[Bug target/122853] RISC-V: Wrong code with RVV loop vectorization: vwsubu.vv used producing wrong results

[chenzhongyao.hit at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122853

--- Comment #9 from Zhongyao Chen <chenzhongyao.hit at gmail dot com> ---
I plan to submit a testcase patch later, prevent regression.