在C#中，将ulong [64]转换为byte [512]更快吗? [英] In C#, convert ulong[64] to byte[512] faster?

问题描述

我有一种方法可以在for语句中使用二进制移位将ulongs转换为字节，但效率不高.有没有办法将大小为64的ulong数组直接转换为大小为512的字节数组?这是一段可运行数千次的代码，我需要保存每一毫秒，以便依次保存几秒钟.

I have a way that converts ulongs to bytes using binary shifts in a for statement but it's not very time efficient. Is there a way to cast a ulong array of size 64 directly into a byte array of size 512? This is a section of code that runs thousands of times and I need to save every millisecond so I can in turn save seconds.

现在这就是我正在做的:

Right now this is what I'm doing:

                for (int k = 0; k < ulongs.Length; k++) {
                    bytes[(k << 3)] = (byte)(ulongs[k] >> 56);
                    bytes[(k << 3) + 1] = (byte)(ulongs[k] >> 48);
                    bytes[(k << 3) + 2] = (byte)(ulongs[k] >> 40);
                    bytes[(k << 3) + 3] = (byte)(ulongs[k] >> 32);
                    bytes[(k << 3) + 4] = (byte)(ulongs[k] >> 24);
                    bytes[(k << 3) + 5] = (byte)(ulongs[k] >> 16);
                    bytes[(k << 3) + 6] = (byte)(ulongs[k] >> 8);
                    bytes[(k << 3) + 7] = (byte)(ulongs[k]);
                }

推荐答案

unsafe 
{
    fixed (ulong* src = ulongs) 
    {
        Marshal.Copy(new IntPtr((void*)src), bytes, 0, 512);
    }
}

这似乎有效.我不确定是否需要修复，但是我在定时测试中损失了整整一秒钟.

This seems to work. I'm not sure if fixed is required, but I lost an entire second during timed tests.

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