[Bug tree-optimization/60276] [4.7/4.8/4.9 Regression] -O3 autovectorizer breaks on a particular loop

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60276

--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
But you can clearly see that this isn't valid vectorization because of the
read-after-write dependence of out[x].