bench_3.cs

  public class Bench92
    {
        public int[] _x = null;

        [GlobalSetup]
        public void Setup()
        {
            _x = new int[10000];
        }

        [Benchmark(Baseline = true)]
        [MethodImpl(MethodImplOptions.NoInlining)]
        [Arguments(0)]
        public int A(int z)
        {
            var x = _x;
            try { _ = 1; } catch { }
            for (int i = 0; i < x.Length; i++)
            {
                x[i] = i + z;
                z += x[i];
            }
            return z;
        }

        [Benchmark()]
        [MethodImpl(MethodImplOptions.NoInlining)]
        [Arguments(0)]
        public int B(int z)
        {
            var x = _x;
            try { _ = 1; } catch { }
            var y = x;
            var zz = z;
            for (int i = 0; i < y.Length; i++)
            {
                y[i] = i + zz;
                zz += y[i];
            }
            return zz;
        }
    }