There can be only one dependence

Article: Intel's Haswell CPU Microarchitecture
By: Paul A. Clayton (paaronclayton.delete@this.gmail.com), November 15, 2012 12:50 pm
Room: Moderated Discussions
Stubabe (nospam.delete@this.nospam.com) on November 15, 2012 11:38 am wrote:
[snip]
> I'm sorry, but the uop fusion thing looks messy for
> the hardware to track to me, especially if multiple dependencies are present.

The µop fusion form of move elimination is for a move whose sole consumer is the next instruction, which uses the same destination register name (i.e., a move that is use to emulate an instruction with a destination distinct from its source operands--a significant fraction of moves are for this purpose). This means that only one µop needs to be handled by the renamer. This might expand the size of µops between the decode and renamer.

Renamer-based move elimination is more flexible, of course, and could be used in addition to or instead of µop fusion.

< Previous Post in ThreadNext Post in Thread >
TopicPosted ByDate
Haswell CPU article onlineDavid Kanter2012/11/13 03:43 PM
  Haswell CPU article onlineEric2012/11/13 04:10 PM
    Haswell CPU article onlinehobold2012/11/13 05:13 PM
      Haswell CPU article onlineRicardo B2012/11/13 06:09 PM
    Haswell CPU article onlineanonymou52012/11/13 05:44 PM
      Haswell CPU article onlinenone2012/11/14 03:40 AM
  Haswell CPU article onlinetarlinian2012/11/13 04:56 PM
    Fixed (NT)David Kanter2012/11/13 06:06 PM
      Haswell CPU article onlineJacob Marley2012/11/14 02:18 AM
  Haswell CPU article onlinerandomshinichi2012/11/14 02:53 AM
    LLC == Last Level Cache (usually L3) (NT)Paul A. Clayton2012/11/14 05:50 AM
    Haswell CPU article onlineJoe2012/11/14 10:38 AM
      LLC vs. L3 vs. L4David Kanter2012/11/14 11:09 AM
        LLC vs. L3 vs. L4; LLC = Link Layer ControllerRay2012/11/14 10:08 PM
          A pit there are only 17000 TLAs... (NT)EduardoS2012/11/15 03:14 AM
  Haswell CPU article onlineanon2012/11/14 05:10 AM
    Move elimination can be a µop fusionPaul A. Clayton2012/11/14 06:41 AM
      That should be "mov R10 <- R9"! (NT)Paul A. Clayton2012/11/14 06:43 AM
      Move elimination can be a µop fusionanon2012/11/14 07:25 AM
        It does avoid the scheduler (NT)Paul A. Clayton2012/11/14 08:47 AM
      Move elimination can be a µop fusionStubabe2012/11/14 01:43 PM
        Move elimination can be a µop fusionanon2012/11/14 09:33 PM
          Move elimination can be a µop fusionFelid2012/11/15 12:49 AM
            Move elimination can be a µop fusionanon2012/11/15 01:23 AM
              Move elimination can be a µop fusionStuart2012/11/15 05:04 AM
                Move elimination can be a µop fusionStubabe2012/11/15 05:14 AM
                  Move elimination can be a µop fusionanon2012/11/15 05:48 AM
                    Move elimination can be a µop fusionEduardoS2012/11/15 06:00 AM
                      Move elimination can be a µop fusionanon2012/11/15 06:14 AM
                        Move elimination can be a µop fusionEduardoS2012/11/15 06:21 AM
                          Move elimination can be a µop fusionanon2012/11/15 06:31 AM
                    Move elimination can be a µop fusionStubabe2012/11/15 11:38 AM
                      There can be only one dependencePaul A. Clayton2012/11/15 12:50 PM
                    Move elimination can be a µop fusionFelid2012/11/15 03:19 PM
                      Move elimination can be a µop fusionanon2012/11/16 04:07 AM
                        Move elimination can be a µop fusionFelid2012/11/16 07:43 PM
                  Move elimination can be a µop fusionFelid2012/11/15 02:50 PM
                    Move elimination can be a µop fusionFelid2012/11/15 03:03 PM
                      Correction!Felid2012/11/19 01:23 AM
                    Thanks, I wasn't aware of the change in SB. Good to know... (NT)Stubabe2012/11/15 03:43 PM
            Move fusion assumes adjacencyPaul A. Clayton2012/11/15 07:15 AM
              Move fusion assumes adjacencyFelid2012/11/15 02:40 PM
        Move elimination can be a µop fusionPatrick Chase2012/11/21 11:52 AM
