Separate instruction and data registers BAD or NOT, m68k

By: Brett (ggtgp.delete@this.yahoo.com), August 30, 2013 6:42 pm
Room: Moderated Discussions
Linus Torvalds (torvalds.delete@this.linux-foundation.org) on August 30, 2013 4:13 pm wrote:
> Max (max.delete@this.a.com) on August 30, 2013 1:12 pm wrote:
> >
> > You allocate pointers to address registers and everything else to data registers.
>
> That's BS - pointers *are* data, and often a large portion of arithmetic is for
> addresses. That's kind of the problem with the whole stupid Ax/Dx separation.
>
> Because quite often address calculations are done just for the *address*, and the pointer in never
> actually dereferenced by the code in question. Yes, it's an "address", but at the same time, it's
> purely about integer arithmetic, and it may well be better to use a data register for it.
>
> See? There's a fundamental core ambiguity about addresses. They really may be just plain arithmetic
> data, and most compilers tend to actually treat them that way except for the final dereference.
>
> So separating addresses vs integer data is a bad idea, in a way that few other separations are not.

The primary reason for separate instruction and data registers is better code density for the number of registers used. The m68k was used in new computers where 64k of RAM was not enough and so you needed 32 bit addressing, but you often had barely more than that. minor hassles for occasional copies between A/D sets are irrelevant whining.

High end (all?) m68k designs used a unified register set internally, and like the x86 register copies can be taken care of by the front end and are "free".

For a truly high end system the split register files are a bonus, the Alpha CPU tried splitting odd and even registers to separate register file ALU blocks for higher performance. Something we will see again, probably in the Mill CPU since they want to issue 33 operations a cycle.

Anyone designing a fresh from scratch high end CPU today would be thinking of adding multiple bits to instructions to signify register bank use. Take ARM like instructions and reuse 2 bits of the useless predication part of the instruction to give you 4 register banks of 16 registers.

The compiler might only to be able to use addressing from one or two banks, which would make hardware simpler. But false fear of m68k concerns might force the hardware guys to support loads and stores from all 4 register sets.

To make things really regular you can add vector Int/FPU units to each of the four register sets. Then if you are IBM add an option to split the register files and run separate code on each of the four register files.

A BIG-little approach that gets sales into more markets. Similar to IBM allowing you to down configure the 8 POWER hardware threads all the way down to 1 to run bloated code that does not like sharing resources, verses lots of weak threads that block and use few resources.

> So the whole A/D separation was just nasty. I don't think it had anything to do with the
> failure of the architecture, but I can easily see it being annoying to a compiler writer,
> where you have two classes of registers that are so similar yet so different.
>
> Linus

The ultimate failure after decades of success for the m68k series in embedded systems had to do with all the address modes and legacy code that used them. Which made cheap high end embedded m68k CPU's too hard and expensive to implement for the performance gained. Not A/D separation.
