[Bug tree-optimization/71408] [7 Regression] wrong code at -Os and above on x86_64-linux-gnu

[kugan at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71408

--- Comment #3 from kugan at gcc dot gnu.org ---
Looking into it. Looks like zero_one_operation is still broken.