[Bug tree-optimization/123343] Loop unrolling before vectorization produces suboptimal RISC-V code

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123343

--- Comment #14 from Zhongyao Chen <chenzhongyao.hit at gmail dot com> ---
Created attachment 63341
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=63341&action=edit
patch

Please take a quick look. If this looks OK, I'll submit to the mailing list.