[Bug tree-optimization/66952] [6 Regression] wrong code at -O2 and -O3 on x86_64-linux-gnu

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66952

--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Started with r225861.