https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94383
--- Comment #9 from Matthew Malcomson <matmal01 at gcc dot gnu.org> --- (In reply to Jakub Jelinek from comment #8) > I'd like to ping this, it would be nice to at least decide if this should be > handled for GCC10 or postponed to GCC11 only. Hi Jakub -- I'm taking a look at this at the moment, so I'm hoping I can get it done for GCC10. So far I've only double checked what the AAPCS64 says and confirmed that we're producing the correct code for gnu++14 and not gnu++17 (the base class is empty and a language type that occupies zero bytes has no mapping on the ABI level, hence that `pair` structure is an HFA and should be passed in the vector registers). I'm just about to start looking at changes & testing.