64-bit ARM far away?

By: Paul A. Clayton (paaronclayton.delete@this.gmail.com), October 24, 2011 8:44 pm
Room: Moderated Discussions
A ARM blog entry--and particularly a response to a comment--( http://blogs.arm.com/smart-connected-devices/603-server-ecosystem-a-fine-kettle-of-fish/ ) seems to indicate that ARM will not be providing a 64-bit extension soon: "We have been very clear in setting the expectation that compute-intensive servers remain 64-bit and, as you note, SPARC-, POWER- or x86-based for a long period of time to come."

This is particularly disappointing to me because I believe
it would be possible to have not only 32-bit and even
I32L64P32 applications running on top of a 64-bit OS (as
opposed to a VMM handling an extended physical address
space), but also to provide two 32-bit contexts and
somewhat less than twice the 32-bit execution resources
(perhaps using width-pipelined ALUs) in a 64-bit core,
allowing a single core design to fit a broader range of
applications. (I admit that I have not thought out the
latter possibility, but a brief consideration seemed to
indicate some potential.)

It is also seems unlikely that there would be that much
power overhead relative to an A-15 for a 64-bit core of
like performance. (It may not be practical to power-gate--
even at extremely high latency--half of the execution
resources and context storage--, though at minimum the
bits cells for the more significant bits could use
probably use a low leakage for zero value cell design.)
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TopicPosted ByDate
64-bit ARM far away?Paul A. Clayton2011/10/24 08:44 PM
  64-bit ARM far away?bakaneko2011/10/24 11:32 PM
    64-bit ARM far away?bakaneko2011/10/25 12:24 AM
  64-bit ARM far away?Wilco2011/10/25 03:10 AM
    64-bit ARM far away?mpx2011/10/25 03:29 AM
      64-bit ARM far away?JS2011/10/25 03:44 AM
        64-bit ARM far away?mpx2011/10/25 05:51 AM
          64-bit ARM far away?Michael S2011/10/25 06:29 AM
      64-bit ARM far away?Heikki Kultala2011/10/25 03:47 AM
        correctionHeikki Kultala2011/10/25 03:50 AM
        64-bit ARM far away?mpx2011/10/25 04:20 AM
          64-bit ARM far away?Wilco2011/10/25 04:33 AM
            64-bit ARM far away?mpx2011/10/25 05:47 AM
              64-bit ARM far away?anon2011/10/25 02:52 PM
      64-bit ARM far away?bakaneko2011/10/25 04:42 AM
        64-bit ARM far away?mpx2011/10/25 04:49 AM
          64-bit ARM far away?Wilco2011/10/25 05:11 AM
          64-bit ARM far away?bakaneko2011/10/25 05:20 AM
    64-bit ARM far away?Steve Underwood2011/10/25 04:20 AM
      64-bit ARM far away?Wilco2011/10/25 05:26 AM
        64-bit ARM far away?David Kanter2011/10/25 08:47 AM
          LPAE == 40 bit physical addressesPaul A. Clayton2011/10/25 09:46 AM
        critical massFoo_2011/10/27 12:49 PM
          critical massWilco2011/10/27 02:34 PM
    64-bit ARM far away?Megol2011/10/25 05:26 AM
      64-bit ARM far away?Wilco2011/10/25 05:38 AM
        64-bit ARM far away?Michael S2011/10/25 06:40 AM
          64-bit ARM far away?Gabriele Svelto2011/10/25 10:08 AM
        64-bit ARM far away?Megol2011/10/25 08:39 AM
    64-bit ARM far away?Michael S2011/10/25 06:24 AM
      Benefit of ABI change?Paul A. Clayton2011/10/25 07:17 AM
        Benefit of ABI change?anon2011/10/25 03:00 PM
      64-bit ARM far away?Wilco2011/10/25 01:13 PM
        64-bit ARM far away?Dan Fay2011/10/25 02:03 PM
        Does anyone have actual data?Paul A. Clayton2011/10/25 03:08 PM
          Does anyone have actual data?Wilco2011/10/26 05:01 AM
            No cost vs. acceptable cost/benefitPaul A. Clayton2011/10/26 06:59 AM
              No cost vs. acceptable cost/benefitMichael S2011/10/26 09:31 AM
                No cost vs. acceptable cost/benefitWilco2011/10/27 02:33 AM
                No cost vs. acceptable cost/benefitanon2011/10/28 10:32 PM
                  No cost vs. acceptable cost/benefitMichael S2011/10/29 01:43 PM
              NEON Performance.Joel2011/11/05 07:13 AM
                NEON Performance.Exophase2011/11/05 12:56 PM
        64-bit ARM far away?Michael S2011/10/25 04:32 PM
          64-bit ARM far away?Wilco2011/10/26 03:51 AM
            SPEC CPU is not that brokenPaul A. Clayton2011/10/26 04:37 AM
            64-bit ARM far away?Michael S2011/10/26 06:27 AM
    64-bit ARM far away?someone2011/10/25 06:25 AM
    Longish argument for 64-bitPaul A. Clayton2011/10/25 06:59 AM
      Longish argument for 64-bitSteve Underwood2011/10/25 07:11 AM
        Longish argument for 64-bitbakaneko2011/10/25 11:00 AM
          Longish argument for 64-bitLinus Torvalds2011/10/26 05:46 AM
            Longish argument for 64-bitanonymous422011/10/28 01:55 PM
              Longish argument for 64-bitLinus Torvalds2011/10/28 03:37 PM
                Longish argument for 64-bitDoug Siebert2011/10/29 11:01 AM
                  Longish argument for 64-bita reader2011/10/30 08:06 AM
                  Longish argument for 64-bitTomas2011/10/31 10:02 AM
              Longish argument for 64-bitanon2011/10/30 07:03 AM
  Or maybe not?Jouni Osmala2011/10/25 06:03 AM
  64-bit ARM far away?none2011/10/25 07:32 AM
  ARM Discloses Technical Details Of The Next Version (64-bit) ARM Architecturemas2011/10/27 09:38 AM
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