http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49093
--- Comment #6 from rguenther at suse dot de <rguenther at suse dot de> 2011-05-31 08:43:39 UTC --- On Tue, 31 May 2011, irar at il dot ibm.com wrote: > http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49093 > > --- Comment #5 from Ira Rosen <irar at il dot ibm.com> 2011-05-31 08:30:49 > UTC --- > (In reply to comment #4) > > > I think that's reasonable for 4.6. But we don't need to make > > data-ref analysis fail just because of volatile references - we for > > example can easily unroll a loop with volatile loads/stores. > > > > Of course this case seems to be special - how do we deal with > > stmts with no uses during vectorization? Or do we assume > > they don't happen because usually DCE gets rid of them? > > We ignore them. But this is under the assumption that they don't have memory > accesses. Ah, I see. Yes, I guess not vectorizing for volatiles is the way to go then. Richard.
