gcc power optimization

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  • AJ
    #1

    gcc power optimization

    Hi,

    I am trying to optimize gcc for power consumption. Technique I am
    using is rescheduling instruction based on hamming distance between
    two consecutive instructions. Now I want to create a new pass after
    register allocation and final jump optimization. I am new to gcc
    development and am having trouble finding out how to create a new
    pass. Also I understand my scheduler will have to operate on RTL code.
    what would be the data structures I would need to create or which ones
    could be reused.

    How much code from schedule_insns( ) could be reused. I only need to
    change the cost model in it.

    Any kind of suggestion from you experts would be very beneficial for
    me.

    Alex
    Tags: None
    • Keith Thompson
      #2
      Re: gcc power optimization

      AJ <alex.xander99@ gmail.comwrites :
      I am trying to optimize gcc for power consumption. Technique I am
      using is rescheduling instruction based on hamming distance between
      two consecutive instructions. Now I want to create a new pass after
      register allocation and final jump optimization. I am new to gcc
      development and am having trouble finding out how to create a new
      pass. Also I understand my scheduler will have to operate on RTL code.
      what would be the data structures I would need to create or which ones
      could be reused.
      >
      How much code from schedule_insns( ) could be reused. I only need to
      change the cost model in it.
      >
      Any kind of suggestion from you experts would be very beneficial for
      me.
      I'll have to take your word for it that this will optimize power
      consumption, but in any case your question isn't about the C
      programming language. comp.compilers is probably a better place to
      ask.

      --
      Keith Thompson (The_Other_Keit h) kst-u@mib.org <http://www.ghoti.net/~kst>
      Nokia
      "We must do something. This is something. Therefore, we must do this."
      -- Antony Jay and Jonathan Lynn, "Yes Minister"

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        • Flash Gordon
          #3
          Re: gcc power optimization

          Keith Thompson wrote, On 07/11/08 05:44:
          AJ <alex.xander99@ gmail.comwrites :
          >I am trying to optimize gcc for power consumption. Technique I am
          <snip>
          I'll have to take your word for it that this will optimize power
          consumption, but in any case your question isn't about the C
          programming language. comp.compilers is probably a better place to
          ask.
          I would suggest the gcc development mailing list might be better as some
          of the question is highly specific to gcc.

          Also from personal experience I would suggest that the OP start be
          looking at the design of the SW that will be built with gcc first. On
          one project by judicious changes I was able to end up with the processor
          spending a lot of time in its idle state not executing *any*
          instructions (just waiting for an interrupt) and this can save a lot of
          power. Such discussions, however, belong on comp.arch.embed ded not here.
          --
          Flash Gordon
          If spamming me sent it to smap@spam.cause way.com
          If emailing me use my reply-to address
          See the comp.lang.c Wiki hosted by me at http://clc-wiki.net/

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