[Libre-soc-dev] fantastically-weird regfile

Jacob Lifshay programmerjake at gmail.com
Mon Dec 14 03:11:23 GMT 2020

On Sun, Dec 13, 2020 at 5:50 PM Luke Kenneth Casson Leighton
<lkcl at lkcl.net> wrote:
> On 12/14/20, Jacob Lifshay <programmerjake at gmail.com> wrote:
> > That's very similar to what I already did for int and fp registers, see:
> >
> > https://libre-soc.org/openpower/sv/svp_rewrite/svp64/
> >
> jacob once it's been documented the regfile stratification,
> allocation, port numbering etc can be evaluated, as well as the Dep
> Matrix layout

Basic summary: they're conceptually organized differently, but
microarchitecturally they are the exact same flat reg-file we always
The purpose of the organization is to make it obvious how the standard
32 registers fit into the scheme, and how it can be expanded in the
future (by adding more registers between each standard register,
rather than adding more registers at the end, making instructions be
automatically able to address all the new registers by just using a
larger VL).


More information about the Libre-soc-dev mailing list