Cyclone Macro-op fusion

By: Maynard Handley (name99.delete@this.name99.org), July 5, 2015 5:01 pm
Room: Moderated Discussions
Some time ago we were wondering what macro-op fusion exists in Cyclone.
An interesting recent LLVM checkin answers the question to some extent.
http://reviews.llvm.org/D10746

Compare followed by branch is fused (no surprise).
Also in "Cyclone B0" (I'm assuming that means one of the two clusters. It could conceivably mean Typhoon, but you'd figure that would be "Cyclone B1" or "Cyclone B2" if it were anything) arithmetics followed by a CBZ, CBNZ are fused, so essentially the full arithmetic, test, jump in one go.

Interestingly I did not see any OTHER fusion possibilities in the code. In particular the possibility IBM selected (fusing instructions to create a large immediate) is not utilized, which might, of course reflect not enough time to add this to the design; but maybe also reflects something about ARM's constant generation and so a less frequent need for generating immediates through successive instructions.
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Cyclone Macro-op fusionMaynard Handley2015/07/05 05:01 PM
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                Benefit of dynamic hammock predicationPatrick Chase2015/07/07 09:49 AM
                  Benefit of dynamic hammock predicationSHK2015/07/07 10:34 AM
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                    Benefit of dynamic hammock predicationExophase2015/07/07 12:26 PM
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                    Benefit of dynamic hammock predicationPatrick Chase2015/07/07 01:32 PM
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                      Benefit of dynamic hammock predicationSylvain Collange2015/07/08 09:32 AM
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                          Prediction quality of A8 and Intel (was Benefit of dynamic hammock predication)David Kanter2015/07/09 06:20 AM
                            Prediction quality of A8 and Intel (was Benefit of dynamic hammock predication)Maynard Handley2015/07/09 09:04 AM
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                                Prediction quality of A8 and Intel (was Benefit of dynamic hammock predication)Patrick Chase2015/07/09 12:08 PM
                                  Prediction quality of A8 and Intel (was Benefit of dynamic hammock predication)Sylvain Collange2015/07/10 01:03 AM
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                            Prediction quality of A8 and Intel (was Benefit of dynamic hammock predication)Patrick Chase2015/07/09 11:44 AM
                          Prediction quality of A8 and Intel (was Benefit of dynamic hammock predication)Patrick Chase2015/07/09 08:43 AM
                          Prediction quality of A8 and Intel (was Benefit of dynamic hammock predication)someone2015/07/10 04:43 AM
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                      Example of memory ordering causing excitement in the real worlddmcq2015/07/09 03:37 AM
                        Example of memory ordering causing excitement in the real worldMark Roulo2015/07/09 07:24 AM
                          Example of memory ordering causing excitement in the real worlddmcq2015/07/09 09:09 AM
                          Example of memory ordering causing excitement in the real worldMaynard Handley2015/07/09 09:12 AM
                            Example of memory ordering causing excitement in the real worldLinus Torvalds2015/07/09 11:14 AM
                              Example of memory ordering causing excitement in the real worlddmcq2015/07/09 03:24 PM
                                Example of memory ordering causing excitement in the real worldSimon Farnsworth2015/07/10 12:07 PM
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                                        Example of memory ordering causing excitement in the real worldMichael S2015/07/13 04:19 AM
                                        Example of memory ordering causing excitement in the real worldSimon Farnsworth2015/07/14 12:21 PM
                                          Example of memory ordering causing excitement in the real worlddmcq2015/07/14 01:54 PM
                                            Example of memory ordering causing excitement in the real worldSimon Farnsworth2015/07/15 12:13 PM
                                              Example of memory ordering causing excitement in the real worlddmcq2015/07/15 02:43 PM
                                                Example of memory ordering causing excitement in the real worldSimon Farnsworth2015/07/16 11:41 AM
                                                  Example of memory ordering causing excitement in the real worldWilco2015/07/17 12:57 PM
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                                            Example of memory ordering causing excitement in the real worldSimon Farnsworth2015/07/16 12:05 PM
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                                  Example of memory ordering causing excitement in the real worldanon2015/07/12 02:42 AM
                                    Example of memory ordering causing excitement in the real worlddmcq2015/07/12 09:27 AM
                                    Example of memory ordering causing excitement in the real worldLinus Torvalds2015/07/12 10:24 AM
                                      Example of memory ordering causing excitement in the real worldEduardoS2015/07/12 10:53 AM
                                        Example of memory ordering causing excitement in the real worldLinus Torvalds2015/07/12 12:07 PM
                                          Example of memory ordering causing excitement in the real worldanon2015/07/12 06:52 PM
                                            Example of memory ordering causing excitement in the real worldLinus Torvalds2015/07/13 10:05 AM
                                              Example of memory ordering causing excitement in the real worlddmcq2015/07/13 11:20 AM
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                                                    Example of memory ordering causing excitement in the real worldanon2015/07/13 07:51 PM
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                                                      David's Paul A. Clayton2015/07/14 08:37 AM
                                                      David's 2015-07-12 10:34 post confirmed some of that (NT)Paul A. Clayton2015/07/14 08:39 AM
