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

By: Linus Torvalds (torvalds.delete@this.linux-foundation.org), August 20, 2013 7:15 pm
Room: Moderated Discussions
Ronald Maas (rmaas.delete@this.wiwo.nl) on August 20, 2013 5:42 pm wrote:
> Linus Torvalds (torvalds.delete@this.linux-foundation.org) on August 20, 2013 10:58 am wrote:
> >
> > Let's see how ARM64 goes in comparison.
>
> I expact that the vast majority of upcoming ARMv8 implementations will implement both Aarch32 and Aarch64.
> For the pretty much the same reasons why AMD had to choose to support legacy 16/32 bit code - to protect
> investments in existing legacy code base which may take a while to be phase out completely.

You missed the other part of the equation: there needs to be no downside to upgrading. Which was how x86-64 got a toe in the market: it didn't just support legacy mode, it did so with no downsides. AMD did the top chip at the time even for legacy mode applications.

And that is not at all clearly the case for ARMv8. We'll have to see.

So ARMv8 needs to at least match the best ARMv7 chips even on legacy code, which sounds unlikely. And part of the reason I say "unlikely" is that in the segment ARM competes, power use is a big deal.

And if ARMv8 implementations don't do that, then why would people pick it? For microservers that need 64-bit, and don't care about legacy, yes. But then it needs to compete against x86 in that market, and it's not all that clear that it can. The power story in that market was always a bit shaky to begin with, and Intel is shoring up.

The bigger market is obviously mobile, and there the question is whether ARMv8 is power-competitive and whether 64-bit is a sufficient advantage. In a few years, I suspect 64 bits will start to be an issue even in mobile (PAE gets to be painful), but with the power story, it's at the same time a bit harder to make the kind of argument AMD did with x86-64.

And maybe ARMv8 has other advantages. We'll see. I just don't think it's necessarily clear-cut.

And btw, don't get me wrong. Go back and search the archives of this very board several years ago when I was arguing against Itanium. I made it very clear back then that I thought the only way to overtake x86 is to come from below, not do what Itanium (and all the other traditional RISCs did), and said that I thought ARM was the best chance of dethroning x86.

I still believe that, but at the same time I don't buy into the crazy people who think it's going to be easy or obvious, or who think that ARM is somehow inherently the better architecture. Because that's just BS.

The advantage ARM has - and the only advantage it ever had - is exactly the same advantage that x86 had: a lower-end market growing up. Because in the end it's not about technology, it's about the market forces. But you have to balance that advantage against the disadvantage of competing against Intel. That's a pretty damn big market force too.

Linus
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    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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