AVX and 128-bit FPUs in Zen(Re:Some 'reverse-engineering' of Zen)

By: Heikki Kultala (hkultala.delete@this.iki.fi), October 30, 2015 3:45 pm
Room: Moderated Discussions

> The fact AMD Zen provides 256-bit AVX compatibility via fusing 2x 128bit units
> shows that they consider 256-bit software is relevant enough to be supported.

AVX has been out for about 5.5 years when Zen will be released and was supported by many earlier AMD processors. They just have to support AVX.

> The real reason why AMD Zen is stuck with 128bit units can be cache/memory bottlenecks or Skybridge
> (pin and inside compatibility of both K12 and Zen) or simply saving die space or .

The width of the FPU's has nothing to do with the external pins of the processor. There are zillion different-width buses between them.

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Some 'reverse-engineering' of Zenjuanrga2015/10/03 04:48 AM
  Some 'reverse-engineering' of ZenHeikki Kultala2015/10/03 08:01 AM
    Some 'reverse-engineering' of Zenitsmydamnation2015/10/03 03:47 PM
      Some 'reverse-engineering' of ZenAnders2015/10/03 11:04 PM
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          Some 'reverse-engineering' of ZenJukka Larja2015/10/05 09:15 AM
            Some 'reverse-engineering' of Zenmpx2015/10/05 09:37 AM
              Some 'reverse-engineering' of ZenContrarian2015/10/25 12:25 PM
                Some 'reverse-engineering' of Zenitsmydamnation2015/10/26 01:49 AM
                Some 'reverse-engineering' of Zenjuanrga2015/10/29 02:16 AM
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                    Some 'reverse-engineering' of Zenjuanrga2015/10/30 10:37 AM
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                    Some 'reverse-engineering' of Zenlurker2015/10/30 02:39 AM
                      Some 'reverse-engineering' of ZenGabriele Svelto2015/10/30 03:14 AM
                        Some 'reverse-engineering' of Zenlurker2015/10/30 03:41 AM
                      Some 'reverse-engineering' of Zendmcq2015/10/30 05:12 AM
                        Some 'reverse-engineering' of Zenlurker2015/10/30 05:56 AM
                          Some 'reverse-engineering' of Zendmcq2015/10/30 06:09 AM
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                          Some 'reverse-engineering' of ZenDavid Kanter2015/10/30 08:16 AM
                            Some 'reverse-engineering' of Zenlurker2015/10/30 08:44 AM
                          Some 'reverse-engineering' of Zenjuanrga2015/10/30 01:00 PM
                            AVX and 128-bit FPUs in Zen(Re:Some 'reverse-engineering' of Zen)Heikki Kultala2015/10/30 03:45 PM
                              AVX and 128-bit FPUs in Zen(Re:Some 'reverse-engineering' of Zen)juanrga2015/10/31 06:20 AM
                                AVX and 128-bit FPUs in Zen(Re:Some 'reverse-engineering' of Zen)Heikki Kultala2015/10/31 02:19 PM
                                  AVX and 128-bit FPUs in Zen(Re:Some 'reverse-engineering' of Zen)juanrga2015/11/01 07:41 AM
                                    AVX and 128-bit FPUs in Zen(Re:Some 'reverse-engineering' of Zen)Anne O. Nymous2015/11/01 09:39 AM
                                AVX and 128-bit FPUs in Zen(Re:Some 'reverse-engineering' of Zen)Matthias Waldhauer2015/11/02 01:26 PM
                                  AVX and 128-bit FPUs in Zen(Re:Some 'reverse-engineering' of Zen)juanrga2015/11/03 03:42 AM
                            Some 'reverse-engineering' of ZenMatthias Waldhauer2015/11/02 11:39 AM
                        Some 'reverse-engineering' of Zenbakaneko2015/10/31 07:28 AM
                          Some 'reverse-engineering' of Zendmcq2015/10/31 08:19 AM
                            Some 'reverse-engineering' of ZenJukka Larja2015/10/31 09:21 AM
                            Some 'reverse-engineering' of Zenbakaneko2015/10/31 10:23 AM
                              Some 'reverse-engineering' of Zendmcq2015/10/31 04:12 PM
                                Some 'reverse-engineering' of Zenbakaneko2015/10/31 05:25 PM
                                  Some 'reverse-engineering' of Zendmcq2015/11/01 07:36 AM
                                    Some 'reverse-engineering' of Zenbakaneko2015/11/01 10:11 AM
                                      Some 'reverse-engineering' of Zendmcq2015/11/01 10:27 AM
                                        Some 'reverse-engineering' of Zenbakaneko2015/11/01 03:35 PM
                                          Some 'reverse-engineering' of Zendmcq2015/11/01 04:52 PM
                                            Some 'reverse-engineering' of Zenbakaneko2015/11/03 03:17 AM
                                              Some 'reverse-engineering' of Zendmcq2015/11/03 04:17 AM
                  Some 'reverse-engineering' of Zenjuanrga2015/10/30 12:43 PM
                    Some 'reverse-engineering' of Zenlurker2015/10/30 02:09 PM
