[libre-riscv-dev] PowerISA 3.1 (Power10) spec released

[Jacob Lifshay]

On Mon, May 11, 2020, 23:43 Lauri Kasanen <cand at gmx.com> wrote:

> On Mon, 11 May 2020 23:27:38 -0700
> Jacob Lifshay <programmerjake at gmail.com> wrote:
>
> > On Mon, May 11, 2020, 23:01 Lauri Kasanen <cand at gmx.com> wrote:
> >
> > > Hi,
> > >
> > > The thing that stood out to me in the levels was BE/LE. An int or float
> > > compatible Power processor must support BE, LE is optional at those
> > > levels. A Linux level processor must support LE, BE is optional at that
> > > level. However the Linux level requires SIMD.
> > >
> > > So this means that our int+float processor must support BE.
> >
> > not necessarily, it defines 4 compatibility levels, notice that all
> > features included in higher levels are not forbidden in lower levels, so
> we
> > could claim to be 100% compatible with the lowest level
>
> No, we couldn't. The lowest level, int only, has the same BE
> requirement.
>

Ok, sounds like we definitely need to talk to OpenPower about this.

Jacob