这个C代码做什么[Duff的设备]？ [英] What does this C code do [Duff's device]?

问题描述

void Send(int * to, const int* from, const int count)
{
    int n = (count+7) / 8;
    switch(count%8)
    {
       case 0: do { *to++ = *from++;
       case 7:      *to++ = *from++;
       case 6:      *to++ = *from++;
       case 5:      *to++ = *from++;
       case 4:      *to++ = *from++;
       case 3:      *to++ = *from++;
       case 2:      *to++ = *from++;
       case 1:      *to++ = *from++;
        } while (--n>0);
    }
}

推荐答案

是用于复制内存缓冲区的 Duff设备。

This is Duff's Device for copying memory buffers.

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