[Bug tree-optimization/66430] IPA CP alignment information is not used for expression simplification

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66430

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2015-06-08
                 CC|                            |rguenth at gcc dot gnu.org
          Component|ipa                         |tree-optimization
     Ever confirmed|0                           |1

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Hmm.

Visiting statement:
_4 = _3 & 7;
which is likely CONSTANT
Lattice value changed to CONSTANT 0x0 (0x5).  Adding SSA edges to worklist.
marking stmt to be not simulated again

so you expect it to be optimized to 5 but CCP does not propagate known
misalignment.