[RFC PATCH 1/8] RISC-V: Minimal support of bitmanip extension

[Christoph Muellner]

On Mon, Oct 18, 2021 at 10:48 AM Kito Cheng <kito.cheng@sifive.com> wrote:
>
> Hi Christoph:
>
> > I think this needs another specification class (there is a
> > specification for the instructions and it is in public review).
> > Proposal: ISA_SPEC_CLASS_FROZEN_2021
>
> That's a good point, but ISA_SPEC_CLASS_FROZEN_2021 is hard to
> reference to which spec, so I would prefer to add a -misa-spec=2021 to
> align platform/profile spec, and then ISA_SPEC_CLASS_2021, and before
> RISC-V platform/profile spec has released, let keep
> ISA_SPEC_CLASS_NONE :p

For sure we cannot reference a spec that is not frozen yet (i.e.
platform/profile).
ISA_SPEC_CLASS_FROZEN_2021 was a proposal for all groups of ISA extensions
that have been frozen in 2021 (zb*, zk*, etc.) and will eventually be ratified.
But yes, keeping NONE until the specifications are ratified and change
the specification
class then is also possible.