Initial 64-bit ARM *can* run older 32-bit ARM code

By: Linus Torvalds (torvalds.delete@this.linux-foundation.org), August 20, 2013 3:05 pm
Room: Moderated Discussions
Ricardo B (ricardo.b.delete@this.xxxxxx.xx) on August 20, 2013 3:27 pm wrote:
>
> Incurring the risk of your wrath, I think it would have been a good time to drop
> BCD, x87, MMX, 3d!now, ah/bh/ch/dh and probably some more stuff like that.

The thing you don't seem to understand is that AMD *couldn't* drop those things.

Why? Because you still need the hardware and logic for them for legacy mode. You can't get rid of the high-byte logic, since it's still needed.

So at most, AMD could drop these features from the x86-64 instruction decoding map. But the hardware would have to be there anyway, and the instruction decoders would still have to be there. Remember: x86 long more is sharing all of that with the legacy mode, and it needed to do that for good reasons (that I outlined).

Now, AMD did that opcode map cleanup for the inc/dec instructions, but there the upside was that those took up a lot of opcode space that could be used better for other things. The same just wasn't true of random individual instructions.

Yes, AAD and AAM are totally worthless instructions, and they are in that one-byte opcode space that could have been used for something else. But they are just two ops in that opcode space, and what use for them would you have that would be so important that it would argue for the need of decoding them differently in long mode than in other modes?

AMD did the right thing. Really.

And AMD did drop x87 in the only way that matters - the long mode function call ABI no longer uses it. But no, there's no way in hell the actual hardware support for it could be dropped, exactly because in order to introduce a new architecture, you still want to run all those old programs.

Seriously. The history of computer architecture is absolutely chock-full of people who thought they could introduce a new and cleaner architecture, and drop support for old legacy stuff that "didn't matter". And you still - in 2013 - make that same argument?

Paraphrasing Santayana: "Those who cannot remember the past are f*cking morons".

Linus
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TopicPosted ByDate
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          Trusted Foundry programMax2013/08/06 11:51 AM
          Trusted Foundry programKevin G2013/08/07 07:08 AM
            Trusted Foundry programMark Roulo2013/08/07 08:55 AM
              Trusted Foundry programKevin G2013/08/07 10:00 AM
  is it?Michael S2013/08/06 02:05 PM
    is it?Mark Roulo2013/08/06 03:16 PM
      is it?anon2013/08/06 04:30 PM
    is it?Eric2013/08/06 03:31 PM
      is it?Kira2013/08/06 04:17 PM
        is it?Eric2013/08/06 08:45 PM
  How does Power compare to ARM / MIPS?Drazick2013/08/11 02:27 AM
    How does Power compare to ARM / MIPS?Kira2013/08/11 03:52 PM
    How does Power compare to ARM / MIPS?Michael S2013/08/12 03:08 AM
    How does Power compare to ARM / MIPS?Brett2013/08/12 05:50 PM
      How does Power compare to ARM / MIPS?Mark Roulo2013/08/13 09:11 AM
        How does Power compare to ARM / MIPS?none2013/08/13 09:22 AM
          How does Power compare to ARM / MIPS?none2013/08/13 09:23 AM
        How does Power compare to ARM / MIPS?EduardoS2013/08/13 10:42 AM
          How does Power compare to ARM / MIPS?Exophase2013/08/13 11:27 AM
            How does Power compare to ARM / MIPS?Patrick Chase2013/08/15 11:17 AM
              How does Power compare to ARM / MIPS?David Hess2013/08/15 01:38 PM
                How does Power compare to ARM / MIPS?Mark Roulo2013/08/15 02:31 PM
                  How does Power compare to ARM / MIPS?EduardoS2013/08/15 07:45 PM
                    How does Power compare to ARM / MIPS?Patrick Chase2013/08/15 07:54 PM
                      How does Power compare to ARM / MIPS?EduardoS2013/08/15 08:21 PM
                How does Power compare to ARM / MIPS?Patrick Chase2013/08/15 06:47 PM
              How does Power compare to ARM / MIPS?Exophase2013/08/15 06:56 PM
                How does Power compare to ARM / MIPS?Patrick Chase2013/08/15 07:41 PM
        Server and Embedded "environments" are still distinguishedPaul A. Clayton2013/08/13 05:31 PM
