> On Oct 15, 2013, at 6:58 AM, Igor Zamyatin <izamya...@gmail.com> wrote:
> > Hi All! > > Is there any particular reason that matmul* modules from libgfortran > are compiled with -O2 -ftree-vectorize? > > I see some regressions on Atom processor after r202980 > (http://gcc.gnu.org/ml/gcc-cvs/2013-09/msg00846.html) > > Why not just use O3 for those modules? -O3 and -O2 -ftree-vectorize won't give much performance difference. What you are seeing is the cost model needs improvement; at least for atom. > > > Thanks, > Igor