                      Some 'reverse-engineering' of Zenjuanrga2015/10/31 06:58 AM
                        Some 'reverse-engineering' of Zenlurker2015/10/31 08:07 AM
                          Some 'reverse-engineering' of Zenjuanrga2015/10/31 12:50 PM
                            Some 'reverse-engineering' of ZenPoindexter2015/10/31 02:47 PM
                              Some 'reverse-engineering' of Zenlurker2015/10/31 04:06 PM
                                Some 'reverse-engineering' of ZenPoindexter2015/10/31 05:37 PM
                                  Some 'reverse-engineering' of Zenlurker2015/11/01 03:46 AM
                                  Some 'reverse-engineering' of Zenjuanrga2015/11/01 08:16 AM
                                    Some 'reverse-engineering' of ZenMaynard Handley2015/11/01 06:33 PM
                                      Some 'reverse-engineering' of Zenjuanrga2015/11/02 05:06 AM
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                                      Some 'reverse-engineering' of ZenDavid Hess2015/11/02 07:16 AM
                                      Some 'reverse-engineering' of Zennobody2015/11/02 08:19 AM
                                        Some 'reverse-engineering' of ZenJukka Larja2015/11/02 09:34 PM
                                          Some 'reverse-engineering' of Zennobody2015/11/03 01:35 AM
                                            Some 'reverse-engineering' of ZenJukka Larja2015/11/03 02:41 AM
                                              Some 'reverse-engineering' of Zennobody2015/11/03 05:10 AM
                                                Some 'reverse-engineering' of ZenJukka Larja2015/11/04 02:52 AM
                                            Some 'reverse-engineering' of ZenKlimax2015/11/03 02:47 AM
                                              Some 'reverse-engineering' of Zennobody2015/11/03 04:19 AM
                                                Some 'reverse-engineering' of ZenKlimax2015/11/03 12:09 PM
                                          Some 'reverse-engineering' of ZenBanana_Comedown2015/11/04 11:17 AM
                                            Some 'reverse-engineering' of ZenJukka Larja2015/11/05 03:51 AM
                                              Some 'reverse-engineering' of ZenBanana_Comedown2015/11/05 01:23 PM
                                      Some 'reverse-engineering' of Zenjuanrga2015/11/03 04:13 AM
                                Some 'reverse-engineering' of Zennobody2015/10/31 08:16 PM
                                  Some 'reverse-engineering' of Zenlurker2015/11/01 03:48 AM
                                    Some 'reverse-engineering' of Zensylt2015/11/01 04:07 AM
                                    Some 'reverse-engineering' of Zennobody2015/11/01 11:49 AM
                                  Some 'reverse-engineering' of Zenmd2015/11/01 01:06 PM
                                    Some 'reverse-engineering' of Zenblu2015/11/01 01:59 PM
                                      Some 'reverse-engineering' of Zenjuanrga2015/11/02 05:10 AM
                              Some 'reverse-engineering' of Zenjuanrga2015/11/01 07:00 AM
                                Some 'reverse-engineering' of ZenPoindexter2015/11/01 09:25 AM
                                  Some 'reverse-engineering' of Zenjuanrga2015/11/02 04:47 AM
                                    Some 'reverse-engineering' of ZenPoindexter2015/11/02 05:39 AM
                                      Some 'reverse-engineering' of Zenjuanrga2015/11/02 01:26 PM
                                        Some 'reverse-engineering' of ZenDan Downs2015/11/02 03:12 PM
                                          Some 'reverse-engineering' of Zenjuanrga2015/11/03 03:51 AM
                            Some 'reverse-engineering' of Zenlurker2015/10/31 03:57 PM
                              Some 'reverse-engineering' of Zenjuanrga2015/11/01 07:26 AM
                                Some 'reverse-engineering' of ZenHeikki Kultala2015/11/01 09:57 AM
                                  Some 'reverse-engineering' of ZenMaynard Handley2015/11/01 06:39 PM
                              Some 'reverse-engineering' of ZenUngo2015/11/01 02:05 PM
                  Some 'reverse-engineering' of Zenquzhujian2015/10/31 10:39 AM
                  Some 'reverse-engineering' of ZenPoindexter2015/11/04 06:10 AM
                    Some 'reverse-engineering' of Zenlurker2015/11/05 01:54 PM
                      Some 'reverse-engineering' of Zennobody2015/11/05 03:28 PM
                      The sad status of tech mediajuanrga2015/11/06 05:19 AM
                        The sad status of tech mediaJoel2015/11/06 06:45 PM
                        The sad status of tech mediaMatthias Waldhauer2015/11/07 03:12 PM
                          The sad status of tech mediaJoel2015/11/07 05:40 PM
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