https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78420
--- Comment #25 from Jason Merrill <jason at gcc dot gnu.org> --- (In reply to Jakub Jelinek from comment #23) > One possibility would be a __builtin_constant_p-like builtin that would fold > to false much earlier than the current __builtin_constant_p, e.g. during > gimplification. I think this would only be useful for C++ constexpr evaluation, since most uses in C depend on being folded after inlining.
