http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48765
--- Comment #3 from Ira Rosen <irar at il dot ibm.com> 2011-04-27 10:25:16 UTC --- As analyzed by Richard, the problem (btw, unrelated to Richard's patch) is that the vectorization factor is changed after the analysis for this loop, and the same checks that worked fine during the analysis, now fail during the transformation. I'll try to move the vectorization factor calculation before the statements analysis to avoid this. Ira