https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120941
--- Comment #14 from H.J. Lu <hjl.tools at gmail dot com> --- (In reply to Filip Kastl from comment #11) > (In reply to H.J. Lu from comment #9) > > Created attachment 61803 [details] > > A patch > > > > Please try this. > > Tried applying this on top of r16-1644-gaba3b9d3a48a07. > With r16-1644-gaba3b9d3a48a07 ... 224s > With r16-1644-gaba3b9d3a48a07 and the patch ... 161s > (this is on the machine where I originally measured 24% slowdown) > > Looks like this patch gets us the original speed and even a bit more. Nice. > > (In reply to H.J. Lu from comment #10) > > (In reply to Filip Kastl from comment #8) > > > The same commit (r16-1644-gaba3b9d3a48a07) causes ~20% slowdown of 470lbm > > > from 2006 SPEC on Zen5 with -Ofast -march=native -flto -fprofile-use. > > > > > > https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.0=1283.240.0 > > > > Can you extra a small testcase to show the issue? > > I could try. But we already have a patch. So I think we don't have to > search for a smaller testcase. What do you think? It isn't needed.
