and-compare and or-compare

Article: Microservers must Specialize to Survive
By: Paul A. Clayton (paaronclayton.delete@this.gmail.com), February 17, 2013 4:28 pm
Room: Moderated Discussions
Wilco (Wilco.Dijkstra.delete@this.ntlworld.com) on February 17, 2013 12:30 pm wrote:
[snip]
> No, it can't ever be faster. You need 4 instructions whether you expand the sequence using logical operations
> and a branch, 2 compares and branches or 2 compares with a condition combine instruction and a branch.
>
> However conditional execution needs 2 or 3 instructions for this, and combined
> compare+branch needs just 2 so those are the fastest ways on in-order CPUs.

Itanium-style compare and OR or AND with a CC could bring the CC version to three instructions--and would not need a second CC register. (For boolean conditions, such can allow removal of the comparison instruction when the earlier condition prevents the ORed or ANDed comparison from influencing the result--not that such a hardware optimization would necessarily be worthwhile!)

I find multiple condition registers attractive partially because such can be less expensive front-end registers (future file for an OoO implementation) allowing early branch resolution. In theory, branches whose conditions are set early could be resolved just after branch prediction (the predictor could indicate that the branch is a candidate for early resolution and what condition register+condition is tested), but even just after decode branch resolution could have some benefits.

Admittedly, the scope for potential improvement (conditions that can be set early) is very limited and lack of compiler support is probably a significant issue (in some cases, early setting would require interprocedural optimization). The scope is perhaps slightly larger than one might expect, however, since after a branch misprediction the current at time of mispredicted branch values are likely to be in the front end by decode time for the redirected instruction stream.

In addition, the benefit of early resolution over correct branch prediction may be small and many branches that can be resolved early may be highly predictable. (Accurate estimates of prediction confidence would further reduce the benefit of early resolution. A high confidence branch could use low-performance misprediction recovery [e.g., releasing ROB entries and requiring re-execution]; a low confidence branch might use predication or reduced priority [in a single-thread mode such might reduce power consumption at the cost of performance].)

This kind of optimization is what motivated Sheikh et al.'s "Control-Flow Decoupling" (MICRO 2012).

(Along similar lines, providing a few bits of information in the front end about a counter would allow early branch resolution [this would be a bit like the stack pointer optimization of recent x86], potentially resolving the branch before instruction fetch using a this-is-a-counted-inner-loop predictor with taken/not-taken/unknown state derived from the small front-end subset of the counter. This would require a way for the processor to determine that a value is a counter, but this need not actually be an architectural designation [though architecturally specifying a register--it need not be a special-purpose register as in Power and Itanium--would allow decrement-test-and-branch instructions].)

Multithreading may make early branch resolution more common (by reducing the effective pipeline delay between when a condition is generated and when it would be used in the front end) as well as less inferior to branch prediction in terms of delay (if prediction was four stages before resolution, it might appear as only two cycles with two-way multithreading).

