Load delay slots need not be a problem

Article: Silvermont, Intel's Low Power Architecture
By: Paul A. Clayton (paaronclayton.delete@this.gmail.com), May 18, 2013 5:41 am
Room: Moderated Discussions
aaron spink (aaronspink.delete@this.notearthlink.net) on May 17, 2013 8:55 pm wrote:
[snip]
> Eh? Those weren't the flaws of the early RISC ISAs. Most of the flaws of the early RISC ISAs was exposing fundamental
> micro-architectural details into the ISA. Examples included branch delay slots (MIPS, SPARC, PA-RISC) and load
> delay slots (MIPS). And personally I would probably add rotating register-files to the list.

As long as the delay slot instruction did not use the register being written by the load, dropping this feature would still provide binary compatibility. I do not know if such non-use was urged by the original MIPS documents, but I received the impression that such use was at least primarily found in code testing that behavior (i.e., not generated by compilers). I think it was even the case that such delay behavior was unreliable, that a cache miss would generate the interlock (I thinks such was mentioned in an comp.arch post at some point).

While this "software should not" method could also be applied to using the undefined most significant bits of addresses for additional storage (I seem to recall that the M68k did this--told developers not to use but did not generate exceptions if the bits were used--and reaped the consequences), I suspect that for delayed load in a 31-register ISA the incentive to use the load's target register as an operand source for the delay slot instruction would be very small, especially if (as might have been the case) one had to assume a cache hit and no interrupts (that would make using the load target register in the delay slot an extremely funky optimization--worse than using ordinary load/store for an [interrupt] atomic RMW).

