[Bug tree-optimization/116566] New: SLP induction unsupported for variable-length vectors (even for group_size == 1)

[rguenth at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116566

            Bug ID: 116566
           Summary: SLP induction unsupported for variable-length vectors
                    (even for group_size == 1)
           Product: gcc
           Version: 15.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: rguenth at gcc dot gnu.org
  Target Milestone: ---

This blocks the SLP transition.  We should be able to use build_vec_series
and for group_size > 1 interleave those vectors (though group_size > 1 support
is not priority).

gcc.dg/vect/slp-19c.c fails to fully SLP for this for example.