[Bug target/123954] [riscv64, vector] missed optimization, extra move instruction

[jpegqs at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123954

--- Comment #1 from Ilya Kurdyukov <jpegqs at gmail dot com> ---
It might be worth asking for clarification in the RVV spec as to which of
vs1/vs2 is more important in this case.