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          No out-of-order in FP cluster of silvermont?EduardoS2013/06/29 06:50 PM
            No out-of-order in FP cluster of silvermont?anon2013/06/29 09:15 PM
              No out-of-order in FP cluster of silvermont?EduardoS2013/06/29 09:31 PM
                No out-of-order in FP cluster of silvermont?anon2013/06/30 02:53 AM
                  No out-of-order in FP cluster of silvermont?EduardoS2013/06/30 05:24 AM
                    No out-of-order in FP cluster of silvermont?anon2013/06/30 10:41 AM
                      No out-of-order in FP cluster of silvermont?EduardoS2013/06/30 01:26 PM
                        No out-of-order in FP cluster of silvermont?anon2013/07/01 12:32 AM
                          No out-of-order in FP cluster of silvermont?EduardoS2013/07/01 05:40 PM
                            No out-of-order in FP cluster of silvermont?anon2013/07/01 06:44 PM
                            No out-of-order in FP cluster of silvermont?Michael S2013/07/02 05:40 AM
                              No out-of-order in FP cluster of silvermont?Exophase2013/07/02 09:03 AM
                              No out-of-order in FP cluster of silvermont?EduardoS2013/07/02 05:20 PM
                          No out-of-order in FP cluster of silvermont?Patrick Chase2013/07/02 09:25 AM
                      No out-of-order in FP cluster of silvermont?Etienne2013/07/02 04:36 AM
                        No out-of-order in FP cluster of silvermont?anon2013/07/02 07:13 AM
                          No out-of-order in FP cluster of silvermont?Patrick Chase2013/07/02 10:03 AM
                            No out-of-order in FP cluster of silvermont?anon2013/07/02 04:12 PM
                              No out-of-order in FP cluster of silvermont?Patrick Chase2013/07/02 04:43 PM
                                No out-of-order in FP cluster of silvermont?anon2013/07/02 05:47 PM
                                  No out-of-order in FP cluster of silvermont?Patrick Chase2013/07/02 07:36 PM
                                    No out-of-order in FP cluster of silvermont?anon2013/07/02 09:03 PM
                                      No out-of-order in FP cluster of silvermont?Symmetry2013/07/03 07:14 AM
                                        No out-of-order in FP cluster of silvermont?Patrick Chase2013/07/03 09:04 PM
                                          No out-of-order in FP cluster of silvermont?Patrick Chase2013/07/04 03:23 AM
                        No out-of-order in FP cluster of silvermont?Patrick Chase2013/07/02 10:01 AM
                          No out-of-order in FP cluster of silvermont?Etienne2013/07/03 03:26 AM
                            layer 2 cache behaviourEtienne2013/07/05 03:14 AM
                              layer 2 cache behaviourMichael S2013/07/05 06:41 AM
                                layer 2 cache behaviourEtienne2013/07/05 09:15 AM
                              layer 2 cache behaviourPatrick Chase2013/07/05 11:37 AM
                                layer 2 cache behaviourMichael S2013/07/06 10:57 AM
                                  layer 2 cache behaviourPatrick Chase2013/07/06 12:08 PM
                                    layer 2 cache behaviourPatrick Chase2013/07/06 12:19 PM
                                    layer 2 cache behaviourEtienne2013/07/08 03:10 AM
                                      layer 2 cache behaviourPatrick Chase2013/07/08 10:02 AM
                                  layer 2 cache behaviourPatrick Chase2013/07/06 02:15 PM
                                  layer 2 cache behaviourUngo2013/07/09 03:24 PM
                      No out-of-order in FP cluster of silvermont?Patrick Chase2013/07/02 08:43 AM
                  No out-of-order in FP cluster of silvermont?Patrick Chase2013/07/02 08:34 AM
                    No out-of-order in FP cluster of silvermont?anon2013/07/02 04:15 PM
            No out-of-order in FP cluster of silvermont?none2013/06/30 05:03 AM
              No out-of-order in FP cluster of silvermont?EduardoS2013/06/30 05:45 AM
                No out-of-order in FP cluster of silvermont?none2013/06/30 06:28 AM
                  No out-of-order in FP cluster of silvermont?EduardoS2013/06/30 01:27 PM
        No out-of-order in FP cluster of silvermont?x2013/06/30 03:54 AM
          No out-of-order in FP cluster of silvermont?Foo_2013/06/30 06:15 AM
        No out-of-order in FP cluster of silvermont?rwessel2013/06/30 10:11 PM
          No out-of-order in FP cluster of silvermont?Linus Torvalds2013/07/01 01:40 PM
            No out-of-order in FP cluster of silvermont?Patrick Chase2013/07/02 10:35 AM
              No out-of-order in FP cluster of silvermont?Linus Torvalds2013/07/02 11:18 AM
            FPU in integer codes2013/07/02 11:38 AM
              FPU in integer codesPatrick Chase2013/07/02 11:56 AM
              FPU in integer codesLinus Torvalds2013/07/02 12:12 PM
                FPU in integer codesPatrick Chase2013/07/02 12:34 PM
                  FPU in integer codesLinus Torvalds2013/07/02 01:55 PM
        No out-of-order in FP cluster of silvermont?2013/06/30 11:42 PM
          No out-of-order in FP cluster of silvermont?bakaneko2013/07/03 03:54 AM
        What about integer SIMD?Exophase2013/07/01 12:44 AM
          What about integer SIMD?anon2013/07/01 01:45 AM
            What about integer SIMD?Michael S2013/07/01 08:57 AM
              What about integer SIMD?rwessel2013/07/01 03:39 PM
                What about integer SIMD?Michael S2013/07/01 04:11 PM
                  What about integer SIMD?EduardoS2013/07/01 06:04 PM
                    What about integer SIMD?Michael S2013/07/02 12:32 AM
          What about integer SIMD?hi2013/07/01 08:15 AM
            What about integer SIMD?Exophase2013/07/01 10:50 AM
            What about integer SIMD?David Kanter2013/07/02 01:20 PM
              What about integer SIMD?hi2013/07/02 03:48 PM
                What about integer SIMD?David Kanter2013/07/04 03:19 PM
  Silvermont architecture in-depth articleSebastian Soeiro2013/07/30 09:34 AM
    TLBs are caches of page tablesPaul A. Clayton2013/07/30 11:03 AM
      TLBs are caches of page tablesSebastian Soeiro2013/07/30 01:18 PM
        TLBs are caches of page tablesPaul A. Clayton2013/07/30 03:59 PM
          TLBs are caches of page tablesSebastian Soeiro2013/07/30 05:27 PM
            TLBs are caches of page tablesrwessel2013/07/30 07:01 PM
              TLBs are caches of page tablesSebastian Soeiro2013/07/31 02:15 PM
                Floorplan images show physical locationsPaul A. Clayton2013/07/31 04:11 PM
                  Floorplan images show physical locationsSebastian Soeiro2013/07/31 09:12 PM
                    Floorplan images show physical locationsrwessel2013/08/01 12:21 AM
                      Floorplan images show physical locationsSebastian Soeiro2013/08/02 12:58 PM
                        Floorplan images show physical locationsAntti-Ville Tuunainen2013/08/02 02:09 PM
                        Floorplan images show physical locationsStubabe2013/08/02 07:49 PM
                          Floorplan images show physical locationsSebastian Soeiro2013/08/03 08:23 AM
                            Floorplan images show physical locationsrwessel2013/08/03 11:16 PM
                            Floorplan images show physical locationsMelody Speer2013/08/04 04:11 AM
                              Floorplan images show physical locationsSebastian Soeiro2013/08/04 05:42 PM
                                Floorplan images show physical locationsrwessel2013/08/04 10:58 PM
                                  Floorplan images show physical locationsSebastian Soeiro2013/08/07 03:33 PM
                                    Floorplan images show physical locationsrwessel2013/08/08 01:03 PM
                                      Floorplan images show physical locationsSebastian Soeiro2013/08/11 09:20 AM
                                        Page tables are set up by the OSPaul A. Clayton2013/08/11 01:25 PM
                                          Page tables are set up by the OSSebastian Soeiro2013/08/16 08:43 PM
                                            Multilevel page table formatPaul A. Clayton2013/08/17 11:18 AM
                                              Multilevel page table formatSebastian Soeiro2013/08/19 03:28 PM
                                                Multilevel page table formatrwessel2013/08/20 12:08 AM
                                                  Multilevel page table formatSebastian Soeiro2013/08/22 04:52 PM
                                                    Multilevel page table formatTREZA2013/08/22 05:30 PM
                                                    Multilevel page table formatrwessel2013/08/23 10:58 PM
                                                      Multilevel page table formatSebastian Soeiro2013/08/25 08:20 AM
                TLBs are caches of page tablesrwessel2013/08/01 12:41 AM
                  TLBs are caches of page tablesSebastian Soeiro2013/08/02 12:51 PM
                    TLBs are caches of page tablesrwessel2013/08/02 06:55 PM
  Silvermont instruction schedulingHugo Décharnes2013/10/02 03:25 AM
    Silvermont instruction schedulingMichael S2013/10/02 04:29 AM
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