的にアクセスする方法3つの速度を調べてみた

using UnityEngine;

public class LengthSpeedTest : MonoBehaviour {

    int testCount = 1000000;
    const int ArrayLength = 1 << 2;
    readonly int mask = ArrayLength - 1;

    int idx = 0;
    int[] intArray = new int[ArrayLength];

    // Use this for initialization
    void Start () {
        idx = 0;
        Profiler.BeginSample("ClampPattern1");
        clamp1();
        Profiler.EndSample();

        idx = 0;
        Profiler.BeginSample("ClampPattern2");
        clamp2();
        Profiler.EndSample();

        idx = 0;
        Profiler.BeginSample("ClampPattern3");
        clamp3();
        Profiler.EndSample();

        UnityEditor.EditorApplication.isPlaying = false;
    }

    void clamp1()
    {
        for (int i = 0; i < testCount; i++)
        {
            if (++idx >= intArray.Length) idx = 0;
            intArray[idx] = 0;
        }
    }

    void clamp2()
    {
        for (int i = 0; i < testCount; i++)
        {
            intArray[++idx % ArrayLength] = 0;
        }
    }

    void clamp3()
    {
        for (int i = 0; i < testCount; i++)
        {
            intArray[++idx & mask] = 0;
        }
    }
}