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      How does Power compare to ARM / MIPS?Mark Roulo2013/08/13 10:11 AM
        How does Power compare to ARM / MIPS?none2013/08/13 10:22 AM
          How does Power compare to ARM / MIPS?none2013/08/13 10:23 AM
        How does Power compare to ARM / MIPS?EduardoS2013/08/13 11:42 AM
          How does Power compare to ARM / MIPS?Exophase2013/08/13 12:27 PM
            How does Power compare to ARM / MIPS?Patrick Chase2013/08/15 12:17 PM
              How does Power compare to ARM / MIPS?David Hess2013/08/15 02:38 PM
                How does Power compare to ARM / MIPS?Mark Roulo2013/08/15 03:31 PM
                  How does Power compare to ARM / MIPS?EduardoS2013/08/15 08:45 PM
                    How does Power compare to ARM / MIPS?Patrick Chase2013/08/15 08:54 PM
                      How does Power compare to ARM / MIPS?EduardoS2013/08/15 09:21 PM
                How does Power compare to ARM / MIPS?Patrick Chase2013/08/15 07:47 PM
              How does Power compare to ARM / MIPS?Exophase2013/08/15 07:56 PM
                How does Power compare to ARM / MIPS?Patrick Chase2013/08/15 08:41 PM
        Server and Embedded "environments" are still distinguishedPaul A. Clayton2013/08/13 06:31 PM
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        How does Power compare to ARM / MIPS?Brett2013/08/14 08:17 PM
          How does Power compare to ARM / MIPS?anon2013/08/15 12:13 AM
            How does Power compare to ARM / MIPS?David Kanter2013/08/15 01:23 AM
              How does Power compare to ARM / MIPS?anon2013/08/15 03:51 AM
                How does Power compare to ARM / MIPS?someone2013/08/15 11:46 AM
          How does Power compare to ARM / MIPS?none2013/08/15 03:47 AM
          How does Power compare to ARM / MIPS?Doug S2013/08/15 09:46 AM
            How does Power compare to ARM / MIPS?David Kanter2013/08/15 12:48 PM
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                Initial 64-bit ARM *can* run older 32-bit ARM codeRonald Maas2013/08/19 09:19 PM
                  Initial 64-bit ARM *can* run older 32-bit ARM codeanon2013/08/20 01:58 AM
                    Initial 64-bit ARM *can* run older 32-bit ARM codeLinus Torvalds2013/08/20 10:58 AM
                      Initial 64-bit ARM *can* run older 32-bit ARM codeRicardo B2013/08/20 03:27 PM
                        Initial 64-bit ARM *can* run older 32-bit ARM coderwessel2013/08/20 04:04 PM
                        Initial 64-bit ARM *can* run older 32-bit ARM codeLinus Torvalds2013/08/20 04:05 PM
                          Initial 64-bit ARM *can* run older 32-bit ARM codeMichael S2013/08/20 04:54 PM
                            Initial 64-bit ARM *can* run older 32-bit ARM codeLinus Torvalds2013/08/20 05:09 PM
                          Initial 64-bit ARM *can* run older 32-bit ARM codeTREZA2013/08/21 06:06 AM
                            Initial 64-bit ARM *can* run older 32-bit ARM codeLinus Torvalds2013/08/21 09:50 AM
                              Initial 64-bit ARM *can* run older 32-bit ARM codeTREZA2013/08/21 12:39 PM
                          Initial 64-bit ARM *can* run older 32-bit ARM codeRicardo B2013/08/22 05:25 AM
                            Initial 64-bit ARM *can* run older 32-bit ARM codeEduardoS2013/08/22 06:59 AM
                              Initial 64-bit ARM *can* run older 32-bit ARM codeRicardo B2013/08/22 07:28 AM
                                Initial 64-bit ARM *can* run older 32-bit ARM codeEduardoS2013/08/22 08:36 AM
                                  Initial 64-bit ARM *can* run older 32-bit ARM codeRicardo B2013/08/22 09:21 AM
                                    Initial 64-bit ARM *can* run older 32-bit ARM codeEduardoS2013/08/22 10:02 AM
                        Initial 64-bit ARM *can* run older 32-bit ARM codeGabriele Svelto2013/08/21 03:26 AM
                          Initial 64-bit ARM *can* run older 32-bit ARM codeRicardo B2013/08/22 05:43 AM
                            Initial 64-bit ARM *can* run older 32-bit ARM codeRicardo B2013/08/22 05:47 AM
                        Initial 64-bit ARM *can* run older 32-bit ARM codeDan Fay2013/08/21 01:13 PM
                          Initial 64-bit ARM *can* run older 32-bit ARM codeDavid Hess2013/08/22 10:55 AM
                            Initial 64-bit ARM *can* run older 32-bit ARM codegallier22013/08/22 12:35 PM
