[Bug tree-optimization/17790] New: Significant compile time increases for sixtrack with tree LICM and IV optimization

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

For datem.f from sixtrack, i get

loop invariant motion :  23.03 (17%) usr   0.05 ( 7%) sys  23.82 (16%) wall
loop iv optimization : 21.03 (15%) usr 0.05 (7%) sys 22.13 (16%) walll

On struct-aliasing, which has vuse bypassing enabled (and thus enables more
optimization), the situation is worse:

 loop invariant motion :  23.13 (17%) usr   0.04 (6%) sys  23.94 (15%) wall
 tree iv optimization  :  68.67 (49%) usr   0.29 (40%) sys  74.50 (50%) wall

For maincr.f, we have:

 tree iv optimization  :   9.72 (23%) usr   0.06 (13%) sys  10.10 (23%) wall

-- 
           Summary: Significant compile time increases for sixtrack with
                    tree LICM and IV optimization
           Product: gcc
           Version: 4.0.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: tree-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: dberlin at gcc dot gnu dot org
                CC: gcc-bugs at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17790