        How does Power compare to ARM / MIPS?Michael S2013/08/14 12:45 AM
        How does Power compare to ARM / MIPS?Brett2013/08/14 07:17 PM
          How does Power compare to ARM / MIPS?anon2013/08/14 11:13 PM
            How does Power compare to ARM / MIPS?David Kanter2013/08/15 12:23 AM
              How does Power compare to ARM / MIPS?anon2013/08/15 02:51 AM
                How does Power compare to ARM / MIPS?someone2013/08/15 10:46 AM
          How does Power compare to ARM / MIPS?none2013/08/15 02:47 AM
          How does Power compare to ARM / MIPS?Doug S2013/08/15 08:46 AM
            How does Power compare to ARM / MIPS?David Kanter2013/08/15 11:48 AM
              Initial 64-bit ARM *can* run older 32-bit ARM codeMark Roulo2013/08/15 12:56 PM
                Initial 64-bit ARM *can* run older 32-bit ARM codeRonald Maas2013/08/19 08:19 PM
                  Initial 64-bit ARM *can* run older 32-bit ARM codeanon2013/08/20 12:58 AM
                    Initial 64-bit ARM *can* run older 32-bit ARM codeLinus Torvalds2013/08/20 09:58 AM
                      Initial 64-bit ARM *can* run older 32-bit ARM codeRicardo B2013/08/20 02:27 PM
                        Initial 64-bit ARM *can* run older 32-bit ARM coderwessel2013/08/20 03:04 PM
                        Initial 64-bit ARM *can* run older 32-bit ARM codeLinus Torvalds2013/08/20 03:05 PM
                          Initial 64-bit ARM *can* run older 32-bit ARM codeMichael S2013/08/20 03:54 PM
                            Initial 64-bit ARM *can* run older 32-bit ARM codeLinus Torvalds2013/08/20 04:09 PM
                          Initial 64-bit ARM *can* run older 32-bit ARM codeTREZA2013/08/21 05:06 AM
                            Initial 64-bit ARM *can* run older 32-bit ARM codeLinus Torvalds2013/08/21 08:50 AM
                              Initial 64-bit ARM *can* run older 32-bit ARM codeTREZA2013/08/21 11:39 AM
                          Initial 64-bit ARM *can* run older 32-bit ARM codeRicardo B2013/08/22 04:25 AM
                            Initial 64-bit ARM *can* run older 32-bit ARM codeEduardoS2013/08/22 05:59 AM
                              Initial 64-bit ARM *can* run older 32-bit ARM codeRicardo B2013/08/22 06:28 AM
                                Initial 64-bit ARM *can* run older 32-bit ARM codeEduardoS2013/08/22 07:36 AM
                                  Initial 64-bit ARM *can* run older 32-bit ARM codeRicardo B2013/08/22 08:21 AM
                                    Initial 64-bit ARM *can* run older 32-bit ARM codeEduardoS2013/08/22 09:02 AM
                        Initial 64-bit ARM *can* run older 32-bit ARM codeGabriele Svelto2013/08/21 02:26 AM
                          Initial 64-bit ARM *can* run older 32-bit ARM codeRicardo B2013/08/22 04:43 AM
                            Initial 64-bit ARM *can* run older 32-bit ARM codeRicardo B2013/08/22 04:47 AM
                        Initial 64-bit ARM *can* run older 32-bit ARM codeDan Fay2013/08/21 12:13 PM
                          Initial 64-bit ARM *can* run older 32-bit ARM codeDavid Hess2013/08/22 09:55 AM
                            Initial 64-bit ARM *can* run older 32-bit ARM codegallier22013/08/22 11:35 AM
                              Initial 64-bit ARM *can* run older 32-bit ARM codeDavid Hess2013/08/22 12:26 PM
                      Initial 64-bit ARM *can* run older 32-bit ARM codeRonald Maas2013/08/20 04:38 PM
                      Initial 64-bit ARM *can* run older 32-bit ARM codeanon2013/08/20 05:07 PM
                        Initial 64-bit ARM *can* run older 32-bit ARM codeMichael S2013/08/21 04:15 AM
                          Initial 64-bit ARM *can* run older 32-bit ARM codeanon2013/08/21 05:01 AM
                      An elaborate theory of why AMD64 succeeded2013/08/20 10:29 PM
                        An elaborate theory of why AMD64 succeededanon2013/08/21 01:09 AM
                          An elaborate theory of why AMD64 succeeded2013/08/21 03:12 AM
                            An elaborate theory of why AMD64 succeededbakaneko2013/08/21 03:39 AM
                              An elaborate theory of why AMD64 succeeded2013/08/21 04:20 AM
                                An elaborate theory of why AMD64 succeededbakaneko2013/08/21 04:41 AM
