[Bug target/57571] linux kernel function memcpy() execute with low efficiency on Intel Ivybridge platform

[yiyi8761 at gmail dot com]

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.