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                                                  Example of memory ordering causing excitement in the real worlddmcq2015/07/13 01:14 PM
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                                                Example of memory ordering causing excitement in the real worldsylt2015/07/13 01:19 PM
                                                  Example of memory ordering causing excitement in the real worlddmcq2015/07/13 02:24 PM
                                                    Example of memory ordering causing excitement in the real worldEduardoS2015/07/13 03:48 PM
                                                      Example of memory ordering causing excitement in the real worldMaynard Handley2015/07/13 06:18 PM
                                                        Example of memory ordering causing excitement in the real worldEduardoS2015/07/13 06:57 PM
                                                      Example of memory ordering causing excitement in the real worldanon2015/07/13 08:01 PM
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                                                      What high level languages do you have in mind?dmcq2015/07/14 05:54 AM
                                                  Example of memory ordering causing excitement in the real worldWilco2015/07/13 03:36 PM
                                                    Example of memory ordering causing excitement in the real worldEduardoS2015/07/13 03:56 PM
                                                      Example of memory ordering causing excitement in the real worldanon2015/07/13 05:43 PM
                                                        Example of memory ordering causing excitement in the real worldEduardoS2015/07/13 07:11 PM
                                                          Example of memory ordering causing excitement in the real worldanon2015/07/13 08:07 PM
                                      Example of memory ordering causing excitement in the real worldMaynard Handley2015/07/12 11:32 AM
                                        Example of memory ordering causing excitement in the real worldEduardoS2015/07/12 12:35 PM
                                        Example of memory ordering causing excitement in the real worldLinus Torvalds2015/07/12 12:38 PM
                                          Example of memory ordering causing excitement in the real worldEduardoS2015/07/12 05:47 PM
                                            Example of memory ordering causing excitement in the real worldNoSpammer2015/07/13 11:34 AM
                                              Example of memory ordering causing excitement in the real worldWilco2015/07/13 03:50 PM
                                                Example of memory ordering causing excitement in the real worldNoSpammer2015/07/14 01:02 PM
                                                  Example of memory ordering causing excitement in the real worldanon2015/07/14 08:37 PM
                                                    Example of memory ordering causing excitement in the real worldMichael S2015/07/15 12:19 AM
                                                      Example of memory ordering causing excitement in the real worldanon2015/07/15 01:26 AM
                                                        Example of memory ordering causing excitement in the real worldNoSpammer2015/07/15 06:05 AM
                                                          Example of memory ordering causing excitement in the real worlddmcq2015/07/15 07:04 AM
                                                            Example of memory ordering causing excitement in the real worldMichael S2015/07/15 07:29 AM
                                                              Example of memory ordering causing excitement in the real worlddmcq2015/07/15 09:09 AM
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                                                                Can string ops use microarchitectural state?rwessel2015/07/16 12:00 PM
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                                                                    Can string ops use microarchitectural state?rwessel2015/07/16 08:34 PM
                                                                      Can string ops use microarchitectural state?Michael S2015/07/17 04:39 AM
                                                                        Can string ops use microarchitectural state?rwessel2015/07/17 08:02 AM
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                                                                  Consider interrupt followed by task preemptionPaul A. Clayton2015/07/16 05:23 PM
                                                            Example of memory ordering causing excitement in the real worldNoSpammer2015/07/15 11:50 AM
                                                              Example of memory ordering causing excitement in the real worldLinus Torvalds2015/07/15 01:27 PM
                                                                Example of memory ordering causing excitement in the real worldNoSpammer2015/07/15 02:14 PM
                                                                  Example of memory ordering causing excitement in the real worldLinus Torvalds2015/07/15 04:42 PM
                                                      Example of memory ordering causing excitement in the real worldNoSpammer2015/07/15 01:44 AM
                                                    Example of memory ordering causing excitement in the real worldLinus Torvalds2015/07/15 01:17 PM
                                                      Example of memory ordering causing excitement in the real worldWilco2015/07/15 01:43 PM
                                                        Example of memory ordering causing excitement in the real worldanon2015/07/15 04:45 PM
                                                        Example of memory ordering causing excitement in the real worldLinus Torvalds2015/07/15 05:35 PM
                                                          Example of memory ordering causing excitement in the real worlddmcq2015/07/16 01:46 AM
                                                            Example of memory ordering causing excitement in the real worlddmcq2015/07/16 01:49 AM