                                  An elaborate theory of why AMD64 succeeded2013/08/21 05:47 AM
                                    An elaborate theory of why AMD64 succeededbakaneko2013/08/21 06:26 AM
                            An elaborate theory of why AMD64 succeededanon2013/08/21 04:40 AM
                              An elaborate theory of why AMD64 succeeded2013/08/21 05:47 AM
                                Mod? (NT)anon2013/08/21 06:28 AM
                                  An elaborate theory of why AMD64 succeeded2013/08/21 07:34 AM
                                    An elaborate theory of why AMD64 succeededanon2013/08/21 08:04 AM
                                OK, let's try and keep this productiveDavid Kanter2013/08/21 12:27 PM
                                  OK, let's try and keep this productivePatrick Chase2013/08/21 10:42 PM
                                    OK, let's try and keep this productiveGabriele Svelto2013/08/22 01:48 AM
                                    OK, let's try and keep this productivePatrick Chase2013/08/22 08:03 AM
                                  OK, let's try and keep this productiveanon2013/08/21 11:47 PM
                            An elaborate theory of why AMD64 succeededCarlie Coats2013/08/21 05:31 AM
                              An elaborate theory of why AMD64 succeeded2013/08/21 05:59 AM
                              An elaborate theory of why AMD64 succeededMichael S2013/08/21 06:15 AM
                                An elaborate theory of why AMD64 succeededCarlie Coats2013/08/21 11:25 AM
                                  switched to write-only mode? (NT)Michael S2013/08/21 12:43 PM
                                  An elaborate theory of why AMD64 succeededrwessel2013/08/21 12:53 PM
                                  An elaborate theory of why AMD64 succeededMichael S2013/08/21 01:13 PM
                                  An elaborate theory of why AMD64 succeededBrett2013/08/21 05:25 PM
                                    An elaborate theory of why AMD64 succeededCarlie Coats2013/08/22 03:36 AM
                            An elaborate theory of why AMD64 succeededanon2013/08/21 05:46 AM
                              An elaborate theory of why AMD64 succeeded2013/08/21 06:07 AM
                                An elaborate theory of why AMD64 succeededanon2013/08/21 06:27 AM
                            An elaborate theory of why AMD64 succeededVincent Diepeveen2013/08/31 01:24 AM
                          An elaborate theory of why AMD64 succeededCarlie Coats2013/08/21 05:24 AM
                            An elaborate theory of why AMD64 succeededMichael S2013/08/21 06:03 AM
                              An elaborate theory of why AMD64 succeededCarlie Coats2013/08/21 11:27 AM
                        An elaborate theory of why AMD64 succeededStubabe2013/08/21 08:43 AM
                          An elaborate theory of why AMD64 succeededMichael S2013/08/21 09:02 AM
                            An elaborate theory of why AMD64 succeededStubabe2013/08/21 09:37 AM
                              An elaborate theory of why AMD64 succeededKlimax2013/08/21 10:09 AM
                                An elaborate theory of why AMD64 succeededStubabe2013/08/21 03:27 PM
                            An elaborate theory of why AMD64 succeededLinus Torvalds2013/08/21 09:40 AM
                              An elaborate theory of why AMD64 succeededYuhong Bao2013/08/22 12:11 AM
                                An elaborate theory of why AMD64 succeededEduardoS2013/08/22 02:25 AM
                                  An elaborate theory of why AMD64 succeedednone2013/08/22 03:29 AM
                                  An elaborate theory of why AMD64 succeededRicardo B2013/08/22 05:06 AM
                            An elaborate theory of why AMD64 succeededEduardoS2013/08/21 10:58 AM
                            An elaborate theory of why AMD64 succeededanon2013/08/22 12:25 AM
                              An elaborate theory of why AMD64 succeededEduardoS2013/08/22 02:29 AM
                          An elaborate theory of why AMD64 succeededSymmetry2013/08/21 09:51 AM
                            An elaborate theory of why AMD64 succeededStubabe2013/08/21 03:22 PM
