[Bug middle-end/117453] Miscompile with -O3 and -O0/1/2

[yunboni at smail dot nju.edu.cn via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117453

--- Comment #1 from Yunbo Ni <yunboni at smail dot nju.edu.cn> ---
I'm not sure if it is a duplicate case.