[Bug tree-optimization/21998] (cond ? result1 : result2) is vectorized, where equivalent if-syntax isn't (store)

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21998

--- Comment #5 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-07-13 11:28:45 UTC ---
We have two related flags here, -ftree-loop-if-convert-stores, and
--param allow-store-data-races.  We can adjust the former to honor the
latter if specified and then eventually vectorize this, too.