                        An elaborate theory of why AMD64 succeededDan Fay2013/08/21 12:43 PM
                        No elaborate theories requiredDoug S2013/08/21 04:18 PM
                          No elaborate theories requiredGabriele Svelto2013/08/22 04:28 AM
                            No elaborate theories requiredDoug S2013/08/22 09:03 AM
                          No elaborate theories requiredDavid Hess2013/08/22 01:38 PM
                            No elaborate theories requiredDoug S2013/08/22 02:30 PM
                              No elaborate theories requiredDavid Hess2013/08/23 08:42 AM
                                No elaborate theories requiredanon2013/08/24 01:09 AM
                                  No elaborate theories requiredDavid Hess2013/08/24 04:36 PM
                        An very bad theory of why AMD64 succeededEric Bron2013/08/23 01:50 AM
                          An very bad theory of why AMD64 succeededEduardoS2013/08/23 03:36 AM
                      How about dropping x87?David Kanter2013/08/21 09:46 AM
                        How about dropping x87?Michael S2013/08/21 10:01 AM
                          How about dropping x87?David Kanter2013/08/21 12:34 PM
                            How about dropping x87?anonymou52013/08/21 05:27 PM
                              How about dropping x87?David Kanter2013/08/22 12:02 AM
                                How about dropping x87?TREZA2013/08/22 02:40 AM
                                How about dropping x87?rwessel2013/08/22 11:41 AM
                        Initial 64-bit ARM *can* run older 32-bit ARM codeLinus Torvalds2013/08/20 07:15 PM
                          Initial 64-bit ARM *can* run older 32-bit ARM codeRonald Maas2013/08/21 11:38 AM
                            Initial 64-bit ARM *can* run older 32-bit ARM codebakaneko2013/08/21 12:17 PM
                            Initial 64-bit ARM *can* run older 32-bit ARM codeMichael S2013/08/21 01:30 PM
                            Initial 64-bit ARM *can* run older 32-bit ARM codemas2013/08/21 05:10 PM
                              Initial 64-bit ARM *can* run older 32-bit ARM codenone2013/08/21 07:25 PM
                                Initial 64-bit ARM *can* run older 32-bit ARM codemas2013/08/22 12:19 AM
                                  Initial 64-bit ARM *can* run older 32-bit ARM codeanon2013/08/22 12:53 AM
                                    Initial 64-bit ARM *can* run older 32-bit ARM codemas2013/08/22 01:07 AM
                                      Initial 64-bit ARM *can* run older 32-bit ARM codemas2013/08/22 01:11 AM
                                        Initial 64-bit ARM *can* run older 32-bit ARM codenone2013/08/22 01:30 AM
                                          Initial 64-bit ARM *can* run older 32-bit ARM codemas2013/08/22 02:34 AM
                                            Initial 64-bit ARM *can* run older 32-bit ARM codenone2013/08/22 05:04 AM
                                              Initial 64-bit ARM *can* run older 32-bit ARM codemas2013/08/22 06:56 AM
                                  Initial 64-bit ARM *can* run older 32-bit ARM codenone2013/08/22 01:09 AM
                                    Initial 64-bit ARM *can* run older 32-bit ARM codemas2013/08/22 01:26 AM
                                      Initial 64-bit ARM *can* run older 32-bit ARM codenone2013/08/22 01:38 AM
                                        Initial 64-bit ARM *can* run older 32-bit ARM codemas2013/08/22 01:52 AM
                                          Initial 64-bit ARM *can* run older 32-bit ARM codenone2013/08/22 02:13 AM
                                  Initial 64-bit ARM *can* run older 32-bit ARM coderwessel2013/08/22 12:06 PM
                                    Initial 64-bit ARM *can* run older 32-bit ARM codemas2013/08/22 12:42 PM
                                      Initial 64-bit ARM *can* run older 32-bit ARM coderwessel2013/08/22 06:06 PM
                                        Initial 64-bit ARM *can* run older 32-bit ARM codeMichael S2013/08/23 03:53 AM
                                          Initial 64-bit ARM *can* run older 32-bit ARM coderwessel2013/08/23 08:14 PM
