[Bug tree-optimization/62220] missed optimization wrt module for loop variable

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62220

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |missed-optimization
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2014-08-26
                 CC|                            |grosser at gcc dot gnu.org
     Ever confirmed|0                           |1

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Note that as the suggested transform is quite complicated (splitting the loop
and completely changing iteration order) this is applicable for GRAPHITE
and thus polly?

Otherwise for more "simple" cases there is handling stuff similar to
strength-reduction or to the
tree-ssa-loop-im.c:rewrite_reciprocal/rewrite_bittest
cases.