Re: Here come the 128-bit pointers

From	BGB <cr88192@gmail.com>
Newsgroups	comp.lang.c
Subject	Re: Here come the 128-bit pointers
Date	2022-01-26 20:34 -0600
Organization	A noiseless patient Spider
Message-ID	<sst0ci$9e2$1@dont-email.me> (permalink)
References	(4 earlier) <ssprrc$d8h$1@dont-email.me> <ssr1jb$nqj$1@dont-email.me> <sssabd$625$1@dont-email.me> <ssseqb$717$1@dont-email.me> <FmjIJ.23550$bO.12378@fx11.iad>

Show all headers | View raw

On 1/26/2022 3:50 PM, Scott Lurndal wrote:
> BGB <cr88192@gmail.com> writes:
>> On 1/26/2022 2:18 PM, Bart wrote:
> 
> 
>>> I think the chip makers are just desperately trying to find more uses
>>> for wider GP registers.
>>
>> Could be.
> 
> Come on, get real.  The documents referred to in the original post
> indicate -very clearly- the whys and wherefores of the Morello architecture.
> 
> None of them are "to desperately find more uses for wider GP regisers".
> 
> That's just flat out ridiculous.
> 
> Security is the goal.
> 

I wasn't saying that security wasn't a goal.

> I'll note that capability architectures have been running in production
> since the B6500 was released in 1969 (with a 51-bit word where the high
> three bits were protected tag bits that differentiated capabilities from
> normal 48-bit words).
> 

Possibly, but:
I feel doubtful that it is necessarily the best approach from a 
cost/benefit perspective.

Not mentioned thus far, as that it is likely to need another 
special-purpose cache mostly to keep track of a bitmap of tag bits or 
similar.

...

It is also notable that historically, computers have tended more for 
fast and cheap solutions to problems, rather than heavyweight and 
expensive solutions.

There were some oddities here, like OoO winning out over VLIW in 
mainstream CPUs, but this may change as Moore's Law comes to an end...
Say, VLIW gets to see its time in the sun in the aftermath of the 
consequences of "The Great Plateau...".

Or such...

Thread

Here come the 128-bit pointers scott@slp53.sl.home (Scott Lurndal) - 2022-01-24 18:12 +0000
  Re: Here come the 128-bit pointers Dan Purgert <dan@djph.net> - 2022-01-24 18:31 +0000
  Re: Here come the 128-bit pointers BGB <cr88192@gmail.com> - 2022-01-24 15:41 -0600
  Re: Here come the 128-bit pointers Bonita Montero <Bonita.Montero@gmail.com> - 2022-01-25 08:25 +0100
    Re: Here come the 128-bit pointers BGB <cr88192@gmail.com> - 2022-01-25 02:31 -0600
      Re: Here come the 128-bit pointers Öö Tiib <ootiib@hot.ee> - 2022-01-25 02:04 -0800
        Re: Here come the 128-bit pointers scott@slp53.sl.home (Scott Lurndal) - 2022-01-25 14:48 +0000
        Re: Here come the 128-bit pointers BGB <cr88192@gmail.com> - 2022-01-25 11:54 -0600
          Re: Here come the 128-bit pointers scott@slp53.sl.home (Scott Lurndal) - 2022-01-25 18:23 +0000
            Re: Here come the 128-bit pointers BGB <cr88192@gmail.com> - 2022-01-25 14:17 -0600
          Re: Here come the 128-bit pointers David Brown <david.brown@hesbynett.no> - 2022-01-26 09:36 +0100
            Re: Here come the 128-bit pointers Theo <theom+news@chiark.greenend.org.uk> - 2022-01-28 22:12 +0000
      Re: Here come the 128-bit pointers Bonita Montero <Bonita.Montero@gmail.com> - 2022-01-25 19:49 +0100
        Re: Here come the 128-bit pointers BGB <cr88192@gmail.com> - 2022-01-25 15:59 -0600
          Re: Here come the 128-bit pointers scott@slp53.sl.home (Scott Lurndal) - 2022-01-25 22:25 +0000
          Re: Here come the 128-bit pointers Bonita Montero <Bonita.Montero@gmail.com> - 2022-01-26 09:43 +0100
            Re: Here come the 128-bit pointers scott@slp53.sl.home (Scott Lurndal) - 2022-01-26 15:53 +0000
              Re: Here come the 128-bit pointers Bonita Montero <Bonita.Montero@gmail.com> - 2022-01-26 17:25 +0100
            Re: Here come the 128-bit pointers Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2022-01-26 08:34 -0800
              Re: Here come the 128-bit pointers Bonita Montero <Bonita.Montero@gmail.com> - 2022-01-26 17:57 +0100
              Re: Here come the 128-bit pointers Bart <bc@freeuk.com> - 2022-01-26 17:10 +0000
                Re: Here come the 128-bit pointers scott@slp53.sl.home (Scott Lurndal) - 2022-01-26 17:27 +0000
                Re: Here come the 128-bit pointers Bart <bc@freeuk.com> - 2022-01-26 17:41 +0000
                Re: Here come the 128-bit pointers scott@slp53.sl.home (Scott Lurndal) - 2022-01-26 18:05 +0000
                Re: Here come the 128-bit pointers Bart <bc@freeuk.com> - 2022-01-26 18:23 +0000
                Re: Here come the 128-bit pointers BGB <cr88192@gmail.com> - 2022-01-26 14:42 -0600
                Re: Here come the 128-bit pointers BGB <cr88192@gmail.com> - 2022-01-26 14:30 -0600
              Re: Here come the 128-bit pointers Mateusz Viste <mateusz@xyz.invalid> - 2022-01-26 19:36 +0100
                Re: Here come the 128-bit pointers scott@slp53.sl.home (Scott Lurndal) - 2022-01-26 18:52 +0000
            Re: Here come the 128-bit pointers tth <tth@none.invalid> - 2022-01-26 21:01 +0100
            Re: Here come the 128-bit pointers Bart <bc@freeuk.com> - 2022-01-26 20:18 +0000
              Re: Here come the 128-bit pointers BGB <cr88192@gmail.com> - 2022-01-26 15:35 -0600
                Re: Here come the 128-bit pointers scott@slp53.sl.home (Scott Lurndal) - 2022-01-26 21:50 +0000
                Re: Here come the 128-bit pointers BGB <cr88192@gmail.com> - 2022-01-26 20:34 -0600
                Re: Here come the 128-bit pointers Bart <bc@freeuk.com> - 2022-01-27 12:11 +0000
                Re: Here come the 128-bit pointers BGB <cr88192@gmail.com> - 2022-01-27 13:40 -0600
        Re: Here come the 128-bit pointers William Ahern <william@25thandClement.com> - 2022-01-27 13:28 -0800
  Re: Here come the 128-bit pointers Theo Markettos <theom+news@chiark.greenend.org.uk> - 2022-01-28 23:18 +0000

csiph-web