[Bug tree-optimization/125250] [16/17 Regression] wrong code at -O1/2/3

[xxs_chy at outlook dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=125250

--- Comment #1 from XChy <xxs_chy at outlook dot com> ---
Testcase without violating strict aliasing rule:
https://godbolt.org/z/eqq5xMGj6