[Bug tree-optimization/107273] wrong code at -O3 on x86_64-linux-gnu by r13-3281

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107273

--- Comment #8 from H.J. Lu <hjl.tools at gmail dot com> ---
-O2 -funswitch-loops also triggers this bug.