[Libre-soc-isa] next ISA WG RFC

[Luke Kenneth Casson Leighton]

On Monday, March 6, 2023, Jacob Lifshay <programmerjake at gmail.com> wrote:
> On Mon, Mar 6, 2023, 10:40 Jacob Lifshay <programmerjake at gmail.com> wrote:
>>
>> On Mon, Mar 6, 2023, 10:10 Jacob Lifshay <programmerjake at gmail.com>
wrote:
>>>
>>> On Mon, Mar 6, 2023, 04:10 Luke Kenneth Casson Leighton <lkcl at lkcl.net>
wrote:
>>>>
>>>> * carryless mul/div/mod
>>>
>>> these are basically good to go, though imho are less critical so can be
left for later when we need a break from more complex stuff.
>>
>> imho carryless mul should be left till after submitting basic SVP64 FFT
support, otherwise `cltmadd` has little justification as a scalar op.
>
> alternative idea: submit everything but cltmadd to avoid someone else
submitting an alternative clmul first in a way that doesn't work well with
our proposal. cltmadd can then later be submitted as a separate RFC as
SVP64 FFT support for clmul.

ack, makes sense.

ohh yargh, integer DCT/FFT maddsubs need designing as well,
that'll be fun as bitlevel accuracy is needed, ARM even divides
by 2 and rounds so as not to drop too many bits.

l.


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