https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104122
--- Comment #3 from Martin Jambor <jamborm at gcc dot gnu.org> --- (In reply to Richard Biener from comment #2) > It's ISA, not tuning. You are of course correct, unfortunately I am too accustomed to using the wrong term. > I suppose -march=native -mtune=generic is still bad? I don't know, I'd have to manually check. > I wonder if you tried the obvious -mprefer-avx128? I hope that is equivalent to -mprefer-vector-width=128 If it is, -march=native -mtune=native -mprefer-vector-width=128 is even quite a bit slower than -march=native -mtune=native.
