[Bug tree-optimization/18048] New: mgrid loop performance regression with ivopts

["dje at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

172.mgrid performance degraded after ivopts were introduced.  The patch to 
improve iv selection did not improve the performance.  This is separate from 
the register pressure problems.  The tree loop optimization appears to be 
leaving unnecessary computations in loops.

-- 
           Summary: mgrid loop performance regression with ivopts
           Product: gcc
           Version: 4.0.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: tree-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: dje at gcc dot gnu dot org
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: *-*-*
  GCC host triplet: *-*-*
GCC target triplet: *-*-*


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18048