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

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

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

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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          Component|target                      |libstdc++

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
>From just looking at the assembler snippets it seems there's an extra copy
that's no longer elided.  Since the change was triggered by a standard library
change let's classify as that.