http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53726
--- Comment #7 from H.J. Lu <hjl.tools at gmail dot com> 2012-06-20 12:46:57 UTC --- (In reply to comment #6) > Btw, I cannot reproduce the slowdown on 64bit and the 32bit memcpy in glibc Which glibc are you using? > simply does a rep movsb; for any size lower than 20 bytes ... but as I have > been told rep movsb; setup cost is prohibitively high on most Intel CPUs ... > I didn't see rep movsb in 32-bit memcpy in glibc 2.14.