I am not confident that multiple condition registers are the best design, but the trade-offs do not seem entirely clear.
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Article Online: Microservers must Specialize to SurviveDavid Kanter2013/01/28 12:47 PM
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            Or compare to *desktop* ASPsrwessel2013/01/30 03:07 PM
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              when thoughput matters, ultra-cheap Intel CPUs are not attractiveMichael S2013/01/31 01:59 AM
                when thoughput matters, ultra-cheap Intel CPUs are not attractiveDoug S2013/01/31 11:00 AM
                  when thoughput matters, ultra-cheap Intel CPUs are not attractiveMichael S2013/01/31 01:04 PM
                    Price/perf curve on intel.Jouni Osmala2013/01/31 10:28 PM
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                      when thoughput matters, ultra-cheap Intel CPUs are not attractiverwessel2013/02/02 12:54 AM
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    Article Online: Microservers must Specialize to SurviveDoug S2013/01/29 09:36 AM
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            Way and line locking and associativityMark Roulo2013/01/30 02:37 PM
        Cache capacity benefits may have been done in simulationPatrick Chase2013/01/30 06:25 PM
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      Article Online: Microservers must Specialize to Survivesoupdragon2013/01/31 11:02 AM
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  4x or 10x advantageS. Rao2013/01/30 04:35 PM
    4x or 10x advantagerwessel2013/01/30 05:32 PM
      4x or 10x advantageS. Rao2013/02/03 09:32 PM
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        4x or 10x advantagerwessel2013/02/03 11:08 PM
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            x86_64Michael S2013/02/05 01:51 AM
              x86_64Richard Cownie2013/02/05 03:33 AM
                x86_64EduardoS2013/02/05 03:41 AM
                  x86_64sJ2013/02/05 04:52 AM
                  x86_64Richard Cownie2013/02/05 05:47 AM
                x86_64someone2013/02/05 08:22 AM
                  x86_64Richard Cownie2013/02/05 08:44 AM
              "Just recompile"Mark Roulo2013/02/05 07:40 AM
                "Just recompile"Michael S2013/02/05 09:35 AM
                  "Just recompile"Mark Roulo2013/02/05 09:55 AM
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  x86 penalty depends on performance and microarchitecturePatrick Chase2013/02/01 09:11 PM
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          x86 penalty depends on performance and microarchitecturePatrick Chase2013/02/03 01:27 PM
            x86 penalty depends on performance and microarchitectureanon2013/02/03 01:58 PM
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                x86 penalty depends on performance and microarchitecturePatrick Chase2013/02/03 02:39 PM
                x86 penalty depends on performance and microarchitectureanon2013/02/03 05:08 PM
                  x86 penalty depends on performance and microarchitecturePatrick Chase2013/02/03 07:05 PM
                    x86 penalty depends on performance and microarchitectureanon2013/02/03 08:52 PM
                      x86 penalty depends on performance and microarchitectureDavid Kanter2013/02/03 10:23 PM
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                          U shape curve on performance...none2013/02/04 02:03 AM
                            U shape curve on performance...Michael S2013/02/04 06:55 AM
                              U shape curve on performance...Patrick Chase2013/02/04 09:14 AM
                                U shape curve on performance...Michael S2013/02/04 01:43 PM
                                  U shape curve on performance...Patrick Chase2013/02/04 03:06 PM
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                          U shape curve on performance...Michael S2013/02/04 06:48 AM
                          U shape curve on performance...Patrick Chase2013/02/04 09:05 AM
                            It only works if ... ??Paul A. Clayton2013/02/04 11:20 AM
                              It only works if ... ??Patrick Chase2013/02/04 11:48 AM
                                It only works if ... ??Patrick Chase2013/02/04 12:02 PM
                                It only works if ... ??Patrick Chase2013/02/04 12:08 PM
                                  It only works if ... ??Patrick Chase2013/02/04 12:15 PM
                                  It only works if ... ??anon2013/02/04 04:45 PM
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                      x86 penalty depends on performance and microarchitecturerwessel2013/02/03 11:28 PM
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              spec95 vs Spec2kPer Hesselgren2013/02/04 03:42 AM
              spec95 vs Spec2kbakaneko2013/02/04 03:48 AM
                correct linksMichael S2013/02/04 05:10 AM
              spec95 vs Spec2kPatrick Chase2013/02/04 10:47 AM
                spec95 vs Spec2kPatrick Chase2013/02/04 10:55 AM
                  spec95 vs Spec2kMichael S2013/02/04 12:39 PM