                              Initial 64-bit ARM *can* run older 32-bit ARM codeDavid Hess2013/08/22 01:26 PM
                      Initial 64-bit ARM *can* run older 32-bit ARM codeRonald Maas2013/08/20 05:38 PM
                      Initial 64-bit ARM *can* run older 32-bit ARM codeanon2013/08/20 06:07 PM
                        Initial 64-bit ARM *can* run older 32-bit ARM codeMichael S2013/08/21 05:15 AM
                          Initial 64-bit ARM *can* run older 32-bit ARM codeanon2013/08/21 06:01 AM
                      An elaborate theory of why AMD64 succeeded2013/08/20 11:29 PM
                        An elaborate theory of why AMD64 succeededanon2013/08/21 02:09 AM
                          An elaborate theory of why AMD64 succeeded2013/08/21 04:12 AM
                            An elaborate theory of why AMD64 succeededbakaneko2013/08/21 04:39 AM
                              An elaborate theory of why AMD64 succeeded2013/08/21 05:20 AM
                                An elaborate theory of why AMD64 succeededbakaneko2013/08/21 05:41 AM
                                  An elaborate theory of why AMD64 succeeded2013/08/21 06:47 AM
                                    An elaborate theory of why AMD64 succeededbakaneko2013/08/21 07:26 AM
                            An elaborate theory of why AMD64 succeededanon2013/08/21 05:40 AM
                              An elaborate theory of why AMD64 succeeded2013/08/21 06:47 AM
                                Mod? (NT)anon2013/08/21 07:28 AM
                                  An elaborate theory of why AMD64 succeeded2013/08/21 08:34 AM
                                    An elaborate theory of why AMD64 succeededanon2013/08/21 09:04 AM
                                OK, let's try and keep this productiveDavid Kanter2013/08/21 01:27 PM
                                  OK, let's try and keep this productivePatrick Chase2013/08/21 11:42 PM
                                    OK, let's try and keep this productiveGabriele Svelto2013/08/22 02:48 AM
                                    OK, let's try and keep this productivePatrick Chase2013/08/22 09:03 AM
                                  OK, let's try and keep this productiveanon2013/08/22 12:47 AM
                            An elaborate theory of why AMD64 succeededCarlie Coats2013/08/21 06:31 AM
                              An elaborate theory of why AMD64 succeeded2013/08/21 06:59 AM
                              An elaborate theory of why AMD64 succeededMichael S2013/08/21 07:15 AM
                                An elaborate theory of why AMD64 succeededCarlie Coats2013/08/21 12:25 PM
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                                  An elaborate theory of why AMD64 succeededrwessel2013/08/21 01:53 PM
                                  An elaborate theory of why AMD64 succeededMichael S2013/08/21 02:13 PM
                                  An elaborate theory of why AMD64 succeededBrett2013/08/21 06:25 PM
                                    An elaborate theory of why AMD64 succeededCarlie Coats2013/08/22 04:36 AM
                            An elaborate theory of why AMD64 succeededanon2013/08/21 06:46 AM
                              An elaborate theory of why AMD64 succeeded2013/08/21 07:07 AM
                                An elaborate theory of why AMD64 succeededanon2013/08/21 07:27 AM
                            An elaborate theory of why AMD64 succeededVincent Diepeveen2013/08/31 02:24 AM
                          An elaborate theory of why AMD64 succeededCarlie Coats2013/08/21 06:24 AM
                            An elaborate theory of why AMD64 succeededMichael S2013/08/21 07:03 AM
                              An elaborate theory of why AMD64 succeededCarlie Coats2013/08/21 12:27 PM
                        An elaborate theory of why AMD64 succeededStubabe2013/08/21 09:43 AM
                          An elaborate theory of why AMD64 succeededMichael S2013/08/21 10:02 AM
                            An elaborate theory of why AMD64 succeededStubabe2013/08/21 10:37 AM
                              An elaborate theory of why AMD64 succeededKlimax2013/08/21 11:09 AM
                                An elaborate theory of why AMD64 succeededStubabe2013/08/21 04:27 PM
