[Bug tree-optimization/60042] New: vectorizer still does too many dependence tests for himeno:jacobi

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60042

            Bug ID: 60042
           Summary: vectorizer still does too many dependence tests for
                    himeno:jacobi
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Keywords: missed-optimization
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: rguenth at gcc dot gnu.org

Created attachment 32026
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=32026&action=edit
himeno bench

I still get

himenobmtxpa.c:296:9: note: disable versioning for alias - max number of
generated checks exceeded
himenobmtxpa.c:296:9: note: too long list of versioning for alias run-time
tests.

I have a patch to remove some false dependences but still

himenobmtxpa.c:296:9: note: improved number of alias checks from 31 to 21

and 21 is too much - 7 should suffice.