http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53726
--- Comment #8 from rguenther at suse dot de <rguenther at suse dot de> 2012-06-20 13:30:21 UTC --- On Wed, 20 Jun 2012, hjl.tools at gmail dot com wrote: > 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. The one from openSUSE 12.1. Btw, this is with static linking, so I suppose IFUNC and friends does not apply(?)
