[Bug target/120428] [14/15/16 regression] Suboptimal autovec involving blocked permutation and std::copy

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120428

--- Comment #7 from Jonathan Wakely <redi at gcc dot gnu.org> ---
This was backported as r14-10608-g27dc1533b6dfc4 and r13-8987-gaea374238cec1a
and r12-10682-gb4bc34db3f2948