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Re: [PATCH GIT 0.6] make use of register variables & size_t

From
Arjan van de Ven <arjan@infradead.org>
Date
Apr 25, 2005, 20:50 UTC
Message-ID
<1114462210.8442.54.camel@laptopd505.fenrus.org>
In-Reply-To
<Pine.LNX.4.58.0504251147290.18901@ppc970.osdl.org>
On Mon, 2005-04-25 at 11:50 -0700, Linus Torvalds wrote:
Show 16 quoted lines
> 
> On Mon, 25 Apr 2005, Matthias-Christian Ott wrote:
> >
> > But this makes, like "register", direct use of processor registers (it
> > stores int arguments in eax, ebx, etc.).
> 
> No. It make _unlike_ "register", direct use of processor registers.
> 
> The "register" keyword does _not_ use processor registers. It's just 
> syntactic fluff, and tells the compiler exactly one thing:
> 
>  - that the compiler should warn if you take the address of such a thing.
> 
> In addition, the compiler may generate code that takes it into account, 
> which most likely means _worse_ code than if it didn't take it into 
> account.
afaik gcc just otherwise ignores it entirely.
Previous: Linus TorvaldsNext: valdis.kletnieks@vt.edu
Message 18 of 21 in “make use of register variables & size_t”
  1. make use of register variables & size_tMatthias-Christian Ott, Apr 25, 2005
  2. Rene RebeApr 25, 2005
  3. Matthias-Christian OttApr 25, 2005
  4. Matthias-Christian OttApr 25, 2005
  5. David A. WheelerApr 25, 2005
  6. Petr BaudisApr 25, 2005
  7. Pekka EnbergApr 25, 2005
  8. Linus TorvaldsApr 25, 2005
  9. Matthias-Christian OttApr 25, 2005
  10. Jan-Benedict GlawApr 25, 2005
  11. Thomas GlanzmannApr 25, 2005
  12. Jan-Benedict GlawApr 25, 2005
  13. Matthias-Christian OttApr 25, 2005
  14. valdis.kletnieks@vt.eduApr 25, 2005
  15. Linus TorvaldsApr 25, 2005
  16. Matthias-Christian OttApr 25, 2005
  17. Linus TorvaldsApr 25, 2005
  18. Arjan van de VenApr 25, 2005
  19. valdis.kletnieks@vt.eduApr 25, 2005
  20. Brian O'MahoneyApr 25, 2005
  21. Dmitry TorokhovApr 25, 2005

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