                                        Example of memory ordering causing excitement in the real worldKonrad Schwarz2015/07/21 06:15 AM
                                      Example of memory ordering causing excitement in the real worldanon2015/07/12 06:42 PM
                                        Example of memory ordering causing excitement in the real worldanon2015/07/12 08:48 PM
                                        Example of memory ordering causing excitement in the real worldDavid Kanter2015/07/12 09:34 PM
                                          Example of memory ordering causing excitement in the real worldMichael S2015/07/13 12:51 AM
                                            Example of memory ordering causing excitement in the real worldDavid Kanter2015/07/13 07:31 AM
                                          Example of memory ordering causing excitement in the real worldanon2015/07/13 05:05 AM
                                            Example of memory ordering causing excitement in the real worldGabriele Svelto2015/07/17 04:40 AM
                                          Example of memory ordering causing excitement in the real worlddmcq2015/07/13 07:09 AM
                                        Example of memory ordering causing excitement in the real worldanon2015/07/13 06:46 AM
                                          Example of memory ordering causing excitement in the real worldanon2015/07/14 03:12 AM
                                        Example of memory ordering causing excitement in the real worlddmcq2015/07/15 02:51 AM
                                          Example of memory ordering causing excitement in the real worldanon2015/07/15 03:38 AM
                                            Example of memory ordering causing excitement in the real worlddmcq2015/07/15 05:21 AM
                                      Store queues in POWER/PowerPC processorsGabriele Svelto2015/07/16 12:55 AM
                                        Not sure about that conclusionDavid Kanter2015/07/16 06:34 AM
                                          The POWER4 had the same structureGabriele Svelto2015/07/17 04:20 AM
                                        Committing stores in program orderPaul A. Clayton2015/07/16 12:35 PM
                                          Committing stores in program orderMaynard Handley2015/07/17 11:52 AM
                                      Example of memory ordering causing excitement in the real worldKonrad Schwarz2015/07/20 03:44 AM
                                        Example of memory ordering causing excitement in the real worldanon2015/07/20 06:29 AM
                                          Example of memory ordering causing excitement in the real worldKonrad Schwarz2015/07/20 11:08 PM
                                            Example of memory ordering causing excitement in the real worlddmcq2015/07/21 12:27 AM
                                            Example of memory ordering causing excitement in the real worldMichael S2015/07/21 02:11 AM
                                              Example of memory ordering causing excitement in the real worldKonrad Schwarz2015/07/21 04:24 AM
                                            Example of memory ordering causing excitement in the real worldanon2015/07/21 05:22 AM
                                              Example of memory ordering causing excitement in the real worldKonrad Schwarz2015/07/21 06:36 AM
                                                Example of memory ordering causing excitement in the real worldanon2015/07/21 07:25 AM
                                              Example of memory ordering causing excitement in the real worldanon2015/07/21 07:17 AM
                                                Example of memory ordering causing excitement in the real worldanon2015/07/21 08:50 AM
                                                Example of memory ordering causing excitement in the real worldGabriele Svelto2015/07/21 11:46 AM
                                                Example of memory ordering causing excitement in the real worldKonrad Schwarz2015/07/21 11:35 PM
                                                  Example of memory ordering causing excitement in the real worldKonrad Schwarz2015/07/22 12:37 AM
                                                  Example of memory ordering causing excitement in the real worldanon2015/07/23 02:17 AM
                                                    Example of memory ordering causing excitement in the real worldKonrad Schwarz2015/07/23 03:59 AM
                                                      Example of memory ordering causing excitement in the real worldMichael S2015/07/23 06:31 AM
                                                        Example of memory ordering causing excitement in the real worldKonrad Schwarz2015/07/23 02:38 PM
                                                          Example of memory ordering causing excitement in the real worldKonrad Schwarz2015/07/23 10:44 PM
                                                            Example of memory ordering causing excitement in the real worlddmcq2015/07/24 12:08 AM
                                    Example of memory ordering causing excitement in the real worlddmcq2015/07/13 06:27 AM
                          Example of memory ordering causing excitement in the real worldKonrad Schwarz2015/07/16 04:11 AM
                      Example of memory ordering causing excitement in the real worldAnonymousse2015/07/16 04:07 AM
          Benefit of dynamic hammock predicationsomeotherdude2015/07/06 04:12 PM
            Benefit of dynamic hammock predicationMichael S2015/07/07 12:19 AM
          Benefit of dynamic hammock predicationPatrick Chase2015/07/06 09:20 PM
            SIMD predication is also helpful, of course (NT)Paul A. Clayton2015/07/07 06:45 AM
        Power8 branch conversionGabriele Svelto2015/07/07 01:50 AM
          isel works for storesPaul A. Clayton2015/07/07 06:43 AM
            isel works for storesPatrick Chase2015/07/07 10:08 AM
            isel DOES NOT work for storessomeotherdude2015/07/07 03:01 PM
              isel DOES NOT work for storesWilco2015/07/07 03:40 PM
              Yes it doesPatrick Chase2015/07/07 10:14 PM
                Yes it doesvvid2015/07/08 08:51 AM
            You don't need isel eitherGabriele Svelto2015/07/08 01:01 AM
              You don't need isel eitherPaul A. Clayton2015/07/08 03:46 AM
                You don't need isel eitherGabriele Svelto2015/07/08 04:22 AM
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