https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114417
--- Comment #11 from Imple Lee <lee.imple at gmail dot com> --- > What you want to use instead is std::experimental::simd_abi::deduce_t<T, N>. > That'll give you a not-fixed_size ABI if one exists. And those will likely be > passed via registers (as long as the psABI allows). Great! It does work as intended. Thank you for telling me that. Maybe all I need is just to read the docs on cppref more carefully :|