          Move elimination can be a µop fusionPatrick Chase2012/11/21 12:12 PM
    Haswell CPU article onlineRicardo B2012/11/14 09:12 AM
  Haswell CPU article onlinegmb2012/11/14 08:28 AM
  Haswell CPU article onlineFelid2012/11/14 11:58 PM
    Haswell CPU article onlineDavid Kanter2012/11/15 09:59 AM
      Haswell CPU article onlineFelid2012/11/15 02:15 PM
        Instruction queueDavid Kanter2012/11/16 12:23 PM
          Instruction queueFelid2012/11/16 01:05 PM
  128-bit division unit?Eric Bron2012/11/16 04:57 AM
    128-bit division unit?David Kanter2012/11/16 08:59 AM
      128-bit division unit?Eric Bron2012/11/16 09:47 AM
        128-bit division unit?Felid2012/11/16 12:46 PM
          128-bit division unit?Eric Bron2012/11/16 01:24 PM
            128-bit division unit?Felid2012/11/16 07:19 PM
              128-bit division unit?Eric Bron2012/11/18 08:41 AM
            128-bit division unit?Michael S2012/11/17 12:50 PM
              128-bit division unit?Felid2012/11/17 01:44 PM
                128-bit division unit?Michael S2012/11/17 02:45 PM
                  128-bit division unit?Felid2012/11/17 05:49 PM
                    128-bit division unit?Michael S2012/11/17 06:56 PM
              128-bit division unit?Eric Bron2012/11/18 08:35 AM
  Haswell CPU article onlineJim F2012/11/18 09:45 AM
    Haswell CPU article onlineGabriele Svelto2012/11/18 12:52 PM
  Probable bottleneckLaurent Birtz2012/11/23 01:45 PM
    Probable bottleneckEduardoS2012/11/23 01:58 PM
      Probable bottleneckLaurent Birtz2012/11/24 10:10 AM
    Probable bottleneckStubabe2012/11/25 03:08 AM
      Probable bottleneckEduardoS2012/11/25 08:15 AM
        Probable bottleneckStubabe2012/11/28 04:36 PM
          Urgh. Post got mangled by LESS THAN signStubabe2012/11/28 04:41 PM
          Probable bottleneckLaurent Birtz2012/11/29 08:34 AM
  Haswell CPU article onlineMr. Camel2012/11/28 03:47 PM
    Haswell CPU article onlineEduardoS2012/11/28 04:06 PM
      Haswell CPU article onlineMr. Camel2012/11/28 07:23 PM
        Haswell CPU article onlineEduardoS2012/11/28 07:27 PM
          Haswell CPU article onlineMr. Camel2012/12/12 01:39 PM
            Much faster iGPU clock ...Mark Roulo2012/12/12 03:53 PM
              Much faster iGPU clock ...Exophase2012/12/12 11:46 PM
                Much faster iGPU clock ... or not :-)Mark Roulo2012/12/13 09:11 AM
                  Much faster iGPU clock ... or not :-)EduardoS2012/12/13 10:38 PM
                    Much faster iGPU clock ... or not :-)Michael S2012/12/14 05:33 AM
                      Much faster iGPU clock ... or not :-)EduardoS2012/12/14 07:06 AM
                        Much faster iGPU clock ... or not :-)Doug S2012/12/14 12:13 PM
                          Much faster iGPU clock ... or not :-)EduardoS2012/12/14 12:43 PM
                  Much faster iGPU clock ... or not :-)Mr. Camel2012/12/14 10:50 AM
              Much faster iGPU clock ...Michael S2012/12/13 02:44 AM
                Much faster iGPU clock ...Mark Roulo2012/12/13 09:09 AM
  Haswell CPU article onlineYang2012/12/09 08:28 PM
    possible spam bot? (NT)I.S.T.2012/12/10 03:40 PM
  CPU Crystal Well behavior w/ eGPU?Robert Williams2013/04/17 02:16 PM
    CPU Crystal Well behavior w/ eGPU?Nicolas Capens2013/04/17 03:30 PM
      CPU Crystal Well behavior w/ eGPU?RecessionCone2013/04/17 04:20 PM
        CPU Crystal Well behavior w/ eGPU?Robert Williams2013/04/17 07:37 PM
    CPU Crystal Well behavior w/ eGPU?Eric Bron2013/04/17 09:10 PM
  Haswell CPU article onlineSireesh2014/09/01 02:48 PM
    Haswell CPU article onlineMaynard Handley2014/09/01 03:51 PM
      Great postDavid Kanter2014/09/01 07:12 PM
      Thanks :)Alberto2014/09/02 01:42 AM
      Thanks (NT)Poindexter2014/09/02 09:31 AM
    Haswell CPU article onlineEduardoS2014/09/01 04:21 PM
  Haswell CPU article onlineAlbert2015/10/06 01:48 AM
    Haswell CPU article onlineMichael S2015/10/06 02:10 AM
    Haswell CPU article onlineSHK2015/10/06 03:51 AM
Reply to this Topic
Name:
Email:
Topic:
Body: No Text
How do you spell green?