[Bug tree-optimization/15784] fold misses binary optimization

[pinskia at gcc dot gnu dot org]

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |4.1.0
            Version|4.1.0                       |4.0.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15784