https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83017
--- Comment #11 from rguenther at suse dot de <rguenther at suse dot de> --- On November 16, 2017 5:42:02 PM GMT+01:00, "dominiq at lps dot ens.fr" <gcc-bugzi...@gcc.gnu.org> wrote: >https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83017 > >--- Comment #10 from Dominique d'Humieres <dominiq at lps dot ens.fr> >--- >> Created attachment 42621 [details] >> updated patch > >AFAICT the patch does not fix the problem: > >without the patch > > PI 2.98876095 > PI 3.14159274 >4.742u 0.015s 0:04.77 99.5% 0+0k 0+0io 36pf+0w > >with the patch > > PI 2.98876095 > PI 3.14159274 >4.782u 0.012s 0:04.80 99.7% 0+0k 0+0io 0pf+0w Please use - fopt-info-loop to verify the loop is parallelized. You have to use - floop-parallelize-all as well due to the cost model issue. It might be we employ the same cost model at runtime.
