On 9 May 2014 15:21, erik quanstrom <quanstro@quanstro.net> wrote:

> on 64-bit machines, the unions in the ureg.h can lead to
> internal padding.
>

although one tactic not yet implemented, but soon ..., is to make struct
and union alignment
match the least alignment required, as is done for arrays, the approach on
amd64 and arm64
is simply not to bother with the unions. if it's sp, it's sp. link is link.
i think the need for the alias
has gone. there aren't any references in port, which i think might have
caused the aliasing
in the first place, and xyz/trap.c should know what's what.