[Bug middle-end/91213] Missed optimization: (sub X Y) -> (xor X Y) when Y <= X and isPowerOf2(X + 1)

[rdapp at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91213

--- Comment #9 from rdapp at gcc dot gnu.org ---
The regressions are unrelated and due to another patch that I still had on the
same branch.