Move elimination can be a µop fusion

Article: Intel's Haswell CPU Microarchitecture
By: EduardoS (no.delete@this.spam.com), November 15, 2012 6:21 am
Room: Moderated Discussions
anon (anon.delete@this.anon.com) on November 15, 2012 6:14 am wrote:
> Any port? Including Load/Store AGU?

"In theory", a possible way of executing them, I didn't had the manual at hand.

> And Intel manual says: Some micro-ops can execute to completion during rename and are removed
> from the pipeline at that point, effectively costing no execution bandwidth. These include:
> • Zero idioms (dependency breaking idioms)
> • NOP
> • VZEROUPPER
> • FXCHG

From Intel manual? Nice, no need to speculate.

Now I just wonder way mov elimination wasn't implemented earlier.
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          A pit there are only 17000 TLAs... (NT)EduardoS11/15/12 03:14 AM
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    Move elimination can be a µop fusionPaul A. Clayton11/14/12 06:41 AM
      That should be "mov R10 <- R9"! (NT)Paul A. Clayton11/14/12 06:43 AM
      Move elimination can be a µop fusionanon11/14/12 07:25 AM
        It does avoid the scheduler (NT)Paul A. Clayton11/14/12 08:47 AM
      Move elimination can be a µop fusionStubabe11/14/12 01:43 PM
        Move elimination can be a µop fusionanon11/14/12 09:33 PM
          Move elimination can be a µop fusionFelid11/15/12 12:49 AM
            Move elimination can be a µop fusionanon11/15/12 01:23 AM
              Move elimination can be a µop fusionStuart11/15/12 05:04 AM
                Move elimination can be a µop fusionStubabe11/15/12 05:14 AM
                  Move elimination can be a µop fusionanon11/15/12 05:48 AM
                    Move elimination can be a µop fusionEduardoS11/15/12 06:00 AM
                      Move elimination can be a µop fusionanon11/15/12 06:14 AM
                        Move elimination can be a µop fusionEduardoS11/15/12 06:21 AM
                          Move elimination can be a µop fusionanon11/15/12 06:31 AM
                    Move elimination can be a µop fusionStubabe11/15/12 11:38 AM
                      There can be only one dependencePaul A. Clayton11/15/12 12:50 PM
                    Move elimination can be a µop fusionFelid11/15/12 03:19 PM
                      Move elimination can be a µop fusionanon11/16/12 04:07 AM
                        Move elimination can be a µop fusionFelid11/16/12 07:43 PM
                  Move elimination can be a µop fusionFelid11/15/12 02:50 PM
                    Move elimination can be a µop fusionFelid11/15/12 03:03 PM
                      Correction!Felid11/19/12 01:23 AM
                    Thanks, I wasn't aware of the change in SB. Good to know... (NT)Stubabe11/15/12 03:43 PM
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              Move fusion assumes adjacencyFelid11/15/12 02:40 PM
        Move elimination can be a µop fusionPatrick Chase11/21/12 11:52 AM
          Move elimination can be a µop fusionPatrick Chase11/21/12 12:12 PM
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