                            An elaborate theory of why AMD64 succeededLinus Torvalds2013/08/21 10:40 AM
                              An elaborate theory of why AMD64 succeededYuhong Bao2013/08/22 01:11 AM
                                An elaborate theory of why AMD64 succeededEduardoS2013/08/22 03:25 AM
                                  An elaborate theory of why AMD64 succeedednone2013/08/22 04:29 AM
                                  An elaborate theory of why AMD64 succeededRicardo B2013/08/22 06:06 AM
                            An elaborate theory of why AMD64 succeededEduardoS2013/08/21 11:58 AM
                            An elaborate theory of why AMD64 succeededanon2013/08/22 01:25 AM
                              An elaborate theory of why AMD64 succeededEduardoS2013/08/22 03:29 AM
                          An elaborate theory of why AMD64 succeededSymmetry2013/08/21 10:51 AM
                            An elaborate theory of why AMD64 succeededStubabe2013/08/21 04:22 PM
                        An elaborate theory of why AMD64 succeededDan Fay2013/08/21 01:43 PM
                        No elaborate theories requiredDoug S2013/08/21 05:18 PM
                          No elaborate theories requiredGabriele Svelto2013/08/22 05:28 AM
                            No elaborate theories requiredDoug S2013/08/22 10:03 AM
                          No elaborate theories requiredDavid Hess2013/08/22 02:38 PM
                            No elaborate theories requiredDoug S2013/08/22 03:30 PM
                              No elaborate theories requiredDavid Hess2013/08/23 09:42 AM
                                No elaborate theories requiredanon2013/08/24 02:09 AM
                                  No elaborate theories requiredDavid Hess2013/08/24 05:36 PM
                        An very bad theory of why AMD64 succeededEric Bron2013/08/23 02:50 AM
                          An very bad theory of why AMD64 succeededEduardoS2013/08/23 04:36 AM
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                        How about dropping x87?Michael S2013/08/21 11:01 AM
                          How about dropping x87?David Kanter2013/08/21 01:34 PM
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                          Initial 64-bit ARM *can* run older 32-bit ARM codeRonald Maas2013/08/21 12:38 PM
                            Initial 64-bit ARM *can* run older 32-bit ARM codebakaneko2013/08/21 01:17 PM
                            Initial 64-bit ARM *can* run older 32-bit ARM codeMichael S2013/08/21 02:30 PM
                            Initial 64-bit ARM *can* run older 32-bit ARM codemas2013/08/21 06:10 PM
                              Initial 64-bit ARM *can* run older 32-bit ARM codenone2013/08/21 08:25 PM
                                Initial 64-bit ARM *can* run older 32-bit ARM codemas2013/08/22 01:19 AM
                                  Initial 64-bit ARM *can* run older 32-bit ARM codeanon2013/08/22 01:53 AM
                                    Initial 64-bit ARM *can* run older 32-bit ARM codemas2013/08/22 02:07 AM
                                      Initial 64-bit ARM *can* run older 32-bit ARM codemas2013/08/22 02:11 AM
                                        Initial 64-bit ARM *can* run older 32-bit ARM codenone2013/08/22 02:30 AM
                                          Initial 64-bit ARM *can* run older 32-bit ARM codemas2013/08/22 03:34 AM
                                            Initial 64-bit ARM *can* run older 32-bit ARM codenone2013/08/22 06:04 AM
                                              Initial 64-bit ARM *can* run older 32-bit ARM codemas2013/08/22 07:56 AM
                                  Initial 64-bit ARM *can* run older 32-bit ARM codenone2013/08/22 02:09 AM
                                    Initial 64-bit ARM *can* run older 32-bit ARM codemas2013/08/22 02:26 AM
                                      Initial 64-bit ARM *can* run older 32-bit ARM codenone2013/08/22 02:38 AM
                                        Initial 64-bit ARM *can* run older 32-bit ARM codemas2013/08/22 02:52 AM
                                          Initial 64-bit ARM *can* run older 32-bit ARM codenone2013/08/22 03:13 AM
                                  Initial 64-bit ARM *can* run older 32-bit ARM coderwessel2013/08/22 01:06 PM
                                    Initial 64-bit ARM *can* run older 32-bit ARM codemas2013/08/22 01:42 PM
