[Bug tree-optimization/80558] VRP not handling x & -2 well

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80558

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |missed-optimization
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2017-05-02
     Ever confirmed|0                           |1

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
bitop handling for range propagation is quite poor -- we've added some
special-cases but yes, a few more wouldn't hurt.  We generally miss a
bit-lattice somewhere on-the-side...