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                    spec95 vs Spec2knone2013/02/04 03:28 PM
                      spec95 vs Spec2kMichael S2013/02/05 01:35 AM
                spec95 vs Spec2kMichael S2013/02/04 12:50 PM
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        x86 penalty depends on performance and microarchitecturenone2013/02/02 09:43 AM
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                  Cortex A9 ROBnone2013/02/04 03:58 PM
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              Does AArch64 not support table node page sizes?Patrick Chase2013/02/03 09:14 PM
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              ARMv8 cleanlinessrwessel2013/02/03 11:37 PM
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              ARMv8 cleanlinessEtienne2013/02/04 07:01 AM
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                  Similar to Thumb If-Then instructionEtienne2013/02/05 06:22 AM
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                  ARMv8 cleanlinessEtienne2013/02/05 05:57 AM
                    ARMv8 cleanlinessJouni Osmala2013/02/05 06:59 AM
                      ARMv8 cleanlinessEtienne2013/02/05 07:55 AM
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                ARMv8 cleanlinessEtienne2013/02/14 05:00 AM
                  ARMv8 cleanlinessrwessel2013/02/14 03:03 PM
                ARMv8 cleanlinessSeni2013/02/14 06:45 AM
                  ARMv8 cleanlinessrwessel2013/02/14 03:14 PM
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                        ARMv8 cleanlinessEduardoS2013/02/15 09:45 AM
                        ARMv8 cleanlinessMax2013/02/15 12:24 PM
                          ARMv8 cleanlinessWilco2013/02/15 04:46 PM
                            ARMv8 cleanlinessLinus Torvalds2013/02/15 05:34 PM
                              ARMv8 cleanlinessWilco2013/02/17 12:47 PM
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                                      ARMv8 cleanlinessWilco2013/02/19 01:20 PM
                                    ARMv8 cleanlinessLinus Torvalds2013/02/19 09:13 AM
                                      ARMv8 cleanlinessWilco2013/02/19 01:10 PM
                                        ARMv8 cleanlinessLinus Torvalds2013/02/19 05:16 PM
                                          ARMv8 cleanlinessLinus Torvalds2013/02/19 05:41 PM
                                            ARMv8 cleanlinessWilco2013/02/25 05:05 AM
                                              ARMv8 cleanlinessLinus Torvalds2013/02/25 05:22 PM
                                                ARMv8 cleanlinessnone2013/02/26 12:31 AM
                                                  ARMv8 cleanlinessMichael S2013/02/26 04:05 AM
                                                ARMv8 cleanlinessDavid Hess2013/02/26 10:01 PM
                                                  ARMv8 cleanlinessLinus Torvalds2013/02/27 10:22 AM
                                                    ARMv8 cleanlinessDavid Hess2013/03/01 12:58 PM
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                                                        What is wrong with ARM?David Hess2013/03/01 06:49 PM
                                                          What is wrong with ARM?Michael S2013/03/02 04:11 PM
                                                            What is wrong with ARM?David Hess2013/03/03 10:32 PM
                                                              What is wrong with ARM?Michael S2013/03/04 01:05 AM
                                                        What is wrong with ARM?David Hess2013/03/07 05:30 PM
                                                          Thank you very much!Paul A. Clayton2013/03/07 06:59 PM
                                                            Thank you very much!David Hess2013/03/07 10:22 PM
                                                              Thank you very much!gallier22013/03/08 12:43 AM
                                                                Thank you very much!David Hess2013/03/08 10:24 AM
                                                                  Thank you very much!Ungo2013/03/08 03:37 PM
                                                                    Thank you very much!David Hess2013/03/08 07:47 PM
                                                            Thank you very much!Ricardo B2013/03/08 04:07 AM
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                                                                ARM lackings a historical accident?Ricardo B2013/03/08 02:33 PM
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                                                        ParityAndi Kleen2013/03/03 06:15 PM
                                            Except the borrow bitMatthew D2013/02/25 11:07 PM
                                              Except the borrow bitrwessel2013/02/25 11:42 PM
                                              Except the borrow bitLinus Torvalds2013/02/26 10:13 AM
                                                are ZSCO flags really fundamental?Michael S2013/02/27 03:24 PM
                                                  are ZSCO flags really fundamental?Linus Torvalds2013/02/27 04:41 PM