                                      Initial 64-bit ARM *can* run older 32-bit ARM coderwessel2013/08/22 07:06 PM
                                        Initial 64-bit ARM *can* run older 32-bit ARM codeMichael S2013/08/23 04:53 AM
                                          Initial 64-bit ARM *can* run older 32-bit ARM coderwessel2013/08/23 09:14 PM
                                        Initial 64-bit ARM *can* run older 32-bit ARM codeTREZA2013/08/23 12:53 PM
                                    Initial 64-bit ARM *can* run older 32-bit ARM codeMichael S2013/08/22 02:15 PM
                                      Initial 64-bit ARM *can* run older 32-bit ARM coderwessel2013/08/22 07:10 PM
                                        Initial 64-bit ARM *can* run older 32-bit ARM codeMichael S2013/08/23 04:38 AM
                                        Initial 64-bit ARM *can* run older 32-bit ARM codeEugene Nalimov2013/08/23 01:00 PM
                                          Initial 64-bit ARM *can* run older 32-bit ARM codeanon2013/08/24 02:11 AM
                                            Initial 64-bit ARM *can* run older 32-bit ARM codeEugene Nalimov2013/08/26 02:35 PM
                                          Initial 64-bit ARM *can* run older 32-bit ARM codevvid2013/08/28 09:36 AM
                                            Initial 64-bit ARM *can* run older 32-bit ARM codeEugene Nalimov2013/08/29 09:51 AM
                                              Initial 64-bit ARM *can* run older 32-bit ARM codeMax2013/08/30 01:12 PM
                                                Initial 64-bit ARM *can* run older 32-bit ARM codeLinus Torvalds2013/08/30 04:13 PM
                                                  Separate instruction and data registers BAD or NOT, m68kBrett2013/08/30 06:42 PM
                                                    Separate instruction and data registers BAD or NOT, m68kanon2013/08/30 07:29 PM
                                                      Trade-offs are not constantPaul A. Clayton2013/08/31 10:33 AM
                                                      Separate instruction and data registers BAD or NOT, m68kMichael S2013/08/31 11:42 AM
                                                      Separate instruction and data registers BAD or NOT, m68kBrett2013/08/31 02:51 PM
                                                    Separate instruction and data registers BAD or NOT, m68ksomeone2013/08/30 11:15 PM
                                                      Separate instruction and data registers BAD or NOT, m68kBrett2013/08/31 02:54 PM
                                                      Separate instruction and data registers BAD or NOT, m68kBrett2013/08/31 03:08 PM
                                                        Separate instruction and data registers BAD or NOT, m68kanon2013/08/31 07:43 PM
                                                          Separate instruction and data registers BAD or NOT, m68kMichael S2013/09/01 01:07 AM
                                                            Partitioned register sets BAD or NOTBrett2013/09/01 02:03 AM
                                                              Partitioned register sets BAD or NOTPatrick Chase2013/09/01 10:38 AM
                                                                Embedded VLIWPaul A. Clayton2013/09/01 12:54 PM
                                                                  Embedded VLIWPatrick Chase2013/09/01 03:14 PM
                                                                    Thanks for the additional info (NT)Paul A. Clayton2013/09/01 08:54 PM
                                                                Partitioned register sets BAD or NOTPatrick Chase2013/09/02 12:06 AM
                                                                Stop bitsBrett2013/09/02 02:24 PM
                                                                  Stop bitsPatrick Chase2013/09/02 03:00 PM
                                                            Separate instruction and data registers BAD or NOT, m68kanon2013/09/01 10:12 AM
                                                    Separate instruction and data registers BAD or NOT, m68kRichardC2013/08/31 06:03 AM
                                                    Separate instruction and data registers BAD or NOT, m68kMegol2013/09/04 07:04 AM
