On Mon, Jan 07, 2019 at 09:29:09AM +0100, Richard Biener wrote: > On Sun, 6 Jan 2019, Jan Hubicka wrote: > > Even though it is late in release cycle I wonder if we can do that for > > GCC 9? Performance of vectorization is very architecture specific, I > > would propose enabling vectorization for Zen, core based chips and > > generic in x86-64. I can also run benchmarks on buldozer. I can then > > tune down the cheap model to avoid some of more expensive > > transformations. > > I'd rather not do this now, it's _way_ too late (also considering > you are again doing inliner tuning so late).
This probably should be more generic than just x86 really, we have similar problems on Power (-O3 is almost always faster than -O2, which is bad). Likely other archs have the same problems. But yes, too late for GCC 9. Segher
