AVX512 as co-processor

By: Michael S (already5chosen.delete@this.yahoo.com), August 29, 2021 3:13 am
Room: Moderated Discussions
Following AVX512-on-not-so-little-cores discussion in the thread below.
What if powerful, Saphire Rapids alike, AVX512 unit is attached to E-cluster as shared co-processor?

The main problem with such approach, the one that made similarly designed AMD Bulldozer a dog, is high latency of scalar and narrow ops. But, may be, it is possibly to process all scalar/128/256b operations locally and only 512bit ops ship to co-processor?
Of course, it's a big wastage of silicon, but nowadays it's not considered a serious disadvantage.
The bigger problem is if it's feasible from point of view of complexity of tracking of OoO resources which raises because architecturally scalar/128/265b registers are same as lower bits of 512b registers.
To me, as layman, the problem looks insurmountable, but I don't know even 1/100th of their tricks.
 Next Post in Thread >
TopicPosted ByDate
AVX512 as co-processorMichael S2021/08/29 03:13 AM
  AVX512 as co-processor-.-2021/08/29 04:05 AM
    Shared FPU wasn't BD's problemChester2021/08/30 01:03 PM
      Excellent post (NT)Heikki Kultala2021/08/30 01:34 PM
      Shared FPU wasn't BD's problemP Snip2021/08/30 01:53 PM
      Shared FPU wasn't BD's problem-.-2021/08/30 05:47 PM
      Shared FPU wasn't BD's problemDavid Kanter2021/08/30 10:29 PM
        Shared FPU wasn't BD's problemChester2021/08/31 02:58 AM
          Shared FPU wasn't BD's problemDavid Kanter2021/08/31 09:28 AM
            Shared FPU wasn't BD's problemChester2021/08/31 12:29 PM
            Shared FPU wasn't BD's problemRayla2021/08/31 02:34 PM
      Shared FPU wasn't BD's problemAnon2021/08/31 12:28 AM
        Shared FPU wasn't BD's problemAdrian2021/08/31 01:27 AM
          Shared FPU wasn't BD's problemAnon2021/08/31 02:06 AM
            Shared FPU wasn't BD's problemanonymou52021/08/31 02:09 PM
              Shared FPU wasn't BD's problemChester2021/09/01 11:05 AM
      Shared FPU wasn't BD's problemKevin G2021/08/31 09:39 AM
        Shared FPU wasn't BD's problemChester2021/09/01 10:03 AM
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