                                        Initial 64-bit ARM *can* run older 32-bit ARM codeTREZA2013/08/23 11:53 AM
                                    Initial 64-bit ARM *can* run older 32-bit ARM codeMichael S2013/08/22 01:15 PM
                                      Initial 64-bit ARM *can* run older 32-bit ARM coderwessel2013/08/22 06:10 PM
                                        Initial 64-bit ARM *can* run older 32-bit ARM codeMichael S2013/08/23 03:38 AM
                                        Initial 64-bit ARM *can* run older 32-bit ARM codeEugene Nalimov2013/08/23 12:00 PM
                                          Initial 64-bit ARM *can* run older 32-bit ARM codeanon2013/08/24 01:11 AM
                                            Initial 64-bit ARM *can* run older 32-bit ARM codeEugene Nalimov2013/08/26 01:35 PM
                                          Initial 64-bit ARM *can* run older 32-bit ARM codevvid2013/08/28 08:36 AM
                                            Initial 64-bit ARM *can* run older 32-bit ARM codeEugene Nalimov2013/08/29 08:51 AM
                                              Initial 64-bit ARM *can* run older 32-bit ARM codeMax2013/08/30 12:12 PM
                                                Initial 64-bit ARM *can* run older 32-bit ARM codeLinus Torvalds2013/08/30 03:13 PM
                                                  Separate instruction and data registers BAD or NOT, m68kBrett2013/08/30 05:42 PM
                                                    Separate instruction and data registers BAD or NOT, m68kanon2013/08/30 06:29 PM
                                                      Trade-offs are not constantPaul A. Clayton2013/08/31 09:33 AM
                                                      Separate instruction and data registers BAD or NOT, m68kMichael S2013/08/31 10:42 AM
                                                      Separate instruction and data registers BAD or NOT, m68kBrett2013/08/31 01:51 PM
                                                    Separate instruction and data registers BAD or NOT, m68ksomeone2013/08/30 10:15 PM
                                                      Separate instruction and data registers BAD or NOT, m68kBrett2013/08/31 01:54 PM
                                                      Separate instruction and data registers BAD or NOT, m68kBrett2013/08/31 02:08 PM
                                                        Separate instruction and data registers BAD or NOT, m68kanon2013/08/31 06:43 PM
                                                          Separate instruction and data registers BAD or NOT, m68kMichael S2013/09/01 12:07 AM
                                                            Partitioned register sets BAD or NOTBrett2013/09/01 01:03 AM
                                                              Partitioned register sets BAD or NOTPatrick Chase2013/09/01 09:38 AM
                                                                Embedded VLIWPaul A. Clayton2013/09/01 11:54 AM
                                                                  Embedded VLIWPatrick Chase2013/09/01 02:14 PM
                                                                    Thanks for the additional info (NT)Paul A. Clayton2013/09/01 07:54 PM
                                                                Partitioned register sets BAD or NOTPatrick Chase2013/09/01 11:06 PM
                                                                Stop bitsBrett2013/09/02 01:24 PM
                                                                  Stop bitsPatrick Chase2013/09/02 02:00 PM
                                                            Separate instruction and data registers BAD or NOT, m68kanon2013/09/01 09:12 AM
                                                    Separate instruction and data registers BAD or NOT, m68kRichardC2013/08/31 05:03 AM
                                                    Separate instruction and data registers BAD or NOT, m68kMegol2013/09/04 06:04 AM
                                                      Separate instruction and data registers BAD or NOT, m68kBrett2013/09/04 10:27 PM
                                                        Separate instruction and data registers BAD or NOT, m68kMegol2013/09/05 06:32 AM
