[Bug tree-optimization/89755] New: Inefficient runtime alias check

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89755

            Bug ID: 89755
           Summary: Inefficient runtime alias check
           Product: gcc
           Version: 9.0
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: rguenth at gcc dot gnu.org
  Target Milestone: ---

For the testcase in PR87561 the runtime alias check ends up too complicated
since it could simply compare a single index that is even loop invariant in
the enclosing loop.  The vectorizer should also consider applying versioning
to outer loops for the runtime alias check.