https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87077
Richard Biener <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|WAITING |NEW --- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> --- basic-block vectorization doesn't handle reduction so it gets badly confused by it. loop vectorization just vectorizes the inner loop (if you disable unrolling of it).