                                                          Separate instruction and data registers BAD or NOT, m68kgallier22013/09/05 08:37 AM
                                                            Separate instruction and data registers BAD or NOT, m68kMegol2013/09/05 09:48 AM
                                                          Separate instruction and data registers BAD or NOT, m68kJouni Osmala2013/09/05 10:18 AM
                                                            Separate instruction and data registers BAD or NOT, m68kMegol2013/09/06 04:17 AM
                                                            John Mashey post is sorta relevant ...Mark Roulo2013/09/06 08:30 AM
                                                              John Mashey post is sorta relevant ...Megol2013/09/06 10:59 AM
                                                                John Mashey post is sorta relevant ...Brett2013/09/06 05:32 PM
                                                                  John Mashey post is sorta relevant ...Eugene Nalimov2013/09/08 10:10 AM
                                                                    John Mashey post is sorta relevant ...Brett2013/09/08 01:54 PM
                                                                      John Mashey post is sorta relevant ...David Kanter2013/09/08 04:06 PM
                                                                        John Mashey post is sorta relevant ...Brett2013/09/08 06:48 PM
                                                                          John Mashey post is sorta relevant ...Jouni Osmala2013/09/09 05:26 AM
                                                                            John Mashey post is sorta relevant ...Brett2013/09/13 03:51 PM
                                                                              John Mashey post is sorta relevant ...Megol2013/09/14 08:56 AM
                                                                      John Mashey post is sorta relevant ...Eugene Nalimov2013/09/08 05:59 PM
                                                                        John Mashey post is sorta relevant ...Brett2013/09/08 06:55 PM
                                                                        Renesas RX vs x86/68K/VAXMichael S2013/09/09 05:15 AM
                                                  Initial 64-bit ARM *can* run older 32-bit ARM codeEduardoS2013/08/31 10:09 AM
                                                    Initial 64-bit ARM *can* run older 32-bit ARM codeLinus Torvalds2013/08/31 10:34 AM
                                                      Initial 64-bit ARM *can* run older 32-bit ARM codeEduardoS2013/08/31 11:26 AM
                                                        Initial 64-bit ARM *can* run older 32-bit ARM codeLinus Torvalds2013/08/31 01:12 PM
                                                          Initial 64-bit ARM *can* run older 32-bit ARM codeEduardoS2013/08/31 02:49 PM
                                                    Initial 64-bit ARM *can* run older 32-bit ARM codegallier22013/08/31 11:15 AM
                              Initial 64-bit ARM *can* run older 32-bit ARM codeRonald Maas2013/08/21 10:54 PM
                                Initial 64-bit ARM *can* run older 32-bit ARM codemas2013/08/22 12:10 AM
                                Initial 64-bit ARM *can* run older 32-bit ARM codeMichael S2013/08/22 01:47 AM
                                  Initial 64-bit ARM *can* run older 32-bit ARM codemas2013/08/22 02:17 AM
                              Initial 64-bit ARM *can* run older 32-bit ARM codeGabriele Svelto2013/08/22 06:53 AM
                      Initial 64-bit ARM *can* run older 32-bit ARM codeMr. Camel2013/08/23 05:33 AM
                        Initial 64-bit ARM *can* run older 32-bit ARM codeMichael S2013/08/23 06:03 AM
                        Initial 64-bit ARM *can* run older 32-bit ARM codeEduardoS2013/08/23 06:39 AM
                          Initial 64-bit ARM *can* run older 32-bit ARM codeRonald Maas2013/08/23 09:13 AM
                            Initial 64-bit ARM *can* run older 32-bit ARM codeEduardoS2013/08/23 09:28 AM
