On Tue, Jul 30, 2024 at 03:00:49PM +0200, Richard Biener wrote:
> As Jakub said the padding is already dealt with in the caller
> though I only added that there for convenience since padding is
> problematic in general.
>
> If you think XFmode is safe to transfer 10 bytes we could enable it,
> I guess I'll amend the docs to be clear:
>
> "Define this to return false if the mode @var{mode} cannot be used
> for memory copying. The default is to assume modes with the same
> precision as size are fine to be used."
>
> this might suggest transfering GET_MODE_PRECISION bits is intended
> but it might want to say GET_MODE_SIZE units explicitly so the
> default makes sense.
You could just gcc_unreachable (); for XFmode in the link with a short
comment that the mode has padding.
Jakub