                                                      Separate instruction and data registers BAD or NOT, m68kBrett2013/09/04 11:27 PM
                                                        Separate instruction and data registers BAD or NOT, m68kMegol2013/09/05 07:32 AM
                                                          Separate instruction and data registers BAD or NOT, m68kgallier22013/09/05 09:37 AM
                                                            Separate instruction and data registers BAD or NOT, m68kMegol2013/09/05 10:48 AM
                                                          Separate instruction and data registers BAD or NOT, m68kJouni Osmala2013/09/05 11:18 AM
                                                            Separate instruction and data registers BAD or NOT, m68kMegol2013/09/06 05:17 AM
                                                            John Mashey post is sorta relevant ...Mark Roulo2013/09/06 09:30 AM
                                                              John Mashey post is sorta relevant ...Megol2013/09/06 11:59 AM
                                                                John Mashey post is sorta relevant ...Brett2013/09/06 06:32 PM
                                                                  John Mashey post is sorta relevant ...Eugene Nalimov2013/09/08 11:10 AM
                                                                    John Mashey post is sorta relevant ...Brett2013/09/08 02:54 PM
                                                                      John Mashey post is sorta relevant ...David Kanter2013/09/08 05:06 PM
                                                                        John Mashey post is sorta relevant ...Brett2013/09/08 07:48 PM
                                                                          John Mashey post is sorta relevant ...Jouni Osmala2013/09/09 06:26 AM
                                                                            John Mashey post is sorta relevant ...Brett2013/09/13 04:51 PM
                                                                              John Mashey post is sorta relevant ...Megol2013/09/14 09:56 AM
                                                                      John Mashey post is sorta relevant ...Eugene Nalimov2013/09/08 06:59 PM
                                                                        John Mashey post is sorta relevant ...Brett2013/09/08 07:55 PM
                                                                        Renesas RX vs x86/68K/VAXMichael S2013/09/09 06:15 AM
                                                  Initial 64-bit ARM *can* run older 32-bit ARM codeEduardoS2013/08/31 11:09 AM
                                                    Initial 64-bit ARM *can* run older 32-bit ARM codeLinus Torvalds2013/08/31 11:34 AM
                                                      Initial 64-bit ARM *can* run older 32-bit ARM codeEduardoS2013/08/31 12:26 PM
                                                        Initial 64-bit ARM *can* run older 32-bit ARM codeLinus Torvalds2013/08/31 02:12 PM
                                                          Initial 64-bit ARM *can* run older 32-bit ARM codeEduardoS2013/08/31 03:49 PM
                                                    Initial 64-bit ARM *can* run older 32-bit ARM codegallier22013/08/31 12:15 PM
                              Initial 64-bit ARM *can* run older 32-bit ARM codeRonald Maas2013/08/21 11:54 PM
                                Initial 64-bit ARM *can* run older 32-bit ARM codemas2013/08/22 01:10 AM
                                Initial 64-bit ARM *can* run older 32-bit ARM codeMichael S2013/08/22 02:47 AM
                                  Initial 64-bit ARM *can* run older 32-bit ARM codemas2013/08/22 03:17 AM
                              Initial 64-bit ARM *can* run older 32-bit ARM codeGabriele Svelto2013/08/22 07:53 AM
                      Initial 64-bit ARM *can* run older 32-bit ARM codeMr. Camel2013/08/23 06:33 AM
                        Initial 64-bit ARM *can* run older 32-bit ARM codeMichael S2013/08/23 07:03 AM
                        Initial 64-bit ARM *can* run older 32-bit ARM codeEduardoS2013/08/23 07:39 AM
