[Bug target/111720] RISC-V: Ugly codegen in RVV

[juzhe.zhong at rivai dot ai via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111720

--- Comment #1 from JuzheZhong <juzhe.zhong at rivai dot ai> ---
The root cause is unnecessary VLS modes data movement:

(insn 10 9 11 2 (set (reg:V4DI 143)
        (mem/u/c:V4DI (reg:DI 142) [0  S32 A128])) "/app/example.c":4:13 1119
{*movv4di}
     (nil))
(insn 11 10 12 2 (set (mem/c:V4DI (reg:DI 141) [0  S32 A128])
        (reg:V4DI 143)) "/app/example.c":4:13 1119 {*movv4di}
     (nil))