[Bug target/56592] [SH] Add vector ABI

[olegendo at gcc dot gnu.org]

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