https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69274
--- Comment #13 from Richard Biener <rguenth at gcc dot gnu.org> --- It would be interesting to see whether FDO also shows the regression (I only have a non-march=native FDO tester and the non-march=native tester doesn't show the regression already). Because it might be that while we vectorize the loops we always end up executing scalar code only due to low loop trip counts. Well, I'll try to investigate in that direction next week.