dotnet 对指针转换为结构体多个不同方法的性能分析

using BenchmarkDotNet.Attributes;
using BenchmarkDotNet.Running;
using System;
using System.Runtime.InteropServices;

[MemoryDiagnoser]
public class Program
{
    public static void Main(string[] args) => BenchmarkSwitcher.FromAssembly(typeof(Program).Assembly).Run(args);

    private IntPtr _ptr;

    [GlobalSetup]
    public unsafe void Setup() => _ptr = Marshal.AllocHGlobal(sizeof(MyPoint));

    [GlobalCleanup]
    public void Cleanup() => Marshal.FreeHGlobal(_ptr);

    [Benchmark]
    public unsafe MyPoint Cast() => *(MyPoint*)_ptr; // 0.0477ns

    [Benchmark]
    public MyPoint PtrToStructureGeneric() => Marshal.PtrToStructure<MyPoint>(_ptr); // 26.2864ns

    [Benchmark]
    public MyPoint PtrToStructureNonGeneric() => (MyPoint)Marshal.PtrToStructure(_ptr, typeof(MyPoint)); // 28.2225ns
}

[StructLayout(LayoutKind.Sequential)]
public struct MyPoint
{
    public int X;
    public int Y;
}

        public static object? PtrToStructure(IntPtr ptr, Type structureType)
        {
            // Ignore some code ...
            object structure = Activator.CreateInstance(structureType, nonPublic: true)!;
            PtrToStructureHelper(ptr, structure, allowValueClasses: true);
            return structure;
        }

        public static T? PtrToStructure<T>(IntPtr ptr)
        {
            // Ignore some code ...
            object structure = Activator.CreateInstance(structureType, nonPublic: true)!;
            PtrToStructureHelper(ptr, structure, allowValueClasses: true);
            return (T)structure;
        }