http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57571
--- Comment #5 from phoenix <yiyi8761 at gmail dot com> --- (In reply to Jakub Jelinek from comment #4) > Have you actually measured any slowdown, or you just think that rep movsd > must be 8 times faster than rep movsb? Yes, actually I first measured the Flash Read(which execute with memcpy()) speed has a sharp down, and then find the kernel memcpy() efficiency problem. After, I test memcpy() with other methods, further confirmed the reuslt.
