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

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57571

--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Anyway, please see http://gcc.gnu.org/bugs.html, without preprocessed source
and gcc options passed to it this report is useless.
Also, if it is a memcpy into a hardware device area, perhaps the kernel
shouldn't use memcpy for that but some routine optimized for device memory
access, the compiler isn't told in any way that it isn't normal memory and all
it can do is choose best memcpy strategy for host memory to memory copies.