https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56592
--- Comment #4 from Oleg Endo <olegendo at gcc dot gnu.org> ---
(In reply to Oleg Endo from comment #0)
>
> Function argument/return value aggregates are decomposed so that the
> individual members can be passed in different register classes, based on the
> data type. E.g.
>
> ...
>
> struct FuncArg
> {
> float a; // -> fr4
> float b; // -> fr5
> float c; // -> fr6
> float d; // -> fr7
> };
>
Maybe such simple cases can be handled by implementing
TARGET_ARRAY_MODE_SUPPORTED_P
