[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 #9 from Richard Biener <rguenth at gcc dot gnu.org> ---
Created attachment 32183
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=32183&action=edit
patch

Patch I am testing.