[Bug tree-optimization/100453] [12 Regression] wrong code at -O1 and above since r12-434

[jamborm at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100453

--- Comment #13 from Martin Jambor <jamborm at gcc dot gnu.org> ---
Another attempt to fix this:
https://gcc.gnu.org/pipermail/gcc-patches/2021-June/572814.html