[Bug tree-optimization/54497] [4.8 Regression] Revision 190015 causes 22% degradation on 172.mgrid on PowerPC

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54497

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |rguenth at gcc dot gnu.org
   Target Milestone|---                         |4.8.0
            Summary|Revision 190015 causes 22%  |[4.8 Regression] Revision
                   |degradation on 172.mgrid on |190015 causes 22%
                   |PowerPC                     |degradation on 172.mgrid on
                   |                            |PowerPC

--- Comment #1 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-09-06 10:01:41 UTC ---
I suppose the loop is no longer predicted to execute enough times?