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Re: [patch][rfc] How to handle static constructors on linux

From: Cary Coutant <ccoutant at google dot com>
To: Rafael Espíndola <rafael dot espindola at gmail dot com>
Cc: Chandler Carruth <chandlerc at google dot com>, Andrew Pinski <pinskia at gmail dot com>, llvm-commits <llvm-commits at cs dot uiuc dot edu>, GCC Mailing List <gcc at gcc dot gnu dot org>
Date: Mon, 18 Jun 2012 11:58:49 -0700
Subject: Re: [patch][rfc] How to handle static constructors on linux
References: <CAG3jReKO=xkbwa6di8ZJrKLngsB0psMpC-J8q2wgUXWVzAmSHw@mail.gmail.com> <CAG3jReJg1rwbtVNKh4M5OyjngTXRtc=FKm1bqZa8bqzw2f7Raw@mail.gmail.com> <CA+=Sn1nNDosvamjhF7pkc0aumSw02u8WvNo1U2jaaxtrTriL8w@mail.gmail.com> <CAG3jReJhJhWVrrt-snupXwub+DJu=GtwmN9NLHZ8hp4tsxM0_A@mail.gmail.com> <CAHACq4pQQsv42qOCH7yQO-sbL1bzQkR0+irHx8N=HP5bRhF6-w@mail.gmail.com> <CAGCO0Kj30MApubw6-7hCQatBxDvr9F66D8BCTc9WrH96g7HrNw@mail.gmail.com> <CAHACq4qdxONxgtYaiR4xr_Z+-A8CPOg6dVDqavORuE+UpQNiCA@mail.gmail.com> <CAG3jReLpQs8FdGpbpixDXpRRO+4k2N9FUF6KCv+0a8qaGcPJog@mail.gmail.com>

> But I am still missing something, why is the performance so different?
> Code layout putting the constructors' body in the reverse order they
> are called?

Yes, as I understand it. Cache and TLB prefetching works better when
code executes from lower to higher addresses than when executing from
higher to lower.

-cary

References:
- Re: [patch][rfc] How to handle static constructors on linux
  - From: Rafael EspÃndola
- Re: [patch][rfc] How to handle static constructors on linux
  - From: Andrew Pinski
- Re: [patch][rfc] How to handle static constructors on linux
  - From: Rafael EspÃndola
- Re: [patch][rfc] How to handle static constructors on linux
  - From: Cary Coutant
- Re: [patch][rfc] How to handle static constructors on linux
  - From: Chandler Carruth
- Re: [patch][rfc] How to handle static constructors on linux
  - From: Cary Coutant
- Re: [patch][rfc] How to handle static constructors on linux
  - From: Rafael EspÃndola

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