                        Initial 64-bit ARM *can* run older 32-bit ARM coderwessel2013/08/23 09:14 PM
              How does Power compare to ARM / MIPS?EduardoS2013/08/15 07:35 PM
                How does Power compare to ARM / MIPS?Carlie Coats2013/08/21 11:31 AM
              Mixing 32b and 64b code in a kernelDoug S2013/08/16 08:50 AM
                LPAE is here now!Mark Roulo2013/08/16 09:45 AM
                  LPAE is here now!Patrick Chase2013/08/16 11:29 AM
                    LPAE is here now!anon2013/08/16 05:11 PM
                Mixing 32b and 64b code in a kernelRicardo B2013/08/17 09:52 AM
                  Mixing 32b and 64b code in a kernelLinus Torvalds2013/08/17 10:09 AM
                    Mixing 32b and 64b code in a kernelMax2013/08/18 01:57 PM
                Mixing 32b and 64b code in a kernelCarlie Coats2013/08/21 11:46 AM
            How does Power compare to ARM / MIPS?Ungo2013/08/15 11:59 AM
              How does Power compare to ARM / MIPS?Doug S2013/08/15 06:39 PM
                How does Power compare to ARM / MIPS?Patrick Chase2013/08/15 07:04 PM
                  How does Power compare to ARM / MIPS?Patrick Chase2013/08/15 08:01 PM
                How does Power compare to ARM / MIPS?Jukka Larja2013/08/16 05:54 AM
          How does Power compare to ARM / MIPS?Patrick Chase2013/08/15 06:29 PM
            How does Power compare to ARM / MIPS?Brett2013/08/16 10:34 PM
              How does Power compare to ARM / MIPS?Doug S2013/08/17 10:18 AM
                How does Power compare to ARM / MIPS?Brett2013/08/17 10:35 AM
                  16 vs 32 general purpose registersMark Roulo2013/08/17 10:40 AM
                    16 vs 32 general purpose registersMichael S2013/08/17 01:55 PM
                      16 vs 32 general purpose registersPatrick Chase2013/08/18 03:55 AM
                  How does Power compare to ARM / MIPS?EduardoS2013/08/17 04:30 PM
                How does Power compare to ARM / MIPS?Patrick Chase2013/08/17 11:49 AM
                  > 32 general purpose registersMark Roulo2013/08/17 12:58 PM
                    > 32 general purpose registersMichael S2013/08/17 01:25 PM
                    > 32 general purpose registersPatrick Chase2013/08/17 02:11 PM
                      > 32 general purpose registersExophase2013/08/18 09:17 AM
                        IIRC, AArch32 registers (shadow registers et al.) map onto AArch64 registers (NT)Paul A. Clayton2013/08/18 01:51 PM
                          IIRC, AArch32 registers (shadow registers et al.) map onto AArch64 registersExophase2013/08/18 08:28 PM
                            IIRC, AArch32 registers (shadow registers et al.) map onto AArch64 registersMichael S2013/08/19 01:17 AM
                              IIRC, AArch32 registers (shadow registers et al.) map onto AArch64 registersExophase2013/08/19 07:42 AM
                    > 32 general purpose registersDoug S2013/08/17 11:21 PM
        How does Power compare to ARM / MIPS?Brett2013/08/17 10:20 AM
          How does Power compare to ARM / MIPS?Gabriele Svelto2013/08/18 01:12 PM
            How does Power compare to ARM / MIPS?Exophase2013/08/18 08:35 PM
          How does Power compare to ARM / MIPS?mas2013/08/20 02:29 PM
      How does Power compare to ARM / MIPS?mas2013/08/20 02:15 PM
        How does Power compare to ARM / MIPS?none2013/08/20 02:31 PM
          How does Power compare to ARM / MIPS?mas2013/08/20 03:08 PM
        How does Power compare to ARM / MIPS?Linus Torvalds2013/08/20 02:49 PM
          How does Power compare to ARM / MIPS?mas2013/08/20 04:53 PM
            How does Power compare to ARM / MIPS?Linus Torvalds2013/08/20 06:52 PM
              How does Power compare to ARM / MIPS?mas2013/08/20 11:21 PM
                How does Power compare to ARM / MIPS?Michael S2013/08/21 05:17 AM
                  How does Power compare to ARM / MIPS?mas2013/08/21 06:05 AM
                    How does Power compare to ARM / MIPS?Michael S2013/08/21 06:27 AM
                      How does Power compare to ARM / MIPS?none2013/08/21 06:53 AM
                        How does Power compare to ARM / MIPS?Michael S2013/08/21 07:02 AM
                          XScale wasn't synthesizablePatrick Chase2013/08/21 11:36 AM
                            XScale wasn't synthesizableMichael S2013/08/21 01:00 PM
