https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103941
--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> --- I think I've seen this before - the use in the conversion is elided in the vector path via recognizing a pattern of a pattern - that makes it not part of the SLP tree and thus left as SLP_TYPE (..) = loop_vect, fooling the live computation. vect_detect_hybrid_slp now does this in a more correct way but the original worklist seeding has to be done differently for BB SLP.