                          Initial 64-bit ARM *can* run older 32-bit ARM codeRonald Maas2013/08/23 10:13 AM
                            Initial 64-bit ARM *can* run older 32-bit ARM codeEduardoS2013/08/23 10:28 AM
                        Initial 64-bit ARM *can* run older 32-bit ARM coderwessel2013/08/23 10:14 PM
              How does Power compare to ARM / MIPS?EduardoS2013/08/15 08:35 PM
                How does Power compare to ARM / MIPS?Carlie Coats2013/08/21 12:31 PM
              Mixing 32b and 64b code in a kernelDoug S2013/08/16 09:50 AM
                LPAE is here now!Mark Roulo2013/08/16 10:45 AM
                  LPAE is here now!Patrick Chase2013/08/16 12:29 PM
                    LPAE is here now!anon2013/08/16 06:11 PM
                Mixing 32b and 64b code in a kernelRicardo B2013/08/17 10:52 AM
                  Mixing 32b and 64b code in a kernelLinus Torvalds2013/08/17 11:09 AM
                    Mixing 32b and 64b code in a kernelMax2013/08/18 02:57 PM
                Mixing 32b and 64b code in a kernelCarlie Coats2013/08/21 12:46 PM
            How does Power compare to ARM / MIPS?Ungo2013/08/15 12:59 PM
              How does Power compare to ARM / MIPS?Doug S2013/08/15 07:39 PM
                How does Power compare to ARM / MIPS?Patrick Chase2013/08/15 08:04 PM
                  How does Power compare to ARM / MIPS?Patrick Chase2013/08/15 09:01 PM
                How does Power compare to ARM / MIPS?Jukka Larja2013/08/16 06:54 AM
          How does Power compare to ARM / MIPS?Patrick Chase2013/08/15 07:29 PM
            How does Power compare to ARM / MIPS?Brett2013/08/16 11:34 PM
              How does Power compare to ARM / MIPS?Doug S2013/08/17 11:18 AM
                How does Power compare to ARM / MIPS?Brett2013/08/17 11:35 AM
                  16 vs 32 general purpose registersMark Roulo2013/08/17 11:40 AM
                    16 vs 32 general purpose registersMichael S2013/08/17 02:55 PM
                      16 vs 32 general purpose registersPatrick Chase2013/08/18 04:55 AM
                  How does Power compare to ARM / MIPS?EduardoS2013/08/17 05:30 PM
                How does Power compare to ARM / MIPS?Patrick Chase2013/08/17 12:49 PM
                  > 32 general purpose registersMark Roulo2013/08/17 01:58 PM
                    > 32 general purpose registersMichael S2013/08/17 02:25 PM
                    > 32 general purpose registersPatrick Chase2013/08/17 03:11 PM
                      > 32 general purpose registersExophase2013/08/18 10:17 AM
                        IIRC, AArch32 registers (shadow registers et al.) map onto AArch64 registers (NT)Paul A. Clayton2013/08/18 02:51 PM
                          IIRC, AArch32 registers (shadow registers et al.) map onto AArch64 registersExophase2013/08/18 09:28 PM
                            IIRC, AArch32 registers (shadow registers et al.) map onto AArch64 registersMichael S2013/08/19 02:17 AM
                              IIRC, AArch32 registers (shadow registers et al.) map onto AArch64 registersExophase2013/08/19 08:42 AM
                    > 32 general purpose registersDoug S2013/08/18 12:21 AM
        How does Power compare to ARM / MIPS?Brett2013/08/17 11:20 AM
          How does Power compare to ARM / MIPS?Gabriele Svelto2013/08/18 02:12 PM
            How does Power compare to ARM / MIPS?Exophase2013/08/18 09:35 PM
          How does Power compare to ARM / MIPS?mas2013/08/20 03:29 PM
      How does Power compare to ARM / MIPS?mas2013/08/20 03:15 PM
        How does Power compare to ARM / MIPS?none2013/08/20 03:31 PM
          How does Power compare to ARM / MIPS?mas2013/08/20 04:08 PM
        How does Power compare to ARM / MIPS?Linus Torvalds2013/08/20 03:49 PM
          How does Power compare to ARM / MIPS?mas2013/08/20 05:53 PM
            How does Power compare to ARM / MIPS?Linus Torvalds2013/08/20 07:52 PM
              How does Power compare to ARM / MIPS?mas2013/08/21 12:21 AM
                How does Power compare to ARM / MIPS?Michael S2013/08/21 06:17 AM
                  How does Power compare to ARM / MIPS?mas2013/08/21 07:05 AM
                    How does Power compare to ARM / MIPS?Michael S2013/08/21 07:27 AM
                      How does Power compare to ARM / MIPS?none2013/08/21 07:53 AM
                        How does Power compare to ARM / MIPS?Michael S2013/08/21 08:02 AM
