[Bug tree-optimization/48172] [4.5/4.6/4.7 Regression] incorrect vectorization of loop in GCC 4.5.* with -O3

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48172

--- Comment #8 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-05-12 
10:40:02 UTC ---
Created attachment 24236
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=24236
patch

Patch I'm going to test.