[Bug tree-optimization/82192] gcc produces incorrect code with -O2 and bit-field

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82192

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Does -fsantize=undefined show anything?

I am suspecting you have undefined behavior with respect to the shift.