https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99017
--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> --- So while this crashes in the new BB costing part the issue this uncovers is that graph partitioning does not merge two partitions that share a vect_external_def SLP node. But the SLP costing performed during SLP analysis walked the whole graph honoring this sharing. In the end we end up with no vector cost entry. It's not so easy to change graph partitioning so for the moment I'll fixup the BB costing to be more forgiving. The way for a real fix is to attach SLP node costings to the individual nodes when doing analysis and only gather them during partition costing. But that's for next stage1.
