[Bug tree-optimization/18419] New: [4.0 Regression] tree-ssa aliasing slow

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

The testcase from PR 16975 shows the tree-ssa aliasing pass can be slow.
You can get the testcase from:
<http://www.math.purdue.edu/~lucier/GNATS/GNATS-12/_num.i.gz>
Here is the results from my build (yes with --disable-checking):
 tree PTA              :  35.74 (38%) usr   0.12 ( 1%) sys  37.63 (33%) wall


Note this testcase has a large number of computed gotos.

-- 
           Summary: [4.0 Regression] tree-ssa aliasing slow
           Product: gcc
           Version: 4.0.0
            Status: UNCONFIRMED
          Keywords: compile-time-hog
          Severity: normal
          Priority: P2
         Component: tree-optimization
        AssignedTo: dnovillo at gcc dot gnu dot org
        ReportedBy: pinskia at gcc dot gnu dot org
                CC: gcc-bugs at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18419