Pipelining affects the ISA

Article: PhysX87: Software Deficiency
By: Michael S (already5chosen.delete@this.yahoo.com), July 26, 2010 3:33 pm
Room: Moderated Discussions
IlleglWpns (asarpeshkar@gmail.com) on 7/26/10 wrote:
---------------------------
>I'm pretty sure every aggressive x86 microarchitecture is renaming flags. For example,
>K8 split it into four renamed registers (ZAPS) to account for partial flag updates:
>
>http://chip-architect.com/news/2003_09_21_Detailed_Architecture_of_AMDs_64bit_Core.html
>
>Given their performance, and the fact that most x86 instructions produce or consume
>flags, all the OOOE Intel architectures must be doing something similar.
>
>

AFAIR, Intel implementation is not quite as sophisticated as AMD's. They rename the whole ZAPSOC as a single unit, which leads to unresolved dependency between inc/dec and preceding arithmetic instruction. That's one of the reasons why except for arbitrary precision addition/subtraction loops inc/dec instructions are not recommended in Intel optimization manuals

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                                        Pipelining affects the ISA?2010/07/22 10:58 PM
                                          Pipelining affects the ISA?2010/07/22 11:14 PM
                                          Pipelining affects the ISArwessel2010/07/23 12:03 AM
                                            Pipelining affects the ISA?2010/07/23 05:50 AM
                                            Pipelining affects the ISA?2010/07/23 06:10 AM
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            You are just quoting SINGLE precision flops? OMG what planet do you live? Vincent Diepeveen2010/07/19 10:26 AM
              The prior poster was talking about SP (NT)David Kanter2010/07/19 11:34 AM
                All FFT's need double precisionVincent Diepeveen2010/07/19 02:02 PM
                  All FFT's need double precisionDavid Kanter2010/07/19 02:09 PM
                    All FFT's need double precisionVincent Diepeveen2010/07/19 04:06 PM
                  All FFT's need double precision - notMichael S2010/07/20 01:16 AM
                    All FFT's need double precision - notUngo2010/07/21 12:04 AM
                      All FFT's need double precision - notMichael S2010/07/21 02:35 PM
                      All FFT's need double precision - notEduardoS2010/07/21 02:52 PM
                        All FFT's need double precision - notAnon2010/07/21 05:23 PM
                          All FFT's need double precision - notRicardo B2010/07/26 07:46 AM
                        I'm on a boat!anon2010/07/22 11:42 AM
                        All FFT's need double precision - notVincent Diepeveen2010/07/24 11:39 PM
                          All FFT's need double precision - notslacker2010/07/25 03:27 AM
                            All FFT's need double precision - notRicardo B2010/07/26 07:40 AM
                          All FFT's need double precision - notEduardoS2010/07/25 08:37 AM
                            All FFT's need double precision - notMichael S2010/07/25 10:43 AM
                    All FFT's need double precision - notVincent Diepeveen2010/07/24 11:19 PM
      A bit off baseEduardoS2010/07/08 04:08 PM
        A bit off baseGroo2010/07/08 06:11 PM
          A bit off basejohn mann2010/07/08 06:58 PM
            All right...let's cool it...David Kanter2010/07/08 07:54 PM
    A bit off baseVincent Diepeveen2010/07/19 03:36 PM
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