using System;

using System.Runtime.CompilerServices;

using System.Buffers;

using System.Buffers.Binary;

​

class Program

{

    static byte[] FLOAT = new byte[sizeof(float)];

    static void Main()

    {

        int tmp = 0;

        for (int i = 0; i < 10_000_000; i++)

        {

            Unsafe.As<int, float>(ref tmp) = 123.456f;

            //Unsafe.As<byte, float>(ref FLOAT[0]) = 123.456f;

        }

        Console.WriteLine( Unsafe.As<int, float>(ref tmp) );

        Console.WriteLine( tmp );

​

        var buff = new byte[sizeof(int)];

        BinaryPrimitives.WriteInt32BigEndian(buff, tmp);

​

        Console.WriteLine( BinaryPrimitives.ReadInt32BigEndian(buff) );

        Console.WriteLine( BinaryPrimitives.ReadSingleBigEndian(buff) );

    }

}

​