https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123156
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> --- So guess we should sorry for __builtin_shufflevector calls for 8-bit elements with vector size 256 or more when we need indexes 256+ because those aren't representable. We have a similar case with 16-bit elements and vectors with 65536+ elements.