                          XScale wasn't synthesizablePatrick Chase2013/08/21 12:36 PM
                            XScale wasn't synthesizableMichael S2013/08/21 02:00 PM
                              XScale wasn't synthesizablePatrick Chase2013/08/21 03:02 PM
                              XScale wasn't synthesizablePatrick Chase2013/08/21 03:11 PM
                      How does Power compare to ARM / MIPS?mas2013/08/21 08:45 AM
                  How does Power compare to ARM / MIPS?mas2013/08/22 04:08 AM
            How does Power compare to ARM / MIPS?Doug S2013/08/20 10:47 PM
              How does Power compare to ARM / MIPS?Michael S2013/08/21 07:32 AM
              How does Power compare to ARM / MIPS?Patrick Chase2013/08/21 08:37 AM
              How does Power compare to ARM / MIPS?Patrick Chase2013/08/21 11:45 AM
                How does Power compare to ARM / MIPS?EduardoS2013/08/21 12:02 PM
                  How does Power compare to ARM / MIPS?Patrick Chase2013/08/21 12:27 PM
                    How does Power compare to ARM / MIPS?Patrick Chase2013/08/21 12:47 PM
                      Is simplistic prediction still prediction?Paul A. Clayton2013/08/21 03:59 PM
                        Is simplistic prediction still prediction?Patrick Chase2013/08/22 12:16 PM
                          More like always not-taken, but yeah lame prediction (NT)Paul A. Clayton2013/08/22 01:27 PM
                      How does Power compare to ARM / MIPS?Linus Torvalds2013/08/21 04:25 PM
                        Athlon did something similar (but no dirty special case)Paul A. Clayton2013/08/21 07:47 PM
                          Athlon did something similar (but no dirty special case)Patrick Chase2013/08/22 12:13 PM
                        How does Power compare to ARM / MIPS?Patrick Chase2013/08/22 11:56 AM
                        How does Power compare to ARM / MIPS?Patrick Chase2013/08/22 12:29 PM
                          How does Power compare to ARM / MIPS?Linus Torvalds2013/08/22 01:40 PM
                    How does Power compare to ARM / MIPS?anon2013/08/22 12:45 AM
                      How does Power compare to ARM / MIPS?Niels Jørgen Kruse2013/08/22 02:38 AM
                        How does Power compare to ARM / MIPS?Michael S2013/08/22 02:58 AM
                      How does Power compare to ARM / MIPS?Patrick Chase2013/08/22 08:44 AM
                        Are you sure P4 used IP-based way prediction?Paul A. Clayton2013/08/22 02:04 PM
                          Are you sure P4 used IP-based way prediction?Patrick Chase2013/08/22 03:40 PM
                        How does Power compare to ARM / MIPS?Patrick Chase2013/08/24 10:19 AM
                          How does Power compare to ARM / MIPS?Anon2013/08/25 01:15 AM
                            How does Power compare to ARM / MIPS?Patrick Chase2013/08/25 07:49 PM
                              Replay tornadoes? Paul A. Clayton2013/08/25 08:43 PM
                        How does Power compare to ARM / MIPS?anon2013/08/25 04:22 PM
                          How does Power compare to ARM / MIPS?anonymou52013/08/25 04:35 PM
                            I have the date and topic for a P4 Dcache postPaul A. Clayton2013/08/25 08:34 PM
                              Obviously that should have been "anonymous (no@spam.com)" (NT)Paul A. Clayton2013/08/25 08:45 PM
                              I have the date and topic for a P4 Dcache postPatrick Chase2013/08/26 09:04 AM
                                Could you provide a link?Paul A. Clayton2013/08/26 10:32 AM
                                  Could you provide a link?Patrick Chase2013/08/26 10:43 AM
                                    Thanks. I had a text copy without url.Paul A. Clayton2013/08/26 03:20 PM
                                      Thanks. I had a text copy without url.Patrick Chase2013/08/26 06:53 PM
                            How does Power compare to ARM / MIPS?anon2013/08/25 09:37 PM
                              How does Power compare to ARM / MIPS?David Kanter2013/08/26 02:31 PM
                              How does Power compare to ARM / MIPS?Patrick Chase2013/08/27 05:11 PM
                                I think even later P4s used width pipelining (NT)Paul A. Clayton2013/08/27 06:20 PM
    How does Power compare to ARM / MIPS?Vincent Diepeveen2013/08/26 05:04 AM
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