                                                    are ZSCO flags really fundamental?Michael S2013/02/28 12:39 AM
                                                    are ZSCO flags really fundamental?2013/03/01 09:23 AM
                                                  are ZSCO flags really fundamental?EduardoS2013/02/27 10:07 PM
                                                    are ZSCO flags really fundamental?Michael S2013/02/28 03:58 AM
                                                  are ZSCO flags really fundamental?rwessel2013/02/27 11:29 PM
                                                    are ZSCO flags really fundamental?rwessel2013/02/27 11:32 PM
                                                    Bit numbering on big endian machinesKonrad Schwarz2013/02/28 12:49 AM
                                                      Bit numbering on big endian machinesrwessel2013/02/28 01:32 AM
                                          ARMv8 cleanlinessWilco2013/02/25 04:54 AM
                                            ARMv8 cleanlinessEduardoS2013/02/25 05:24 AM
                                              ARMv8 cleanlinessWilco2013/02/25 06:36 AM
                                                ARMv8 cleanlinessEduardoS2013/02/25 12:06 PM
                                                  ARMv8 cleanlinessWilco2013/02/25 04:24 PM
                                                    ARMv8 cleanlinessEduardoS2013/02/25 04:55 PM
                                                    Utility of data loss exceptionsPaul A. Clayton2013/02/25 07:18 PM
                                                      Utility of data loss exceptionsrwessel2013/02/26 12:00 AM
                                                        Excessively expensive mode changingPaul A. Clayton2013/02/26 05:15 AM
                                                      Utility of data loss exceptionsEduardoS2013/02/26 01:55 AM
                                                        Utility of data loss exceptionsTREZA2013/02/26 03:53 AM
                                                          Utility of data loss exceptionsEduardoS2013/02/26 04:37 AM
                                                      Utility of data loss exceptionsEtienne2013/02/26 05:01 AM
                                            1b vs. 4b not a huge difference?Paul A. Clayton2013/02/25 08:57 AM
                                  Possible benefit of multi-bit CCPaul A. Clayton2013/02/23 07:09 AM
                                ARMv8 cleanlinessrwessel2013/02/17 11:01 PM
                                  ARMv8 cleanlinessWilco2013/02/18 04:33 PM
                                    ARMv8 cleanlinessEduardoS2013/02/18 07:18 PM
                                      ARMv8 cleanlinessWilco2013/02/25 05:19 AM
                      ARMv8 cleanlinessTREZA2013/02/15 03:21 AM
                      ARMv8 cleanliness2013/02/17 09:49 AM
                        ARMv8 cleanlinessLinus Torvalds2013/02/17 10:54 AM
                          ARMv8 cleanlinessLinus Torvalds2013/02/17 10:58 AM
                          ARMv8 cleanlinessnone2013/02/17 03:36 PM
                        ARMv8 cleanlinessTREZA2013/02/17 10:59 AM
                          ARMv8 cleanlinessWilco2013/02/17 11:30 AM
                            and-compare and or-comparePaul A. Clayton2013/02/17 04:28 PM
                              early branch resolutionanon2013/02/18 01:05 AM
                                My ignorance about compilers is vasterPaul A. Clayton2013/02/18 12:30 PM
                                early branch resolutionanon2013/02/18 04:12 PM
                              early branch resolution?EBFE2013/02/19 12:03 AM
                                Early resolution: some but limited potentialPaul A. Clayton2013/02/19 04:52 PM
                                  Early resolution: some but limited potentialhobold2013/02/20 01:02 PM
                                    PPC750 was an inspirationPaul A. Clayton2013/02/23 07:09 AM
                          ARMv8 cleanlinessTREZA2013/02/17 12:53 PM
                            ARMv8 cleanlinessExophase2013/02/17 03:49 PM
                        ARMv8 cleanlinessWilco2013/02/17 11:07 AM
                        ARMv8 cleanlinessbakaneko2013/02/17 11:43 AM
                        ARMv8 cleanlinessJouni Osmala2013/02/17 12:10 PM
                          -1 comparison true seems betterPaul A. Clayton2013/02/17 05:07 PM
                  ARMv8 cleanlinessEtienne2013/07/17 01:58 AM
      ARM server benchmark- why Apache?Per Hesselgren2013/02/04 11:13 PM
        ARM server benchmark- why Apache?anon2013/02/04 11:38 PM
          ARM server benchmark- why Apache?Per Hesselgren2013/02/05 12:25 AM
            ARM server benchmark- why Apache?Michael S2013/02/05 01:13 AM
          ARM server benchmark- why Apache?Michael S2013/02/05 12:51 AM
          I think that was debunked alreadyDavid Kanter2013/02/05 06:36 PM
        ARM server benchmark- why Apache?bakaneko2013/02/06 01:37 AM
          ARM server benchmark- why Apache?Michael S2013/02/06 02:43 AM
            Marketing to PHBs?Paul A. Clayton2013/02/06 05:40 AM
            ARM server benchmark- why Apache?bakaneko2013/02/06 06:08 AM
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