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

By: Linus Torvalds (torvalds.delete@this.linux-foundation.org), August 20, 2013 9:58 am
Room: Moderated Discussions
anon (anon.delete@this.anon.com) on August 20, 2013 1:58 am wrote:
>
> I always wondered why AMD did try this with their 64-bit move. I can see Intel of that era wanting
> to keep cost and complexity of implementing x86 high, but it made less sense for AMD.

No it didn't.

The reason x86-64 was so successful was *exactly* that AMD did things right, and legacy x86 wasn't some separate thing, but is very much baked into x86-64. There is no "either or": x86-64 was designed pretty much from the ground up to be an extension, not a "separate mode". It's pretty much seamless.

Yes, yes, "long mode" is a new mode bit, but at the same time you can see how it's really using the same instruction decode logic, the same execution units, etc etc. It's not two different front-ends, it's clearly one unified architecture.

Yes, you could drop some legacy x86 stuff, but you can tell how integrated x86-64 is by simply noting that the stuff you'd drop is actually totally independent of the new long mode. It's basically the same thing you might want to drop even if you never did long mode at all. The things you'd likely want to drop are the old 16-bit modes, and some of the worst excesses dragged in by the i286 in particular. But it may never happen, because it just isn't painful enough.

And I really think that the whole "seamless integration" was the right thing to do. It meant that there was never even a whiff of the ia64 "legacy engine" kind of engineering tradeoff where one mode or the other was considered "more important". Intel obviously did that to the extreme (with a very slow and bad legacy mode), and AMD couldn't possibly have done that - but the integral nature of x86-64 meant that AMD also couldn't do the reverse mistake (to make legacy mode more important, which would have made x86-64 dead in the water since there were no new apps taking advantage of the 64-bit extensions).

So I think it was the right thing to do from a hardware perspective - it made it clear that the new long mode was as important as the old 32-bit protected mode. There was no room for anything else.

It was also the right thing to do from a software perspective, because it meant that any traditional x86 knowledge really translated pretty much directly into knowing the new mode. Sure, there are differences (new registers, natch) and things that are no longer relevant in 64-bit mode (the segments kind of survived, but in a much weaker form, and vm86 mode is gone). But it's still overwhelmingly familiar.

That helps compiler writers, and it helps developers. It actually makes sense for a compiler person to think of x86 as one unified platform, and then just have a flag for the differences. And if you used a debugger on x86-32, it is all going to be very very familiar in 64-bit mode.

In other words, it made the transition much simpler for everybody. It was a no-brainer to buy an Athlon even before you had 64-bit apps regardless of whether you were a developer or just a regular user, because there were basically no downsides, and it opened up some possibilities. Very much *unlike* most other architecture upgrades in the history of basically forever.

I'd say that anybody who claims that x86-64 could have been done better is just completely clueless. Because it is about *so* much more than just introducing a new and improved execution mode.

Let's see how ARM64 goes in comparison.

Linus
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TopicPosted ByDate
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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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