fast array copy

static unsafe void CustomCopy(void * dest, void* src, int count)
{
    int block;

    block = count >> 3;

    long* pDest = (long*)dest;
    long* pSrc = (long*)src;

    for (int i = 0; i < block; i++)
    {
        *pDest = *pSrc; pDest++; pSrc++;
    }
    dest = pDest;
    src = pSrc;
    count = count - (block << 3);

    if (count > 0)
    {
        byte* pDestB = (byte*) dest;
        byte* pSrcB = (byte*) src;
        for (int i = 0; i < count; i++)
        {
            *pDestB = *pSrcB; pDestB++; pSrcB++;
        }
    }
}