https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120704
--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> --- (In reply to Andrew Pinski from comment #1) > I am 100% sure this is undefined behavior free. > Sorry missing not in the first sentence. That it should be: I am not 100% sure this is undefined behavior free. > We have: > &c +l + cst > > The only defined value for l is 0 or 1. > > And with cst not being 0 or 1, this is almost definitely undefined.
