https://gcc.gnu.org/bugzilla/show_bug.cgi?id=54400
--- Comment #8 from Marc Glisse <glisse at gcc dot gnu.org> --- (In reply to Richard Biener from comment #7) > (note avoiding hadd in the reduc pattern was intended). Indeed. Except with -Os, or if a processor with a fast hadd appears, vectorising this doesn't bring anything. It doesn't hurt either though.