                              XScale wasn't synthesizablePatrick Chase2013/08/21 02:02 PM
                              XScale wasn't synthesizablePatrick Chase2013/08/21 02:11 PM
                      How does Power compare to ARM / MIPS?mas2013/08/21 07:45 AM
                  How does Power compare to ARM / MIPS?mas2013/08/22 03:08 AM
            How does Power compare to ARM / MIPS?Doug S2013/08/20 09:47 PM
              How does Power compare to ARM / MIPS?Michael S2013/08/21 06:32 AM
              How does Power compare to ARM / MIPS?Patrick Chase2013/08/21 07:37 AM
              How does Power compare to ARM / MIPS?Patrick Chase2013/08/21 10:45 AM
                How does Power compare to ARM / MIPS?EduardoS2013/08/21 11:02 AM
                  How does Power compare to ARM / MIPS?Patrick Chase2013/08/21 11:27 AM
                    How does Power compare to ARM / MIPS?Patrick Chase2013/08/21 11:47 AM
                      Is simplistic prediction still prediction?Paul A. Clayton2013/08/21 02:59 PM
                        Is simplistic prediction still prediction?Patrick Chase2013/08/22 11:16 AM
                          More like always not-taken, but yeah lame prediction (NT)Paul A. Clayton2013/08/22 12:27 PM
                      How does Power compare to ARM / MIPS?Linus Torvalds2013/08/21 03:25 PM
                        Athlon did something similar (but no dirty special case)Paul A. Clayton2013/08/21 06:47 PM
                          Athlon did something similar (but no dirty special case)Patrick Chase2013/08/22 11:13 AM
                        How does Power compare to ARM / MIPS?Patrick Chase2013/08/22 10:56 AM
                        How does Power compare to ARM / MIPS?Patrick Chase2013/08/22 11:29 AM
                          How does Power compare to ARM / MIPS?Linus Torvalds2013/08/22 12:40 PM
                    How does Power compare to ARM / MIPS?anon2013/08/21 11:45 PM
                      How does Power compare to ARM / MIPS?Niels Jørgen Kruse2013/08/22 01:38 AM
                        How does Power compare to ARM / MIPS?Michael S2013/08/22 01:58 AM
                      How does Power compare to ARM / MIPS?Patrick Chase2013/08/22 07:44 AM
                        Are you sure P4 used IP-based way prediction?Paul A. Clayton2013/08/22 01:04 PM
                          Are you sure P4 used IP-based way prediction?Patrick Chase2013/08/22 02:40 PM
                        How does Power compare to ARM / MIPS?Patrick Chase2013/08/24 09:19 AM
                          How does Power compare to ARM / MIPS?Anon2013/08/25 12:15 AM
                            How does Power compare to ARM / MIPS?Patrick Chase2013/08/25 06:49 PM
                              Replay tornadoes? Paul A. Clayton2013/08/25 07:43 PM
                        How does Power compare to ARM / MIPS?anon2013/08/25 03:22 PM
                          How does Power compare to ARM / MIPS?anonymou52013/08/25 03:35 PM
                            I have the date and topic for a P4 Dcache postPaul A. Clayton2013/08/25 07:34 PM
                              Obviously that should have been "anonymous (no@spam.com)" (NT)Paul A. Clayton2013/08/25 07:45 PM
                              I have the date and topic for a P4 Dcache postPatrick Chase2013/08/26 08:04 AM
                                Could you provide a link?Paul A. Clayton2013/08/26 09:32 AM
                                  Could you provide a link?Patrick Chase2013/08/26 09:43 AM
                                    Thanks. I had a text copy without url.Paul A. Clayton2013/08/26 02:20 PM
                                      Thanks. I had a text copy without url.Patrick Chase2013/08/26 05:53 PM
                            How does Power compare to ARM / MIPS?anon2013/08/25 08:37 PM
                              How does Power compare to ARM / MIPS?David Kanter2013/08/26 01:31 PM
                              How does Power compare to ARM / MIPS?Patrick Chase2013/08/27 04:11 PM
                                I think even later P4s used width pipelining (NT)Paul A. Clayton2013/08/27 05:20 PM
    How does Power compare to ARM / MIPS?Vincent Diepeveen2013/08/26 04:04 AM
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