On Mon, 3 Dec 2007 21:57:27 +0000, Alan Cox <[email protected]> wrote:
> > You could write an equally effcient kernel in languages like C++,
> > using C++ abstractions as a high level organization, where
>
> It's very very hard to generate good C code because of the numerous ways
> objects get temporarily created, and the week aliasing rules (as with C).
>
That is what I like of C++, with good placement of high level features
like const's and & (references) one can gain fine control over what
gets copied or not.
Try to write a Vector class that does ops with SSE without storing
temporals on the stack. Its a good example of how one can get low
level control, and gcc is pretty good simplifying things like u=v+2*w
and not putting anything on the stack, all in xmm registers.
The advantage is you onle has to be careful one time, when you write
the class.
> There are reasons that Fortran lives on (and no I'm not suggesting one
> should rewrite the kernel in Fortran ;)) and the fact its not really got
> pointer aliasing or "address of" operators and all the resulting
> optimsation problems is one of the big ones.
>
--
J.A. Magallon <jamagallon()ono!com> \ Software is like sex:
\ It's better when it's free
Mandriva Linux release 2008.1 (Cooker) for i586
Linux 2.6.23-jam03 (gcc 4.2.2 (4.2.2-1mdv2008.1)) SMP Sat Nov
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
